China Injection Mold Components Factory
Cores, cavities, inserts, sliders and lifters ground to 0.005mm and hardened to 48 to 54 HRC.
Send your 2D and 3D drawings and we make the custom cores, cavities, inserts, sliders, lifters and other mold components you need, whether you are building a new mold, repairing a running tool or replacing a worn part on the shop floor.
Before anything is cut we check your critical fits, mating surfaces, forming features, steel grade, hardness and surface requirements against the approved drawing, so the component is built around the job it does in your mold instead of being treated as a general machined part.
Tolerance
±0.005mm
Hardness
48 to 54 HRC
Quote
24 h
Everything You Need Before You Send The Drawing
Jump straight to what you are checking, from mating fits and steel selection to how we match a replacement core to a mold that is already in production.
Mold Components
Cores, cavities, inserts, sliders
02New And Replacement
New mold builds and spares
03Fit And Mating
Shut off, clearance, location
04Forming Surfaces
Cavity profile, draft, radii
05Slides And Lifters
Angles, travel, wear faces
06Steel And Heat Treatment
Grades, hardness, nitriding
07Machining And Finishing
CNC, wire EDM, grinding
08Cooling And Sealing
Water lines, O ring grooves
09Surface Finish
Polish grades and textures
10Replacement Components
Matching a mold already running
11Inspection
Dimensional and hardness reports
12Repeat Spare Parts
Reorder from stored records
13Factory Manufacturing
Machines and shop floor
14Case Studies
Components we have shipped
15RFQ Requirements
What to send for pricing
16FAQ
Lead time, MOQ, payment
17Send Mold Requirements
Drawings, steel, hardness
Injection Mold Components We Manufacture
From forming inserts to moving and wear components, we make custom mold parts from your 2D drawings and 3D models. Steel grade, hardness, critical tolerances, mating dimensions and surface requirements are produced to the approved specification, not to our own assumptions.
Core And Cavity Inserts
Precision machined inserts for the surfaces that form your part. Critical profiles, shutoff areas, parting surfaces and fitting dimensions are held to what your drawing calls out.
Mold Inserts
Inserts for local forming features, replaceable sections, ribs, bosses and other mold details. Built either for a new tool or as a drop in for a worn or damaged section.
Sliders
Slider components for side actions and undercut features. Sliding surfaces, shutoff geometry, wear areas and mating dimensions are matched to the mold structure you are running.
Lifters
Lifters and related components for internal undercuts and ejection movement. Angle, working surfaces, fit dimensions and contact areas follow the approved design.
Core Pins
Core pins for holes, bosses and internal features. Diameter, concentricity, working length, hardness and surface condition are set by the application you describe.
Ejector Related Components
Special ejector parts and non standard components used inside the ejection system, made to your drawing when the catalogue item does not fit the tool.
Wear Components
Replaceable parts for areas that see repeated sliding and contact. Material, hardness and fit are chosen against the component drawing and the way the tool actually runs.
Custom Mold Components
If the part does not sit in any standard category, send the drawing or 3D model. We review geometry, steel, tolerance, heat treatment and surface requirements before anything is cut.
New Mold Components Or Replacement Parts
Whether the part is for a mold you are building or a tool already in production, the manufacturing reference has to be clear before machining starts. What we need from you is different in each case.
Path A
Components For New Molds
For a new tooling project, manufacturing starts from your approved component drawing and 3D model. Before production we go through everything that defines the finished part.
What We Review First
Machining, heat treatment, finishing and inspection then all run against the same confirmed drawing revision, so nothing gets built to an older file.
Path B
Replacement Components
A replacement part has to fit the mold that is already in service. The more references you can send, the less guessing is left in the fit.
Useful References
Worth Checking Before You Copy A Part
The worn part in your hand is not always a safe manufacturing reference. Wear, polishing, an earlier repair or a mold modification may have moved its dimensions away from the original design, so we compare it against the drawing and the mating features before we cut a new one.
Do Not Copy Wear Into The New Part
If the component has already been repaired, polished or worn in production, copying every measured dimension can build the same problem straight back into your mold.
Where it matters, we look at the drawing, the current mold condition and the mating dimensions together before the replacement geometry is confirmed with you.
