Categorie Produs
BRS — 001 to 012
Oțel pentru rulmenți
Precizie
Piese de uzură
12 product lines machined from GCr15 bearing steel (52100/SUJ2/100Cr6) — bearing rings, roller shafts, guide shafts, needle roller guides, pin shafts, spindle parts, guide wheels, wear bushings, and linear motion components. HRC 60–64. Ground to h5/H6. Raceway Ra ≤0.05 μm.
Rockwell Hardness Scale — GCr15 Parts vs Common Grades
Q235
HRB85
HRB85
45# N
HRC20
HRC20
42CrMo
HRC32
HRC32
40Cr
HRC42
HRC42
GCr15
HRC60
HRC60
GCr15
HRC64 ▶
HRC64 ▶
SoftMediuHardVery HardBearing Grade
GCr15 through-hardened to HRC 60–64 — the standard for rolling contact wear applications
HRC 64
Duritate maximă
Ra 0.05μm
Raceway SF
12
Game de produse
HRC 60–64
GCr15 Hardness
h5 / H6
Ground Tolerance
Ra ≤0,05μm
Raceway SF
24hr
Timp de răspuns pentru ofertă
Inel de rulment ✦
Axe de role ✦
Needle Roller Guide Parts ✦
Wear-Resistant Pin Shafts ✦
Precision Spindle Parts ✦
Guide Wheels ✦
High-Hardness Shaft Parts ✦
Wear-Resistant Bushings ✦
Precision Guide Shafts ✦
Linear Motion Parts ✦
Rolling Mechanism Parts ✦
Mechanical Wear Parts ✦
Inel de rulment ✦
Axe de role ✦
Needle Roller Guide Parts ✦
Wear-Resistant Pin Shafts ✦
Precision Spindle Parts ✦
Guide Wheels ✦
High-Hardness Shaft Parts ✦
Wear-Resistant Bushings ✦
Precision Guide Shafts ✦
Linear Motion Parts ✦
Rolling Mechanism Parts ✦
Mechanical Wear Parts ✦
Gama completă de produse
12 Bearing Steel
Precision Wear Product Lines
Select a category tab · GCr15 / 52100 / SUJ2 · HRC 60–64 · Ground post-hardening · MOQ 1 piece
Shafts & Roller Parts
Citat →
Four hardened and ground shaft product lines in GCr15 bearing steel — roller shafts, wear-resistant pin shafts, high-hardness shaft parts, and precision guide shafts. All OD ground after hardening to h5/h6 tolerance. Cylindricity ≤0.002–0.003 mm. Surface finish Ra ≤0.1–0.2 μm standard; Ra ≤0.05 μm lapped on precision spindle and guide applications.
BRS-009
SHAFTS / 009 — FEATURED
Precision Guide Shafts
Hardened and ground precision linear guide shafts for recirculating ball bushings (linear bearings), needle roller bushings, and plain bush linear guides. GCr15 through-hardened HRC 60–64; OD tolerance h5 (±0.003–0.005 mm on nominal diameter); cylindricity ≤0.003 mm across the full shaft length — the critical specification because linear bearing inner diameter maintains radial clearance along the shaft, and any cylindricity deviation produces localized contact stress and bearing noise. Straightness ≤0.01 mm/m; Ra ≤0.1 μm standard, Ra ≤0.05 μm lapped for highest-precision linear stages. Hard chrome plating option (15–25 μm, HV 1000+) for maximum wear life on high-cycle, high-speed linear axes — chrome-plated guide shafts then re-ground to OD dimension after plating. Chamfered ends and centre-drilled for steady-rest during grinding. Diameter range Ø4–Ø80 mm standard; larger on request.
GCr15 · SUJ2 · 100Cr6
Solicită ofertă
BRS-002
SHAFTS / 002
Axe de role
Hardened and ground roller shafts and cam follower shafts. GCr15 HRC 60–64; OD h6; cylindricity ≤0.003 mm; Ra ≤0.2 μm. Chamfered or radiused ends. Used for conveyor rollers, cam followers, and rolling element support shafts where journal hardness must match the rolling element hardness.
