The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-231-5903, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hadco Engineering Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-231-5903 |
| Primary Part Number | 523393 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hadco Engineering Inc |
| Status | ACTIVE |
| Head Height | 0.281 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN |
| Fastener Length | 2.235 INCHES MINIMUM AND 2.297 INCHES MAXIMUM IN |
| Shoulder Length | 1.125 INCHES MINIMUM AND 1.157 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.871 INCHES MINIMUM AND 0.877 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 1.000 INCHES NOMINAL IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Hardness Rating | 20.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | LEFT-HAND |
| Surface Treatment | ZINC OVERALL |
| Minimum Tensile Strength | 120000 POUNDS PER SQUARE INCH LBS |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 1038 OR STEEL COMP 1035 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 1.125 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 |
|---|---|
| 523393 PRIMARY | Hadco Engineering Inc (USA) |
| Reference | Meaning |
|---|---|
| 523408 | 5/9 Secondary reference Axeline Industries Inc |
NSN 5306-01-231-5903 is a Bolt,ribbed Shoulder, manufactured by Hadco Engineering Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-231-5903 has 1 manufacturer part number on file: 523393 (Hadco Engineering Inc).
Key specifications for 523393: Head Height: 0.281 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN; Fastener Length: 2.235 INCHES MINIMUM AND 2.297 INCHES MAXIMUM IN; Shoulder Length: 1.125 INCHES MINIMUM AND 1.157 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.871 INCHES MINIMUM AND 0.877 INCHES MAXIMUM FIRST SHOULDER IN. 16 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.