Overview
SUS440C (UNS S44004 / DIN 1.4125) machined fittings for rollers — the highest-hardness stainless steel (58–60 HRC) used for precision roller bearings, guide rollers and cam followers in corrosive and hygienic environments. As a specialized SUS440C roller fittings supplier, Vertex Alloy CNC-machines roller races, guide rollers, cam followers, roller shafts and sleeves per your drawing or sample (reverse engineering available) to ±0.005 mm, with ground raceways Ra 0.2–0.8, sub-zero treatment for dimensional stability, 100% dimensional and hardness inspection, full heat-number traceability and EN 10204 3.1 certificates. Where 52100 (SUJ2) bearing steel rusts in washdown and humidity, 440C keeps running — the standard choice for food-grade, pharmaceutical, marine and medical roller bearings. MOQ from 1 piece; all major OEM brands supported. Send your drawings or samples for a fast quotation.
Description (English)
SUS440C (UNS S44004, DIN 1.4125) high-hardness martensitic stainless steel machined fittings and wear parts for rollers. After quench and temper, 440C reaches 58–60 HRC — the highest hardness of any stainless steel — combined with good corrosion resistance, making it the preferred material for precision roller bearings, guide rollers and cam followers that must run in corrosive or hygienic (food / pharma / marine) environments where 52100 (SUJ2) bearing steel would rust. Vertex Alloy CNC-machines 440C roller races, guide rollers, cam followers, roller shafts, sleeves and retainers per your drawing or sample (reverse engineering from used OEM parts available), to ±0.005 mm with ground raceways Ra 0.2–0.8, sub-zero treatment for dimensional stability, 100% dimensional and hardness inspection, and full heat-number traceability. Every order ships with EN 10204 3.1 certificates, dimensional reports and hardness reports. MOQ from 1 piece; food, beverage, pharmaceutical, marine, textile, printing, aerospace and medical applications supported.
Applications
SUS440C Fittings for Roller Supplier | 440C Stainless Steel S44004 Roller Bearing Parts is supplied for demanding applications such as Bearings, Food & Beverage, Pharmaceutical, Marine, Textile & Printing, Aerospace, and Medical / Dental. These application areas rely on a carefully specified metal product that can be selected by grade, form, dimensions, and service requirements rather than by a generic material description. The listed applications provide practical context for engineers and purchasing teams reviewing this product: they indicate where corrosion resistance, strength, fabrication performance, or dimensional consistency may matter. Final suitability depends on the operating environment, design code, temperature, media, joining method, and applicable inspection requirements. Buyers can use the application information together with the grade and property data below to request a technically appropriate specification, finish, tolerance, and quantity from Vertex Alloy.
Key Mechanical & Physical Properties
SUS440C Fittings for Roller Supplier | 440C Stainless Steel S44004 Roller Bearing Parts is described using the available technical records rather than an assumed specification. The supplied data includes mechanical data including key 2e6cbbd0ddff, type mech_item, property Tensile Strength, value ≥ 1970 MPa (hardened), mechanical data including key 3347a46702ce, type mech_item, property Yield Strength, value ≥ 1900 MPa (hardened), mechanical data including key 96993daa16e0, type mech_item, property Elongation, value ≥ 2 % (hardened), mechanical data including key 3e4cb5a8d21f, type mech_item, property Hardness, value 58 – 60 HRC (quench + temper), mechanical data including key 09caab13a494, type mech_item, property Impact Energy (annealed), value ≥ 16 J (Charpy V), mechanical data including key 877f8139c80a, type mech_item, property Hardness (annealed), value ≤ 269 HB (for machining), physical data including key 1b0324c57c20, type phys_item, property Density, value 7.80 g/cm³, physical data including key 692c27c178f8, type phys_item, property Melting Range, value 1370 – 1400 °C, physical data including key 311859a71132, type phys_item, property Specific Heat Capacity, value 460 J/(kg·K), physical data including key 346bf4f2dd5a, type phys_item, property Thermal Conductivity, value 24.2 W/(m·K), physical data including key 34d5ad1557c9, type phys_item, property Electrical Resistivity, value 0.60 μΩ·m, physical data including key 069b9dae02dc, type phys_item, property Elastic Modulus, value 200 GPa, physical data including key b583dafe097e, type phys_item, property Thermal Expansion (20–100 °C), value 10.2 × 10⁻⁶ /K, physical data including key 676d18a4d575, type phys_item, property Magnetic, value Yes (ferromagnetic), composition data including key 5e6c3c4b52ef, type composition_item, element C, value 0.95 – 1.20, composition data including key fcaa8f346efb, type composition_item, element Cr, value 16.0 – 18.0, composition data including key 99dd39fad633, type composition_item, element Mo, value 0.40 – 0.80, composition data including key ca71ffa12e86, type composition_item, element Mn, value ≤ 1.00 , composition data including key 40951aabd3c8, type composition_item, element Silicon (Si) , value ≤ 1.0, composition data including key b077a86bff02, type composition_item, element Phosphorus (P) , value ≤ 0.040, composition data including key f2d968930ff0, type composition_item, element Sulfur (S) , value ≤ 0.030, and composition data including key aa69b9639d0e, type composition_item, element Iron (Fe), value Balance. Keeping these values visible helps a technical buyer compare the product with a drawing, purchase specification, or applicable standard before requesting a quotation. Mechanical values can guide early checks for strength and forming requirements, while physical values and composition details help with material identification, process planning, and service-environment review. Values should be confirmed against the latest mill certificate, heat or lot documentation, product condition, test method, and governing standard before production use. Vertex Alloy can review the required performance range and clarify which supplied values apply to the requested size and delivery condition.
