440C Stainless Steel per NHBB SM3
The NHBB SM3 is a specification that pertains to the use of 440C stainless steel for precision bearing assemblies and aerospace components. This specification is highly demanding in terms of metallurgical and mechanical properties to ensure that components have excellent fatigue life, dimensional stability, and surface integrity.
Typical Applications of NGBB SM3
NHBB SM3 440C Stainless Steel is utilized in:
- Aerospace precision bearings and races
- Rotor and spindle assemblies
- Control actuators and servo mechanisms
- Medical and miniature bearing systems
- High-speed aerospace and instrumentation components
What is 440C Stainless Steel ?
440C is a high carbon martensitic stainless steel that has slightly more carbon than 440A and 440B giving it the highest hardness of any martensitic stainless alloy. This grade has excellent wear resistance making it perfect as a bearing steel used as ball bearings and bearing races.
440 STAINLESS STEEL SPECIFICATIONS
440A Stainless Steel
440A is a high-carbon martensitic stainless steel, AOD melted for refined quality and consistency. It contains slightly less carbon than 440B and 440C
440C Stainless Steel
440C is the hardest and most wear-resistant grade in the 440 series due to its highest carbon content. It achieves excellent dimensional stability and superior bearing performance after hardening.
Certified Material for Critical Service
Fighter Jet Metals supplies 440A, 440B, 440C, and 440FSE Stainless Steel in various forms—bars, plates, and forgings—with full traceability and certification. Each alloy meets the highest aerospace and industrial standards, offering guaranteed quality and performance.