The Yoke Assembly,clutch Adjusting, cataloged under National Stock Number 3810-00-374-1879, is classified within Federal Supply Class 3810 (Cranes and Crane-shovels) of the Construction, Mining, Excavating Equipment group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3810-00-374-1879 |
| Primary Part Number | A4 |
| Item Name | Yoke Assembly,clutch Adjusting |
| FSC / FSG | 3810 / 38 — Cranes and Crane-shovels |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL; 2.250 IN. LARGEST OD; 2.250 IN. H; BORE DIA THD INTERNAL; 3.500-16UN-2B; RH; 1.000 IN. LG OF THDS; 4 ATTACHING ARM ON BODY; 90 DEG APART;2.250 IN. LG; EACH ARM HAS UNTHD MTG HOLE 0.250 IN. DIA; EACH ARM WHEN PARALLEL W/BORE WILL PIVOT 90 DEG ANGLE TO BORE; EXTENDED LG OF EACH ARM IS 2.375 IN. IN |
| 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 |
|---|---|
| A4 PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| 23377 PRIMARY | Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp. (USA) |
| 14162A4 PRIMARY | Komatsu America Corporation (USA) |
| Reference | Meaning |
|---|---|
| 56970D | 5/9 Secondary reference U.S. Government activity |
| R14162A4 | 5/9 Secondary reference Komatsu America Corporation |
NSN 3810-00-374-1879 is a Yoke Assembly,clutch Adjusting, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 3810, Cranes and Crane-shovels. Status: active.
NSN 3810-00-374-1879 has 3 manufacturer part numbers on file: A4 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic), 23377 (Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.), 14162A4 (Komatsu America Corporation).
5 possible matches (shared part number, not a government interchangeability claim): 6610-00-621-2387, 5950-00-645-1411, 6145-00-689-7454. Verify interchangeability with system specifications before substitution.
Key specifications for A4: General Characteristics Item Description: STEEL; 2.250 IN. LARGEST OD; 2.250 IN. H; BORE DIA THD INTERNAL; 3.500-16UN-2B; RH; 1.000 IN. LG OF THDS; 4 ATTACHING ARM ON BODY; 90 DEG APART;2.250 IN. LG; EACH ARM HAS UNTHD MTG HOLE 0.250 IN. DIA; EACH ARM WHEN PARALLEL W/BORE WILL PIVOT 90 DEG ANGLE TO BORE; EXTENDED LG OF EACH ARM IS 2.375 IN. IN. 1 specification is 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.