The Screw,close Tolerance, cataloged under National Stock Number 5305-01-538-3391, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-538-3391 |
| Primary Part Number | HT4041-7-17-8 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Fastener Length | 1.609 INCHES MINIMUM AND 1.639 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.052 INCHES MINIMUM AND 1.072 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 | 0.612 INCHES MINIMUM AND 0.672 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 |
|---|---|
| HT4041-7-17-8 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4041-7-17-8 PRIMARY | Hi-Shear Corporation (USA) |
| HT4041-7-17-8 PRIMARY | Huck International, Inc (USA) |
| HT4041-7-17-8 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4041-7-17-8 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M707-7-17-8 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| WC4041-7-17-8 PRIMARY | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3M707-7-17-8 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4041-7-17-8 | 5/9 Secondary reference Sps Technologies Inc |
| 3M707 | D/9 Drawing number reference only The Boeing Company Div Defense |
| 10317038 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-538-3391 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-538-3391 has 7 manufacturer part numbers on file: HT4041-7-17-8 (Howmet Global Fastening Systems Inc), HT4041-7-17-8 (Hi-Shear Corporation), HT4041-7-17-8 (Huck International, Inc), HT4041-7-17-8 (Sps Technologies, Llc Dba PB Fasteners), HT4041-7-17-8 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 2 more.
2 possible matches (shared part number, not a government interchangeability claim): 5305-01-701-0737, 5305-01-703-2357. Verify interchangeability with system specifications before substitution.
Key specifications for HT4041-7-17-8: Fastener Length: 1.609 INCHES MINIMUM AND 1.639 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.500 INCHES NOMINAL IN; Material Document and Classification: AMS 5629 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.