The Hub,body, cataloged under National Stock Number 3040-00-256-6744, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Bair R H Machine Co. Government technical data includes 2 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-00-256-6744 |
| Primary Part Number | SS-522-4491153PC77-1.5IN |
| Item Name | Hub,body |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Bair R H Machine Co |
| Status | ACTIVE |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE |
| Shoulder Outside Diameter | 2.125 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| SS-522-4491153PC77-1.5IN | Bair R H Machine Co (USA) |
| SS-522-4491153PC77-1.5IN | Alek Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| SS-522-4491153PC77-1.5IN | 3/9 Design control — primary reference Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
| 4491153-L-77-1. | C/1 Advisory reference — outside the item-of-supply concept Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
| SS-522-4491153 | D/9 Drawing number reference only Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
| 4491153PC77 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 4491153-L-77 | C/1 Advisory reference — outside the item-of-supply concept Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
NSN 3040-00-256-6744 is a Hub,body, manufactured by Bair R H Machine Co, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-256-6744 has 2 manufacturer part numbers on file: SS-522-4491153PC77-1.5IN (Bair R H Machine Co), SS-522-4491153PC77-1.5IN (Alek Industries Inc).
3 possible matches (shared part number, not a government interchangeability claim): 3110-01-131-7629, 5340-01-159-5759, 3040-01-224-3150. Verify interchangeability with system specifications before substitution.
Key specifications for SS-522-4491153PC77-1.5IN: Special Features: O/A LENGTH:1.500 IN.NOM IN; Material: PLASTIC POLYTETRAFLUOROETHYLENE; Shoulder Outside Diameter: 2.125 INCHES NOMINAL IN. 2 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.
NSN 3040-00-256-6744 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.