The Screw,close Tolerance, cataloged under National Stock Number 5305-00-421-7888, 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 16 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-00-421-7888 |
| Primary Part Number | HS2623-4Z7 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Fastener Length | 0.819 INCHES MINIMUM AND 0.866 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MAC P.S.13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM 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 | 28 |
| Material | STEEL 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 |
|---|---|
| 3M263-4-7 | Huck International, Inc (USA) |
| HS2623-4Z7 PRIMARY | Huck International, Inc (USA) |
| HT195-4-7 PRIMARY | Hi-Shear Corporation (USA) |
| 3M263-4-7 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT195-4-7 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| 66117H4-7 | 3/2 Design control — primary reference U.S. Government activity |
| 3M263-4-7 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HS2623-4Z7 | 5/9 Secondary reference U.S. Government activity |
| 3M263-4-7 | 5/2 Secondary reference U.S. Government activity |
| 66117H4-7 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5305-00-421-7888 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-421-7888 has 5 manufacturer part numbers on file: 3M263-4-7 (Huck International, Inc), HS2623-4Z7 (Huck International, Inc), HT195-4-7 (Hi-Shear Corporation), 3M263-4-7 (Sps Technologies, Llc Dba PB Fasteners), HT195-4-7 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for HS2623-4Z7: Fastener Length: 0.819 INCHES MINIMUM AND 0.866 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MAC P.S.13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.250 INCHES IN. 16 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.