Catégorie de produit
SST — 5 Categories · 36 Product Lines
Acier inoxydable
CNC
Pièces Usinées
36 product lines across five stainless steel categories — corrosion-resistant structural, valve & fluid, medical & food, high-strength 17-4PH/15-5PH, and hardened 420/440C. Passivation, electropolish, and ISO 10993 documentation standard.
SS316LCorrosion
Resistant
Resistant
SS304Général
Purpose
Purpose
17-4PHÉlevé
Résistance
Résistance
440CTrempé
HRC 60
HRC 60
15-5PHStable
Structure
Structure
36
Gamme de produits
EP+Pass
Standard
36
Gamme de produits
5
SS Categories
1310MPa
17-4PH H900
Ra ≤0,4μm
Électropolissage
24hr
Délai de devis
SS316L Shaft ✦
Corps de vanne ✦
Bloc collecteur ✦
Medical Handle ✦
Surgical Instrument ✦
Food Contact Part ✦
Raccord sanitaire ✦
17-4PH Structure ✦
15-5PH Connector ✦
Goupille de guidage 440C ✦
420 Tool Part ✦
SS Flange ✦
siège de buse ✦
Corps de la pompe ✦
SS316L Shaft ✦
Corps de vanne ✦
Bloc collecteur ✦
Medical Handle ✦
Surgical Instrument ✦
Food Contact Part ✦
Raccord sanitaire ✦
17-4PH Structure ✦
15-5PH Connector ✦
Goupille de guidage 440C ✦
420 Tool Part ✦
SS Flange ✦
siège de buse ✦
Corps de la pompe ✦
Gammes de produits complètes
36 Stainless Steel Parts Across
5 Product Categories
Select a category tab · SS304 · SS316L · 17-4PH · 440C · Passivated & Electropolished · MOQ 1 piece
Catégories de produits
Ten SS316L and SS304 corrosion-resistant structural parts — shafts, sleeves, flanges, fittings, fasteners, connector blocks, mounting seats, brackets, housings, and end caps. SS316L mandatory where chloride corrosion is present; SS304 for freshwater and mild chemical environments. All parts passivated per ASTM A967 as standard. Electropolish available on all parts for enhanced corrosion resistance and surface finish.
SST-001→010
CORROSION-RESISTANT / 001–010 — CATEGORY OVERVIEW
SS316L / SS304 Structural & Enclosure Parts
Complete range of SS316L corrosion-resistant structural parts: precision turned shafts (OD h6/h7, Ra ≤0.4μm), sleeves and bushings (H7 bore, OD/ID concentricity ≤0.005mm), custom flanges (bolt pattern ±0.01mm, face flatness ±0.02mm), threaded fittings (NPT/BSP/G, passivated), fastener bodies (M2–M24, hex/socket), connector blocks (face flatness ±0.01mm), mounting seats (spigot H7, face perpendicularity ≤0.01mm), brackets, housings with O-ring groove per ISO 3601, and end caps with sealing face flatness ±0.01mm. All parts passivated per ASTM A967 as standard. Material certificate with chemical composition. Electropolish available for any part in this category — upgraded to Ra ≤0.4μm surface finish with improved passivation.
SS316L · SS304 · SS303Obtenir un devis
SST-001/002
CORROSION / 001–002
SS Shafts & Sleeves
Precision SS316L/SS303 shafts (h6/h7, Ra ≤0.4μm) and sleeves (H7 bore, concentricity ≤0.005mm). SS303 for turned-only parts needing best finish; SS316L where corrosion resistance is paramount. Swiss-type turning for Ø1–Ø20mm. Passivated standard.
SS316L · SS303 · SS304Obtenir un devis
SST-003→006
CORROSION / 003–006
SS Flanges, Fittings & Connectors
Custom SS316L flanges (bolt pattern ±0.01mm), threaded fittings (NPT/BSP/G, pressure-tested), fastener bodies (M2–M24), and connector blocks (face flatness ±0.01mm). All passivated ASTM A967. Thread go/no-go inspected.
SS316L · SS304Obtenir un devis
SST-007→010
CORROSION / 007–010
SS Mounts, Brackets, Housings & Caps
SS316L mounting seats (H7 spigot, face perp ≤0.01mm), brackets (any profile), machined housings (IP-rated sealing groove), and end caps (O-ring groove per ISO 3601, face flatness ±0.01mm). Passivated. Electropolish on request.
