scope:

THIS SPECIFICATION IS APPROVED FOR USE BY ALL DEPARTMENTS AND AGENCIES OF THE DEPARTMENT OF DEFENSE.

THE REQUIREMENTS FOR ACQUIRING THE PRODUCT(S) DESCRIBED HEREIN SHALL CONSIST OF THIS SPECIFICATION SHEET AND THE ISSUE OF THE FOLLOWING SPECIFICATION LISTED IN THAT ISSUE OF THE DODISS SPECIFIED IN THE SOLICITATION: MIL-B-3990

MATERIALS:

RINGS AND ROLLERS STEEL, MIL-S-8690, MIL-S-7420, ASTM A304 A322/A331, QQ-S-700, FED. STD 66, AISI/SAE 50100, 51100, AISI 8620, 8620H, AMS 6440, AMS 6442.

SEALS: ACETAL RESIN PER L-P-392 OR NYLON 6/6 PER L-P-410 POLYESTER ELASTOMER, OR EQUIVALENT, CONSTRUCTION OPTIONAL.

[A circled]FINISH- ROLLER O.D. AND SIDES CHROME PLATED IN ACCORDANCE WITH QQ-C-320, CLASS 2, EXCEPT THICKNESS TO BE .0004-.0007 INCHES. EXPOSED SURFACE OF OTHER PARTS AS MOUNTED SHALL BE ZINC-NICKLE PLATED IN ACCORDANCE WITH AMS 2417, TYPE 2, OR CADMIUM PLATED IN ACCORDANCE WITH QQ-P-416, TYPE II, CLASS 2, TO A THICKNESS OF .0003 TO 0006 INCHES EXTERNALLY THREADED AREAS SHALL BE .0002 TO .0005 INCHES THICK

EXAMPLE OF PART NUMBER-