The Screw,machine, cataloged under National Stock Number 5305-01-656-2519, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-656-2519 |
| Primary Part Number | BACB30EM-P4L5 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.112 INCHES MAXIMUM IN |
| Bearing Surface of Head Surface Finish | 32.0 MICROINCHES |
| Screw Surface Treatment | CADMIUM AND NICKEL |
| Fastener Length | 0.7375 INCHES NOMINAL IN |
| Screw Material Document and Classification | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049OR AMS6322 OR AMS6304 MIL SPEC 2ND MATERIAL RESPONSE |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Shank Surface Finish | 125.0 MICROINCHES |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | PAN NO. 2 |
| Thread Direction | RIGHT-HAND |
| Thread Surface Finish | 32.0 MICROINCHES |
| Specification/standard Data | 81205-BACB30EM MANUFACTURERS STANDARD |
| Screw Material | STEEL COMP 4340 OR STEEL COMP 8740 |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.445 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Screw Surface Treatment Document and Classification | AMS2416 NATIONAL SPEC SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| BACB30EM-P4L5 | Howmet Global Fastening Systems Inc (USA) |
| BACB30EM-P4L5 | Hi-Shear Corporation (USA) |
| BACB30EM-P4L5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30EM-P4L5 | Huck International, Inc (USA) |
| BACB30EM-P4L5 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| Reference | Meaning |
|---|---|
| BACB30EM-P4L5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-656-2519 is a Screw,machine, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-656-2519 has 5 manufacturer part numbers on file: BACB30EM-P4L5 (Howmet Global Fastening Systems Inc), BACB30EM-P4L5 (Hi-Shear Corporation), BACB30EM-P4L5 (Sps Technologies, Llc Dba PB Fasteners), BACB30EM-P4L5 (Huck International, Inc), BACB30EM-P4L5 (Howmet Global Fastening Systems Inc Div City of Industry Operations).
Key specifications for BACB30EM-P4L5: Head Height: 0.112 INCHES MAXIMUM IN; Bearing Surface of Head Surface Finish: 32.0 MICROINCHES; Screw Surface Treatment: CADMIUM AND NICKEL; Fastener Length: 0.7375 INCHES NOMINAL 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.