The Bellows,pressure, cataloged under National Stock Number 3010-01-256-4359, is classified within Federal Supply Class 3010 (Torque Converters and Speed Changers) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Senior Operations Llc Dba Metal Bellows Div Metal Bellows. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3010-01-256-4359 |
| Primary Part Number | 21290 |
| Item Name | Bellows,pressure |
| FSC / FSG | 3010 / 30 — Torque Converters and Speed Changers |
| Manufacturer | Senior Operations Llc Dba Metal Bellows Div Metal Bellows |
| Status | ACTIVE |
| 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 |
|---|---|
| 21290 PRIMARY | Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA) |
| Reference | Meaning |
|---|---|
| 965373-1 | 7/2 Vendor item drawing reference U.S. Government activity |
| A21290 | 5/9 Secondary reference Senior Operations Llc Dba Metal Bellows Div Metal Bellows |
NSN 3010-01-256-4359 is a Bellows,pressure, manufactured by Senior Operations Llc Dba Metal Bellows Div Metal Bellows, classified under FSC 3010, Torque Converters and Speed Changers. Status: active.
NSN 3010-01-256-4359 has 1 manufacturer part number on file: 21290 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-300-0217. Verify interchangeability with system specifications before substitution.
Key specifications for 21290: Special Features: MATL STAINLESS STEEL;NUMBER OF CONVOLUTIONS 10; BELLOWS SHALL BE BACKFILLED WITH HELIUM AT 1 ATMOSPHERE PRESSURE AT NORMAL FREE LENGTH AT 70 DEG F;TEMPERATURE RANGE,OPERABLE FROM M80 DEG F TO 200 DEG F;OVERALL LENGTH WHEN EXPANDED BY 0.56 CC FROM NTP FREE LENGTH SHALL NOT EXCEED 0.360 IN; IF EXTENDED BEYOND 0.400 IN. HEIGHT,ITEM NO LONGE USEABLE IN; End Item Identification: NSN 6605011184497. 0 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.