The Component Must Fit The Mold, Not Just The Drawing
Your components work as part of an assembled tool. A dimension can sit inside tolerance and the part can still give you trouble if the relationship with the pocket, parting surface, shutoff area or mating component is wrong. On critical parts we review the dimensions that control how the component fits and functions inside the mold.
Accuracy Where The Mold Needs It
Not every surface needs the same tolerance, and tightening all of them only adds cost to your part.
Critical fits and mating features get tighter control where the mold function calls for it, while non critical areas are held to the tolerance your drawing already specifies.
Forming Surfaces Define The Molded Part
The forming surface of a core, cavity or insert is what actually creates the geometry and surface condition of your molded part, so it gets different attention from a mounting or clearance face. Geometry, draft, small features, EDM condition and final finish are all controlled against your approved mold design.
Product Geometry
Critical contours, cavities, cores and local features have to match your 3D model and drawing definition, not an approximation of them.
On complex surfaces, machining and inspection run off the same datum and model reference, so the finished geometry stays consistent with the approved design.
Draft Surfaces
Draft controls both the molded geometry and how cleanly the part releases from your tool.
Direction and angle are held through CNC machining, EDM and polishing. Heavy manual finishing is where draft and edge relationships usually get lost, so those surfaces stay controlled.
Ribs, Bosses And Deep Features
Narrow ribs, deep cavities, small bosses and other restricted areas usually need CNC and EDM working together.
Depth, wall condition, corner geometry and the transition into the surrounding surface are all treated as part of the feature, not as leftovers.
Sharp Details And Small Features
Fine slots, small radii and narrow shutoff details are often hard to hold with standard milling alone.
The process gets selected around the geometry instead of pushing every area through the same machining method to keep the route simple.
EDM Areas
EDM comes in where milling access is limited or the mold feature is deep and complex.
Electrode geometry, EDM depth and the remaining surface condition follow the specified requirement, which matters most when the area will be polished or textured later.
Cosmetic Surfaces
Visible areas of your part need tighter control on the matching mold surface. Machining marks, EDM texture, polishing direction and local transitions all show up in the plastic.
If a surface needs polishing, mirror finish or later texturing, tell us before final machining so the route is planned for it.
Moving Components Must Fit And Move Correctly
Slides and lifters are not just precision machined parts. They have to run the required stroke, close against the right surfaces and return without interference inside your mold, so geometry, fit and contact relationships get controlled together.
Sliding Fit
Sliding surfaces need enough clearance to move reliably without leaving you with play in the tool.
The fit follows your mold design, working condition and lubrication arrangement, rather than one standard clearance applied to every slider we make.
Angle And Travel
Lifter angles, slider movement and working stroke decide whether the undercut releases the way your design intended.
Critical angles, travel related geometry and stop positions come straight from the approved mold data, so the component follows the movement path it was drawn for.
Shutoff Contact
Plenty of sliders and lifters also carry shutoff surfaces that have to close against the mating mold feature in the right position and geometry.
Poor contact here is what later shows up as flash, local wear or molded features that are not consistent from shot to shot.
Wear And Contact Surfaces
Sliding and contact areas take repeated movement on every cycle your mold runs.
Steel, hardness, surface condition and mating geometry are specified for the working area, so wear is controlled where the contact actually happens.
Clearance Around Moving Features
A moving component may pass close to inserts, cores, ejector features or surrounding mold steel on its way through the stroke.
Clearance gets checked across the complete movement path, not only in the fully open and fully closed positions where most drawings show it.
Motion Depends On More Than One Dimension
On slides and lifters, every dimension sitting inside tolerance is not the result you are actually paying for.
The component still has to fit the mating structure, follow the movement your design calls for and close against the correct surfaces once the tool is running.
Steel And Hardness Should Match The Mold Application
Steel is chosen around how the component works inside your mold, the resin you are running, the surface finish you need and the condition the tool operates in. On custom parts we manufacture to the grade, heat treatment and hardness your drawing or specification defines.
What Drives The Steel Decision
Surface Finish Requirements
Cores, cavities and inserts that form a visible surface need steel that polishes the way you expect it to.
If the part calls for mirror polishing, fine polishing or texturing later, the steel condition and heat treatment have to support that result. Deciding it after machining is where finish problems usually start.
Wear Conditions
Sliders, lifters, core pins and anything else that moves or meets abrasive compound needs more wear resistance than a static insert does.
