The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-129-4437, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 24 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-129-4437 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.185 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN |
| Rib Included Angle | 90.0 DEGREES NOMINAL |
| Fastener Length | 1.437 INCHES NOMINAL IN |
| Shoulder Length | 0.843 INCHES NOMINAL FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.063 INCHES NOMINAL IN |
| Shoulder Diameter | 0.360 INCHES MINIMUM AND 0.388 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.825 INCHES NOMINAL IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Material Document and Classification | ASTM-A490 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Rib Length | 0.594 INCHES NOMINAL IN |
| Rib Minor Diameter | 0.062 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.405 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 110000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Rib Quantity | 12 |
| Head Diameter | 0.615 INCHES MINIMUM AND 0.625 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 |
| Reference | Meaning |
|---|---|
| 8140842-03 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5306-01-129-4437 is a Bolt,ribbed Shoulder, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-129-4437: Head Height: 0.185 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN; Rib Included Angle: 90.0 DEGREES NOMINAL; Fastener Length: 1.437 INCHES NOMINAL IN; Shoulder Length: 0.843 INCHES NOMINAL FIRST SHOULDER IN. 24 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.