The Diaphragm,actuator Valve,special, cataloged under National Stock Number 2915-01-034-8289, is classified within Federal Supply Class 2915 (Engine Fuel System Components, Aircraft and Missile Prime Movers) of the Engine Accessories group. The manufacturer of record is Bellofram Corp Diaphragm Div. Government technical data includes 11 specifications, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2915-01-034-8289 |
| Primary Part Number | B8658 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 2915 / 29 — Engine Fuel System Components, Aircraft and Missile Prime Movers |
| Manufacturer | Bellofram Corp Diaphragm Div |
| Status | ACTIVE |
| Bead Diameter | 1.655 INCHES NOMINAL IN |
| Outside Diameter | 2.740 INCHES NOMINAL IN |
| Style Designator | SPECIAL SHAPED |
| Material Thickness | 0.017 INCHES NOMINAL IN |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 2.380 INCHES NOMINAL IN |
| Center Hole Diameter | 0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| Media for Which Designed | GAS |
| Outside Corner Radius | 0.180 INCHES NOMINAL IN |
| Material | RUBBER SILICONE |
| Hole Diameter | 0.234 INCHES NOMINAL 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 |
|---|---|
| B8658 PRIMARY | Bellofram Corp Diaphragm Div (USA) |
| B8658 | Bellofram Corporation (USA) |
| 6874725 | Rolls-Royce Corporation (USA) |
| Reference | Meaning |
|---|---|
| 6874725 | 5/9 Secondary reference Boeing Distribution, Inc. |
| 6874725 | 5/9 Secondary reference Allison Transmission Inc Dba Allison Transmission, Inc |
NSN 2915-01-034-8289 is a Diaphragm,actuator Valve,special, manufactured by Bellofram Corp Diaphragm Div, classified under FSC 2915, Engine Fuel System Components, Aircraft and Missile Prime Movers. Status: active.
NSN 2915-01-034-8289 has 3 manufacturer part numbers on file: B8658 (Bellofram Corp Diaphragm Div), B8658 (Bellofram Corporation), 6874725 (Rolls-Royce Corporation).
Key specifications for B8658: Overall Height: 0.750 INCHES NOMINAL IN; Bead Diameter: 1.655 INCHES NOMINAL IN; Outside Diameter: 2.740 INCHES NOMINAL IN; Style Designator: SPECIAL SHAPED. 11 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.