The Bolt,shoulder, cataloged under National Stock Number 5306-00-003-0583, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp. Government technical data includes 18 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-003-0583 |
| Primary Part Number | A51H20614-11 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp |
| Status | ACTIVE |
| Head Height | 0.156 INCHES NOMINAL IN |
| Shoulder Length | 1.890 INCHES MINIMUM AND 1.895 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.5625 INCHES MINIMUM AND 0.5630 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.430 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE THREADS |
| Surface Treatment | CHROMIUM GRIP |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.195 INCHES MINIMUM AND 2.200 INCHES MAXIMUM FIRST HOLE 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 |
|---|---|
| A51H20614-11 | Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp (USA) |
| Reference | Meaning |
|---|---|
| A51H20614-11 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| A51H20614-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51H20614-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51H20614-11 | 5/9 Secondary reference Tek Precision Co Limited |
NSN 5306-00-003-0583 is a Bolt,shoulder, manufactured by Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-003-0583 has 1 manufacturer part number on file: A51H20614-11 (Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp).
Key specifications for A51H20614-11: Head Height: 0.156 INCHES NOMINAL IN; Shoulder Length: 1.890 INCHES MINIMUM AND 1.895 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.5625 INCHES MINIMUM AND 0.5630 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.430 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN. 18 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.