The Bolt,square Neck, cataloged under National Stock Number 5306-01-157-3373, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-157-3373 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Neck Length | 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN |
| Head Height | 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Fastener Length | 2.920 INCHES MINIMUM AND 3.060 INCHES MAXIMUM IN |
| Special Test Features | SPECIAL QUALITY CONTROL TESTING |
| Thread Length | 1.250 INCHES MINIMUM IN |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | BUTTON |
| Thread Direction | RIGHT-HAND |
| Neck Width | 0.492 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2A A |
| Test Data Document | 81349-MIL-P-23199 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Thread Quantity Per Inch | 13 |
| Material | STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 384 OR STEEL COMP 410 OR STEEL COMP 416 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY MATERIAL WHICH MUST CONFORM TO SHIPS PARTS CONTROL CENTER SPECIAL QUALITY CONTROL PROVISIONS |
| Head Diameter | 1.032 INCHES MINIMUM AND 1.094 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 | S |
| Reference | Meaning |
|---|---|
| 51070-1-001 FIND NO 24 | 3/1 Design control — primary reference U.S. Government activity |
| 51070-1-001-24 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-157-3373 is a Bolt,square Neck, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-157-3373: Neck Length: 0.250 INCHES MINIMUM AND 0.281 INCHES MAXIMUM IN; Head Height: 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN; Fastener Length: 2.920 INCHES MINIMUM AND 3.060 INCHES MAXIMUM IN; Special Test Features: SPECIAL QUALITY CONTROL TESTING. 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.