The Turnbuckle, cataloged under National Stock Number 5340-01-121-1961, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-121-1961 |
| Primary Part Number | 2999T56 |
| Item Name | Turnbuckle |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Take-Up Distance | 12.000 INCHES NOMINAL IN |
| Eye Width | 1.000 INCHES MINIMUM IN |
| Surface Treatment Document and Classification | ASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | ROUND OPEN BODY |
| End Style | CLOSED EYE AND CLOSED EYE |
| Surface Treatment | ZINC OVERALL |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 2999T56 | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| FF-T-791 | 4/1 Identification reference U.S. Government activity |
NSN 5340-01-121-1961 is a Turnbuckle, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-121-1961 has 1 manufacturer part number on file: 2999T56 (Mcmaster-Carr Supply Co).
Key specifications for 2999T56: Take-Up Distance: 12.000 INCHES NOMINAL IN; Eye Width: 1.000 INCHES MINIMUM IN; Surface Treatment Document and Classification: ASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Body Style: ROUND OPEN BODY. 7 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.