The Clamp,loop, cataloged under National Stock Number 5340-01-349-4986, 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-349-4986 |
| Primary Part Number | S656SS20 |
| Item Name | Clamp,loop |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Umpco, Inc. Dba Umpco Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE BAND |
| Style Designator | SINGLE LOOP |
| Material Document and Classification | MIL-S-5059 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6721 MIL SPEC 2ND MATERIAL RESPONSE BAND |
| Diameter | 0.204 INCHES NOMINAL IN |
| Material Thickness | 0.062 INCHES MINIMUM AND 0.077 INCHES MAXIMUM IN |
| Distance From Loop Center to Tongue End | 1.334 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE BAND |
| Tongue Hole Type | ROUND, UNTHREADED |
| Center to Center Distance Between Loop and Mounting Hole | 1.100 INCHES MINIMUM AND 1.130 INCHES MAXIMUM IN |
| Material | STEEL COMP 302 OR STEEL COMP 321 BAND |
| Material | POLYTETRAFLUOROETHYLENE IMPREGNATED POLYBENZIMIDAZOLE POLYAMIDE FIBERGLASS CUSHION |
| Loop Inside Diameter | 1.250 INCHES NOMINAL 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 |
|---|---|
| S656SS20 PRIMARY | Umpco, Inc. Dba Umpco Inc (USA) |
| Reference | Meaning |
|---|---|
| 11437SS20PB | 3/2 Design control — primary reference U.S. Government activity |
| 9M983C20 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| JM44LC90SS20PB | 5/9 Secondary reference J & M Products, Inc |
| JM44LC90SS20PS | C/1 Advisory reference — outside the item-of-supply concept J & M Products, Inc |
NSN 5340-01-349-4986 is a Clamp,loop, manufactured by Umpco, Inc. Dba Umpco Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-349-4986 has 1 manufacturer part number on file: S656SS20 (Umpco, Inc. Dba Umpco Inc).
Key specifications for S656SS20: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE BAND; Style Designator: SINGLE LOOP; Material Document and Classification: MIL-S-5059 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6721 MIL SPEC 2ND MATERIAL RESPONSE BAND; Diameter: 0.204 INCHES NOMINAL IN. 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.