The Screw,close Tolerance, cataloged under National Stock Number 5305-01-195-7945, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-195-7945 |
| Primary Part Number | HT271A5-5 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.0878 INCHES MINIMUM AND 0.0899 INCHES MAXIMUM IN |
| Fastener Length | 0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN |
| Thread Length | 0.506 INCHES MINIMUM AND 0.573 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4967,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 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 OVERALL |
| 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 |
|---|---|
| HT271A5-5 PRIMARY | Hi-Shear Corporation (USA) |
| HT8137-5AS | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT271A5-5 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| 110179-5-5AS | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba PB Fasteners |
| HT8137-5-5AS | 5/9 Secondary reference U.S. Government activity |
| BM33024V5-5U | 5/9 Secondary reference U.S. Government activity |
| HT8137-5AS | 3/2 Design control — primary reference U.S. Government activity |
| ST3M430V5-5AS | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 110179-5-5AS | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-195-7945 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-195-7945 has 3 manufacturer part numbers on file: HT271A5-5 (Hi-Shear Corporation), HT8137-5AS (Sps Technologies Ltd, Tj Brooks Division), HT271A5-5 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for HT271A5-5: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.0878 INCHES MINIMUM AND 0.0899 INCHES MAXIMUM IN; Fastener Length: 0.828 INCHES MINIMUM AND 0.875 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.