The Standoff,threaded,spacing, cataloged under National Stock Number 5340-01-645-5745, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 18 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-645-5745 |
| Primary Part Number | 12577991 |
| Item Name | Standoff,threaded,spacing |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flange Width Across Flats | 2.062 INCHES NOMINAL IN |
| Width Across Flats | 2.062 INCHES NOMINAL IN |
| Length | 1.374 INCHES NOMINAL IN |
| Flange Thickness | 2.500 INCHES NOMINAL IN |
| Thread Length | 0.625 INCHES NOMINAL RIGHT INTERNAL IN |
| Thread Length | 0.415 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN |
| Style Designator | FLANGED LEFT AND RIGHT INTERNAL THREADS |
| Thread Direction | RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Direction | RIGHT-HAND RIGHT INTERNAL |
| Nominal Thread Size | 0.375 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN |
| Nominal Thread Size | 0.500 INCHES RIGHT INTERNAL IN |
| Cross-Sectional Shape | HEXAGON |
| Surface Treatment | ZINC OVERALL |
| Thread Quantity Per Inch | 16 LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Quantity Per Inch | 20 RIGHT INTERNAL |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) LEFT INTERNAL (INCLUDES THRU THREAD) |
| Thread Series Designator | UNF RIGHT INTERNAL |
| 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 |
|---|---|
| 12577991 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 5340-01-645-5745 is a Standoff,threaded,spacing, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-645-5745 has 1 manufacturer part number on file: 12577991 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12577991: Flange Width Across Flats: 2.062 INCHES NOMINAL IN; Width Across Flats: 2.062 INCHES NOMINAL IN; Length: 1.374 INCHES NOMINAL IN; Flange Thickness: 2.500 INCHES NOMINAL IN. 18 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.