That requirement belongs to the working surface. Pushing hardness up across the whole component without looking at function usually costs you toughness somewhere else.
Corrosion Resistance
Some tools sit in moisture, corrosive molding conditions or resins that attack the steel over a long run.
Where that applies, grade and heat treatment are specified for it, particularly on forming surfaces, around cooling areas and on tooling you expect to keep running for years.
Strength And Dimensional Stability
Hardness on its own does not tell you whether a component is suitable for the job.
The material and heat treatment also have to give enough strength and dimensional stability for the geometry, which is what decides the outcome on precision inserts, long core pins, thin sections and anything that gets ground or fitted after treatment.
Molded Material
What you are molding changes what the component needs. Glass filled and abrasive resins push wear on forming and moving surfaces much faster than unfilled material.
Other jobs shift the priority to corrosion resistance or surface quality instead, so the steel specification is looked at together with the resin, the mold function and the production condition you expect.
Heat Treatment Sits Inside The Machining Sequence
When heat treatment is required, it has to be coordinated with the machining order, because critical dimensions are only controlled after the processes that can still move them. Depending on the component and your drawing, the route runs like this.
Rough Machining
Bulk material removed before the part goes to treatment
Heat Treatment
Processed to the hardness your specification defines
Finishing Allowance
Stock left on critical faces for post treatment work
Final Grinding Or EDM
Critical geometry cut after the part is hardened
Hardness Verification
Checked against the specified range before release
Final Inspection
Dimensions confirmed after every process that moves them
Machining Each Feature With The Right Process
One mold component can carry complex 3D surfaces, deep cavities, precision slots, fitting faces and hardened dimensions on the same part. The process is picked around the feature being produced, the tolerance it needs and what that surface has to do in your mold.
CNC Milling
Milling handles the main component geometry, pockets, profiles, 3D surfaces and the mold features a cutter can reach cleanly.
Allowance and process order are planned around what comes next, so a part heading for heat treatment, EDM, grinding or final finishing is left with the stock those steps need.
EDM
EDM takes the features that milling either cannot reach or cannot hold efficiently, including deep cavities, narrow ribs, internal corners and complex forming details.
Electrode geometry and EDM depth are controlled against your approved 3D model and drawing, which also decides the surface condition left for polishing or texturing later.
Wire EDM
Wire EDM suits precision profiles, slots, openings and other through features where the geometry has to be accurate rather than approximately right.
It earns its place when profile accuracy, straightness or control of a narrow feature is what decides whether the finished component works in your tool.
Precision Grinding
Grinding comes in where flatness, thickness, squareness and fitting dimensions need tighter control than milling gives you.
Where it sits in the route depends on the material condition and the final dimension you need held.
Final Machining
Critical dimensions are finished after the processes most likely to move them, not before.
Depending on the component that last stage may be precision milling, EDM, grinding, fitting or whatever finishing your drawing specifies, and inspection follows it rather than sitting somewhere in the middle.
The Process Follows The Feature
A complex mold component is rarely finished on one machine. A typical route through our shop looks like this.
The exact sequence comes from your component geometry, steel condition, tolerance and surface requirements, so it is confirmed per part rather than fixed in advance.
Cooling And Sealing Features Must Match The Mold Design
Cooling holes, water channels and sealing features are part of how your mold works, not secondary machining details. Position, depth, intersection and sealing geometry follow the approved drawing so the component connects correctly with the cooling system and sealing arrangement already in the tool.
Cooling Hole Position
Cooling holes are located to the mold geometry your drawing defines, not to whatever is convenient on the machine.
Wrong position or depth changes the cooling layout you designed, and usually shows up as a problem when the component meets the surrounding plates and fittings during assembly.
Channel Intersections
Cross drilled channels need their depth and intersection controlled, because that is where a water path either forms correctly or opens somewhere it should not.
Hole direction, drilling depth and connection points are verified against the drawing before the part leaves the machine.
O Ring Grooves
Sealing grooves need the right diameter, width, depth and relationship to the mating surface to actually hold a seal.
They are machined to the specified seal design rather than cut as general grooves that happen to be close to the drawing size.
Sealing Surfaces
The surface around a cooling connection or O ring groove is part of the sealing system, even though it carries no feature of its own.
