Material Document and Classification: ASTM A581 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter: 0.489 INCHES MAXIMUM IN
Material Thickness: 0.010 INCHES NOMINAL IN
Material: STEEL COMP 303 OVERALL
Hole Diameter: 0.255 INCHES MINIMUM AND 0.263 INCHES MAXIMUM IN
Identification
NSN: 5310-01-421-2021
NIIN: 014212021
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
General Description
The Washer,lock, cataloged under National Stock Number 5310-01-421-2021, 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6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5310-01-421-2021
Item Name
Washer,lock
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Style Designator
SPLIT HELICAL-RIGHT HAND
Material Document and Classification
ASTM A581 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Outside Diameter
0.489 INCHES MAXIMUM IN
Material Thickness
0.010 INCHES NOMINAL IN
Material
STEEL COMP 303 OVERALL
Hole Diameter
0.255 INCHES MINIMUM AND 0.263 INCHES MAXIMUM 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
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
A3210100-1
3/2Design control — primary reference
U.S. Government activity
No interchangeability data on file.
Other items in FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040
5310-00-000-0040 · Item name not on file
5310-00-000-0077
NUT,PLAIN,ROUND
5310-00-000-0079
WASHER,FLAT
5310-00-000-0079
WASHER,FLAT
5310-00-000-1146
5310-00-000-1146 · Item name not on file
5310-00-000-3815
5310-00-000-3815 · Item name not on file
5310-00-000-4532
5310-00-000-4532 · Item name not on file
5310-00-000-4540
5310-00-000-4540 · Item name not on file
Frequently Asked Questions
What is NSN 5310-01-421-2021?
NSN 5310-01-421-2021 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
What are the specifications of 5310-01-421-2021?
Key specifications for 5310-01-421-2021: Style Designator: SPLIT HELICAL-RIGHT HAND; Material Document and Classification: ASTM A581 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.489 INCHES MAXIMUM IN; Material Thickness: 0.010 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-421-2021 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.