Common 440C Stainless Steel Specifications & Heat Treatment
| Grade | 440C Stainless Steel |
|---|---|
| Common bar standards | ASTM A276 for stainless steel bar; UNS S44004 (440C). |
| Heat treatment / supply condition | Annealed for machining or hardened and tempered to specified hardness; final grinding needs controlled surface integrity. |
| Precision finishing | Specify finished OD and limits, rod length and quantity, straightness, roughness, hardness, and required documents. |
Verify hardness and temper before finish grinding.
Typical standards and conditions are purchasing references only, not a stock/certification or in-house heat-treat promise. Confirm supplied product form, condition and any externally coordinated thermal treatment in the written RFQ.
HIGH-CARBON MARTENSITIC STAINLESS • MATERIAL GRADE BUYING GUIDE
440C Stainless Steel precision ground rod stock — 440C is a high-carbon hardenable stainless alloy often specified for wear-related and bearing applications.
440C Stainless Steel Rod Material and Specification
For this grade, the important question is not simply whether a rod is offered as “precision ground.” Buyers should define the material identity, the intended delivery condition and the acceptance requirements. Confirm UNS S44004 where required, plus the actual procurement standard.
Condition and Processing Considerations
Specify the annealed supply state or the hardened-and-tempered acceptance condition and target hardness.
Where 440C Stainless Steel Rod Stock May Be Considered
Bearing-associated parts, wear components, shafts and precision hardware.
The required rod diameter and finish must be consistent with the final manufacturing process. Ground stock may be appropriate for selected machining or shaft-preparation workflows, but the final component design determines whether the grade, microstructure and surface condition are suitable.
440C Stainless Steel Centerless Ground & TG&P Bar Options
440C Stainless Steel Centerless Ground Bar
If you are searching for 440C Stainless Steel centerless ground rod or bar, hardened 440C requires special attention to finishing sequence, surface integrity and final hardness. Review centerless grinding services for suitable bar stock and customer-supplied material.
440C Stainless Steel TG&P / Turned, Ground & Polished
For 440C Stainless Steel TG&P (TGP) or turned, ground and polished material, TG&P is not automatically a standard offering for hardened bearing-grade 440C; verify suitability of the turning and polishing steps with the supplier. Read about shafting and bar sourcing and bar polishing.
Centerless-ground finish and TG&P are not interchangeable specifications. Supply form, process sequence, dimensional tolerances, straightness, surface finish and availability are confirmed for each grade and RFQ. Request a grade-specific quote →
What to Verify Before Ordering
Grinding after hardening requires separate consideration of residual stresses, surface integrity and roundness.
- Finished outside diameter: state the size and exact upper/lower OD limits, not just a nominal inch or millimeter dimension.
- Lengths and quantity: give the bar length or cut length, end requirements, number of pieces and requested shipment schedule.
- Material condition: include the specified grade, applicable product standard, heat-treatment or hardness state and certification requirements.
- Inspection: specify straightness with a measurement span, roundness, surface roughness and traceability where your application calls for them.
Supply, OD Grinding and Quote Requirements
Precision Ground Rods provides grade-specific sourcing and precision bar processing quotations. Depending on the grade, condition, diameter and length, material supply may be combined with outside-diameter grinding, straightening, polishing, cutting and packaging. These capabilities are evaluated for each RFQ; this page does not promise a standard stocked size or a universal grinder tolerance.
For a useful 440C Stainless Steel inquiry, attach the purchase specification and drawing and indicate whether you need finished ground rod stock or want customer-owned stock processed. Include the quantity, delivery destination and inspection plan so the quotation can address all relevant requirements.
Browse all rod material grades to compare other chemistries and product forms. Verify any material substitution with engineering.
General purchasing information, not a certified material test report or an approval for regulated service. All material properties, dimensions and certificates must be confirmed in the written quotation.
