The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-540-0691, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Assembly Fasteners Inc Dba Assembly Fasteners Inc. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-540-0691 |
| Primary Part Number | 31C400HHCSG8STZD |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Assembly Fasteners Inc Dba Assembly Fasteners Inc |
| Status | ACTIVE |
| Fastener Length | 4.000 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Thread Quantity Per Inch | 18 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 31C400HHCSG8STZD | Assembly Fasteners Inc Dba Assembly Fasteners Inc (USA) |
| Reference | Meaning |
|---|---|
| HGH400 | 3/9 Design control — primary reference Gse Holdings Inc. Dba Itw Military Gse Div Hobart Ground Systems |
| HGH400 | C/1 Advisory reference — outside the item-of-supply concept Itw Gse Inc. |
NSN 5305-01-540-0691 is a Screw,cap,hexagon Head, manufactured by Assembly Fasteners Inc Dba Assembly Fasteners Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-540-0691 has 1 manufacturer part number on file: 31C400HHCSG8STZD (Assembly Fasteners Inc Dba Assembly Fasteners Inc).
Key specifications for 31C400HHCSG8STZD: Fastener Length: 4.000 INCHES NOMINAL IN; Nominal Thread Diameter: 0.312 INCHES IN; Head Style: HEXAGON; Thread Direction: RIGHT-HAND. 6 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.