The Washer,flat, cataloged under National Stock Number 5310-01-263-8263, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5310-01-263-8263
Item Name
Washer,flat
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Width Across Flats
1.625 INCHES NOMINAL IN
Cross-Sectional Shape Style
RECTANGULAR
Peripheral Shape Style
SQUARE
Center Hole Shape Style
ROUND
Hole Diameter
0.375 INCHES NOMINAL IN
Thickness
0.250 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4510-01-384-3614B-200POSSIBLE MATCH
DRIER,HAND,ELECTRIC
Possible match (shared part number)Bobrick Washroom Equipment Inc
5965-01-561-2076B200POSSIBLE MATCH
HEADSET-MICROPHONE
Possible match (shared part number)Vxi Corporation
6520-01-591-5672B200POSSIBLE MATCH
BAND,MATRIX,DENTAL
Possible match (shared part number)Garrison Dental Solutions
5820-01-692-2688B200POSSIBLE MATCH
RECEIVING SET,RADIO
Possible match (shared part number)Ettus Research Llc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
B200
3/2Design control — primary reference
U.S. Government activity
Related Parts
4510-01-384-3614POSSIBLE MATCH
DRIER,HAND,ELECTRIC
B-200
5965-01-561-2076POSSIBLE MATCH
HEADSET-MICROPHONE
B200
6520-01-591-5672POSSIBLE MATCH
BAND,MATRIX,DENTAL
B200
5820-01-692-2688POSSIBLE MATCH
RECEIVING SET,RADIO
B200
Frequently Asked Questions
What is NSN 5310-01-263-8263?
NSN 5310-01-263-8263 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
What NSN replaces 5310-01-263-8263?
4 possible matches (shared part number, not a government interchangeability claim): 4510-01-384-3614, 5965-01-561-2076, 6520-01-591-5672. Verify interchangeability with system specifications before substitution.
What are the specifications of 5310-01-263-8263?
Key specifications for 5310-01-263-8263: Width Across Flats: 1.625 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: SQUARE; Center Hole Shape Style: ROUND. 6 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-263-8263 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.