The Turnbuckle, cataloged under National Stock Number 5340-01-121-2957, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is The Crosby Group Llc Dba the Crosby Group. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5340-01-121-2957 |
| Primary Part Number | G-228-1X12 |
| Item Name | Turnbuckle |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | The Crosby Group Llc Dba the Crosby Group |
| Status | ACTIVE |
| Take-Up Distance | 12.000 INCHES NOMINAL IN |
| Length | 26.625 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | ROUND OPEN BODY |
| End Style | CLEVIS AND CLEVIS |
| Nominal Thread Size | 1.000 INCHES BODY IN |
| Nondefinitive Spec/std Data | 1 TYPE AND 1 FORM AND 7 CLASS |
| Fork Width | 1.750 INCHES NOMINAL IN |
| Surface Treatment | ZINC OVERALL |
| Pinhole Diameter | 1.000 INCHES NOMINAL IN |
| Thread Class | 2B BODY |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) 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 |
|---|---|
| G-228-1X12 PRIMARY | The Crosby Group Llc Dba the Crosby Group (USA) |
| Reference | Meaning |
|---|---|
| 2350-6165-001 | C/1 Advisory reference — outside the item-of-supply concept Antenna Products Corporation Dba Antenna Products Corp |
| FF-T-791 | 4/1 Identification reference U.S. Government activity |
NSN 5340-01-121-2957 is a Turnbuckle, manufactured by The Crosby Group Llc Dba the Crosby Group, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-121-2957 has 1 manufacturer part number on file: G-228-1X12 (The Crosby Group Llc Dba the Crosby Group).
Key specifications for G-228-1X12: Take-Up Distance: 12.000 INCHES NOMINAL IN; Length: 26.625 INCHES NOMINAL IN; Surface Treatment Document and Classification: ASTM A153 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Body Style: ROUND OPEN BODY. 13 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.