The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-600-3109, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company Dba Fastenal Co. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-600-3109 |
| Primary Part Number | 39981 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Fastenal Company Dba Fastenal Co |
| Status | ACTIVE |
| Width Across Flats | 6.1 MILLIMETERS NOMINAL MM |
| External Thread Tolerance Class | 6G G |
| Fastener Length | 40.0 MILLIMETERS NOMINAL MM |
| Thread Pitch in Millimeters | 1.5 |
| Thread Length | 26.0 MILLIMETERS NOMINAL MM |
| Nominal Thread Diameter | 10.0 MILLIMETERS MM |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Color | BLACK OVERALL |
| Surface Treatment | OXIDE OVERALL |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 90.0 DEGREES NOMINAL |
| Material | STEEL OVERALL |
| Thread Series Designator | M |
| Head Diameter | 19.7 MILLIMETERS NOMINAL MM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 3011521 | General Dynamics Land Systems - Force Protection Inc. Dba Gdls Div Gdls-Fp (USA) |
| 39981 PRIMARY | Fastenal Company Dba Fastenal Co (USA) |
| Reference | Meaning |
|---|---|
| 12759-01312 | C/1 Advisory reference — outside the item-of-supply concept Fastenal Company Dba Fastenal Co |
NSN 5305-01-600-3109 is a Screw,cap,socket Head, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-600-3109 has 2 manufacturer part numbers on file: 3011521 (General Dynamics Land Systems - Force Protection Inc. Dba Gdls Div Gdls-Fp), 39981 (Fastenal Company Dba Fastenal Co).
1 possible match (shared part number, not a government interchangeability claim): 2935-01-715-0141. Verify interchangeability with system specifications before substitution.
Key specifications for 39981: Width Across Flats: 6.1 MILLIMETERS NOMINAL MM; External Thread Tolerance Class: 6G G; Fastener Length: 40.0 MILLIMETERS NOMINAL MM; Thread Pitch in Millimeters: 1.5. 15 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.