The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-486-1798, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is S & L Aerospace Metals Llc. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-486-1798 |
| Primary Part Number | A51M12548-11 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | S & L Aerospace Metals Llc |
| Status | ACTIVE |
| Head Height | 0.188 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-8837 TYPE 2 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.531 INCHES MINIMUM IN |
| 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 | 0.437 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.907 INCHES NOMINAL IN |
| Width Between Flats | 0.615 INCHES NOMINAL IN |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Test Data Document | 81349-MIL-I-6868 STANDARD (INCLUDES INDUSTRY OR ASSOCIATION STANDARDS, INDIVIDUAL MANUFACTUREER STANDARDS, ETC.). |
| Thread Quantity Per Inch | 20 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.238 INCHES NOMINAL FIRST HOLE IN |
| Head Diameter | 0.750 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 | F |
| Part Number | Manufacturer |
|---|---|
| A51M12548-11 | S & L Aerospace Metals Llc (USA) |
| Reference | Meaning |
|---|---|
| A51M12548-11 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| A51M12548-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51M12548-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 5306-00-486-1798 is a Bolt,close Tolerance, manufactured by S & L Aerospace Metals Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-486-1798 has 1 manufacturer part number on file: A51M12548-11 (S & L Aerospace Metals Llc).
Key specifications for A51M12548-11: Head Height: 0.188 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-8837 TYPE 2 MIL STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.531 INCHES MINIMUM IN; Hardness Rating: 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL. 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.