The Bolt,square Neck, cataloged under National Stock Number 5306-01-421-7578, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is L a Benson Company Incorporated, the. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-421-7578 |
| Primary Part Number | 1339AS1037-2 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | L a Benson Company Incorporated, the |
| Status | ACTIVE |
| Neck Length | 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN |
| Fastener Length | 2.250 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.380 INCHES IN |
| Head Style | FLAT TOP ELEVATOR |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.310 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 |
|---|---|
| 1339AS1037-2 | Spencer Products Co Inc (USA) |
| 1339AS1037-2 PRIMARY | L a Benson Company Incorporated, the (USA) |
| Reference | Meaning |
|---|---|
| 1339AS1037-2 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 5306-01-421-7578 is a Bolt,square Neck, manufactured by L a Benson Company Incorporated, the, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-421-7578 has 2 manufacturer part numbers on file: 1339AS1037-2 (Spencer Products Co Inc), 1339AS1037-2 (L a Benson Company Incorporated, the).
Key specifications for 1339AS1037-2: Neck Length: 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN; Fastener Length: 2.250 INCHES NOMINAL IN; Nominal Thread Diameter: 0.380 INCHES IN; Head Style: FLAT TOP ELEVATOR. 11 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.