GCr15 · 40Cr HTSolicită ofertă
BRS-004
SHAFTS / 004
Wear-Resistant Pin Shafts
Hardened pin shafts and pivot pins for high-cycle articulation joints. GCr15 HRC 60–64; OD h6; cylindricity ≤0.002 mm. Ra ≤0.2 μm standard. Hard chrome plating option for additional corrosion and wear resistance. Chamfered leading end; retaining groove option.
GCr15 · SUJ2Solicită ofertă
BRS-007
SHAFTS / 007
High-Hardness Shaft Parts
General-purpose high-hardness shaft and rod parts in GCr15 or Cr12MoV. HRC 60–64; OD h6; cylindricity ≤0.003 mm. Used in press tooling, cold forming dies, and machine elements where maximum hardness and wear resistance are required.
GCr15 · Cr12MoV · D2Solicită ofertă
Materiale: GCr15 · SUJ2 · 100Cr6 · 40Cr (HT) · Cr12MoV · D2
Solicită Toate 4 →
Bearing Rings & Spindle Parts
Citat →
Bearing ring blanks and finish-ground bearing rings in GCr15, and ultra-high-precision spindle bodies for machine tool and instrument applications. Bearing ring raceway superfinished to Ra ≤0.05 μm. Spindle OD h4/h5; roundness ≤0.001 mm. All bearing rings supplied with concentricity report. Spindle parts with dimensional stability option (cryogenic treatment) for long-term positional accuracy.
BRS-001
BEARING / 001 — FEATURED
Inel de rulment
GCr15 bearing ring inner and outer race blanks and finish-ground rings for custom and non-standard bearing sizes. Supplied in two states: (A) rough-turned + hardened HRC 60–64, ready for customer cylindrical and ID grinding — all surfaces with ±0.3 mm grinding allowance; (B) finish-ground — OD h5, bore H6, face parallelism ±0.005 mm, OD/bore concentricity ≤0.003 mm, raceway profile ground to ±0.005 mm. Raceway superfinishing to Ra ≤0.05 μm available — this removes grinding-induced surface tensile stress and marks that initiate subsurface fatigue cracks under rolling contact loading. Cryogenic treatment (-80°C) after hardening available for maximum dimensional stability. Hardness test per piece included.
GCr15 · SUJ2 · 100Cr6
Solicită ofertă
BRS-005
BEARING / 005
Precision Spindle Parts
High-precision spindle bodies for machine tool spindles, measuring instruments, and precision rotary stages. GCr15 HRC 60–64; OD h4/h5; roundness ≤0.001 mm; Ra ≤0.05 μm (superfinished). Cryogenic treatment for long-term dimensional stability. CMM roundness and cylindricity report included.
GCr15 · SUJ2Solicită ofertă
BRS-001B
BEARING / 001B
Custom Non-Standard Bearing Rings
Non-standard bearing rings for obsolete, large-diameter, and application-specific bearings unavailable from catalogue sources. Custom OD, bore, and width to drawing. GCr15 finish-ground in the same operations as standard bearing rings. MOQ 1 piece.
GCr15 · SUJ2Solicită ofertă
Materiale: GCr15 · SUJ2 · 100Cr6 / 52100
Solicită toate cele 3 →
Guide Wheels & Needle Guides
Citat →
Guide wheels and track rollers for linear profiled rail and circular track guidance applications, and needle roller guide cage parts for needle bearing linear and rotary assemblies. Guide wheel OD profile ground to ±0.005 mm; bore H6; GCr15 HRC 60–64. Needle guide rail profile ground to ±0.005 mm; surface Ra ≤0.1 μm for consistent needle contact.
BRS-006
GUIDES / 006 — FEATURED
Guide Wheels & Track Rollers
Hardened GCr15 guide wheels and track rollers for V-groove, flat track, and profiled rail linear and rotary guidance systems. OD profile ground to ±0.005 mm — profile tolerance directly determines tracking accuracy. Bore H6 for mounting on shaft; OD/bore concentricity ≤0.003 mm for uniform radial runout during rolling contact. Ra ≤0.2 μm on OD contact face. Two-flange, single-flange, and flat OD profiles available. Custom V-groove angle, flange diameter, and contact width to drawing. Applications: linear gantry guide rollers, cam track rollers, conveyor guide wheels, and automated storage/retrieval system carriage wheels. Hard chrome OD option for maximum rolling surface wear life.
