The Screw,shoulder, cataloged under National Stock Number 5305-01-285-5980, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Syn-Tech System, Inc.. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-285-5980 |
| Primary Part Number | 8644790-62 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Syn-Tech System, Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.503 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Head Height | 0.610 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Fastener Length | 2.830 INCHES MINIMUM AND 2.870 INCHES MAXIMUM IN |
| Shoulder Length | 1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.996 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.820 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Single Shear Strength | ERR-060 |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 10 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.287 INCHES MINIMUM AND 1.312 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 |
|---|---|
| 8644790-62 | Syn-Tech System, Inc. (USA) |
| 8644790-62 | Century Fasteners Corp. Dba Century Fasteners Corp (USA) |
| 8644790-62 | Air Armament Center/ En (USA) |
| Reference | Meaning |
|---|---|
| MS51975-62 | 3/2 Design control — primary reference U.S. Government activity |
| MS51975-62 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-285-5980 is a Screw,shoulder, manufactured by Syn-Tech System, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-285-5980 has 3 manufacturer part numbers on file: 8644790-62 (Syn-Tech System, Inc.), 8644790-62 (Century Fasteners Corp. Dba Century Fasteners Corp), 8644790-62 (Air Armament Center/ En).
Key specifications for 8644790-62: Width Across Flats: 0.503 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN; Head Height: 0.610 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN; Fastener Length: 2.830 INCHES MINIMUM AND 2.870 INCHES MAXIMUM IN; Shoulder Length: 1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM FIRST SHOULDER IN. 19 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.