The Screw,shoulder, cataloged under National Stock Number 5305-01-048-1138, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Entwistle Company Llc. Government technical data includes 23 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-048-1138 |
| Primary Part Number | 517AS341 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Entwistle Company Llc |
| Status | ACTIVE |
| Head Height | 0.470 INCHES NOMINAL IN |
| Fastener Length | 1.758 INCHES NOMINAL IN |
| Shoulder Length | 0.292 INCHES MINIMUM AND 0.297 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Length | 0.555 INCHES NOMINAL SECOND SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 3,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.668 INCHES MINIMUM AND 0.669 INCHES MAXIMUM SECOND SHOULDER IN |
| Shoulder Diameter | 0.748 INCHES MINIMUM AND 0.750 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.708 INCHES MINIMUM AND 0.738 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.093 INCHES NOMINAL FIRST HOLE IN |
| Material Document and Classification | MIL-S-5626 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.437 INCHES IN |
| Head Style | FILLISTER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4140 OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.148 INCHES NOMINAL FIRST HOLE IN |
| Head Diameter | 0.865 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 | X |
NSN 5305-01-048-1138 is a Screw,shoulder, manufactured by The Entwistle Company Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-048-1138 has 2 manufacturer part numbers on file: 517AS341 (The Entwistle Company Llc), 517AS341 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 517AS341: Head Height: 0.470 INCHES NOMINAL IN; Fastener Length: 1.758 INCHES NOMINAL IN; Shoulder Length: 0.292 INCHES MINIMUM AND 0.297 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Length: 0.555 INCHES NOMINAL SECOND SHOULDER IN. 23 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.