The Diaphragm,chamber,brake, cataloged under National Stock Number 2530-00-331-8123, is classified within Federal Supply Class 2530 (Vehicular Brake, Steering, Axle, Wheel, and Track Components) of the Vehicular Equipment Components group. The manufacturer of record is Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 2530-00-331-8123 |
| Primary Part Number | 231506 |
| Item Name | Diaphragm,chamber,brake |
| FSC / FSG | 2530 / 25 — Vehicular Brake, Steering, Axle, Wheel, and Track Components |
| Manufacturer | Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems |
| Status | ACTIVE |
| FSC Application Data | REAR BRAKE CHAMBER ASSY,FIRE TRUCK |
| Diaphragm Type | BEADED TAPERED SLEEVE |
| Sleeve Smallest Outside Diameter | 3.422 INCHES NOMINAL IN |
| Mounting Method | BEAD |
| Overall Outside Diameter | 4.844 INCHES NOMINAL IN |
| Material Thickness | 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM IN |
| Construction | FABRIC INSERT |
| Material | RUBBER |
| Nonmetallic Hardness Rating | 45.000 MINIMUM SHORE DUROMETER A AND 55.000 MAXIMUM SHORE DUROMETER A |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 684123 | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| 231506 PRIMARY | Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems (USA) |
| Reference | Meaning |
|---|---|
| 806737 | 5/9 Secondary reference Terex American Crane Corp |
| 440349 | 5/9 Secondary reference American Hoist and Derrick Co |
| 180881 | 5/9 Secondary reference U.S. Government activity |
| 684123 | 5/9 Secondary reference Hercules Engine Co Inc |
| 806737 | 5/9 Secondary reference American Hoist and Derrick Co |
| 440349 | 5/9 Secondary reference Terex American Crane Corp |
NSN 2530-00-331-8123 is a Diaphragm,chamber,brake, manufactured by Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems, classified under FSC 2530, Vehicular Brake, Steering, Axle, Wheel, and Track Components. Status: active.
NSN 2530-00-331-8123 has 2 manufacturer part numbers on file: 684123 (Brinkley Technology Group Llc Dba Hercules Manufacturing), 231506 (Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems).
4 possible matches (shared part number, not a government interchangeability claim): 4720-00-477-5671, 5975-01-294-9684, 5920-01-381-7691. Verify interchangeability with system specifications before substitution.
Key specifications for 231506: Overall Height: 2.657 INCHES MINIMUM AND 2.719 INCHES MAXIMUM IN; FSC Application Data: REAR BRAKE CHAMBER ASSY,FIRE TRUCK; Diaphragm Type: BEADED TAPERED SLEEVE; Sleeve Smallest Outside Diameter: 3.422 INCHES NOMINAL IN. 9 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.