Product Category
26 Product Lines
TMS — 001 to 026
Tool Steel &
Mold Steel
CNC Parts
26 product lines across five tool and mold steel categories — injection mold parts, stamping die parts, die-casting mold parts, tooling & fixtures, and wear & special tooling. P20, H13, D2, S136, M2, NAK80. CNC milling, EDM, wire EDM, precision grinding, mirror polishing, nitriding.
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CNC Mill
→
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EDM / Wire
→
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Heat Treat
→
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Grind
→
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Polish
Wire EDM Profile
±0.003 mm
Punch and die cavity profile — clearance controlled
EDM Sinker Profile
±0.005 mm
Cavity rib, corner, and texture features
Mirror Polish
Ra ≤0.025 μm
SPI A1 — optical-grade cavity finish
Guide Post OD
h5 · Ra ≤0.1 μm
Hardened SUJ2 / GCr15
Nitriding (H13)
HV 900+
Die-casting cavity thermal fatigue resistance
26
Product Lines
±0.003mm
Wire EDM
Ra ≤0.025μm
Mirror Polish
HV 900+
H13 Nitrided
24hr
Quote Turnaround
Mold Core ✦
Cavity Insert ✦
Punch ✦
Die Cavity ✦
Guide Post ✦
Guide Bushing ✦
Forming Block ✦
Slide / Cam Unit ✦
Hot Runner Part ✦
Tooling Fixture ✦
Wear Plate ✦
Die-Casting Part ✦
Tool Holder ✦
Inspection Gauge ✦
Mold Core ✦
Cavity Insert ✦
Punch ✦
Die Cavity ✦
Guide Post ✦
Guide Bushing ✦
Forming Block ✦
Slide / Cam Unit ✦
Hot Runner Part ✦
Tooling Fixture ✦
Wear Plate ✦
Die-Casting Part ✦
Tool Holder ✦
Inspection Gauge ✦
Full Product Range
26 Tool Steel & Mold Steel
Parts Across 5 Categories
Select a category tab · P20 · H13 · D2 · S136 · M2 · EDM + Wire EDM · Grinding · Polishing · MOQ 1 piece
Product Categories
Injection Mold PartsQuote →
Seven injection mold component lines in P20, H13, S136, and NAK80 — mold cores, cavity inserts, interchangeable inserts, locating pins, slide and cam units, hot runner parts, and support pillars. CNC 3D profile milling, EDM sinker for sharp features, wire EDM for through-profiles, precision grinding, and cavity polishing to SPI A1/A2 mirror finish. All parts supplied with dimensional inspection report.
TMS-002
INJECTION MOLD / 002 — FEATURED
Mold Cavity Inserts — Mirror Polished
S136 (SUS420J2, 1.2083) and NAK80 injection mold cavity inserts for transparent, cosmetic, and optically clear parts requiring highest surface quality. CNC 3D profile milling removes the majority of material; EDM sinker machines sharp internal corners (R <0.1mm), deep ribs, and textured details; hand polishing progresses through stone grades to diamond paste final polish. Surface finish grades supplied: SPI A2 (Ra ≤0.025μm, diamond paste — for optical-grade clear parts), SPI A3 (Ra ≤0.05μm), SPI B1 (Ra ≤0.1μm, fine stone), or VDI texture (bead blast matte). S136 preferred for mirror polish — low sulphide inclusion content prevents pitting at fine polish grades. NAK80 for EDM-intensive designs requiring excellent EDM accuracy and surface quality. Cavity hardness: S136 to HRC 48–52; NAK80 pre-hardened HRC 37–43. Cooling channel drilling and water baffle pocket machined integral. CMM 3D profile verification report included.
S136 · NAK80 · P20Get Quote
TMS-001
INJECTION / 001
Mold Cores
P20 (pre-hardened HRC 28–34) and H13 mold cores. CNC 3D profile + EDM rib and corner detail. Cooling channels drilled or machined. Profile tolerance ±0.01mm; parting line shut-off surfaces ground flat ±0.005mm. CMM report included.
P20 · H13 · S136Get Quote
TMS-003
INJECTION / 003
Interchangeable Mold Inserts
P20 / H13 interchangeable cavity and core inserts for modular mold systems. Insert OD to h6 for tight pocket fit; profile to drawing; EDM details. All inserts supplied as matched sets with CMM inter-part position verification.
