Nut Height: 0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
Surface Treatment: BLACK OXIDE OVERALL
Nut Style: HEXAGON
Thread Class: A2B
Material: STEEL COMP 303 OVERALL
Identification
NSN: 5310-01-644-2603
NIIN: 016442603
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
General Description
The Nut,self-Locking,hexagon, cataloged under National Stock Number 5310-01-644-2603, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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
5310-01-644-2603
Item Name
Nut,self-Locking,hexagon
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Thread Series
UNIFIED NATIONAL COARSE (UNC)
Nominal Thread Size
0.138 INCHES IN
Nut Height
0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
Surface Treatment
BLACK OXIDE OVERALL
Nut Style
HEXAGON
Thread Class
A2B
Material
STEEL COMP 303 OVERALL
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
M45913/1-06CS3B
2/2Government specification standardization
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 5310-01-644-2603?
NSN 5310-01-644-2603 is a Nut,self-Locking,hexagon, classified under FSC 5310, Nuts and Washers. Status: active.
What are the specifications of 5310-01-644-2603?
Key specifications for 5310-01-644-2603: Thread Series: UNIFIED NATIONAL COARSE (UNC); Nominal Thread Size: 0.138 INCHES IN; Nut Height: 0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Surface Treatment: BLACK OXIDE OVERALL. 7 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-644-2603 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.