The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-432-9779, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Reliable Tool & Machine Company, Inc.. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-432-9779 |
| Primary Part Number | ST-504 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Reliable Tool & Machine Company, Inc. |
| Status | ACTIVE |
| Head Height | 0.656 INCHES NOMINAL IN |
| Fastener Length | 2.094 INCHES NOMINAL IN |
| Shoulder Length | 0.656 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.606 INCHES MINIMUM AND 0.612 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 1.297 INCHES MINIMUM IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Material Document and Classification | SAE J429, GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT FILLISTER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Rib Quantity | 1 |
| Head Diameter | 0.785 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 |
|---|---|
| ST-504 PRIMARY | Reliable Tool & Machine Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST-5404 | 5/9 Secondary reference Reliable Tool & Machine Company, Inc. |
NSN 5306-01-432-9779 is a Bolt,ribbed Shoulder, manufactured by Reliable Tool & Machine Company, Inc., classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-432-9779 has 1 manufacturer part number on file: ST-504 (Reliable Tool & Machine Company, Inc.).
Key specifications for ST-504: Head Height: 0.656 INCHES NOMINAL IN; Fastener Length: 2.094 INCHES NOMINAL IN; Shoulder Length: 0.656 INCHES NOMINAL FIRST SHOULDER IN; Shoulder Diameter: 0.606 INCHES MINIMUM AND 0.612 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.