The Screw,shoulder, cataloged under National Stock Number 5305-01-477-4130, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-477-4130 |
| Primary Part Number | BM21010-3-4 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.145 INCHES MAXIMUM IN |
| Fastener Length | 0.553 INCHES MINIMUM AND 0.583 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TYPE 11,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE OVERALL |
| Thread Length | 0.190 INCHES NOMINAL IN |
| Shoulder Shape | ROUND OVERALL |
| Material Document and Classification | MIL-S-7839 MIL SPEC ALL MATERIAL RESPONSES OR MIL-S-6049 MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| Head Style | ROOF |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | CROSS RECESS TYPE III |
| Thread Class | 3A A |
| Material | STEEL OVERALL |
| Head Diameter | 0.357 INCHES MINIMUM AND 0.373 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 |
|---|---|
| BM21010-3-4 PRIMARY | Huck International, Inc (USA) |
| PBF1287-2 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| GS550BJ2 | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| BM21010-3-4 | 5/9 Secondary reference U.S. Government activity |
| 2R1864-2 | 3/9 Design control — primary reference Bfgoodrich Co the Aerospace Div Engineered Polymer Products |
NSN 5305-01-477-4130 is a Screw,shoulder, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-477-4130 has 3 manufacturer part numbers on file: BM21010-3-4 (Huck International, Inc), PBF1287-2 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), GS550BJ2 (Northrop Grumman Systems Corporation).
Key specifications for BM21010-3-4: Head Height: 0.145 INCHES MAXIMUM IN; Fastener Length: 0.553 INCHES MINIMUM AND 0.583 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416 TYPE 11,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE OVERALL; Thread Length: 0.190 INCHES NOMINAL IN. 13 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.