The Screw,shoulder, cataloged under National Stock Number 5305-00-151-8660, 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 Div PB Fasteners. 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through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-151-8660 |
| Primary Part Number | PBF1286-921 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Fastener Length | 1.266 INCHES MINIMUM AND 1.296 INCHES MAXIMUM IN |
| Shoulder Length | 0.796 INCHES MINIMUM AND 0.826 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 | 0.406 INCHES MINIMUM AND 0.436 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 NOMINAL |
| 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 |
|---|---|
| PBF1286-921 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HP6551P4-921 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| Reference | Meaning |
|---|---|
| BM19070-921 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| GS551P4-921 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
| BM19070-4-921 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 2R1465-13 | 5/9 Secondary reference Bfgoodrich Co the Aerospace Div Engineered Polymer Products |
| GS551P-4921 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| MA6551P4-921 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| BM19070-921 | 5/9 Secondary reference U.S. Government activity |
| BM19070-4-921 | 5/9 Secondary reference U.S. Government activity |
| 2R1863-921 | 5/9 Secondary reference Aero Mechanical Fastening Systems Inc |
| GS551P-4921 | 5/9 Secondary reference Aero Mechanical Fastening Systems Inc |
NSN 5305-00-151-8660 is a Screw,shoulder, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-151-8660 has 2 manufacturer part numbers on file: PBF1286-921 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HP6551P4-921 (Heartland Precision Fasteners Inc).
Key specifications for PBF1286-921: Fastener Length: 1.266 INCHES MINIMUM AND 1.296 INCHES MAXIMUM IN; Shoulder Length: 0.796 INCHES MINIMUM AND 0.826 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.