GCr15 · SUJ2 · Cr12MoV
Solicită ofertă
BRS-003
GUIDES / 003
Needle Roller Guide Parts
Precision needle roller cage guides and linear needle rail guides. GCr15 HRC 60–64; needle contact surface Ra ≤0.1 μm; profile tolerance ±0.005 mm. Used in flat-cage linear needle bearing assemblies and custom needle roller retainer guides where standard cage sizes are unavailable.
GCr15 · SUJ2Solicită ofertă
BRS-006B
GUIDES / 006B
Custom Cam & Track Rollers
Custom cam follower roller bodies and profiled track rollers with non-standard OD profile geometry (crowned, gothic arch, or custom curve). Profile ground to ±0.005 mm by CNC profile grinding. GCr15 HRC 60–64. Bore H6; stud thread option for stud-type cam followers.
GCr15 · Cr12MoVSolicită ofertă
Materiale: GCr15 · SUJ2 · 100Cr6 · Cr12MoV
Solicită toate cele 3 →
Bushings, Linear & Rolling Parts
Citat →
Wear-resistant bushings, linear motion housing parts, rolling mechanism components, and custom mechanical wear-resistant parts in GCr15 and tool steel. Bushing OD/ID concentricity ≤0.003 mm; H6 bore ground after hardening. Linear motion housing bore H6; surface hardness HRC 58–64. All parts with dimensional report and hardness test record.
BRS-008
BUSHINGS & LINEAR / 008 — FEATURED
Wear-Resistant Bushings
Hardened GCr15 bearing steel bushings for high-load, high-cycle applications where bronze or standard steel bushings have insufficient wear life. Through-hardened HRC 60–64 after rough turning; bore and OD ground after hardening to remove heat-treatment distortion. OD/ID concentricity ≤0.003 mm — ensures even wall thickness and uniform load distribution across the bushing bore, preventing localised stress concentration. Bore H6 ground to Ra ≤0.2 μm; OD k6 for interference fit into housing. Oil groove and lubrication hole options — machined before hardening at pre-agreed locations. Flange bushing versions. Applications: press tool guide bushings, injection mould guide elements, cam follower bushings, chain sprocket bushings, and articulation joint bushings in high-load machines. Supplied with CMM concentricity report and hardness test certificate.
GCr15 · SUJ2 · Cr12MoV
Solicită ofertă
Materiale: GCr15 · SUJ2 · 100Cr6 · Cr12MoV · D2 Tool Steel
Solicită Toate 4 →
Capacități de fabricație
What Bearing Steel Parts Require
Beyond Standard Hardening and Turning
💎
Superfinishing — Ra ≤0.05 μm After Grinding
Raceway surfaces and precision spindle ODs superfinished to Ra ≤0.05 μm — 8× better than ground Ra ≤0.4 μm. Superfinishing removes grinding marks and surface tensile stress that initiate rolling contact fatigue cracks. For bearing rings, this directly extends raceway fatigue life under rolling contact loading.
Ra ≤0.05μmRacewaysSpindle parts
❄
Cryogenic Treatment — Long-Term Stability
Cryogenic treatment (-80°C to -196°C) after quench converts retained austenite to martensite — reduces long-term dimensional drift to <1 μm over years. For precision guide shafts and spindle parts in measurement equipment or machine tools where dimensional stability over time is a specification, not an assumption.
-196°C treatment<1μm driftSpindle / guide
⚙
Ground Post-Hardening — h5/H6 Maintained
All GCr15 parts ground after hardening — not before. Hardening distorts dimensions by 0.05–0.2 mm. Pre-hardening grinding produces a part that meets tolerance before hardening but not after. Post-hardening cylindrical grinding restores OD h5/h6 and bore H6 to specification after distortion is eliminated.
Post-HT grindh5 / H6Cylindricity ≤0.003mm
📊
Hardness — 100% Per-Piece Test on All Parts
Every hardened bearing steel part hardness-tested on Rockwell tester before delivery. HRC 60–64 verified per piece — not sampled per batch. A batch average of HRC 62 could include individual parts at HRC 57 (too soft) that a sampling plan would miss. Per-piece testing is the only way to guarantee specification.
100% per pieceHRC 60–64Reported per order
◎
Concentricity ≤0.003 mm — OD to Bore
Bearing ring and bushing OD/bore concentricity ≤0.003 mm — measured by CMM after grinding. For a bearing ring, OD/bore concentricity determines raceway-to-housing eccentricity, which loads the rolling elements non-uniformly and reduces bearing life. Not assumed from grinding setup — measured and reported.
