The Screw,machine, cataloged under National Stock Number 5305-01-331-0029, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Support Services Corp. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-331-0029 |
| Primary Part Number | 1A20955H01 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Support Services Corp |
| Status | ACTIVE |
| Head Height | 0.105 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN |
| Screw Surface Treatment | PASSIVATE |
| Fastener Length | 0.872 INCHES NOMINAL IN |
| Thread Length | 0.380 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | PAN NO. 2 |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 309 OR STEEL COMP 310 |
| Minimum Tensile Strength | 80000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE II |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.306 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| 1A20955H01 PRIMARY | Northrop Grumman Support Services Corp (USA) |
| 1A20955H01 | Accurate Screw Machine Corp Div Accurate Screw Machine Corporation (USA) |
| 1A20955H01 | Allmetal Screw Products Corp (USA) |
| Reference | Meaning |
|---|---|
| 1A20955H01 | 3/9 Design control — primary reference U.S. Government activity |
| 1A20955A01 | 5/9 Secondary reference All Stainless, Inc. |
NSN 5305-01-331-0029 is a Screw,machine, manufactured by Northrop Grumman Support Services Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-331-0029 has 3 manufacturer part numbers on file: 1A20955H01 (Northrop Grumman Support Services Corp), 1A20955H01 (Accurate Screw Machine Corp Div Accurate Screw Machine Corporation), 1A20955H01 (Allmetal Screw Products Corp).
Key specifications for 1A20955H01: Head Height: 0.105 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN; Screw Surface Treatment: PASSIVATE; Fastener Length: 0.872 INCHES NOMINAL IN; Thread Length: 0.380 INCHES NOMINAL IN. 15 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.