The Screw,close Tolerance, cataloged under National Stock Number 5305-01-528-8397, 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. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-528-8397 |
| Primary Part Number | TX1027C4-10A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.060 INCHES NOMINAL IN |
| Fastener Length | 1.035 INCHES MINIMUM AND 1.065 INCHES MAXIMUM IN |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Nominal Thread Diameter | 0.249 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.437 INCHES NOMINAL IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Internal Drive Style | CROSS RECESS TYPE IA |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.358 INCHES MINIMUM AND 0.365 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 |
|---|---|
| 3M1170C4-10A | The Boeing Company Div Defense (USA) |
| TX1027C4-10A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027C4-10A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| TX1027C4-10A | Huck International, Inc (USA) |
| 3M1170C4-10A | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| WC1170C4-10A | West Coast Aerospace, Inc. (USA) |
| TX1027C4-10A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| TX1027C4-10A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1170C4-10A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M1170C4-10A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| TX1027C4-10A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| TX1027C4-10A | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| TX1027C4-10A | Hi-Shear Corporation (USA) |
| 3M1170C4-10A | Houston Precision Fasteners I Lp (USA) |
| GS1014C4-10A | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| TX1027C4-10A | 5/9 Secondary reference Sps Technologies Inc |
| TX1027C4-10A | 5/2 Secondary reference U.S. Government activity |
| TX1027C4-10A | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-528-8397 is a Screw,close Tolerance, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-528-8397 has 15 manufacturer part numbers on file: 3M1170C4-10A (The Boeing Company Div Defense), TX1027C4-10A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), TX1027C4-10A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), TX1027C4-10A (Huck International, Inc), 3M1170C4-10A (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc) and 10 more.
Key specifications for TX1027C4-10A: Head Height: 0.060 INCHES NOMINAL IN; Fastener Length: 1.035 INCHES MINIMUM AND 1.065 INCHES MAXIMUM IN; Thread Length: 0.425 INCHES NOMINAL IN; Criticality Code Justification: AGAV. 16 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.