The Screw,close Tolerance, cataloged under National Stock Number 5305-01-008-4197, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-008-4197 |
| Primary Part Number | HT4025L4-16 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 1.454 INCHES MINIMUM AND 1.484 INCHES MAXIMUM IN |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| 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 | 0.497 INCHES MINIMUM AND 0.507 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 |
|---|---|
| ST3M454-4L16 | Houston Precision Fasteners I Lp (USA) |
| HT4025L4-16 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| WC4025L-4-16 | West Coast Aerospace, Inc. (USA) |
| HT4025L4-16 PRIMARY | Hi-Shear Corporation (USA) |
| HT4025L4-16 | Howmet Global Fastening Systems Inc (USA) |
| HT4025L4-16 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M454-4L16 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M454-4L16 | Heartland Precision Fasteners Inc (USA) |
| ST3M454-4L16 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4025L4-16 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4025L4-16 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M454-4L16 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4025L4-16 | Huck International, Inc (USA) |
| 11905-4L16 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M454-4L16 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| HT4025L4-16 | 5/9 Secondary reference U.S. Government activity |
| HT4025L4-16 | 3/2 Design control — primary reference U.S. Government activity |
| HT4025L4-16 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-008-4197 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-008-4197 has 15 manufacturer part numbers on file: ST3M454-4L16 (Houston Precision Fasteners I Lp), HT4025L4-16 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), WC4025L-4-16 (West Coast Aerospace, Inc.), HT4025L4-16 (Hi-Shear Corporation), HT4025L4-16 (Howmet Global Fastening Systems Inc) and 10 more.
Key specifications for HT4025L4-16: Fastener Length: 1.454 INCHES MINIMUM AND 1.484 INCHES MAXIMUM IN; Thread Length: 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN; Material Document and Classification: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.250 INCHES 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.