The Clamp,loop, cataloged under National Stock Number 5340-01-632-1980, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Umpco, Inc. Dba Umpco Inc. Government technical data includes 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-632-1980 |
| Primary Part Number | 30-289J21 |
| Item Name | Clamp,loop |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Umpco, Inc. Dba Umpco Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-DTL-5541, CL 2 MIL SPEC SINGLE TREATMENT RESPONSE BAND |
| Style Designator | SINGLE LOOP |
| Material Document and Classification | AMS-QQ-A-250/5 ASSN STD SINGLE MATERIAL RESPONSE BAND |
| Material Document and Classification | MIL-DTL-25988, CL 2, TYPE II, GRADE 50 MIL SPEC SINGLE MATERIAL RESPONSE CUSHION |
| Diameter | 0.199 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN |
| Material Thickness | 0.062 INCHES NOMINAL IN |
| Distance From Loop Center to Tongue End | 1.359 INCHES MINIMUM AND 1.389 INCHES MAXIMUM IN |
| Tongue Hole Type | ROUND, UNTHREADED |
| Center to Center Distance Between Loop and Mounting Hole | 1.141 INCHES MINIMUM AND 1.171 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROSILICONE CLASS FQ CUSHION |
| Material | ALUMINUM ALLOY 2024 BAND |
| Loop Inside Diameter | 1.298 INCHES MINIMUM AND 1.328 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 30-289J21 | Umpco, Inc. Dba Umpco Inc (USA) |
| Reference | Meaning |
|---|---|
| 30-289 | D/9 Drawing number reference only U.S. Government activity |
| 30-289J21 | 5/2 Secondary reference U.S. Government activity |
| 30-289J21 | 5/2 Secondary reference U.S. Government activity |
| 30-289J21 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-01-632-1980 is a Clamp,loop, manufactured by Umpco, Inc. Dba Umpco Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-632-1980 has 1 manufacturer part number on file: 30-289J21 (Umpco, Inc. Dba Umpco Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-632-1981, 5340-01-707-2394. Verify interchangeability with system specifications before substitution.
Key specifications for 30-289J21: Surface Treatment Document and Classification: MIL-DTL-5541, CL 2 MIL SPEC SINGLE TREATMENT RESPONSE BAND; Style Designator: SINGLE LOOP; Material Document and Classification: AMS-QQ-A-250/5 ASSN STD SINGLE MATERIAL RESPONSE BAND; Material Document and Classification: MIL-DTL-25988, CL 2, TYPE II, GRADE 50 MIL SPEC SINGLE MATERIAL RESPONSE CUSHION. 12 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.