SS316L · SS304Obtenir un devis
Matériaux : SS316L · SS316 · SS304 · SS303 · SS303 SE
Request All 10 →
Ten SS316L valve and fluid control parts — valve bodies, spools, seats, pump bodies, nozzles, nozzle seats, flow control orifices, pipe fittings, push-fit connectors, and manifold blocks. All fluid-contact surfaces passivated or electropolished. Orifice diameter tolerance ±0.002mm; valve seat cone angle ±0.1°; manifold multi-port drilling with CMM multi-feature report. Pressure testing at 1.5× WP available on request.
SST-020
VALVE & FLUID / 020 — FEATURED
SS316L Manifold Blocks
Multi-port SS316L hydraulic and pneumatic manifold blocks for custom fluid distribution systems — replacing manifold assemblies with individual fittings and reducing leak points. Port drilling from multiple face directions in a single 5-axis CNC setup to maintain inter-port position accuracy and eliminate cross-drilling burrs. Threaded port inserts: NPT, BSP, G-thread, or SAE straight thread. Internal passage intersections deburred and verified by borescope before delivery. Pressure rating to customer drawing — all manifold blocks hydraulic pressure-tested at 1.5× WP with test certificate. Electropolished internal passages Ra ≤0.4μm for corrosion resistance and cleanability. CMM multi-feature dimensional report: all port positions, face flatness, and thread depth verified. Custom size up to 300×200×150mm as standard.
SS316L · SS316 · Duplex 2205Obtenir un devis
SST-011→013
VALVE / 011–013
Valve Bodies, Spools & Seats
SS316L valve bodies (threaded/flanged port, any pressure), valve spools (OD h6, O-ring groove per ISO 3601, Ra ≤0.4μm), and valve seats (seating cone ±0.1°, Ra ≤0.2μm sealing face). Passivated or electropolished. All threads go/no-go inspected.
SS316L · SS316Obtenir un devis
SST-015→017
VALVE / 015–017
Nozzles & Flow Control Parts
SS316L spray nozzles (orifice ±0.002mm, Ra ≤0.1μm bore), nozzle seat bodies (cone ±0.1°), and precision flow control orifice inserts (orifice ±0.002mm, electropolished). Consistent flow coefficient between parts. Passivated or electropolished.
SS316L · SS304Obtenir un devis
SST-014,018→019
VALVE / 014, 018–019
Pump Bodies, Pipe Fittings & Push-Fits
SS316L pump bodies (bore H7, Ra ≤0.4μm), threaded pipe fittings (NPT/BSP/G, pressure-tested), and push-fit connector bodies (bore H8, Ra ≤0.4μm, O-ring groove). Passivated. Pressure test certificate on request.
SS316L · SS316Obtenir un devis
Matériaux : SS316L · SS316 · Duplex 2205 · SS304
Request All 10 →
Seven SS316L medical device and food equipment parts — medical instrument handles, device housings, surgical instrument components, precision gripping parts, food-contact parts, sanitary fittings, and inspection instrument components. All electropolished to Ra ≤0.4 μm. ISO 10993 documentation available. EHEDG/3-A compliant geometry (crevice-free, R≥1.5mm internal corners). SS316L per ASTM F138 (implant grade) or ASTM A276 (surgical grade) depending on application.
SST-026
MEDICAL & FOOD / 026 — FEATURED
Sanitary Fittings & Food-Contact Parts
SS316L sanitary fittings (DIN 11851, BS 4825/SMS standard profiles) and custom food-contact equipment parts for dairy, beverage, pharmaceutical, and food processing applications. Material SS316L per ASTM A276 or ASTM A479 with sulphur content ≤0.005% for best electropolish surface quality. Electropolished to Ra ≤0.4 μm — EHEDG and 3-A Sanitary Standard compliant surface finish. Crevice-free design: all internal corners with radius ≥R1.5 mm to prevent bacterial micro-colonies from forming; no dead legs; all threads full-form with no partial thread entry points. Passivated per ASTM A967 after electropolish. Certificate of conformance supplied. Clamp ferrule, union, and elbow fitting profiles also available from drawing.