≤0.003mmCMM measuredPer piece report
📐
Guide Shaft Cylindricity — Full Length
Guide shaft cylindricity ≤0.003 mm measured over the full shaft length — not just at the ends. A shaft that is h5 at both ends but bends or tapers in the middle generates variable radial clearance in the linear bearing and causes binding at the deviation location. We measure and report cylindricity across multiple sections.
Full-length measure≤0.003mmMulti-section
Specificații de precizie
Tolerances & Hardness Reference — Piese din oțel pentru rulmenți
📐
Toleranțe după caracteristică
Guide Shaft OD
h5 / ±0.003mm
Shaft OD Std
h6 / ±0.006mm
Bore (Bushing)
H6
Spindle OD
h4 / ±0.002mm
OD/Bore Concentric
≤0.003 mm
Cilindricitate
≤0.003 mm
Roundness (Spindle)
≤0.001 mm
Surface (Raceway SF)
Ra ≤0,05 μm
🔩
Hardness & Material Reference
GCr15 Hardness
HRC 60–64
Through-hardened. Uniform core and surface. Standard bearing steel specification.
Cr12MoV Hardness
HRC 60–62
High-carbon chromium tool steel. Higher carbon than GCr15. For die and heavy-wear parts.
Raceway Ra
≤0,05μm
Superfinished bearing ring raceway. Removes grinding stress layer. Extended fatigue life.
Guide Shaft Ra
≤0.1μm
Precision guide shaft OD. Standard for recirculating ball bushing linear guidance.
Criogenic
-196°C
Optional post-quench treatment. Converts retained austenite. <1μm long-term drift.
Hardness Test
100%
Every piece tested. HRC per piece report. Not sampled — verified.
Selecție de materiale
Bearing Steel Grades for Precision Wear Parts
Bearing steel grade selection is driven by hardness uniformity, dimensional stability after heat treatment, and rolling contact fatigue life.
MAT / 01
GCr15 (52100 / SUJ2 / 100Cr6)
HRC 60–64 · C 0.95–1.05% · Cr 1.4–1.65%
The universal bearing steel for all bearing rings, guide shafts, roller shafts, and wear bushings. Best rolling contact fatigue life. Through-hardened uniformly to HRC 60–64. Excellent dimensional stability after proper heat treatment and cryogenic treatment.
All Bearing PartsStandard grade
MAT / 02
Cr12MoV (D2 equivalent)
HRC 60–62 · High carbon-chromium tool steel
For wear-resistant bushings, custom wear parts, and cam guide parts requiring higher carbide volume fraction than GCr15. Better wear resistance than GCr15 in sliding wear applications. Standard for die guide bushings, injection mould guide elements, and heavy-duty wear liners.
Wear BushingsDie Guides
MAT / 03
SUJ2 / 100Cr6 / AISI 52100
International equivalents to GCr15 · Same specification
International equivalent grades — SUJ2 (JIS, Japan), 100Cr6 (EN, Europe), 52100 (AISI, USA) — all meet the same chemical composition and performance specification as GCr15. We can source and certify any of these grades for export orders requiring specific country standards. Mill certificate with grade designation per customer requirement.
Export ordersAny standard
MAT / 04
D2 Tool Steel (Cr12)
HRC 58–62 · Best sliding wear resistance
Best sliding and abrasive wear resistance of common tool steels due to high vanadium carbide content. Used for custom wear liners, punch and die elements, and machine wear parts where abrasive wear (rather than rolling contact fatigue) is the primary failure mechanism.
Abrasive wearWear liners
<<div class="num">MAT / 05
M2 HSS (High Speed Steel)
HRC 62–65 · Best hot hardness
< div class="dc">For custom wear parts and spindle elements requiring hardness retention at elevated operating temperatures (above 200°C) where GCr15 softens. Also used for spindle nose parts in high-speed cutting applications. HRC 62–65 achievable. Harder to machine than GCr15 — all features ground after hardening.Tratament de suprafață
Surface Finishing for Bearing Steel Precision Parts
Surface treatment for hardened bearing steel parts must preserve dimensional tolerance achieved by precision grinding — most coatings require tolerance allowance at DFM stage.
