The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-00-948-1356, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-948-1356 |
| Primary Part Number | 524326 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Head Height | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Fastener Length | 1.070 INCHES MINIMUM AND 1.090 INCHES MAXIMUM IN |
| Distance From Centerline to Flat | 0.165 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN |
| Thread Length | 0.488 INCHES MINIMUM AND 0.548 INCHES MAXIMUM IN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | AMS 5616 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Rib Length | 0.150 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Rib Minor Diameter | 0.289 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.317 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Rib Quantity | 36 |
| Head Diameter | 0.620 INCHES MINIMUM AND 0.640 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 |
|---|---|
| 524326 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 524326 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| 524326 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 524326 | 5/9 Secondary reference U.S. Government activity |
| 524326 | 5/9 Secondary reference Necchi Spa |
| 524326 | 5/9 Secondary reference U.S. Government activity |
| 524326 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 524326 | 5/9 Secondary reference U.S. Government activity |
| 524326 | 5/9 Secondary reference Mnr Tool Engineering Inc |
| 524326 | 5/9 Secondary reference Center Grove Mfg Inc |
NSN 5306-00-948-1356 is a Bolt,ribbed Shoulder, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-948-1356 has 2 manufacturer part numbers on file: 524326 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 524326 (Rtx Corporation Div Pratt & Whitney).
Key specifications for 524326: Head Height: 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN; Fastener Length: 1.070 INCHES MINIMUM AND 1.090 INCHES MAXIMUM IN; Distance From Centerline to Flat: 0.165 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN; Distance From Largest Diameter of Bearing Surface of Head to Ribs: 0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM 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.