The Screw,shoulder, cataloged under National Stock Number 5305-00-151-8657, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-00-151-8657 |
| Primary Part Number | GS551P4-681 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Fastener Length | 1.017 INCHES MINIMUM AND 1.047 INCHES MAXIMUM IN |
| Shoulder Length | 0.556 INCHES MINIMUM AND 0.586 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.254 INCHES MINIMUM AND 0.256 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.397 INCHES MINIMUM AND 0.427 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | SLOT |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 4037 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.357 INCHES NOMINAL 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 |
|---|---|
| GS551P4-681 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| GS551P4-681 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| GS551P4-681 | 5/9 Secondary reference Bfgoodrich Co the Aerospace Div Engineered Polymer Products |
| 2R1465-9 | 5/9 Secondary reference Bfgoodrich Co the Aerospace Div Engineered Polymer Products |
NSN 5305-00-151-8657 is a Screw,shoulder, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-151-8657 has 2 manufacturer part numbers on file: GS551P4-681 (Northrop Grumman Systems Corporation), GS551P4-681 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
Key specifications for GS551P4-681: Fastener Length: 1.017 INCHES MINIMUM AND 1.047 INCHES MAXIMUM IN; Shoulder Length: 0.556 INCHES MINIMUM AND 0.586 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.254 INCHES MINIMUM AND 0.256 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.