The Bolt,shoulder, cataloged under National Stock Number 5306-01-625-0771, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-625-0771 |
| Primary Part Number | MB148C-5-16A |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN |
| Fastener Length | 1.430 INCHES MINIMUM AND 1.450 INCHES MAXIMUM IN |
| Shoulder Length | 0.042 INCHES MINIMUM AND 0.083 INCHES MAXIMUM ALL SHOULDERS IN |
| Surface Treatment Document and Classification | AMS 2700 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.3025 INCHES MINIMUM AND 0.3125 INCHES MAXIMUM ALL SHOULDERS IN |
| Thread Length | 0.430 INCHES NOMINAL IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Material Document and Classification | AMS 5731 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.3125 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 26512-GB511DL MANUFACTURERS STANDARD |
| Width Between Flats | 0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| GB511DL5-16AC | Northrop Grumman Systems Corporation (USA) |
| MB148C-5-16A PRIMARY | Hi-Shear Corporation (USA) |
| AIC1295C5-16A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| 121503-5C16A | 3/2 Design control — primary reference U.S. Government activity |
| 121503-5-16AC | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-625-0771 is a Bolt,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-625-0771 has 3 manufacturer part numbers on file: GB511DL5-16AC (Northrop Grumman Systems Corporation), MB148C-5-16A (Hi-Shear Corporation), AIC1295C5-16A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for MB148C-5-16A: Head Height: 0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN; Fastener Length: 1.430 INCHES MINIMUM AND 1.450 INCHES MAXIMUM IN; Shoulder Length: 0.042 INCHES MINIMUM AND 0.083 INCHES MAXIMUM ALL SHOULDERS IN; Surface Treatment Document and Classification: AMS 2700 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.