P20 · H13 · NAK80Get Quote
TMS-005/006/007
INJECTION / 005–007
Slides, Hot Runner & Support Parts
P20/H13 slide and cam units (sliding face Ra ≤0.2μm, angle ±0.05°); H13 hot runner manifold and nozzle bodies (gate orifice ±0.002mm, nitrided); and P20 support pillars (matched height ±0.01mm). All to drawing.
P20 · H13 · H11Get Quote
Stamping Die PartsQuote →
Five D2/SKD11 stamping die part lines — punches, die cavities, forming blocks, clamping blocks, and cut-off seats. Wire EDM profile accuracy ±0.003mm standard for punch and die cavity profiles; blanking clearance controlled per material and thickness. All D2 parts hardened HRC 58–62 after wire EDM profiling — the correct sequence that avoids heat treatment distortion affecting the wire EDM profile accuracy.
TMS-008/009
STAMPING DIE / 008–009 — FEATURED
D2/SKD11 Punches & Die Cavities
D2 (Cr12MoV / SKD11) blanking punches and mated die cavity plates for precision stamping operations. Wire EDM profile accuracy ±0.003mm — directly controlling punch-to-die blanking clearance. Correct sequence: rough machine blank → harden and temper HRC 58–62 → wire EDM profile in fully hardened condition. This eliminates heat treatment distortion from the final profile dimension — pre-hardening rough machining then hardening and wire EDM after ensures the profile tolerance is held at final hardness, not compromised by post-EDM hardening distortion. Clearance per side: 5–12% of material thickness (specified in drawing or calculated at DFM review). Punch retainer plate bore H6 for tight punch shank fit. Ground top reference face flatness ±0.003mm. CMM punch profile and die cavity profile verification report. Matched punch/die sets supplied and CMM verified as pairs.
D2 · SKD11 · Cr12MoV · M2Get Quote
TMS-011/012
STAMPING / 011–012
Clamping Blocks & Cut-Off Seats
D2 clamping blocks (contact face flatness ±0.005mm, HRC 58–62) and D2/M2 cut-off seats (blade seat Ra ≤0.2μm, HRC 60–62). Wire EDM slot profiles; ground reference faces. Stripper bolt counterbores to drawing.
D2 · M2 · SKD11Get Quote
Manufacturing Capability
What Tool & Mold Steel Parts Require
Beyond Standard CNC Milling
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Wire EDM — Profile ±0.003mm in Hardened Steel
Wire EDM cuts complex punch and die profiles through fully hardened D2 (HRC 58–62) with accuracy ±0.003mm — independent of material hardness. Correct sequence: harden first, then wire EDM. Hardening after wire EDM introduces distortion that defeats the profile tolerance. We machine in the correct sequence.
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EDM Sinker — Sharp Corners, Deep Ribs, Texture
EDM sinker machines features impossible by milling: internal corners R<0.1mm, deep narrow ribs (W:D >1:5), textured cavity surfaces (VDI 3400 matched to standard), and draft-free sidewalls. Accuracy ±0.005mm. Surface finish after EDM: Ra 0.4–2.0μm depending on spark setting — subsequent polishing removes recast layer.
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Mirror Polish — SPI A1 Ra ≤0.025μm
Cavity polishing progresses: rough stone → medium stone → fine stone → wet/dry paper → diamond paste. SPI A2 (Ra ≤0.025μm) standard for transparent parts. S136 and NAK80 specified for mirror polish — their low sulphide inclusion content avoids pitting that occurs in P20 at fine polish stages. Ra measured by profilometer and documented.
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Nitriding H13 — HV 900+ Thermal Fatigue
Gas or plasma nitriding of H13 die-casting mold cavities to HV 900+, case depth 0.1–0.2mm. Mandatory on all die-casting cavities — nitriding is the primary defence against thermal fatigue cracking and molten aluminum erosion/soldering. Not optional. Applied after all machining and EDM — nitriding is the last process before assembly.
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Precision Grinding — Flatness ±0.003mm Post-HT
All reference faces, shut-off surfaces, and guide features precision surface-ground after heat treatment — restoring dimensional accuracy lost to HT distortion (0.05–0.2mm typical). Face flatness ±0.003mm standard. Guide post OD h5, guide bushing bore H6 — all ground post-HT. CMM verification after grinding.
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CMM 3D Profile Verification
All mold core and cavity 3D profiles CMM-verified after machining — not just reference faces. Profile deviation colour map report shows actual form error vs nominal CAD. Enables identification of specific features requiring rework before tool assembly. Matched punch/die sets CMM-verified as pairs for clearance confirmation.
