The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-039-6637, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-039-6637 |
| Primary Part Number | 12008318 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate |
| Status | ACTIVE |
| Head Height | 0.380 INCHES NOMINAL IN |
| Rib Included Angle | 45.0 DEGREES NOMINAL |
| Fastener Length | 2.820 INCHES NOMINAL IN |
| Shoulder Length | 0.760 INCHES NOMINAL FIRST SHOULDER IN |
| Distance From Centerline to Flat | 0.750 INCHES NOMINAL IN |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.120 INCHES NOMINAL IN |
| Shoulder Diameter | 0.960 INCHES MINIMUM AND 0.970 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 1.300 INCHES NOMINAL IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Rib Length | 0.540 INCHES NOMINAL IN |
| Rib Minor Diameter | 1.178 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 1.312 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 2A A |
| Material | STEEL OVERALL |
| Thread Series Designator | UN |
| Head Diameter | 2.000 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 |
NSN 5306-01-039-6637 is a Bolt,ribbed Shoulder, manufactured by Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-039-6637 has 2 manufacturer part numbers on file: 12008318 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate), 12008318 (Army, United States Department of the Dba Rock Island Arsenal Jmtc).
Key specifications for 12008318: Head Height: 0.380 INCHES NOMINAL IN; Rib Included Angle: 45.0 DEGREES NOMINAL; Fastener Length: 2.820 INCHES NOMINAL IN; Shoulder Length: 0.760 INCHES NOMINAL FIRST SHOULDER IN. 19 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.