The Screw,shoulder, cataloged under National Stock Number 5305-01-170-1348, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 18 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-170-1348 |
| Primary Part Number | BACB30LL4-15X |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Fastener Length | 1.464 INCHES MINIMUM AND 1.494 INCHES MAXIMUM IN |
| Shoulder Length | 0.825 INCHES MINIMUM AND 0.845 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.516 INCHES MINIMUM AND 0.566 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| 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 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.688 INCHES MINIMUM AND 0.756 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 |
|---|---|
| BACB30LL4-15X | Howmet Global Fastening Systems Inc (USA) |
| BACB30LL4-15X | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LL4-15X PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30LL4-15X PRIMARY | Hi-Shear Corporation (USA) |
| BACB30LL4-15X | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30LL4-15X | 7/2 Vendor item drawing reference U.S. Government activity |
| BACB30LL4-15X | 5/9 Secondary reference U.S. Government activity |
| BACB30LL4-15X | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-170-1348 is a Screw,shoulder, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-170-1348 has 5 manufacturer part numbers on file: BACB30LL4-15X (Howmet Global Fastening Systems Inc), BACB30LL4-15X (Sps Technologies, Llc Dba PB Fasteners), BACB30LL4-15X (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BACB30LL4-15X (Hi-Shear Corporation), BACB30LL4-15X (Huck International, Inc).
Key specifications for BACB30LL4-15X: Fastener Length: 1.464 INCHES MINIMUM AND 1.494 INCHES MAXIMUM IN; Shoulder Length: 0.825 INCHES MINIMUM AND 0.845 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN. 18 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.