The Screw,shoulder, cataloged under National Stock Number 5305-01-536-4452, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-536-4452 |
| Primary Part Number | 3M1278E3D8A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Spline Minor Diameter | 0.1105 INCHES MINIMUM AND 0.1125 INCHES MAXIMUM IN |
| Fastener Length | 0.830 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN |
| Shoulder Length | 0.454 INCHES NOMINAL GRIP IN |
| Surface Treatment Document and Classification | MIL-L-87132 TYPE1 GRADE B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM GRIP IN |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Shoulder Shape | ROUND GRIP |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Spline Major Diameter | 0.1540 INCHES MINIMUM AND 0.1560 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | TORX |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | NICKEL ALLOY 718 OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN |
| Head Diameter | 0.294 INCHES MINIMUM AND 0.301 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 | Y |
| Part Number | Manufacturer |
|---|---|
| TX1027E3D8YA | Howmet Global Fastening Systems Inc (USA) |
| TX1027E3D8YA | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 11863E3D8A | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M1278E3D8A PRIMARY | The Boeing Company Div Defense (USA) |
| TX1027E3D8YA | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027E3D8YA | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| TX1027E3D8YA | Hi-Shear Corporation (USA) |
| TX1027E3D8YA | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| TX1027E3D8YA | 5/2 Secondary reference U.S. Government activity |
| TX1027E3D8YA | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-536-4452 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-536-4452 has 8 manufacturer part numbers on file: TX1027E3D8YA (Howmet Global Fastening Systems Inc), TX1027E3D8YA (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 11863E3D8A (Reid Products Inc. Dba Reid Products Inc), 3M1278E3D8A (The Boeing Company Div Defense), TX1027E3D8YA (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 3 more.
Key specifications for 3M1278E3D8A: Spline Minor Diameter: 0.1105 INCHES MINIMUM AND 0.1125 INCHES MAXIMUM IN; Fastener Length: 0.830 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN; Shoulder Length: 0.454 INCHES NOMINAL GRIP IN; Surface Treatment Document and Classification: MIL-L-87132 TYPE1 GRADE B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 25 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.