The Piston Assembly,hydraulic Brake,, cataloged under National Stock Number 1630-00-679-2558, is classified within Federal Supply Class 1630 (Aircraft Wheel and Brake Systems) of the Aircraft Components and Accessories group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1630-00-679-2558 |
| Item Name | Piston Assembly,hydraulic Brake, |
| FSC / FSG | 1630 / 16 — Aircraft Wheel and Brake Systems |
| Status | ACTIVE |
| General Characteristics Item Description | HYDRAULIC FLUID PER MIL-H-5606; AMBIENT TEMPERATURE RANGE -0.65F TO 160.0F; PISTON TRAVEL 0.23 INCHES TO 0.26 INCHES; PORT SIZES 3/4-16 NF-3 FOR 1/2 INCH TUBE PER AND10050 IN |
| Criticality Code Justification | TEXT |
| Reference Data and Literature | 4BA4-28-3 |
| Pressure Rating | ERR-060 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Reference | Meaning |
|---|---|
| 313905 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1630-00-679-2558 is a Piston Assembly,hydraulic Brake,, classified under FSC 1630, Aircraft Wheel and Brake Systems. Status: active.
Key specifications for 1630-00-679-2558: General Characteristics Item Description: HYDRAULIC FLUID PER MIL-H-5606; AMBIENT TEMPERATURE RANGE -0.65F TO 160.0F; PISTON TRAVEL 0.23 INCHES TO 0.26 INCHES; PORT SIZES 3/4-16 NF-3 FOR 1/2 INCH TUBE PER AND10050 IN; Criticality Code Justification: TEXT; Reference Data and Literature: 4BA4-28-3; Pressure Rating: ERR-060. 4 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.
NSN 1630-00-679-2558 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.