The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-01-012-9400, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Curtiss-Wright Controls, Inc. Div Actuation Division. Government technical data includes 24 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-012-9400 |
| Primary Part Number | 2057D139 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Curtiss-Wright Controls, Inc. Div Actuation Division |
| Status | ACTIVE |
| Fourth Diameter From Head | 0.300 INCHES NOMINAL IN |
| Head Height | 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN |
| Fastener Length | 1.420 INCHES NOMINAL IN |
| Distance From Centerline to Flat | 0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Thread Length | 0.590 INCHES NOMINAL IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| Criticality Code Justification | AAWC AND AAWE |
| Material Document and Classification | AMS 5628 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.3902 INCHES MINIMUM AND 0.3906 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.460 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 0.730 INCHES NOMINAL IN |
| Head Style | DEE CHAMFER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.333 INCHES MINIMUM AND 0.343 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.405 INCHES MINIMUM AND 0.415 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 4 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 431 OVERALL |
| Distance From Largest Bearing Surface of Head to End of Fourth Diameter | 0.830 INCHES NOMINAL IN |
| Third Diameter From Head | 0.3902 INCHES MINIMUM AND 0.3906 INCHES MAXIMUM IN |
| Thread Series Designator | UNF |
| Head Diameter | 0.655 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 | Y |
| Part Number | Manufacturer |
|---|---|
| 2057D139 PRIMARY | Curtiss-Wright Controls, Inc. Div Actuation Division (USA) |
NSN 5306-01-012-9400 is a Bolt,externally Relieved Body, manufactured by Curtiss-Wright Controls, Inc. Div Actuation Division, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-012-9400 has 1 manufacturer part number on file: 2057D139 (Curtiss-Wright Controls, Inc. Div Actuation Division).
Key specifications for 2057D139: Fourth Diameter From Head: 0.300 INCHES NOMINAL IN; Head Height: 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN; Fastener Length: 1.420 INCHES NOMINAL IN; Distance From Centerline to Flat: 0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN. 24 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.