The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-379-1480, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 12 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-379-1480 |
| Primary Part Number | 3-56326-501 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok |
| Status | ACTIVE |
| Head Height | 0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN |
| Fastener Length | 1.120 INCHES NOMINAL IN |
| Thread Length | 0.320 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Criticality Code Justification | ANEE |
| Material Document and Classification | MIL-S-6050 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN |
| Width Between Flats | 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 8630 OR STEEL COMP 4130 OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.960 INCHES NOMINAL 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 |
|---|---|
| 3-56326-501 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| 3-56326-501 | Hi-Shear Corporation (USA) |
| 3-56326-501 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| 3-56326-501 | The Boeing Company Div Defense (USA) |
| 3-56326-501 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| 3-56326-501 | Howmet Global Fastening Systems Inc (USA) |
| 3-56326-501 | West Coast Aerospace, Inc. (USA) |
| 3-56326-501 | Federal Manufacturing Corp (USA) |
| 3-56326-501 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3-56326-501 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3-56326-501 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3-56326-501 | Heartland Precision Fasteners Inc (USA) |
| Reference | Meaning |
|---|---|
| 3-56326-501 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-379-1480 is a Bolt,close Tolerance, manufactured by Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-379-1480 has 12 manufacturer part numbers on file: 3-56326-501 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), 3-56326-501 (Hi-Shear Corporation), 3-56326-501 (Howmet Global Fastening Systems Inc Div City of Industry Operations), 3-56326-501 (The Boeing Company Div Defense), 3-56326-501 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries) and 7 more.
Key specifications for 3-56326-501: Head Height: 0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN; Fastener Length: 1.120 INCHES NOMINAL IN; Thread Length: 0.320 INCHES NOMINAL IN; Shank Unthreaded Hole Diameter: 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE 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.