BMS 7-351
BMS 7-351 is the Boeing Material Specification for 15-5 PH (UNS S15500) precipitation hardening stainless steel. It defines Boeing’s specific chemical composition, mechanical property, heat treatment condition, and approved supplier requirements for 15-5 PH bar, forgings, and machined components used in Boeing aircraft structural and precision applications.
15-5 PH offers tensile strengths from 145 ksi (H1150) to 190 ksi (H900), excellent transverse properties versus 17-4 PH, and good corrosion resistance. BMS7-351 ensures 15-5 PH material procured for Boeing programs meets Boeing’s exacting quality standards.
BMS 7-351 references 15-5 PH in aged conditions H900 through H1150, with UTS ranging from approximately 190 ksi (H900) to 145 ksi (H1150). Boeing requires sourcing from BMS-approved material processors with full certification traceability. Hardness verification and mechanical testing per Boeing requirements.
- Boeing Aircraft Structural Fittings
- Actuator Components and Valve Bodies
- Precision Machined Structural Parts
- Engine Pylon and Nacelle Hardware
- Flight-Critical Fastener Applications
15-5 PH Stainless Steel
15-5 PH precipitation hardening stainless steel overview — properties, product forms, and specifications.
Boeing BMS Specifications
Boeing Material Specifications for stainless steel and precision alloys used in Boeing programs.
Certified Material for Critical Service
BMS 7-351 material is supplied with full Boeing-required certifications including chemical analysis, mechanical test reports confirming the specified aged condition, and complete heat-lot traceability from Boeing-approved processors.