The Nut,coupling,flexible Casing, cataloged under National Stock Number 3040-00-855-2020, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Hersh Packing & Rubber Co. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 3040-00-855-2020 |
| Primary Part Number | 61P-4 |
| Item Name | Nut,coupling,flexible Casing |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Hersh Packing & Rubber Co |
| Status | ACTIVE |
| Thread Length | 0.250 INCHES NOMINAL IN |
| Outside Diameter | 0.438 INCHES NOMINAL IN |
| Seat End Inside Diameter | 0.257 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Thread Size | 3/8 IN.-24 IN |
| Screw Thread Series Designator | UNF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 61P-4 | Hersh Packing & Rubber Co (USA) |
| Reference | Meaning |
|---|---|
| 261P | 5/9 Secondary reference Imperial |
| 261P04 | 3/9 Design control — primary reference Imperial |
NSN 3040-00-855-2020 is a Nut,coupling,flexible Casing, manufactured by Hersh Packing & Rubber Co, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-855-2020 has 1 manufacturer part number on file: 61P-4 (Hersh Packing & Rubber Co).
Key specifications for 61P-4: Thread Length: 0.250 INCHES NOMINAL IN; Overall Length: 0.375 INCHES NOMINAL IN; Outside Diameter: 0.438 INCHES NOMINAL IN; Seat End Inside Diameter: 0.257 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.