The Screw,close Tolerance, cataloged under National Stock Number 5305-01-345-5343, 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 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-345-5343 |
| Primary Part Number | HT271A5-9M |
| 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 |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 1.077 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN |
| Thread Length | 0.531 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Features Provided | O RING AND CETYL ALCOHOL LUBRICANT AND DRY FILM LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | TITANIUM ALLOY UNS R56400 FASTENER |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.6287 INCHES MINIMUM AND 0.6335 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 |
|---|---|
| ST3M430V5-9ASM | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT271A5-9M PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT271A5-9M PRIMARY | Hi-Shear Corporation (USA) |
| HT8137-5-9ASM | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 110179-5-9ASM | 5/2 Secondary reference U.S. Government activity |
| BM33024V5-9UM | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT8137-5-9ASM | 5/9 Secondary reference U.S. Government activity |
| ST3M430V5-9ASM | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M430V5-9ASM | 5/2 Secondary reference U.S. Government activity |
| ST3M430V5-9ASM | 5/9 Secondary reference Fte Services Inc |
| BM33024V5-9UM | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-345-5343 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-345-5343 has 4 manufacturer part numbers on file: ST3M430V5-9ASM (Sps Technologies Ltd, Tj Brooks Division), HT271A5-9M (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT271A5-9M (Hi-Shear Corporation), HT8137-5-9ASM (Howmet Global Fastening Systems Inc).
Key specifications for HT271A5-9M: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 1.077 INCHES MINIMUM AND 1.124 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.