The Screw,close Tolerance, cataloged under National Stock Number 5305-01-526-6637, 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 17 specifications, cited from the U.S. Government catalog. The record lists 18 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-526-6637 |
| Primary Part Number | TX1027V4-14A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.063 INCHES NOMINAL IN |
| Fastener Length | 1.410 INCHES MINIMUM AND 1.440 INCHES MAXIMUM IN |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.865 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.357 INCHES MINIMUM AND 0.398 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 | Y |
| Part Number | Manufacturer |
|---|---|
| WC1170V4-14A | West Coast Aerospace, Inc. (USA) |
| TX1027V4-14A PRIMARY | Hi-Shear Corporation (USA) |
| TX1027V4-14A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027V4-14A PRIMARY | Huck International, Inc (USA) |
| TX1027V4-14A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M1170V4-14A | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| 11845V4-14A PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M1170V4-14A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| TX1027V4-14A | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| TX1027V4-14A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M1170V4-14A | Houston Precision Fasteners I Lp (USA) |
| 3M1170V4-14A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M1170V4-14A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M1170V4-14A PRIMARY | Saturn Fasteners Inc (USA) |
| GS1014V4-14A PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M1170V4-14A PRIMARY | The Boeing Company Div Defense (USA) |
| TX1027V4-14A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| TX1027V4-14A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| TX1027V4-14A | 3/2 Design control — primary reference U.S. Government activity |
| TX1027V4-14A | 5/9 Secondary reference Sps Technologies Inc |
| 10328849 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| TX1027V4-14A | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-526-6637 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-526-6637 has 18 manufacturer part numbers on file: WC1170V4-14A (West Coast Aerospace, Inc.), TX1027V4-14A (Hi-Shear Corporation), TX1027V4-14A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), TX1027V4-14A (Huck International, Inc), TX1027V4-14A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 13 more.
Key specifications for TX1027V4-14A: Head Height: 0.063 INCHES NOMINAL IN; Fastener Length: 1.410 INCHES MINIMUM AND 1.440 INCHES MAXIMUM IN; Thread Length: 0.425 INCHES NOMINAL IN; Criticality Code Justification: AGAV. 17 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.