✦
Placare cu Crom Dur
10–30 μm, HV 1000–1200. Applied after grinding, then re-ground to OD final dimension. Standard for guide shafts and roller shafts requiring maximum OD wear resistance and corrosion resistance. Chrome plating tolerance must be specified — plating thickness is controlled and allowance provided in pre-plate grinding.
Ramele de ghidareAxe de role
🔲
Oxid Negru
Zero dimensional change (<0.5 μm). Mild corrosion protection and rust prevention for oil-lubricated bearing steel parts. Applied after precision grinding — preserves all h5/h6 tolerances. Standard storage and transit treatment for ground bearing steel parts before assembly.
All ground partsTransit protection
💧
Electroless Nickel (3–5 μm)
Thin EN (3–5 μm) for corrosion protection of guide shafts and roller shafts in humid and chemical environments where hard chrome is over-specified. Tight dimensional control — thickness specified and confirmed at DFM. Applied after precision grinding; re-measured post-plating.
Humid env.Chemical contact
🌟
PVD TiN / TiAlN (2–4 μm)
Physical vapour deposition TiN (gold, HV 2300) or TiAlN (grey, HV 3500) coating. Near-zero dimensional change (2–4 μm per surface). Maximum surface hardness for guide shaft ODs in abrasive particle environments — coating is harder than the hard chrome it replaces without the thermal stress of chrome plating.
Abrasive env.PVD coated
❄
Oil Protection Packaging
All ground bearing steel parts packed with corrosion-inhibitor oil and individually wrapped in VCI (volatile corrosion inhibitor) film. Protects superfinished and ground surfaces during transit and storage. Ground Ra ≤0.05 μm surfaces are particularly susceptible to rust during transit if unprotected — we never ship unprotected hardened ground parts.
All ground partsStandard
💎
Superfinish (Ra ≤0.05 μm)
Not a coating — a surface finishing operation. Honing or vibratory superfinishing after cylindrical grinding to Ra ≤0.05 μm. Removes grinding marks and surface tensile residual stress. Standard for bearing ring raceways and precision spindle ODs. Extends rolling contact fatigue life significantly compared to ground-only surfaces.
RacewaysSpindle OD
Flux de lucru pentru producție
De la desen la Superfinished, Certified Bearing Steel Part
01
Revizuire DFM
Grade, HT process, grinding allowance, cryogenic spec, and superfinish scope confirmed. 24hr response.
02
Material
GCr15 billet or bar receipted with mill certificate. Chemical composition per heat number verified.
03
Rough Turning
Rough turned to ±0.3mm grinding allowance on all surfaces. Raceway profiles pre-turned.
04
Hardening & Cryo
Through-harden HRC 60–64. Cryogenic treatment (-196°C) if specified. Per-piece hardness test recorded.
05
Șlefuire de Precizie
OD cylindrical + bore ID grinding post-HT. Raceway superfinish to Ra ≤0.05μm where specified.
06
CMM & Delivery
CMM concentricity + cylindricity report. Per-piece HRC record. VCI oil pack. Mill cert enclosed.
Avantajul nostru
Why Precision Engineers Specify Our Bearing Steel Parts
SF
Superfinish Ra ≤0.05μm — Raceway Grade
Bearing ring raceways and spindle ODs superfinished to Ra ≤0.05 μm — bearing-manufacturer surface quality. Grinding marks that remain at Ra ≤0.4 μm initiate subsurface fatigue cracks under rolling contact loading. We remove them. The difference between a bearing ring that lasts 10 million cycles and one that fails at 1 million.
100%
Hardness Per Piece — Every Single Part
Every hardened bearing steel part Rockwell-tested before delivery. HRC 60–64 verified per piece — not sampled per batch. A batch with one under-hardened part at HRC 55 is a field failure. Per-piece testing eliminates this risk. HRC recorded and reported per part number.
POST
Ground After Hardening — Not Before
All OD and bore features precision-ground after hardening and cryogenic treatment. Hardening distorts by 0.05–0.2 mm. Pre-hardening grinding is meaningless for a precision part. Post-hardening grinding restores h5/H6 tolerance after distortion is complete and will not recur.
