The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-026-5777, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-026-5777 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Fastener Length | 2.300 INCHES MINIMUM AND 2.310 INCHES MAXIMUM IN |
| Shoulder Length | 0.775 INCHES MINIMUM AND 0.785 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-Z-325,CL 2 FED SPEC 1ST TREATMENT RESPONSE AND QQ-Z-325,CL 2 FED SPEC 2ND TREATMENT RESPONSE OR QQ-P-416,CL 2 FED SPEC 3RD TREATMENT RESPONSE AND QQ-P-416,CL 2 FED SPEC 4TH TREATMENT RESPONSE OVERALL |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.520 INCHES MINIMUM AND 0.525 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 1.380 INCHES MINIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 322.0 BRINELL STANDARD MINIMUM AND 363.0 BRINELL STANDARD MAXIMUM OVERALL |
| Material Document and Classification | ASTM A547 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Rib Length | 0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Features Provided | CASEHARDENED |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.550 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN |
| Surface Treatment | ZINC AND CHROMATE OR CADMIUM AND CHROMATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 1335 OR STEEL COMP 1340 OR STEEL COMP 4037 OR STEEL COMP 4135 OR STEEL COMP 8637 OR STEEL COMP 8640 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Rib Quantity | 35 |
| Head Diameter | 0.990 INCHES MINIMUM AND 1.010 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 |
|---|---|
| MS51948-5 | 2/2 Government specification standardization U.S. Government activity |
NSN 5306-01-026-5777 is a Bolt,ribbed Shoulder, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-026-5777: Head Height: 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN; Fastener Length: 2.300 INCHES MINIMUM AND 2.310 INCHES MAXIMUM IN; Shoulder Length: 0.775 INCHES MINIMUM AND 0.785 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-Z-325,CL 2 FED SPEC 1ST TREATMENT RESPONSE AND QQ-Z-325,CL 2 FED SPEC 2ND TREATMENT RESPONSE OR QQ-P-416,CL 2 FED SPEC 3RD TREATMENT RESPONSE AND QQ-P-416,CL 2 FED SPEC 4TH 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.