SS316L ASTM A276 (low S)Obtenir un devis
SST-021→023
MEDICAL / 021–023
Medical Handles, Housings & Surgical Parts
SS316L medical instrument handles (electropolished, ISO 10993), device housings (IP sealing groove, EP), and surgical instrument parts (SS420/SS316L, passivated or EP). Material cert per heat number. Ra ≤0.4μm documented by profilometer. ISO 10993 biocompatibility documentation supplied.
SS316L ASTM F138 · SS420Obtenir un devis
Matériaux : SS316L ASTM F138 · SS316L ASTM A276 · SS420 · SS304 (food select)
Demandez Tout 7 →
Six 17-4PH (H900/H1025) and 15-5PH (H900) high-strength stainless steel parts — structural parts, shaft components, high-strength mounting seats, aerospace connectors, precision actuator bodies, and stable structural components. 17-4PH H900: 1310 MPa UTS, HRC 40, corrosion resistance ≈ SS304. Age-hardening applied after machining — minimal distortion (0.05–0.1%), allowing tight-tolerance machining before hardening. 5-axis CNC for multi-face aerospace connectors. Full GD&T CMM report available.
SST-031
17-4PH / 028–033 — FEATURED
17-4PH Aerospace & High-Strength Connectors
17-4PH (ASTM A564 Grade 630) aerospace-grade structural connectors and high-strength actuation parts in H900 (HRC 40, 1310 MPa) or H1025 (HRC 35, 1000 MPa) condition. Machined to near-net dimensions in the solution-annealed (Condition A) state — easy to machine, minimal tool wear. Age-hardened after machining with dimensional change typically 0.05–0.1% — much lower distortion than Q&T hardening of alloy steel. Bearing seat OD tolerance k6/h6 maintained after age-hardening due to low distortion. 5-axis CNC for multi-face connector parts. Bore coaxiality ≤0.005mm. Full GD&T CMM report: bore diameter, roundness, coaxiality, perpendicularity — standard on all aerospace connector orders. Passivated per ASTM A967. Material per AMS 5643 (bar/billet) or ASTM A564 — aerospace material certificate on request.
17-4PH (630) · 15-5PH (632)Obtenir un devis
SST-028→030
17-4PH / 028–030
17-4PH Structural Parts & Shafts
17-4PH H900 precision structural parts (face flatness ±0.01mm, CMM report), shaft parts (bearing seat k6, TIR ≤0.01mm), and high-strength mounting seats (H7 spigot, face flatness ±0.01mm). All age-hardened after machining. Passivated.
17-4PH H900/H1025Obtenir un devis
SST-032→033
17-4PH / 032–033
Precision Actuator Parts & 15-5PH Structures
17-4PH H900 precision actuator bodies (bore H6, coaxiality ≤0.005mm, 5-axis) and 15-5PH H900 stable structural parts (1170 MPa, better toughness than 17-4PH, CMM GD&T report). Both passivated, material cert included.
17-4PH H900 · 15-5PH H900Obtenir un devis
Matériaux : 17-4PH (630) AMS 5643 / ASTM A564 · 15-5PH (632)
Demandez tous les 6 →Capacité de fabrication
What Stainless Steel Parts Require
Au-delà de l'usinage CNC standard
⚗
Electropolish — Ra ≤0.4μm + Superior Passivation
Electropolishing removes 10–30μm of material, producing Ra ≤0.4μm surface and a chromium-enriched oxide layer with superior corrosion resistance compared to passivation alone. Standard for medical, food contact, and valve bore surfaces. Surface finish measured by profilometer and documented for all electropolished parts.
🔬
ISO 10993 Documentation — Medical Grade
SS316L per ASTM F138 (implant-grade) or ASTM A276 (surgical-grade) with mill certificate per heat number. Surface treatment certificate (electropolish or passivation). Ra measurement documented by profilometer. ISO 10993 framework manufacturing documentation package supplied — required to initiate biological evaluation.
💧
Manifold Block — Pressure Tested 1.5×WP
Manifold blocks hydraulic pressure tested at 1.5× working pressure with test certificate. Internal passages electropolished Ra ≤0.4μm, deburred by borescope. Multi-port position CMM verified. All port threads go/no-go inspected. Dead-leg-free passage routing confirmed at DFM review.
