The Screw,close Tolerance, cataloged under National Stock Number 5305-00-326-4969, 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 18 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-326-4969 |
| Primary Part Number | HT271-3-4 |
| 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 GRIP |
| Head Height | 0.043 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN |
| Fastener Length | 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Material Document and Classification | NAS 621,6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES MINIMUM |
| 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 | 0.376 INCHES MINIMUM AND 0.381 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 |
|---|---|
| HT271-3-4 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 110179-3-4 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M430V3-4D | Howmet Global Fastening Systems Inc (USA) |
| 110179-3-4 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT271-3-4 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| ST3M430V3-4D | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT8137-3-4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M430V3-4D | 5/2 Secondary reference U.S. Government activity |
| HT8137-3-4 | 5/9 Secondary reference U.S. Government activity |
| 110179-3-4 | 5/9 Secondary reference Sps Technologies Inc |
| BM33024V3-4 | 5/9 Secondary reference Huck International, Inc |
| ST3M430V3-4D | 5/9 Secondary reference U.S. Government activity |
| BM33024V3-4 | 5/9 Secondary reference U.S. Government activity |
| 10125187 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-00-326-4969 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-326-4969 has 5 manufacturer part numbers on file: HT271-3-4 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 110179-3-4 (Sps Technologies Ltd, Tj Brooks Division), ST3M430V3-4D (Howmet Global Fastening Systems Inc), 110179-3-4 (Sps Technologies, Llc Dba PB Fasteners), HT271-3-4 (Hi-Shear Corporation).
Key specifications for HT271-3-4: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.043 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN; Fastener Length: 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN. 18 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.