The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-01-344-5526, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Legacy Am&m. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-344-5526 |
| Primary Part Number | L4100249-003 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Legacy Am&m |
| Status | ACTIVE |
| Extended Washer Thickness | 0.178 INCHES NOMINAL IN |
| Head Height | 0.711 INCHES NOMINAL IN |
| Fastener Length | 2.985 INCHES MINIMUM AND 3.015 INCHES MAXIMUM IN |
| Extended Washer Diameter | 1.220 INCHES MINIMUM AND 1.230 INCHES MAXIMUM IN |
| Thread Length | 1.388 INCHES NOMINAL IN |
| Hole Configuration Style | DOUBLE HEXAGON LONGITUDINAL HOLE |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.663 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.803 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 1.597 INCHES MINIMUM AND 1.627 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | NICKEL ALLOY 718 OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.410 INCHES MINIMUM AND 0.450 INCHES MAXIMUM 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 |
|---|---|
| L4100249-003 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| L4100249-003 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| L4100249-003 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| L4100249-003 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| L4100249-003 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| L4100249-003 | Acufast Aircraft Products (USA) |
| L4100249-003 PRIMARY | The Boeing Company Div Legacy Am&m (USA) |
| L4100249-003 | Howmet Global Fastening Systems Inc (USA) |
| L4100249-003 | Hi-Shear Corporation (USA) |
| L4100249-003 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| L4100249-003 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-344-5526 is a Bolt,externally Relieved Body, manufactured by The Boeing Company Div Legacy Am&m, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-344-5526 has 10 manufacturer part numbers on file: L4100249-003 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), L4100249-003 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), L4100249-003 (Sps Technologies, Llc Dba PB Fasteners), L4100249-003 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), L4100249-003 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 5 more.
Key specifications for L4100249-003: Extended Washer Thickness: 0.178 INCHES NOMINAL IN; Head Height: 0.711 INCHES NOMINAL IN; Fastener Length: 2.985 INCHES MINIMUM AND 3.015 INCHES MAXIMUM IN; Extended Washer Diameter: 1.220 INCHES MINIMUM AND 1.230 INCHES MAXIMUM IN. 21 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.