💪
17-4PH Age-Harden — Low Distortion, 1310 MPa
17-4PH machined in Condition A (annealed, easy to machine), then age-hardened to H900 or H1025. Age-hardening distortion typically 0.05–0.1% — much lower than Q&T hardening of alloy steel. Bearing seats and bores maintain h6/H6 tolerance after age-hardening without secondary grinding in most cases. Age-hardening record included.
🥗
EHEDG / 3-A Food-Safe Geometry
Sanitary parts machined with crevice-free geometry: all internal corners R≥1.5mm, no dead legs, full-form threads, no partial thread engagement points. SS316L with sulphur content ≤0.005% for best electropolish result. Geometry reviewed for EHEDG and 3-A standard compliance at DFM stage.
🔩
440C Post-Grind Passivation — Corrosion Restored
Cylindrical grinding removes the passive chromium oxide layer from 440C stainless surfaces. All 440C parts passivated immediately after final grinding — restoring the corrosion-resistance passive layer before delivery. Without post-grind passivation, ground stainless surfaces rust within days in humid environments.
Spécifications de précision
Tolérances & Référence de Grade — Pièces en acier inoxydable
📐
Tolérances par Fonctionnalité
Shaft OD (turned)
h6 / h7
440C Shaft (ground)
h6
Alésage (H)
H6 / H7
Cône de siège de soupape
±0,1°
Orifice de buse
±0,002 mm
Coax. d'articulation de robot.
≤0,005 mm
Surface (EP)
Ra ≤0,4 μm
Dim. générale.
±0,05 mm
🔩
Grade & Strength Reference
SS316L UTS
515 MPa
Corrosion-resistant standard. Best Mo-enhanced chloride resistance. Passivated / electropolished.
17-4PH H900
1310 MPa
Precipitation hardened. Low distortion age-hardening. ≈SS304 corrosion resistance.
15-5PH H900
1170 MPa
Better toughness than 17-4PH. Aerospace structural applications.
440C Hardened
HRC 58–60
Hardest standard stainless. Wear + moderate corrosion resistance. Ground post-HT.
420 Hardened
HRC 48–55
Better toughness than 440C. Surgical instruments and impact-loaded tool parts.
Electropolish Ra
≤0.4μm
Medical, food, and valve bore standard. Measured by profilometer and documented.
Traitements de surface
Finition de surface pour Pièces en acier inoxydable
Surface treatment selection for stainless steel determines corrosion resistance, surface finish, and application compliance — not just appearance.
⚗
Electropolissage (EP)
Ra ≤0.4μm, chromium-enriched passive layer, bright reflective finish. Required for medical, food-contact, and precision valve bore surfaces. 10–30μm material removal. Ra documented by profilometer. Standard on all medical and food parts.
MédicalFood / Valve
🛡
Passivation (ASTM A967)
Citric acid or nitric acid passivation restores chromium passive oxide layer — improving corrosion resistance on machined stainless surfaces. Certificate included. Standard on all SS316L and SS304 parts. Essential after grinding operations on 440C and 420 (grinding removes passive layer).
Toutes les qualités d'acier inoxydable440C / 420
🔲
As-Machined + Oil
Precision machined Ra ≤0.4μm turned surface with corrosion-inhibitor oil coating for transit protection. Not a corrosion-resistance treatment — for parts that will be installed without additional surface treatment. Passivation recommended before final use in all applications.
Transit only
✦
Vibratory Polishing
Vibratory media polishing of external stainless steel surfaces — blends machined marks to produce consistent matte or semi-bright finish. Used for cosmetic stainless housings and brackets where visible surface uniformity is required. Ra 0.4–0.8μm achievable depending on media and time.
CartersSupports
💎
PVD TiN / TiAlN
2–4μm PVD coating on 440C and 420 stainless tool and wear parts — adds HV 2300+ surface hardness and reduces friction without compromising corrosion resistance. Used for surgical blades, guide pins, and tool parts requiring both hardness and corrosion resistance beyond what passivation provides.
440C / 420Chirurgical
🌟
Mirror Polish (Ra ≤0.1μm)
Manual mirror polishing to Ra ≤0.1μm for visible stainless steel surfaces on medical instruments and food equipment where appearance requirements exceed electropolish standard. Labour-intensive — quoted individually. Not a substitute for electropolish on fluid-contact bores.