Flatness, surface condition and local geometry are held so the contact with the mating component is the one your design assumed.
Cooling Interfaces
Threaded ports, fittings, plugs and connecting holes have to line up with the mold structure around them.
Connection type, thread specification, location and depth get confirmed with you before machining, which matters most on a replacement part that has to match a tool already running.
Check The Complete Cooling Path
A single hole can measure correctly while the complete circuit is still wrong.
On components with internal cooling, hole position, depth, intersections, sealing areas and connection points get reviewed together before final inspection, not one feature at a time.
If you need pressure or leakage testing, define it in the drawing or project specification before production so it is priced and planned into the route.
Surface Finish Should Follow The Function Of Each Area
The surface condition of a mold component shows up in molded part appearance, fit, movement and sealing. So the requirement gets defined area by area, according to what that surface does, instead of running one finish across the whole part and paying for it everywhere.
01
Machined Finish
Where It AppliesNon cosmetic, non contact areas that can stay in the machined condition your drawing specifies.
Still ControlledTool marks, machining direction and final roughness follow the drawing wherever a surface requirement is called out.
02
EDM Finish
Where It AppliesEDM areas that either stay as machined or move on to further finishing, depending on what the surface does.
Confirm FirstOn forming areas the EDM condition is agreed before polishing or texturing, so stock removal later does not move the geometry you designed.
03
Ground Surfaces
Where It AppliesAreas where flatness, thickness, squareness or controlled contact decide whether the part fits your tool.
Typical AreasFitting faces, sliding areas, locating surfaces and other precision interfaces that carry a real mating relationship.
04
Polished Surfaces
Where It AppliesForming surfaces that need polishing to give you the molded appearance or the release condition the part depends on.
Scope ItPolish is called out only on the areas that need it, so critical edges, dimensions and transitions are not softened for no reason.
05
Mirror And Cosmetic Finishes
Where It AppliesHigh gloss molded surfaces, which need a finer mold finish than general functional areas.
What Supports ItSteel condition, earlier machining, EDM quality and polishing allowance all have to line up. Mirror finish is a route decision, not a last step.
06
Texture Preparation
Where It AppliesForming areas heading for texture treatment, where the incoming surface condition decides the texture result.
Prepared To SpecThe area is finished to your texture specification without removing critical geometry or changing local draft and edge relationships.
One Component Can Require Several Finishes
A single core, cavity or insert often carries all of these at once.
Mark them separately on the drawing or in the approved manufacturing information, and the finish gets priced and produced for each area instead of averaged across the part.
Replacement Parts Must Match The Existing Mold
A damaged or worn component should not be copied before someone checks the mold it has to go back into. Before we manufacture a replacement, we go through the available drawing, the current mold revision and the critical mating features to fix the right manufacturing reference.
Reference
Drawing First
Checked
Mating Features
Quote
24 h
Check The Current Revision
If the mold has been modified since it was built, the latest approved revision is the one we work from wherever it is available. An old file is the most common reason a new part does not drop in.
Review The Existing Component
The damaged part still tells us a lot, but wear, polishing and earlier repair may have moved its dimensions away from the design. We read it as evidence, not as the drawing.
Confirm Critical Mating Features
Pocket fit, parting surfaces, shutoff areas, locating features and the related interfaces are checked against the current condition of your mold rather than the original intent alone.
Match Surface And Functional Features
Cooling connections, sealing areas, polished surfaces and other functional details are built to what the tool in service actually needs, so the part works the day it goes in.
Replace The Component, Not The Wear
The target is a part that fits and functions in your existing mold, not a faithful copy of every dimension measured off the worn one.
Inspection Focused On Critical Mold Features
Checks come from your approved drawing and from what each component has to do inside the mold. Critical dimensions, mating features, forming geometry and the specified material condition are all verified before the part is released to you.
Forming Profiles
Core, cavity and insert profiles are checked against your drawing or 3D model wherever dimensional verification is required.
Complex geometry gets measured with equipment suited to the feature and the tolerance, rather than forcing every profile through the same check.
Fit And Mating Dimensions
The dimensions that decide how the component sits in your mold get the most attention, because these are what you feel during assembly.
Flatness And Squareness
Reference faces, fitting surfaces and ground areas are checked where flatness, parallelism or squareness changes how the part assembles.
