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Last Modified: Jun 01, 2020

Part Number 40438A Flat Washer

National Stock Number: 5310-00-001-8109

40438A Cross Reference Parts

MFG Part Number ISC RNVC RNCC HCC MSDS SADC DAC

40438A

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Summary Information (click on this NSN number for detailed information: 5310-00-001-8109)

Definition: Flat Washer, also referenced with federal logistics item name code 13393: A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. the hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). the thickness cannot exceed 25 percent of the largest outside dimension. when the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. the maximum tolerance is applied to dimensions and used as a determining factor. items with separable lamination use shim. for items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. excludes disk, valve, graphite impregnated and lubricated items.
Federal Supply Class (FSC): 5310
NIIN: 00-001-8109 (000018109)
NMF Description: WASHERS/GASKETS/PCKG DVCS NOI
Similar parts: 5310-00-059-9266 5310-00-059-0812 5310-00-059-6684 5310-00-059-5798 5310-00-059-8227 5310-00-059-0843 5310-00-059-3678 5310-00-059-0814 5310-00-059-2831 5310-00-060-2040 5310-00-059-9278