Precision Specifications
Tolerances & Process Reference — Tool & Mold Steel Parts
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Tolerances by Feature
Wire EDM Profile
±0.003 mm
EDM Sinker Profile
±0.005 mm
Cavity Polish (SPI A2)
Ra ≤0.025 μm
Reference Face Flat
±0.003 mm
Guide Post OD
h5 / ±0.003mm
Guide Bush Bore
H6
Locating Pin Pos.
±0.005 mm
Valve Gate Orifice
±0.002 mm
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Steel Grade & Hardness Reference
P20 (1.2311)
HRC 28–34
Pre-hardened. Large injection mold bodies. Best machinability of mold steels. Limited to ~SPI B1 polish.
H13 (SKD61)
HRC 44–52
Standard die-casting and injection mold steel. Nitrided for die-casting. Best thermal fatigue resistance.
S136 (1.2083)
HRC 48–52
Mirror-polish injection mold steel. SPI A1/A2. Best choice for transparent and cosmetic parts.
D2 (SKD11)
HRC 58–62
Standard cold-work die steel. Punches, die cavities, wear plates. Wire EDM after hardening.
M2 (SKH51 HSS)
HRC 62–65
High-speed steel for punches requiring hot hardness and maximum wear in thin-sheet blanking.
SUJ2 / GCr15
HRC 60–64
Guide posts and bushings. Best wear life in sliding contact. Matched pairs CMM verified.
Material Selection
Tool & Mold Steel Grades for Every Tooling Application
Tool steel grade selection is determined by the application's primary failure mechanism — wear, thermal fatigue, or toughness requirement.
MAT / 01
P20 (1.2311 / P20H)
HRC 28–34 pre-hardened · Best machinability
Standard injection mold steel for large mold bases and bodies. Pre-hardened — no post-machining heat treatment required. Best machinability of mold steels. Limited to SPI B1 surface finish. Not for die-casting (insufficient thermal fatigue resistance).
Injection moldLarge parts
MAT / 02
H13 (SKD61 / 1.2344)
HRC 44–52 · Thermal fatigue resistant
Universal hot-work tool steel. Die-casting molds, hot runner components, injection mold cores requiring high hardness. Nitrided for die-casting. Best thermal fatigue resistance of common mold steels. Higher Cr-Mo-V than H11.
Die-castingHot runner
MAT / 03
S136 (1.2083 / SUS420J2)
HRC 48–52 · Mirror polish to SPI A1
Corrosion-resistant injection mold steel for PVC, chemically aggressive resins, and cosmetic/optical parts requiring SPI A1/A2 mirror finish. Low sulphide content prevents pitting at fine polish stages. Also used for food-contact and medical device molds.
Mirror polishPVC molds
MAT / 04
D2 (SKD11 / Cr12MoV)
HRC 58–62 · Best wear for cold work
Standard cold-work die steel. Punches, blanking dies, forming blocks, wear plates. High carbon-chromium provides excellent wear resistance in cold forming and blanking applications. Wire EDM profiled after hardening.
PunchesWear plates
MAT / 05
M2 (SKH51 / HSS)
HRC 62–65 · Hot hardness
High-speed steel for punches requiring both maximum hardness and hot hardness retention in high-speed thin-sheet blanking. Tungsten and molybdenum additions provide hardness retention at elevated temperatures during high-speed blanking where punch temperature rises significantly.
Fine blankingHot hardness
<
MAT / 06
NAK80
HRC 37–43 pre-hardened · Best EDM quality
<Japanese mold steel — excellent EDM surface quality and good polishability to SPI A3/B1. Pre-hardened HRC 37–43. Better EDM accuracy and surface quality than P20. Used for EDM-intensive cavity designs and molds requiring both EDM quality and moderate polish finish.< div class = "tgs" >< span class = "u-tag is-p1" >EDM-intensive< span class = "u-tag is-n" >SPI A3/B1
Surface Treatments
Surface Finishing for Tool & Mold Steel Parts
Surface treatment choice in mold steel determines mold life, part appearance, and release behaviour — not cosmetics.
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Mirror Polish (SPI A1/A2)
Hand polishing to SPI A2 (Ra ≤0.025μm, diamond paste) for transparent and optical injection mold cavities. S136 and NAK80 specified — low sulphide prevents pitting at fine grades. Ra measured by profilometer. Recast layer from EDM must be removed before polishing.
