The Screw,close Tolerance, cataloged under National Stock Number 5305-00-151-8656, 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 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-151-8656 |
| Primary Part Number | BM19070-4-621 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Fastener Length | 0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.379 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM OVERALL |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.545 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN |
| Grip Diameter | 0.2540 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| BM19070-4-621 PRIMARY | Huck International, Inc (USA) |
| GS551P4-621 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF1286-621 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| GS551P4-621 | 5/9 Secondary reference Aero Mechanical Fastening Systems Inc |
| GS551P4-621 | 5/9 Secondary reference Bfgoodrich Co the Aerospace Div Engineered Polymer Products |
| GS551P4-621 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
| 2R1465-8 | 5/9 Secondary reference Bfgoodrich Co the Aerospace Div Engineered Polymer Products |
| BM19070-4-621 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-00-151-8656 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-151-8656 has 3 manufacturer part numbers on file: BM19070-4-621 (Huck International, Inc), GS551P4-621 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), PBF1286-621 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
Key specifications for BM19070-4-621: Fastener Length: 0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.379 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN; Hardness Rating: 33.0 ROCKWELL C MINIMUM OVERALL. 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.