Material selection · Roller screw components
100Cr6 (1.3505) is a through-hardening bearing steel. Screen temperature and environment below, then confirm grade, cleanliness, heat treatment, and duty against component data.
Request an engineering reviewThese references describe bearing steels and bearing products. They give selection context, not a rated operating envelope for a roller screw assembly.
58–62 HRC
SKF lists this range for some 52100/100Cr6 bearing rings. The specified hardness for a screw, nut, or roller must follow its section size, heat treatment, measurement location, and design.
Reference: SKF bearing data
120–200°C
SKF gives different maximum temperatures for standard bearing designs based on heat treatment. Stabilization can extend some bearing applications, with a load-rating reduction. Do not use these as roller-screw limits.
Reference: SKF temperature guidance
Specify cleanliness
100Cr6 is supplied in variants with different cleanliness and inclusion characteristics. State the required quality and evidence in the purchase specification; a process label alone does not define fatigue performance.
Reference: Ovako 100Cr6 data
ISO 683-17:2023 covers delivery requirements for several groups of ball and roller bearing steels, including through-hardening grades. Confirm the material standard, product condition, and order requirements on the actual mill certificate.
| Element | Example mass fraction | Element | Example mass fraction |
|---|---|---|---|
| Carbon (C) | 0.93–1.05% | Chromium (Cr) | 1.35–1.60% |
| Manganese (Mn) | 0.25–0.45% | Silicon (Si) | 0.15–0.35% |
| Phosphorus (P) | ≤ 0.025% | Sulfur (S) | ≤ 0.015% |
Example values from the Swiss Steel Group 1.3505 / 100Cr6 data sheet. Product standard, steelmaking route, and heat analysis can change the values and requirements for a specific order.
A Schaeffler roller-screw selection guide lists 100Cr6 for a pretreated, induction-hardened special shaft and for through-hardened nuts and rollers. It gives 59–63 HRC for the listed special shaft, 58–62 HRC for the nuts and rollers, and a maximum operating temperature of 180°C for those configurations. These are supplier catalog values for specific designs, not general 100Cr6 limits or approval for another screw.
Reference: Schaeffler Roller Screws selection guide (TPI 291, p. 20)
1 · Identity
Standard, grade, product form, heat number, and chemistry certificate.
2 · Heat treatment
Hardness target, test location, section size, and dimensional stability requirements.
3 · Cleanliness
Required inclusion/cleanliness evidence and any agreed bearing-quality variant.
4 · Application
Load, contact geometry, speed, duty cycle, lubricant, contamination, and environment.
Comparing a specific shaft, nut, or roller route? Request a drawing and duty review with the component geometry and operating conditions.
Compare a material change against the full component design. There is no reliable universal percentage conversion for load capacity between these grades.
| Option | Supported advantage | Boundary to verify | Next check |
|---|---|---|---|
| 100Cr6 / 1.3505 | Through-hardening bearing steel for rolling-contact and high-fatigue applications. | Corrosion protection, cleanliness, heat treatment, and contact stress are application-specific. | Confirm grade, certificate, hardness map, and validated life model. |
| 440C stainless | SKF lists good corrosion resistance for 440C bearing components. | Hardness and capacity depend on product and heat treatment; do not carry over 100Cr6 ratings. | Recheck contact stress, wear, life, and corrosion conditions for the chosen part. |
| M50 bearing steel | Used for bearing applications needing stable hardness at elevated temperature. | Not a drop-in substitute; processing, corrosion protection, and geometry still need review. | Ask a materials engineer to review temperature, time, and load together. |
| Coated 100Cr6 | A coating may address a defined surface requirement. | Coating thickness, adhesion, flank geometry, and rolling-contact fatigue require process-specific validation. | Qualify the coating on the actual contact surface and inspect finished dimensions. |
Price depends on cleanliness level, heat treatment, finishing, inspection, order quantity, and supplier. Request a quote against the same drawing and quality requirements before comparing options.
ISO 281 defines dynamic load ratings and rating-life methods for rolling bearings within its stated product and design scope. Its life result depends on more than steel grade, including bearing design, loading, lubrication, and contamination. A roller screw has its own contact geometry and system conditions; applying a bearing rating-life equation to a roller screw without a validated model is an engineering inference, not an ISO 281 rating. Confirm the model and assumptions with the component supplier.
Reference: ISO 281 scope and status · ISO lists the 2007 edition as under revision when checked on 30 September 2026.
They are related bearing-steel designations, not a substitute for checking the governing standard. Compare chemistry limits, product condition, cleanliness, and the mill certificate for the actual heat.
It is a range listed for some bearing rings and specific roller-screw configurations, not a universal roller-screw component specification. Define hardness and test location for the actual geometry and heat treatment.
No single temperature applies to every design. A Schaeffler roller-screw guide lists certain 100Cr6 shaft, nut, and roller configurations up to 180°C. That is a product-specific catalog limit, not a general grade rating; verify the exact component, lubrication, and duty.
No. Grade and cleanliness matter, but life also depends on contact geometry, load spectrum, surface condition, heat treatment, lubrication, contamination, and the model used.
Treat both as application reviews. Washdown needs a corrosion plan; vacuum and cleanroom use also need lubricant outgassing, cleanliness, and process checks. A material name alone cannot approve either condition.
Send the drawing and operating envelope. Agree the material standard, heat-number chemistry certificate, cleanliness evidence, heat-treatment and hardness requirements, dimensional inspection, and any requested EN 10204 3.1 documentation in the purchase terms.
Content and cited sources reviewed 30 September 2026. Published by Micro Roller Screw. This guide summarizes public standards and supplier data; it does not report in-house material tests. Standards and product guidance can change, so confirm the current edition and exact supplier specification before purchase or design release. The checker is a preliminary screen and does not replace engineering calculations or supplier approval.
Share the drawing, load and duty profile, temperature, environment, and material documentation requirements to request an engineering review.
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