Steel, astm a331, 4140, 4150, 8645, or steel qq-s-637, 1117; investment casting; mil-s-22141, ic 4140, ic 8640, tensile test is not appicable, casting per mil-c-6021, class 2, grade b; brazing material is brazing alloy, qq-b-650, bcu-1; harden and temper to rockwell a73-76.5; for 1117, carburize lg. At 1575-1600 degrees f. To case depth of 0.005-0.008, oil quench, temper 30 min. To file hardness; manganese phosphate or zinc phosphate, mil-p-16232, class 1, type m or z; brazed joint will withstand an axial load of 1000 lbs. Without evidence of failure.
NSN 5895-01-389-3721
NSN 6150-00-375-8786
NSN 6685-00-149-1600
NSN 5998-01-252-8623
NSN 4140-00-632-6169
NSN 6105-00-403-7526
NSN 5998-00-206-6613
NSN 5905-00-067-6755
NSN 6610-01-310-3313
NSN 6610-01-033-2402
NSN 7035-01-163-3667
NSN 5920-01-515-9738