The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-00-448-3997, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Meritor Heavy Vehicle Systems, Llc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-448-3997 |
| Primary Part Number | 20X1253 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Meritor Heavy Vehicle Systems, Llc |
| Status | ACTIVE |
| Head Height | 0.312 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN |
| Fastener Length | 3.375 INCHES NOMINAL IN |
| Shoulder Length | 0.312 INCHES MINIMUM AND 1.688 INCHES MAXIMUM FIRST SHOULDER IN |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.562 INCHES NOMINAL IN |
| Shoulder Diameter | 0.798 INCHES MINIMUM AND 0.808 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.906 INCHES MINIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | T AND A DIV B14 GRADE 8 78500 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Rib Length | 0.500 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.810 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN |
| Nonstandard Thread Pitch Diameter | +0.7044 TO 0.7084 INCHES IN |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 1.375 INCHES NOMINAL 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 |
|---|---|
| 20X1253 PRIMARY | Meritor Heavy Vehicle Systems, Llc (USA) |
| 20X1253 | Meritor Industrial Products, Llc (USA) |
| Reference | Meaning |
|---|---|
| 5306004483997 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
NSN 5306-00-448-3997 is a Bolt,ribbed Shoulder, manufactured by Meritor Heavy Vehicle Systems, Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-448-3997 has 2 manufacturer part numbers on file: 20X1253 (Meritor Heavy Vehicle Systems, Llc), 20X1253 (Meritor Industrial Products, Llc).
Key specifications for 20X1253: Head Height: 0.312 INCHES MINIMUM AND 0.402 INCHES MAXIMUM IN; Fastener Length: 3.375 INCHES NOMINAL IN; Shoulder Length: 0.312 INCHES MINIMUM AND 1.688 INCHES MAXIMUM FIRST SHOULDER IN; Distance From Largest Diameter of Bearing Surface of Head to Ribs: 0.562 INCHES NOMINAL IN. 18 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.