❄
Cryogenic Treatment — Dimensional Stability
Cryogenic treatment available for precision guide shafts and spindle parts where long-term positional stability matters. Converts retained austenite to martensite. Reduces dimensional drift to <1 μm over years. Not offered as a premium — offered as the solution to retained austenite instability that most suppliers ignore.
Întrebări frecvente
Bearing Steel Precision Parts — Întrebări frecvente
Technical questions about bearing steel grades, tolerances, superfinishing, and the hardening process for precision wear parts.
GCr15 (52100/SUJ2/100Cr6) is a high-carbon chromium steel (C ~1%, Cr ~1.5%) through-hardened to HRC 60–64 — the highest hardness achievable in standard steel without surface carburising. The uniform fine carbide distribution provides exceptional rolling contact fatigue resistance and wear resistance. vs carburised alloy steel (20CrMnTi, HRC 58–62): GCr15 has superior through-hardness uniformity, better dimensional stability, and a harder martensitic matrix — which is why all bearing manufacturers use it for ring and rolling element production.
OD: h4 (±0.002mm) for spindle parts; h5 (±0.003–0.005mm) for guide shafts; h6 for roller shafts. Bore: H6 for bushings and bearing rings. Cylindricity: ≤0.001mm for spindle parts; ≤0.003mm for guide shafts and roller shafts. OD/bore concentricity: ≤0.003mm. Surface finish: Ra ≤0.05μm superfinished raceways; Ra ≤0.1μm guide shafts; Ra ≤0.2μm standard ground. All tolerances held după hardening — ground post-HT.
GCr15 is through-hardened by austenitising at 840–860°C then oil-quenched to achieve uniform HRC 60–64 through the cross-section. Low-temperature tempering at 150–180°C relieves quench stress while maintaining hardness. Cryogenic treatment (-80°C to -196°C) after quench converts retained austenite to martensite — important for dimensional stability in precision guide shafts and spindle parts. Heat treatment record (process parameters + hardness test per piece) included with every order.
Cylindrical grinding produces Ra ≤0.4 μm but leaves surface tensile residual stress and micro-grinding marks. Under rolling contact loading, these are the initiation sites for subsurface fatigue cracks that propagate and cause spalling. Superfinishing (honing or vibratory finishing to Ra ≤0,05 μm) removes the stressed surface layer and marks — dramatically extending rolling contact fatigue life. For bearing rings that will see 10+ million contact cycles, the difference between ground-only and superfinished raceway life can exceed 3×.
Yes — two supply states: (A) Rough-turned + hardened HRC 60–64 with ±0.3mm grinding allowance on all surfaces — ready for your grinding operations; (B) Finish-ground to OD h5, bore H6, concentricity ≤0.003mm, raceway profile ±0.005mm, with optional superfinish to Ra ≤0.05μm. Custom non-standard bearing ring sizes available with MOQ 1 piece. Mill certificate and hardness test report standard on all bearing ring orders.
A precision guide shaft (精密导向轴): OD h5, cylindricity ≤0.003mm across full length, straightness ≤0.01mm/m, Ra ≤0.1μm — all ground post-HT GCr15 HRC 60–64. Required for recirculating ball bushing linear bearing guidance. A plain shaft (光轴): typically h6 OD, Ra ≤0.4μm, without tight cylindricity or straightness specs. Substituting a plain shaft for a guide shaft in a linear bearing application typically causes variable radial clearance, bearing noise, and premature failure at the points where cylindricity deviation concentrates contact stress.
For hardened GCr15 (dimensional preservation priority): oxid negru — <0.5μm change, mild protection, preserves all ground tolerances, standard transit protection; Hard chrome — 10–30μm, HV 1000+, applied post-grind then re-ground to OD final dimension, for guide shafts and roller shafts requiring maximum wear life; Thin EN — 3–5μm electroless nickel, corrosion protection for humid environments; PVD TiN/TiAlN — 2–4μm, HV 2300–3500, abrasive environment coating. All coatings with thickness specified and post-plate dimension verified.
MOQ: 1 piesă for custom sizes. Standard lead times: simple hardened and ground parts (pin shafts, roller shafts): 7–12 working days (includes heat treatment time). Precision-ground guide shafts and bearing rings: 10–15 working days. Superfinished spindle parts and bearing ring raceways: 12–20 working days. Production quantities 50+ pieces: quoted individually. Exact lead time confirmed in every quotation.
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