Available Sizes & Forms
SUS440C Fittings for Roller Supplier | 440C Stainless Steel S44004 Roller Bearing Parts is listed in others form with size information including Part Size (max envelope):Up to 300 mm diameter × 400 mm length, Bar Stock Diameter:3 – 300 mm (ASTM A276), Tolerance:Up to ± 0.005 mm (ground), Surface Finish:Ra 0.2 – 0.8 (ground raceways), and Order Quantity:1 piece to series production. The size range is intended to help buyers screen availability and prepare an enquiry; it is not a substitute for a confirmed production schedule or tolerance agreement. When requesting this product, include thickness or diameter, width or length, cut-to-size needs, edge condition, surface finish, straightness, tolerance, quantity, and preferred packing. Dimensions may vary with grade, processing route, minimum order quantity, and mill capacity. Sharing the complete requirement allows Vertex Alloy to check whether the requested size can be supplied directly, cut from stock, or produced to order. The final commercial confirmation should state the agreed form, dimensions, tolerances, condition, inspection documents, and delivery terms.
Grade Compliance
SUS440C Fittings for Roller Supplier | 440C Stainless Steel S44004 Roller Bearing Parts carries the recorded grade references UNS (USA) S44004, AISI (USA) 440C, DIN / EN (Germany/EU) 1.4125 / X105CrMo17, JIS (Japan) SUS440C, GB (China) 102Cr17Mo / 9Cr18Mo, BS (UK) 440C / 110CrMo17, and AFNOR (France) Z100CD17. These references give engineering and procurement teams a starting point for checking material identity, equivalent designations, and documentation requirements. A grade reference should always be read together with its applicable standard, product form, dimensional range, delivery condition, heat treatment, testing requirements, and revision level. Equivalent designations are not automatically interchangeable in every service, so the governing project specification remains controlling. Before order placement, confirm the required standard and certificate format, including chemical, mechanical, visual, dimensional, and any special testing requirements. Vertex Alloy can help compare the requested designation with the available product record and identify details that need confirmation from the producing mill.
Size Range
- Part Size (max envelope):Up to 300 mm diameter × 400 mm length
- Bar Stock Diameter:3 – 300 mm (ASTM A276)
- Tolerance:Up to ± 0.005 mm (ground)
- Surface Finish:Ra 0.2 – 0.8 (ground raceways)
- Order Quantity:1 piece to series production
Grade Specification
| System | Value |
|---|---|
| UNS (USA) | S44004 |
| AISI (USA) | 440C |
| DIN / EN (Germany/EU) | 1.4125 / X105CrMo17 |
| JIS (Japan) | SUS440C |
| GB (China) | 102Cr17Mo / 9Cr18Mo |
| BS (UK) | 440C / 110CrMo17 |
| AFNOR (France) | Z100CD17 |
Chemical Composition
| Element | Value |
|---|---|
| C | 0.95 – 1.20 |
| Cr | 16.0 – 18.0 |
| Mo | 0.40 – 0.80 |
| Mn | ≤ 1.00 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties
| productCenter.property | Value |
|---|---|
| Tensile Strength | ≥ 1970 MPa (hardened) |
| Yield Strength | ≥ 1900 MPa (hardened) |
| Elongation | ≥ 2 % (hardened) |
| Hardness | 58 – 60 HRC (quench + temper) |
| Impact Energy (annealed) | ≥ 16 J (Charpy V) |
| Hardness (annealed) | ≤ 269 HB (for machining) |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | g/cm³ | 7.80 g/cm³ |
| Melting Range | °C | 1370 – 1400 °C |
| Specific Heat Capacity | J/kg·K | 460 J/(kg·K) |
| Thermal Conductivity | W/m·K | 24.2 W/(m·K) |
| Electrical Resistivity | μΩ·cm | 0.60 μΩ·m |
| Elastic Modulus | GPa | 200 GPa |
| Thermal Expansion (20–100 °C) | ×10⁻⁶/K | 10.2 × 10⁻⁶ /K |
| Magnetic | - | Yes (ferromagnetic) |
Applications
- Bearings
- Food & Beverage
- Pharmaceutical
- Marine
- Textile & Printing
- Aerospace
- Medical / Dental