Medical externalCosmetic
Choix des matériaux
Stainless Steel Grades for Chaque application
Five stainless steel grade families — each optimised for a different combination of corrosion resistance, strength, and hardness.
MAT / 01
SS316L / SS316
515 MPa · 2% Mo · Best chloride resistance
Universal choice for corrosion-resistant CNC parts. Molybdenum (2–3%) provides far superior chloride pitting resistance vs SS304. Mandatory for marine, chemical, pharmaceutical, and food processing applications. Electropolished for medical and food-contact use.
MAT / 02
SS304 / SS303
515 MPa · No Mo · General purpose
Standard austenitic stainless for freshwater, mild chemical, and indoor environments where chloride is absent. SS303 (sulphur-enhanced) for best machinability on turned parts. SS304 for welded and formed parts. Do not use in chloride environments — specify SS316L.
MAT / 03
17-4PH (630)
1310 MPa H900 · HRC 40 · Low HT distortion
Best strength-to-corrosion-resistance combination in stainless steel family. Machine in Condition A then age-harden — minimal distortion allows tight tolerances before HT. AMS 5643 material for aerospace. H900 for max strength; H1025 for better toughness.
MAT / 04
15-5PH (632)
1170 MPa H900 · Better toughness than 17-4PH
Similar precipitation-hardening stainless to 17-4PH but with improved transverse toughness — preferred for aerospace connectors and structural parts subject to shock loading. H900 condition standard. Good machinability in Condition A.
MAT / 05
SS440C
HRC 58–60 · Hardest standard stainless
<<div class="mat-card__desc">Maximum hardness in standard stainless — guide pins, rollers, valve spools requiring wear resistance in moist environments where GCr15 would corrode. Through-hardened HRC 58–60. Ground post-HT; passivated post-grind. Better corrosion resistance than tool steels but less than austenitic SS.Flux de production
De dessin à Electropolished, Certified Stainless Part
01
Revue DFM
Grade, EP vs passivation, ISO 10993 scope, crevice-free geometry confirmed. 24hr response.
02
Matériau
SS316L / 17-4PH / 440C receipted with mill certificate per heat number. Grade verified.
03
Usinage CNC
Machined to net dimension. Crevice-free geometry maintained for medical/food parts. Manifold passages borescope-deburred.
04
Traitement thermique
17-4PH age-hardening (H900/H1025) or 440C/420 through-hardening where specified. Record generated.
05
Traitement de surface
Electropolish (Ra profilometer measured) or passivation per ASTM A967. Certificate generated. Surface documented.
06
Contrôle et livraison
CMM inspection. Mat cert + EP/passivation cert + Ra record. ISO 10993 docs for medical. Clean-room pack.
Notre Avantage
Pourquoi les ingénieurs spécifient nos Pièces en acier inoxydable
EP
Electropolish Ra ≤0.4μm — Measured, Documented
Every electropolished part Ra-measured by profilometer before delivery. Ra ≤0.4μm documented in surface treatment certificate — not claimed from process control alone. For medical and food parts where surface finish is a regulatory requirement, documentation is not optional.
316L
SS316L Always Specified Where Chloride Exists
We default to SS316L (not SS304) wherever chloride corrosion is a risk — marine, pharmaceutical, chemical, and outdoor applications. The molybdenum addition that differentiates 316L from 304 is specifically there for chloride pitting resistance. We advise on grade selection at DFM review — not just machine what is specified without comment.
EHEDG
Food-Safe Geometry — Crevice-Free, R≥1.5mm
Food and sanitary parts designed with EHEDG/3-A compliant geometry: internal corners R≥1.5mm, no dead legs, full-form threads. SS316L with low sulphur content for best electropolish result. Geometry compliance reviewed at DFM stage — not discovered after machining when correction requires a new part.
440C
440C Post-Grind Passivated — Always
440C and 420 stainless parts passivated immediately after final cylindrical grinding — restoring the passive layer removed by grinding. Most suppliers omit this step. Ground martensitic stainless without post-grind passivation develops visible rust spots within days in humid environments — a defect that appears after delivery and is attributed to material, not omitted passivation.
Foire aux questions
Stainless Steel CNC Parts — Questions fréquentes
Technical questions about stainless steel grades, surface treatments, medical documentation, and valve machining.
