The Screw,machine, cataloged under National Stock Number 5305-00-993-4255, 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 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-993-4255 |
| Primary Part Number | A113-2B |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Head Height | 0.074 INCHES MINIMUM AND 0.086 INCHES MAXIMUM IN |
| Screw Surface Treatment | CADMIUM |
| Fastener Length | 0.600 INCHES NOMINAL IN |
| Thread Length | 0.400 INCHES MINIMUM IN |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | BUTTON |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.303 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN |
| 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 |
|---|---|
| A113-2B PRIMARY | Bsi Standards Limited (GBR) |
| A113-2B | Lentern Intl Inc (USA) |
| Reference | Meaning |
|---|---|
| 99-9419597 | 6/9 Informative reference only U.S. Government activity |
| A113-2B | C/1 Advisory reference — outside the item-of-supply concept Martin-Baker Aircraft Company Limited |
NSN 5305-00-993-4255 is a Screw,machine, manufactured by Bsi Standards Limited, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-993-4255 has 2 manufacturer part numbers on file: A113-2B (Bsi Standards Limited), A113-2B (Lentern Intl Inc).
Key specifications for A113-2B: Head Height: 0.074 INCHES MINIMUM AND 0.086 INCHES MAXIMUM IN; Screw Surface Treatment: CADMIUM; Fastener Length: 0.600 INCHES NOMINAL IN; Thread Length: 0.400 INCHES MINIMUM IN. 13 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.