The Screw,close Tolerance, cataloged under National Stock Number 5305-01-494-9111, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-494-9111 |
| Primary Part Number | HT4020-6-13 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Fastener Length | 1.418 INCHES MINIMUM AND 1.505 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.803 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM AND 0.760 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 |
|---|---|
| ST3M652C6-13D | West Coast Aerospace, Inc. (USA) |
| HT4020-6-13 PRIMARY | Huck International, Inc (USA) |
| HT4020-6-13 | Hi-Shear Corporation (USA) |
| ST3M652C6-13D | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-6-13 | Howmet Global Fastening Systems Inc (USA) |
| ST3M652C6-13D | Howmet Global Fastening Systems Inc (USA) |
| ST3M652C6-13D | Huck International, Inc (USA) |
| HT4020-6-13 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-6-13 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4020-6-13 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST3M652C6-13D | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4020-6-13 | 5/9 Secondary reference Sps Technologies Inc |
| HT4020-6-13 | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-13 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-494-9111 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-494-9111 has 10 manufacturer part numbers on file: ST3M652C6-13D (West Coast Aerospace, Inc.), HT4020-6-13 (Huck International, Inc), HT4020-6-13 (Hi-Shear Corporation), ST3M652C6-13D (Fastener Innovation Technology, Inc. Dba F I T), HT4020-6-13 (Howmet Global Fastening Systems Inc) and 5 more.
Key specifications for HT4020-6-13: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN; Fastener Length: 1.418 INCHES MINIMUM AND 1.505 INCHES MAXIMUM IN. 20 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.