The Screw,close Tolerance, cataloged under National Stock Number 5305-01-337-5448, 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. Government technical data includes 14 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-337-5448 |
| Primary Part Number | BACB30MS4R14 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 1.285 INCHES MINIMUM AND 1.315 INCHES MAXIMUM IN |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Grip Diameter | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Head Diameter | 0.465 INCHES MINIMUM AND 0.510 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 |
|---|---|
| BACB30MS4R14 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30MS4R14 | Hi-Shear Corporation (USA) |
| BACB30MS4R14 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| BACB30MS4R14 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BACB30MS4R14 | 5/2 Secondary reference U.S. Government activity |
| BACB30MS4R14 | 5/2 Secondary reference U.S. Government activity |
| BACB30MS4R14 | 5/9 Secondary reference U.S. Government activity |
| BACB30MS4R14 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-337-5448 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-337-5448 has 3 manufacturer part numbers on file: BACB30MS4R14 (Sps Technologies, Llc Dba PB Fasteners), BACB30MS4R14 (Hi-Shear Corporation), BACB30MS4R14 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for BACB30MS4R14: Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 1.285 INCHES MINIMUM AND 1.315 INCHES MAXIMUM IN; Thread Length: 0.425 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN. 14 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.