The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-181-1561, 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20 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-181-1561 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.310 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN |
| Fastener Length | 2.880 INCHES MINIMUM AND 2.910 INCHES MAXIMUM IN |
| Shoulder Length | 1.470 INCHES MINIMUM AND 1.500 INCHES MAXIMUM FIRST SHOULDER IN |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.060 INCHES NOMINAL IN |
| Shoulder Diameter | 0.783 INCHES MINIMUM AND 0.786 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.320 INCHES MAXIMUM IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Material Document and Classification | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Rib Length | 0.500 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Features Provided | CASEHARDENED |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.810 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 4427 OR STEEL COMP 8640 OVERALL |
| Thread Series Designator | UNF |
| Rib Quantity | 36 |
| Head Diameter | 1.190 INCHES MINIMUM AND 1.310 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 |
|---|---|
| 491206C1 | 5/2 Secondary reference U.S. Government activity |
| 596008C1 | 3/2 Design control — primary reference U.S. Government activity |
| RH-49851 | 5/9 Secondary reference Alliedsignal Inc Alliedsignal Braking Systems-Wheel End Products |
NSN 5306-01-181-1561 is a Bolt,ribbed Shoulder, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-181-1561: Head Height: 0.310 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN; Fastener Length: 2.880 INCHES MINIMUM AND 2.910 INCHES MAXIMUM IN; Shoulder Length: 1.470 INCHES MINIMUM AND 1.500 INCHES MAXIMUM FIRST SHOULDER IN; Distance From Largest Diameter of Bearing Surface of Head to Ribs: 0.060 INCHES NOMINAL IN. 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.