CBS-50 NiL® AMS 6278

CBS-50 NiL is a carburizing bearing and gear steel designed for service temperatures up to 600°F. It has high core fracture toughness properties compared to other bearing alloys. Because the CBS-50 NiL can be carburized, surface stresses are controlled to provide excellent rolling contact fatigue characteristics.

Stock sizes: 3.500” to 8.000” diameter

Common Specifications:

  • AMS 6278
  • B50TF347
  • General Electric S-400 / S-SPEC-35
  • Pratt & Whitney LCS F-17

Industry Trade Names:

  • M50NIL
  • UNS K91231

Common Applications:

  • Aerospace bearings
  • Aerospace gears

Macrostructure Limits:

Composition

Element Min. Max.
Carbon 0.11 0.15
Manganese 0.15 0.35
Silicon 0.10 0.25
Phosphorus — 0.015
Sulfur — 0.010
Chromium 4.00 4.25
Nickel 3.20 3.60
Molybdenum 4.00 4.50
Copper — 0.10
Vanadium 1.13 1.33
Cobalt — 0.25
Tungsten — 0.15