These are the features that pass a caliper check and still cost you time on the bench, so they are verified in the condition you receive them.
Slides And Lifters
Critical slider and lifter features are checked on the dimensions that control fit, angle, contact surfaces and mating geometry.
Inspection follows the approved drawing instead of treating a moving component as an ordinary machined part with a few sizes to confirm.
Hardness
Where your specification calls out hardness, the finished component is tested according to the material and heat treatment requirement.
The verified result has to sit inside the approved range before the part moves on, and it can be recorded on the inspection report you receive.
Cooling And Sealing Features
Cooling hole locations, groove dimensions, connection features and sealing geometry are inspected wherever they are defined as critical.
If pressure or leakage testing belongs in the acceptance scope, tell us at quotation so it is planned into the route rather than added at the end.
Inspection Follows The Drawing
Not every dimension needs the same inspection method, and measuring everything the same way just moves cost around without protecting your tool.
Critical and functional features are identified from your approved drawing, so the effort sits on the dimensions that decide fit, movement, forming and assembly.
Repeat Spare Parts From Approved Component Data
Molds need the same inserts, core pins, lifters, sliders and wear components again through maintenance and long production runs. Once a component is approved, the manufacturing information stays tied to that part and revision, so the next set comes off the same reference instead of a fresh interpretation.
Reorder From
Stored Records
Revision
Controlled
Quote
24 h
Controlled Drawing Revision
Repeat parts are built from the approved revision, not an older file or an unverified copy that has been sitting on the shop floor.
Material And Heat Treatment
Steel grade, heat treatment and hardness stay in the component record, so the next batch follows the same material specification you already accepted.
Dimensions And Surface Requirements
Critical dimensions, fitting features, polishing requirements and the approved surface conditions are kept with the component specification.
Inspection Requirements
The same critical features are checked against the inspection requirements already established, so a repeat order is verified the way the first one was.
Reduce Rework On Future Spare Orders
When the approved component data stays controlled, your next spare part is reproduced from that reference instead of rebuilding the whole manufacturing basis from the beginning each time you need one.
Inside Our Injection Mold Components Factory
Machining, EDM, grinding, finishing and inspection all run in house, against your approved drawings and project requirements.
From a single insert or core pin to complex sliders, lifters, cores and cavity components, every part follows a defined manufacturing route before it reaches final inspection and release to you.
100%
Components inspected against the approved drawing
Want to see a specific process before you place the order? We send machining photos, in process images and inspection records on request.
Injection Mold Component Case Studies
Different components fail, fit and function in different ways. These projects show how drawing requirements, existing mold conditions, critical interfaces and inspection points get handled on both new builds and replacement work.
Replacement Cavity Insert
A production mold needed a new insert that would sit in the existing pocket, meet the parting surface and hold the defined forming geometry.
Replacement Slider
A slider had worn in production. The new one had to keep the specified sliding fit, shutoff geometry and its relationship with the mating mold features.
Custom Lifter Component
Built from the customer's mold data. It had to follow the specified angle and geometry while holding the required contact and fitting surfaces.
Precision Core Pins
Core pins for maintenance and spare part replacement, with diameter, working length, locating features and material condition all held to the drawing.
New Core And Cavity Inserts
Inserts for a new mold build, producing the forming geometry, fitting surfaces and specified finish from the approved 2D and 3D data.
Repeat Spare Components
Previously approved components made again for maintenance stock, keeping the same revision, steel specification, critical dimensions and inspection requirements.
What To Send For A Mold Component Quote
The clearer the manufacturing information, the better we can review the component before pricing it. For most parts, send the latest drawing or model together with the material, tolerance and surface requirements that define the finished component.
Send the newest drawing you have, showing the dimensions and requirements needed to actually make the part.
A model earns its keep on cores, cavities, inserts, sliders and anything else with complex forming geometry.
Check that the 3D file and the 2D drawing point at the same revision before you send them. A mismatch there is one of the most common reasons a quote has to go back for clarification.
Tell us which component you need, so we read the drawing the way the mold uses the part.
Confirm whether the component is for a new mold or one already in service.
On replacement work, the current mold condition and the mating features often matter more than the damaged component in your hand.
If something is still open, mark it as open. That is far better for you than leaving the manufacturing reference to interpretation.
