The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-00-678-4770, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-678-4770 |
| Primary Part Number | 8763020 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Head Height | 0.310 INCHES NOMINAL IN |
| Fastener Length | 4.250 INCHES NOMINAL IN |
| Shoulder Length | 1.160 INCHES NOMINAL FIRST SHOULDER IN |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.060 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.960 INCHES MINIMUM AND 0.965 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 1.750 INCHES MINIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Rib Length | 1.040 INCHES MINIMUM AND 1.100 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.875 INCHES IN |
| Features Provided | CASEHARDENED |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 14 |
| Material | STEEL COMP 1340 OR STEEL COMP 4140 OR STEEL COMP 8640 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 8763020 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 5306006784770 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
NSN 5306-00-678-4770 is a Bolt,ribbed Shoulder, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-678-4770 has 1 manufacturer part number on file: 8763020 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8763020: Head Height: 0.310 INCHES NOMINAL IN; Fastener Length: 4.250 INCHES NOMINAL IN; Shoulder Length: 1.160 INCHES NOMINAL FIRST SHOULDER IN; Distance From Largest Diameter of Bearing Surface of Head to Ribs: 0.060 INCHES MINIMUM AND 0.120 INCHES MAXIMUM 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.