The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-681-0551, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hiab Usa Inc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-681-0551 |
| Primary Part Number | 9988271 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hiab Usa Inc |
| Status | ACTIVE |
| Width Across Flats | 4.020 MILLIMETERS MINIMUM AND 4.095 MILLIMETERS MAXIMUM MM |
| Head Height | 4.82 MILLIMETERS MINIMUM AND 5.00 MILLIMETERS MAXIMUM MM |
| Fastener Length | 12.0 MILLIMETERS NOMINAL MM |
| Thread Pitch in Millimeters | 0.80 |
| Nominal Thread Diameter | 5.0 MILLIMETERS MM |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 6G G |
| Thread Series Designator | M |
| Head Diameter | 8.28 MILLIMETERS MINIMUM AND 8.50 MILLIMETERS MAXIMUM 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 |
|---|---|
| 9988271 PRIMARY | Hiab Usa Inc (USA) |
| Reference | Meaning |
|---|---|
| 4466684001 | 7/2 Vendor item drawing reference Oshkosh Defense Llc |
NSN 5305-01-681-0551 is a Screw,cap,socket Head, manufactured by Hiab Usa Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-681-0551 has 1 manufacturer part number on file: 9988271 (Hiab Usa Inc).
Key specifications for 9988271: Width Across Flats: 4.020 MILLIMETERS MINIMUM AND 4.095 MILLIMETERS MAXIMUM MM; Head Height: 4.82 MILLIMETERS MINIMUM AND 5.00 MILLIMETERS MAXIMUM MM; Fastener Length: 12.0 MILLIMETERS NOMINAL MM; Thread Pitch in Millimeters: 0.80. 10 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.