The Clamp,block, cataloged under National Stock Number 5340-01-501-0541, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Sonfarrel Inc.. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-501-0541 |
| Primary Part Number | ST9M590-6P |
| Item Name | Clamp,block |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Sonfarrel Inc. |
| Status | ACTIVE |
| Clamping Hole Quantity | 11 |
| Criticality Code Justification | AGAVAGAV |
| Clamping Hole Diameter | 0.391 INCHES MINIMUM AND 0.395 INCHES MAXIMUM ALL HOLES IN |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| ST9M590-6P | Harlow Aerostructures, Llc (USA) |
| ST9M590-6P PRIMARY | Sonfarrel Inc. (USA) |
| ST9M590-6P | The Boeing Company Div Defense (USA) |
NSN 5340-01-501-0541 is a Clamp,block, manufactured by Sonfarrel Inc., classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-501-0541 has 3 manufacturer part numbers on file: ST9M590-6P (Harlow Aerostructures, Llc), ST9M590-6P (Sonfarrel Inc.), ST9M590-6P (The Boeing Company Div Defense).
Key specifications for ST9M590-6P: Clamping Hole Quantity: 11; Criticality Code Justification: AGAVAGAV; Overall Length: 1.200 INCHES NOMINAL1.200 INCHES NOMINAL IN; Overall Width: 0.625 INCHES NOMINAL0.625 INCHES NOMINAL IN. 4 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.