The Screw,shoulder, cataloged under National Stock Number 5305-01-268-5973, 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 17 specifications, cited from the U.S. Government catalog. The record lists 12 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-268-5973 |
| Primary Part Number | ST3M653C4-10A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN |
| Fastener Length | 1.078 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN |
| Shoulder Length | 0.558 INCHES MINIMUM AND 0.560 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.456 INCHES MINIMUM AND 0.508 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 | X |
| Part Number | Manufacturer |
|---|---|
| HT4020-4-10AX | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4020-4-10AX | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M653C4-10A PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M653C4-10A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-4-10AX | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4020-4-10AX | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 11927C4-10A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-4-10AX | Hi-Shear Corporation (USA) |
| ST3M653C4-10A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M653C4-10A | Houston Precision Fasteners I Lp (USA) |
| ST3M653C4-10A | Heartland Precision Fasteners Inc (USA) |
| WC4020-4-10AX | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-10AX | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4020-4-10AX | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4020-4-10AX | 5/2 Secondary reference U.S. Government activity |
| HT4020-4-10AX | 5/9 Secondary reference U.S. Government activity |
| ST3M653C4-10A | 5/2 Secondary reference U.S. Government activity |
| HT4020-4-10AX | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-268-5973 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-268-5973 has 12 manufacturer part numbers on file: HT4020-4-10AX (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HT4020-4-10AX (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M653C4-10A (The Boeing Company Div Defense), ST3M653C4-10A (Fastener Innovation Technology, Inc. Dba F I T), HT4020-4-10AX (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 7 more.
Key specifications for ST3M653C4-10A: Head Height: 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN; Fastener Length: 1.078 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN; Shoulder Length: 0.558 INCHES MINIMUM AND 0.560 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.