The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-628-5591, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-628-5591 |
| Primary Part Number | TX1027D6-8A |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Head Height | 0.077 INCHES NOMINAL IN |
| Fastener Length | 1.563 INCHES MINIMUM AND 1.593 INCHES MAXIMUM IN |
| Thread Length | 0.578 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.500 INCHES NOMINAL IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Nonstandard Thread Pitch Diameter | +0.3450 TO 0.3479 INCHES IN |
| Internal Drive Style | TORX |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.5504 INCHES MINIMUM AND 0.5604 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 |
|---|---|
| TX1027D6-8A PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027D6-8A PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M1170D6-8A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| 3M1170D6-8A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| TX1027D6-8A PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| GS1014D6-8A PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| WC1170D6-8A PRIMARY | West Coast Aerospace, Inc. (USA) |
| 3M1170D6-8A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M1170D6-8A PRIMARY | Saturn Fasteners Inc (USA) |
| TX1027D6-8A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 11845D6-8A PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| TX1027D6-8A PRIMARY | Hi-Shear Corporation (USA) |
| 3M1170D6-8A PRIMARY | Houston Precision Fasteners I Lp (USA) |
| Reference | Meaning |
|---|---|
| TX1027D6-8A | 5/1 Secondary reference Pruftechnik Dieter Busch Aktiengesellschaft |
| 3M1170D6-8A | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| TX1027D6-8A | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-628-5591 is a Bolt,close Tolerance, manufactured by Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-628-5591 has 13 manufacturer part numbers on file: TX1027D6-8A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), TX1027D6-8A (Sps Technologies, Llc Dba PB Fasteners), 3M1170D6-8A (Heartland Precision Fasteners Inc), 3M1170D6-8A (Valley-Todeco, Inc. Dba Arconic Fastening Systems), TX1027D6-8A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 8 more.
Key specifications for TX1027D6-8A: Head Height: 0.077 INCHES NOMINAL IN; Fastener Length: 1.563 INCHES MINIMUM AND 1.593 INCHES MAXIMUM IN; Thread Length: 0.578 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.