The Screw,close Tolerance, cataloged under National Stock Number 5305-00-246-7449, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 19 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-246-7449 |
| Primary Part Number | C623-3-3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.058 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN |
| Fastener Length | 0.510 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN |
| Thread Length | 0.250 INCHES MINIMUM AND 0.362 INCHES MAXIMUM IN |
| Material Document and Classification | NAS621,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.192 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | TITANIUM ALLOY UNS R54520 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.377 INCHES MINIMUM AND 0.384 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 |
|---|---|
| C623-3-3 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| C623-3-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| C623-3-3 | Hi-Shear Corporation (USA) |
| C623-3-3 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| C623-3-3 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| CS92641-3-3 | 5/9 Secondary reference U.S. Government activity |
| C623-3-3 | 5/2 Secondary reference U.S. Government activity |
| C623-3-3 | 5/9 Secondary reference U.S. Government activity |
| C623-3-3 | 5/2 Secondary reference U.S. Government activity |
| VT1043-3-3 | 5/9 Secondary reference U.S. Government activity |
| AIC1024V3-3 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| AIC1024-3-3 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| HR102-3-3 | 5/9 Secondary reference Hi-Shear Corporation |
| BM623-3-3 | 5/9 Secondary reference U.S. Government activity |
| 652478-3-3 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| C623-3-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-00-246-7449 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-246-7449 has 5 manufacturer part numbers on file: C623-3-3 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), C623-3-3 (Sps Technologies, Llc Dba PB Fasteners), C623-3-3 (Hi-Shear Corporation), C623-3-3 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), C623-3-3 (Howmet Global Fastening Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 4720-00-779-4934. Verify interchangeability with system specifications before substitution.
Key specifications for C623-3-3: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.058 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN; Fastener Length: 0.510 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN. 19 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.