The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-068-1303, 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 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-068-1303 |
| Primary Part Number | 12274571 |
| 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 | 3.541 INCHES MINIMUM AND 3.601 INCHES MAXIMUM IN |
| Shoulder Length | 1.160 INCHES NOMINAL FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.060 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 1.200 INCHES MINIMUM AND 1.300 INCHES MAXIMUM IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | ASTM A322 ASSN STD ALL MATERIAL RESPONSES OR ASTM A331 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Rib Length | 1.040 INCHES MINIMUM AND 1.100 INCHES MAXIMUM IN |
| Rib Minor Diameter | 0.880 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.875 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 14 |
| Material | STEEL COMP 8637 OR STEEL COMP 8640 OVERALL |
| Thread Series Designator | UNF |
| Rib Quantity | 28 |
| 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 |
|---|---|
| 12274571 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 5306010681303 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
NSN 5306-01-068-1303 is a Bolt,ribbed Shoulder, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-068-1303 has 1 manufacturer part number on file: 12274571 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12274571: Head Height: 0.310 INCHES NOMINAL IN; Fastener Length: 3.541 INCHES MINIMUM AND 3.601 INCHES MAXIMUM IN; Shoulder Length: 1.160 INCHES NOMINAL FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416,TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 23 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.