The Screw,machine, cataloged under National Stock Number 5305-00-655-9320, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Bsi Standards Limited. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-00-655-9320 |
| Primary Part Number | A25-1C |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Head Height | 0.106 INCHES MINIMUM AND 0.113 INCHES MAXIMUM IN |
| Screw Surface Treatment | CADMIUM |
| Fastener Length | 0.550 INCHES MINIMUM AND 0.594 INCHES MAXIMUM IN |
| Thread Length | 0.450 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.185 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.319 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN |
| Screw Material | STEEL |
| Thread Quantity Per Inch | 31.3 |
| Thread Series Designator | WHITWORTH |
| 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 |
|---|---|
| SR172-2 | Meggitt Aerospace Limited (GBR) |
| A25-1C PRIMARY | Bsi Standards Limited (GBR) |
| Reference | Meaning |
|---|---|
| A25-1C | C/1 Advisory reference — outside the item-of-supply concept Martin-Baker Aircraft Company Limited |
| 99-9436920 | 6/9 Informative reference only U.S. Government activity |
NSN 5305-00-655-9320 is a Screw,machine, manufactured by Bsi Standards Limited, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-655-9320 has 2 manufacturer part numbers on file: SR172-2 (Meggitt Aerospace Limited), A25-1C (Bsi Standards Limited).
1 possible match (shared part number, not a government interchangeability claim): 5306-01-125-4119. Verify interchangeability with system specifications before substitution.
Key specifications for A25-1C: Head Height: 0.106 INCHES MINIMUM AND 0.113 INCHES MAXIMUM IN; Screw Surface Treatment: CADMIUM; Fastener Length: 0.550 INCHES MINIMUM AND 0.594 INCHES MAXIMUM IN; Thread Length: 0.450 INCHES MINIMUM IN. 11 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.