The Screw,lag, cataloged under National Stock Number 5305-01-581-9300, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. 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. 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 | 5305-01-581-9300 |
| Primary Part Number | 91478A554 |
| Item Name | Screw,lag |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Nonmachine Nominal Thread Diameter | 0.250 INCHES IN |
| Fastener Length | 3.000 INCHES NOMINAL IN |
| Hardness Rating | 70.0 ROCKWELL B MINIMUM OVERALL |
| Nonmachine Thread Style | WOOD SCREW (TYPE WD) |
| Surface Treatment | ZINC OVERALL |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 91478A554 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5305-01-581-9300 is a Screw,lag, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-581-9300 has 1 manufacturer part number on file: 91478A554 (Mcmaster-Carr Supply Co).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-582-0901. Verify interchangeability with system specifications before substitution.
Key specifications for 91478A554: Nonmachine Nominal Thread Diameter: 0.250 INCHES IN; Fastener Length: 3.000 INCHES NOMINAL IN; Hardness Rating: 70.0 ROCKWELL B MINIMUM OVERALL; Nonmachine Thread Style: WOOD SCREW (TYPE WD). 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.