Include the quantity you need and say whether it is initial manufacturing, maintenance stock or repeat spare part supply. That changes how we plan the route and how we price a follow up order.
The Minimum That Gets You A Real Quote
Everything else helps, but with these four we can review the component and come back to you properly.
File Formats We Read
Response Time
Quotes come back within 24 hours on business days, with any open point named rather than assumed.
The Existing Mold Is Part Of The Reference
On replacement components, the worn or damaged part is rarely enough on its own to build from.
What the existing mold tells us about dimensions and interfaces is often what confirms the ones your new component actually has to match.
Frequently Asked Questions
The questions buyers usually raise before sending a mold component drawing, answered the way we would answer them on a call.
01
Can you manufacture replacement components for an existing injection mold?
Yes. Replacement cores, cavity inserts, sliders, lifters, core pins and other custom components can be made from your available drawings, 3D data and existing mold information.
On replacement work the damaged part is not treated as the only reference. Wear, polishing, an earlier repair or a mold modification may have moved its dimensions, so critical mating features are reviewed against the mold before the manufacturing reference is confirmed with you.
02
What if the original component drawing is no longer available?
A missing drawing does not stop the job, but it does mean we need more from you.
Useful references include the existing component, the mating pocket, related mold parts, 3D mold data, previous revisions, measurement records and clear photos. We review what you have before telling you whether the component can be reconstructed accurately enough to manufacture.
03
Should I provide both a 2D drawing and a 3D model?
On components with complex forming geometry, both is better.
The 3D model carries the surfaces and geometry, while the 2D drawing usually carries tolerances, datums, steel, hardness, surface finish and the rest of the manufacturing requirements. Both files should represent the same approved revision.
04
How do you control insert to pocket fit?
Fit comes from the dimensions and datum relationships in your approved drawing.
On critical inserts, fitting dimensions, locating steps, shoulders and mating surfaces are handled as functional features rather than ordinary outside dimensions.
For a replacement, we may also need pocket or mating information if the mold has been repaired or modified since it was built.
05
What needs to be controlled on sliders and lifters?
More than individual dimensional tolerances.
The critical features are usually sliding fit, working angle, shutoff geometry, contact surfaces, locating features, travel related geometry and clearance to the surrounding components. Which ones matter most depends on how the part functions in your specific mold.
06
Can you work with different mold steels and hardness requirements?
Yes. Components are made to the steel grade, heat treatment and hardness your approved drawing specifies.
Selection should account for component function, molded resin, wear condition, corrosion resistance and the surface finish you need. We do not treat higher hardness as automatically better for every component, because it usually costs toughness somewhere.
07
Can forming surfaces be supplied polished or mirror finished?
Where it is specified, forming surfaces can be finished to the required polishing condition within our confirmed capability.
Mark the finish on the relevant surfaces, since one component often carries polished forming areas, ground fitting faces, EDM surfaces and machined clearance areas at the same time.
Mirror and cosmetic finishes should be defined before final processing, so the steel condition and the earlier machining support the result you want.
08
How are dimensions controlled after heat treatment?
The sequence is planned around the processes that can still move the geometry.
Depending on the component that means rough machining first, a controlled allowance, heat treatment, then grinding, EDM or finish machining. Critical dimensions are verified after the operations that establish the finished geometry, not before them.
09
Can you machine cooling holes, O ring grooves and sealing features?
Yes, when the features are clearly defined in the drawing or model.
Hole position, drilling depth, channel intersections, O ring groove geometry, threaded connections and sealing surfaces all follow the specified mold design. If you need pressure or leakage testing, define it as part of the project requirements so it is planned and priced in.
10
How do you handle repeat spare parts for the same mold?
Repeat components come from controlled manufacturing information tied to the correct part and revision.
That record holds the approved drawing revision, steel grade, hardness, critical dimensions, surface requirements and inspection criteria. Reusing the same confirmed reference is what keeps your next spare order off outdated mold data.
Send Your Drawing And Get A Quote In 24 Hours
Attach the component drawing or 3D model, tell us the steel, hardness and quantity, and you get a quote with our review notes back within 24 hours on business days.
Tell Us About The Component
Four fields. If you have the drawing ready, mention the file format and we send you an upload link with the reply.