The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-01-139-6784, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-139-6784 |
| Primary Part Number | KLB49373-3-1 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.064 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN |
| Fastener Length | 0.756 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN |
| Shoulder Length | 0.157 INCHES MINIMUM AND 0.167 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 1.910 INCHES MINIMUM AND 1.925 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.604 INCHES NOMINAL IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Chamfer Angle | 45.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Rib Quantity | 12 |
| Head Diameter | 0.357 INCHES MINIMUM AND 0.377 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 |
|---|---|
| KLB49373-3-1 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 4032T11P05 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 5306-01-139-6784 is a Bolt,ribbed Shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-139-6784 has 1 manufacturer part number on file: KLB49373-3-1 (Howmet Global Fastening Systems Inc).
Key specifications for KLB49373-3-1: Head Height: 0.064 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN; Fastener Length: 0.756 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN; Shoulder Length: 0.157 INCHES MINIMUM AND 0.167 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 1.910 INCHES MINIMUM AND 1.925 INCHES MAXIMUM FIRST SHOULDER IN. 15 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.