The Turnbuckle Body, cataloged under National Stock Number 5340-00-128-1789, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Sterling Machine Company, Inc.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5340-00-128-1789 |
| Primary Part Number | 4020T51P04 |
| Item Name | Turnbuckle Body |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Sterling Machine Company, Inc. |
| Status | ACTIVE |
| Body Style | HEX CLOSED BODY |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 0.190 INCHES BODY IN |
| Body Length | 2.350 INCHES MINIMUM AND 2.390 INCHES MAXIMUM IN |
| Thread Class | 3B BODY |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) BODY |
| 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 |
|---|---|
| 4020T51P04 | Sterling Machine Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 4020T51P04 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-00-128-1789 is a Turnbuckle Body, manufactured by Sterling Machine Company, Inc., classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-128-1789 has 1 manufacturer part number on file: 4020T51P04 (Sterling Machine Company, Inc.).
Key specifications for 4020T51P04: Body Style: HEX CLOSED BODY; Material Document and Classification: AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Size: 0.190 INCHES BODY IN; Body Length: 2.350 INCHES MINIMUM AND 2.390 INCHES MAXIMUM IN. 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.