The Screw,shoulder, cataloged under National Stock Number 5305-01-451-3491, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-451-3491 |
| Primary Part Number | C7985-3D9R |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Fastener Length | 0.910 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN |
| Shoulder Length | 0.553 INCHES MINIMUM AND 0.573 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2037 INCHES MINIMUM AND 0.2043 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.363 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP H11 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.258 INCHES MINIMUM AND 0.305 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 |
|---|---|
| C7985-3D9R | Sps Technologies, Llc Dba PB Fasteners (USA) |
| C7985-3D9R | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| C7985-3D9R | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| C7985-3D9R | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| C7985-3D9R | 5/2 Secondary reference U.S. Government activity |
| C7985-3D9R | 3/2 Design control — primary reference U.S. Government activity |
| C7985-3D9R | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-451-3491 is a Screw,shoulder, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-451-3491 has 4 manufacturer part numbers on file: C7985-3D9R (Sps Technologies, Llc Dba PB Fasteners), C7985-3D9R (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), C7985-3D9R (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), C7985-3D9R (Howmet Global Fastening Systems Inc).
Key specifications for C7985-3D9R: Fastener Length: 0.910 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN; Shoulder Length: 0.553 INCHES MINIMUM AND 0.573 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.2037 INCHES MINIMUM AND 0.2043 INCHES MAXIMUM FIRST SHOULDER IN. 20 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.