S136 / NAK80Optical parts
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Gas / Plasma Nitriding (H13)
HV 900+, case 0.1–0.2mm. Mandatory on all H13 die-casting cavity surfaces — thermal fatigue resistance and aluminum erosion protection. Applied after all machining, EDM, and reference face grinding. Last process before assembly. Not optional on die-casting molds.
H13 die-castingHot runner
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PVD TiN / TiAlN Coating
2–4μm PVD coating on punches and forming dies — HV 2300–3500 surface hardness, reduced friction and adhesion of punched material. Extends punch life 3–5× in stainless and high-strength steel blanking. Applied after final grinding; dimensional change 2–4μm per surface accounted for in grinding.
PunchesForming dies
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Black Oxide / Phosphate
Hot black oxide or zinc phosphate for mild corrosion protection on tool steel parts during storage and transit. Zero dimensional change — preserves all ground tolerances. Standard for guide posts, wear plates, and fixture components not requiring other treatments.
Guide postsTransit
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VDI / SPI Bead Blast Texture
Glass bead or alumina blast to produce controlled matte texture on injection mold cavity surfaces: SPI D1–D3 (Ra 0.8–3.2μm) or custom EDM-matched texture. Used for structural and decorative texture on injection-molded parts. Applied after all machining and EDM — must not reach polished surfaces.
Textured moldsSPI D1–D3
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Cryogenic Treatment (D2)
-196°C cryogenic treatment after quench converts retained austenite in D2 to martensite — improving dimensional stability and wear resistance. Used for precision gauge blocks and wear plates where long-term dimensional stability matters. Reduces punch and die wear by 15–25% in high-cycle blanking.
Gauge blocksWear plates
Production Workflow
From Drawing to Hardened, Ground, Polished Tool Part
01
DFM Review
Grade selection, HT sequence, EDM vs mill feasibility, polish grade, and nitriding scope confirmed. 24hr.
02
CNC Milling
Rough and semi-finish milling of 3D profile. Cooling channels drilled. HT allowance left on all surfaces.
03
Heat Treatment
Harden and temper to specification. Cryogenic treatment where specified. Hardness test per piece.
04
EDM / Wire EDM
Wire EDM profiles ±0.003mm; sinker EDM corners, ribs, textures ±0.005mm — all in hardened steel.
05
Grind & Polish
Reference faces ground ±0.003mm; guide features h5/H6. Mirror polish to SPI A1/A2 where required.
06
Treat & Deliver
Nitriding / PVD / black oxide as specified. CMM 3D profile report. HT record + mat cert enclosed.
Our Advantage
Why Mold Makers Specify Our Tool Steel Parts
Seq
Correct Process Sequence — HT Before EDM
D2 punches and die cavities wire EDM profiled after hardening — not before. Hardening after wire EDM introduces 0.05–0.2mm distortion that compromises the profile tolerance. This is the most common mistake in tool steel manufacturing. We machine in the correct sequence every time.
Nit
H13 Die-Casting — Nitriding Not Optional
H13 die-casting cavity surfaces nitrided to HV 900+ as standard — not as a premium option. Nitriding is the primary defence against thermal fatigue cracking and molten aluminum erosion. A die-casting mold without nitrided cavity surfaces is undersupplied, regardless of base steel hardness.
A2
SPI A2 Ra ≤0.025μm — Profilometer Verified
Mirror polish Ra measured by profilometer and documented — not claimed from visual inspection. S136 and NAK80 specified (not P20) for mirror polish — low sulphide content is the material property that determines whether fine polishing produces a uniform mirror or a pitted surface.
CMM
3D Profile CMM — Deviation Colour Map
Mold core and cavity 3D profiles CMM-verified with full deviation colour map report — showing actual form error vs CAD on all surfaces, not just reference faces. Features requiring rework identified before tool assembly. Matched punch/die sets CMM-verified as pairs for blanking clearance confirmation.
Frequently Asked Questions
Tool Steel & Mold Steel — Common Questions
Technical questions about tool steel grades, EDM, polishing, heat treatment sequence, and die-casting nitriding.
Injection molds: P20 (pre-hardened HRC 28–34, large bodies), H13 (HRC 44–52, die-casting and hot runner), S136 (HRC 48–52, mirror polish and PVC), NAK80 (HRC 37–43, excellent EDM). Stamping dies: D2/SKD11 (HRC 58–62, cold work wear), M2/SKH51 (HRC 62–65, high-speed punch hot hardness). Die-casting: H13/H11 (thermal fatigue resistance, nitrided). Guide posts/wear: SUJ2/GCr15 (HRC 60–64, matched pairs).
