The Screw,close Tolerance, cataloged under National Stock Number 5305-00-004-2985, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp. Government technical data includes 11 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-004-2985 |
| Primary Part Number | A51G20551-13 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp |
| Status | ACTIVE |
| Fastener Length | 1.113 INCHES NOMINAL IN |
| Thread Length | 0.426 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.687 INCHES NOMINAL IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| A51G20551-13 | Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp (USA) |
| Reference | Meaning |
|---|---|
| A51G20551-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51G20551-11 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| A51G20551-13 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51G20551-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51G20551-13 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51G20551-13 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
NSN 5305-00-004-2985 is a Screw,close Tolerance, manufactured by Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-004-2985 has 1 manufacturer part number on file: A51G20551-13 (Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp).
Key specifications for A51G20551-13: Fastener Length: 1.113 INCHES NOMINAL IN; Thread Length: 0.426 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.250 INCHES IN; Thread Direction: RIGHT-HAND. 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.