National Item Identification Number
01-005-0496
National Stock Number
Item Name
WASHER,CONCAVE
Federal Supply Class
5310
Description
A washer which is round with a centrally located hole. One bearing surface is smooth, flat, and unbroken, the other bearing surface is smooth, unbroken, and is recessed to form a curved or spherical contour. See also WASHER (1), CONVEX. Excludes WASHER (1), RECESSED and BEARING, WASHER, THRUST.
Commercial and Government Entity Code (Supplier Data)
56878
76301
Reference Numbers (Part Numbers)
3M139-4
3M139-4
Required Categories
MATERIAL
SURFACE TREATMENT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION
STYL
Required Description
STEEL OVERALL
CADMIUM AND
CHROMATE OVERALL
QQ-P-416,TY 2,CL 3 FED SPEC SINGLE