The Screw,close Tolerance, cataloged under National Stock Number 5305-01-477-5959, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies Llc Dba PB Fasteners Div PB Fasteners. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-477-5959 |
| Primary Part Number | TX1027V4-6A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Point Diameter | 0.425 INCHES NOMINAL IN |
| Fastener Length | 0.785 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN |
| Thread Length | 0.420 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN |
| Spline Major Diameter | 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.249 INCHES NOMINAL IN |
| Internal Drive Style | TORX |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.385 INCHES MINIMUM AND 0.394 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 |
|---|---|
| 3M1170V4-6A | Heartland Precision Fasteners Inc (USA) |
| 3M1170V4-6A | Houston Precision Fasteners I Lp (USA) |
| WC1170V4-6A | West Coast Aerospace, Inc. (USA) |
| GS1014V4-6A | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M1170V4-6A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M1170V4-6A | Saturn Fasteners Inc (USA) |
| TX1027V4-6A | Huck International, Inc (USA) |
| TX1027V4-6A | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| TX1027V4-6A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1170V4-6A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M1170V4-6A | The Boeing Company Div Defense (USA) |
| 3M1169V4-6A | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| TX1027V4-6A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 11845V4-6A | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M1170V4-6A | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| TX1027V4-6A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| TX1027V4-6A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027V4-6A PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| TX1027V4-6A | 3/2 Design control — primary reference U.S. Government activity |
| TX1027V4-6A | 5/2 Secondary reference U.S. Government activity |
| TX1027V4-6A | 5/9 Secondary reference Sps Technologies Inc |
| TX1027V4-6A | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
NSN 5305-01-477-5959 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-477-5959 has 18 manufacturer part numbers on file: 3M1170V4-6A (Heartland Precision Fasteners Inc), 3M1170V4-6A (Houston Precision Fasteners I Lp), WC1170V4-6A (West Coast Aerospace, Inc.), GS1014V4-6A (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), 3M1170V4-6A (Fastener Innovation Technology, Inc. Dba F I T) and 13 more.
Key specifications for TX1027V4-6A: Point Diameter: 0.425 INCHES NOMINAL IN; Fastener Length: 0.785 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN; Thread Length: 0.420 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN; Spline Major Diameter: 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN. 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.