The Screw,shoulder, cataloged under National Stock Number 5305-01-536-4449, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Fastener Innovation Technology, Inc. Dba F I T. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 17 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-536-4449 |
| Primary Part Number | 3M1278E4D8A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Fastener Innovation Technology, Inc. Dba F I T |
| Status | ACTIVE |
| Spline Minor Diameter | 0.1105 INCHES MINIMUM AND 0.1125 INCHES MAXIMUM IN |
| Fastener Length | 0.9100 INCHES MINIMUM AND 0.9400 INCHES MAXIMUM IN |
| Shoulder Length | 0.4400 INCHES NOMINAL GRIP IN |
| Surface Treatment Document and Classification | MIL-L-87132 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2802 INCHES MINIMUM AND 0.2807 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 | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM IN |
| Head Diameter | 0.388 INCHES MINIMUM AND 0.395 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 |
|---|---|
| 3M1278E4D8A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| TX1027E4D8YA | Hi-Shear Corporation (USA) |
| 3M1278E4D8A PRIMARY | Saturn Fasteners Inc (USA) |
| 3M1278E4D8A PRIMARY | The Boeing Company Div Defense (USA) |
| 11863E4D8A | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M1278E4D8A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M1278E4D8A | Camcar Llc Div Camcar Llc (USA) |
| TX1027E4D8YA | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| TX1027E4D8YA | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M1278E4D8A PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| TX1027E4D8YA | Sps Technologies, Llc Dba PB Fasteners (USA) |
| TX1027E4D8YA PRIMARY | Huck International, Inc (USA) |
| TX1027E4D8YA | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1278E4D8A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| TX1027E4D8YA | Howmet Global Fastening Systems Inc (USA) |
| WC1278E4D8A | West Coast Aerospace, Inc. (USA) |
| 3M1278E4D8A | Houston Precision Fasteners I Lp (USA) |
| Reference | Meaning |
|---|---|
| TX1027E4D8YA | 3/2 Design control — primary reference U.S. Government activity |
| TX1027E4D8YA | 5/2 Secondary reference U.S. Government activity |
| TX1027E4D8YA | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-536-4449 is a Screw,shoulder, manufactured by Fastener Innovation Technology, Inc. Dba F I T, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-536-4449 has 17 manufacturer part numbers on file: 3M1278E4D8A (Fastener Innovation Technology, Inc. Dba F I T), TX1027E4D8YA (Hi-Shear Corporation), 3M1278E4D8A (Saturn Fasteners Inc), 3M1278E4D8A (The Boeing Company Div Defense), 11863E4D8A (Reid Products Inc. Dba Reid Products Inc) and 12 more.
Key specifications for 3M1278E4D8A: Spline Minor Diameter: 0.1105 INCHES MINIMUM AND 0.1125 INCHES MAXIMUM IN; Fastener Length: 0.9100 INCHES MINIMUM AND 0.9400 INCHES MAXIMUM IN; Shoulder Length: 0.4400 INCHES NOMINAL GRIP IN; Surface Treatment Document and Classification: MIL-L-87132 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.