The Screw,close Tolerance, cataloged under National Stock Number 5305-01-129-2199, 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 13 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-129-2199 |
| Primary Part Number | HT4025L7-21 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 1.972 INCHES MINIMUM AND 2.002 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.650 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.880 INCHES MINIMUM AND 0.890 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 |
|---|---|
| 11905-7L21 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4025L7-21 | Howmet Global Fastening Systems Inc (USA) |
| HT4025L7-21 | Huck International, Inc (USA) |
| ST3M454-7L21 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4025L7-21 PRIMARY | Hi-Shear Corporation (USA) |
| HT4025L7-21 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4025L7-21 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M454-7L21 | Houston Precision Fasteners I Lp (USA) |
| HT4025L7-21 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4025L7-21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M454-7L21 | Heartland Precision Fasteners Inc (USA) |
| WC4025L-7-21 PRIMARY | West Coast Aerospace, Inc. (USA) |
| ST3M454-7L21 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4025L-21 | 5/9 Secondary reference U.S. Government activity |
| 10115192 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4025L7-21 | 3/2 Design control — primary reference U.S. Government activity |
| HT4025L7-21 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M454-7L21 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-129-2199 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-129-2199 has 13 manufacturer part numbers on file: 11905-7L21 (Reid Products Inc. Dba Reid Products Inc), HT4025L7-21 (Howmet Global Fastening Systems Inc), HT4025L7-21 (Huck International, Inc), ST3M454-7L21 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), HT4025L7-21 (Hi-Shear Corporation) and 8 more.
Key specifications for HT4025L7-21: Fastener Length: 1.972 INCHES MINIMUM AND 2.002 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.650 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN; Material Document and Classification: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.