The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-049-4051, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Valley-Todeco, Inc. Dba Arconic Fastening Systems. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-049-4051 |
| Primary Part Number | BACB30LT5U20 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Fastener Length | 1.689 INCHES MINIMUM AND 1.719 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.429 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Width Between Flats | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| BACB30LT5U20 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LT5U20 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LT5U20 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| BACB30LT5U20 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LT5U20 | Federal Manufacturing Corp (USA) |
| BACB30LT5U20 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LT5U20 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30LT5U20 | 5/9 Secondary reference U.S. Government activity |
| BACB30LT5U20 | 5/2 Secondary reference U.S. Government activity |
| BACB30LT5U20 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-049-4051 is a Bolt,close Tolerance, manufactured by Valley-Todeco, Inc. Dba Arconic Fastening Systems, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-049-4051 has 7 manufacturer part numbers on file: BACB30LT5U20 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30LT5U20 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LT5U20 (Howmet Global Fastening Systems Inc. Div Voi-Shan Products), BACB30LT5U20 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LT5U20 (Federal Manufacturing Corp) and 2 more.
Key specifications for BACB30LT5U20: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN. 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.