SS316L is the default for any environment with chloride present (marine, chemical, pharmaceutical, food). Molybdenum (2–3%) provides far superior chloride pitting resistance vs SS304. SS304 is acceptable for freshwater and mild chemical environments without chloride. For high-strength + corrosion resistance: specify 17-4PH or 15-5PH — 1000–1310 MPa while maintaining ≈SS304 corrosion resistance. For hardness + moderate corrosion resistance: SS440C (HRC 58–60) or SS420 (HRC 48–55).
Electropolishing removes 10–30 μm of material, producing Ra ≤0,4 μm surface finish and a chromium-enriched passive oxide layer with superior corrosion resistance vs passivation alone. Required for: medical device parts (ISO 10993 — surface must resist protein adhesion and sterilisation); food-contact parts (EHEDG/3-A — Ra ≤0.8 μm minimum, electropolish achieves ≤0.4 μm and eliminates micro-crevices); and precision flow bores where consistent flow coefficient between parts is required. We measure Ra by profilometer and document in the surface treatment certificate.
17-4PH (ASTM A564 Grade 630) is a precipitation-hardening stainless steel achieving 1310 MPa UTS in H900 condition — machined in the soft Condition A, then age-hardened at 480°C with only 0.05–0.1% dimensional change. This is far lower distortion than Q&T hardening of alloy steel — bearing seats machined to h6 before age-hardening typically remain within specification after hardening without secondary grinding. Corrosion resistance ≈ SS304. For aerospace and high-load structural parts requiring stainless corrosion resistance AND high strength, 17-4PH is the standard choice. AMS 5643 material certificate available.
SS420 (HRC 48–55): lower carbon, better toughness — for surgical instruments and tool parts requiring impact resistance. SS440C (HRC 58–60): higher carbon (0.95–1.2%), best hardness of standard stainless — for guide pins, rollers, valve spools requiring maximum wear resistance in moist environments. Key trade-off: 440C harder but less tough than 420; both have worse corrosion resistance than 316L in active chloride environments. Choose 420 for toughness + moderate hardness; choose 440C for maximum hardness + moderate corrosion resistance.
EHEDG (European): SS316L, Ra ≤0.8μm (we supply Ra ≤0.4μm), crevice-free geometry. 3-A Sanitary Standards (USA): SS316L, Ra ≤0.8μm, no crevices. DIN 11851 (German dairy fittings) and BS 4825 / SMS (British/Scandinavian): fitting dimension standards. All our food parts: SS316L low-sulphur, electropolished Ra ≤0.4μm, internal corners R≥1.5mm, no dead legs, passivated per ASTM A967, certificate of conformance supplied.
Complete SS316L valve and fluid range: valve bodies (threaded/flanged, any pressure, passivated); spools (h6, O-ring groove per ISO 3601, Ra ≤0.4μm); seats (cone ±0.1°, Ra ≤0.2μm); pump bodies (H7 bore, Ra ≤0.4μm); nozzles (orifice ±0.002mm, Ra ≤0.1μm EP); manifold blocks (multi-port 5-axis, pressure tested 1.5×WP, CMM report); and fittings (NPT/BSP/G, passivated). Pressure testing at 1.5× WP with test certificate on request.
Yes. For medical SS parts: material mill certificate (SS316L per ASTM F138 implant-grade or ASTM A276 surgical-grade, chemical composition per heat number); surface treatment certificate (electropolish or passivation per ASTM A967); Ra measurement documented by profilometer for all medical parts; and ISO 10993-1 manufacturing documentation package (material grade, surface treatment, manufacturing process data) required to initiate biological evaluation. We do not supply finished biological evaluation reports — these require biological testing. All documentation prepared in parallel with production — no additional lead time.
MOQ : 1 pièce for all stainless parts. Lead times: simple turned parts (shafts, sleeves, fittings): 5–10 jours ouvrables. Complex milled parts (valve bodies, manifold blocks, housings): 7–14 jours ouvrables. EP or passivation: ajouter 3–5 jours ouvrables. 17-4PH age-hardening: ajouter 3–5 jours ouvrables. 440C/420 hardening + grinding: ajouter 5–7 jours ouvrables. Medical documentation: prepared in parallel — no additional lead time. Exact lead time confirmed in every quotation.
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