Three-process combination: (1) CNC milling — rough and semi-finish 3D profile, Ra ≤0.4μm in pre-hardened P20/NAK80; (2) EDM sinker — sharp internal corners (R<0.1mm), deep ribs, textured surfaces, accuracy ±0.005mm; (3) Grinding — reference faces ±0.003mm, guide features h5/H6, all post-HT. Final surface: hand polish to SPI A1/A2 for cosmetic cavities; bead blast for texture. Wire EDM for stamping punch and die profiles ±0.003mm in fully hardened steel.
Wire EDM profile accuracy: ±0.003mm on punch and die cavity profiles — standard for blanking clearance control. Punch OD/die bore after wire EDM: ±0.003mm. Grinding: punch OD h5/h6; die plate reference face flatness ±0.003mm. Clearance control: punch and die profiles held to ±0.003mm each — total pair clearance per side maintained within ±0.006mm of nominal, typically 5–12% of material thickness.
H13 die-casting sequence: (1) rough machine in annealed state; (2) stress relief anneal; (3) harden to HRC 44–52; (4) finish grind reference faces and guide holes; (5) EDM detail features; (6) gas or plasma nitriding HV 900+, case 0.1–0.2mm — mandatory for thermal fatigue and aluminum erosion resistance; (7) polish cavity faces Ra ≤0.2μm after nitriding. Nitriding is the last machining process before assembly. Heat treatment record and nitriding certificate included with every H13 die-casting component.
EDM (electrical discharge machining) removes material by controlled spark erosion — enabling features impossible by milling. Sinker EDM: internal corners R<0.1mm, deep ribs (W:D >1:5), cavity textures, ±0.005mm accuracy. Wire EDM: complex 2D profiles through full plate thickness — standard for punch profiles and die cavity through-holes, ±0.003mm accuracy. Key advantage: EDM accuracy is independent of material hardness — D2 at HRC 62 is machined to the same accuracy as annealed steel. This allows wire EDM after hardening — the correct sequence that avoids HT distortion affecting profile accuracy.
SPI grades supplied: A1 (Ra ≤0.012μm, diamond paste — optical clear); A2 (Ra ≤0.025μm — standard transparent/cosmetic); A3 (Ra ≤0.05μm); B1 (Ra ≤0.1μm, fine stone); C1 (Ra ≤0.4μm, stone polished); D1–D3 (bead blast matte). VDI 3400 EDM textures from VDI 12 to VDI 45. S136 and NAK80 specified for SPI A1/A2 — P20 limited to ~B1 due to sulphide pitting at fine polish grades. Ra measured by profilometer and documented.
Yes — supplied as CMM-verified matched pairs. Guide post: SUJ2 HRC 60–64, OD h5 (±0.003mm), cylindricity ≤0.003mm full length, Ra ≤0.1μm. Guide bushing: bore H6, OD/bore concentricity ≤0.003mm. Clearance per side: 0.008–0.015mm. Both from matching hardness SUJ2 — dissimilar hardness pairs wear asymmetrically. Standard Ø12–Ø60mm; custom to drawing. Bronze self-lubricating bushing option. CMM report enclosed with every set.
MOQ: 1 piece. Lead times: simple hardened/ground parts (guide posts, pins, wear plates): 7–14 working days. Complex 3D mold cores/cavities (CNC + EDM + HT + polish): 15–25 working days. H13 die-casting with nitriding: 18–28 working days. Stamping punch/die sets with wire EDM: 10–18 working days. Urgent tooling repair: expedited service available — please discuss schedule. All parts with dimensional inspection report and HT record.
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Every enquiry includes a DFM review — tolerance feasibility, material confirmation, and process approach confirmed before production starts. MOQ 1 piece.
24hr
Quote Response
MOQ 1
Prototypes OK
ISO
9001:2015
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DFM Review on Every Enquiry
Tolerance feasibility, fixturing strategy, and material confirmation. Specific, actionable feedback — not generic pushback.
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First Article Inspection — Standard
FAI report on every new run. Material certs and surface treatment certs included with every shipment.
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Same Process: Prototype to Production
Process plan from your prototype applies to production batches. No re-qualification when you scale.
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3 / 4 / 5-Axis CNC + Turning
Complex structural parts, shafts, housings, and transmission components. Metals and engineering plastics.
ISO 9001:2015
3/4/5-Axis Milling
CNC Turning
CMM Inspection
Global Delivery