The Screw,close Tolerance, cataloged under National Stock Number 5305-01-512-8293, 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 19 specifications, cited from the U.S. Government catalog. The record lists 17 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-512-8293 |
| Primary Part Number | TX1027C4-20A |
| 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 | 1.660 INCHES MINIMUM AND 1.690 INCHES MAXIMUM IN |
| Thread Length | 0.420 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| 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 | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.249 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| 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 | NICKEL ALLOY 718 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 |
|---|---|
| TX1027C4-20A | Howmet Global Fastening Systems Inc (USA) |
| 3M1170C4-20A | Houston Precision Fasteners I Lp (USA) |
| TX1027C4-20A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| TX1027C4-20A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027C4-20A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M1170C4-20A | The Boeing Company Div Defense (USA) |
| 3M1170C4-20A PRIMARY | Saturn Fasteners Inc (USA) |
| GS1014C4-20A PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 11825C4-20A | Reid Products Inc. Dba Reid Products Inc (USA) |
| TX1027C4-20A | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| 3M1170C4-20A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| 3M1170C4-20A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| TX1027C4-20A PRIMARY | Hi-Shear Corporation (USA) |
| WC1170C4-20A | West Coast Aerospace, Inc. (USA) |
| 3M1170C4-20A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| TX1027C4-20A PRIMARY | Huck International, Inc (USA) |
| 11845C4-20A PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| TX1027C4-20A | 3/2 Design control — primary reference U.S. Government activity |
| TX1027C4-20A | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-512-8293 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-512-8293 has 17 manufacturer part numbers on file: TX1027C4-20A (Howmet Global Fastening Systems Inc), 3M1170C4-20A (Houston Precision Fasteners I Lp), TX1027C4-20A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), TX1027C4-20A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), TX1027C4-20A (Sps Technologies, Llc Dba PB Fasteners) and 12 more.
Key specifications for TX1027C4-20A: Point Diameter: 0.425 INCHES NOMINAL IN; Fastener Length: 1.660 INCHES MINIMUM AND 1.690 INCHES MAXIMUM IN; Thread Length: 0.420 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN; Material Document and Classification: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 19 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.