The Bolt,shoulder, cataloged under National Stock Number 5306-00-326-7660, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-326-7660 |
| Primary Part Number | 2-73843-1 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Head Height | 0.100 INCHES NOMINAL IN |
| Fastener Length | 2.220 INCHES MINIMUM AND 2.230 INCHES MAXIMUM IN |
| Shoulder Length | 0.755 INCHES NOMINAL SECOND SHOULDER IN |
| Shoulder Length | 0.910 INCHES MINIMUM AND 0.920 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.3738 INCHES MINIMUM AND 0.3743 INCHES MAXIMUM SECOND SHOULDER IN |
| Shoulder Diameter | 0.4990 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.255 INCHES MINIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 53.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.076 INCHES NOMINAL FIRST HOLE IN |
| Material Document and Classification | MIL-S-5000 COND C4 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | SQUARE |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.750 INCHES NOMINAL IN |
| Locking Feature | PELLET THREADS |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.120 INCHES MINIMUM AND 2.130 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 | F |
| Part Number | Manufacturer |
|---|---|
| 2-73843-1 | Skyspares Parts Inc (USA) |
| 2-73843-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 2-73843-1 | 5/9 Secondary reference Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector |
| 2-73843-1 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
NSN 5306-00-326-7660 is a Bolt,shoulder, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-326-7660 has 2 manufacturer part numbers on file: 2-73843-1 (Skyspares Parts Inc), 2-73843-1 (Northrop Grumman Systems Corporation).
Key specifications for 2-73843-1: Head Height: 0.100 INCHES NOMINAL IN; Fastener Length: 2.220 INCHES MINIMUM AND 2.230 INCHES MAXIMUM IN; Shoulder Length: 0.755 INCHES NOMINAL SECOND SHOULDER IN; Shoulder Length: 0.910 INCHES MINIMUM AND 0.920 INCHES MAXIMUM FIRST SHOULDER IN. 22 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.