Tsubaki ATRA-FLEX M4 Coupling Components — 12-Piece Lot
Summary
For sale is a 12-piece lot of Tsubaki ATRA-FLEX M4 flexible coupling components, including M4 hubs, orange high-torque inserts, and standard rings. These are unused surplus components in original Tsubaki ATRA-FLEX packaging, with 2024 PO/date-coded packaging visible on the cartons. This is a strong parts lot for maintenance teams, rebuild shops, or industrial buyers already using Tsubaki ATRA-FLEX M-Series coupling hardware.
| Manufacturer | Part Number | Qty | Description | Year / Date Detail | Other Important Details |
| Tsubaki | M4HUBRSB / M4HUB50MM | 4 | M4 coupling hub, 50 mm hub noted | 2024 PO | Visible hub marked TSUBAKI M4HUB50MM; ATRA-FLEX M-Series component |
| Tsubaki | M4INSERT / M4INSERTORANGE | 4 | M4 orange high-torque elastomer insert | 2024 PO; visible labels show 2/15/24 | Packaging marked INSERT - ORANGE HIGH TORQUE and Made in USA |
| Tsubaki | M4RING | 4 | M4 standard coupling ring | 2024 PO | Packaging marked RING - STANDARD and Made in USA |
These parts are from Tsubaki’s ATRA-FLEX M-Series / Millennium flexible coupling product family. ATRA-FLEX M-Series components are commonly used in industrial power transmission applications where a flexible coupling is needed between rotating shafts, such as motor-driven equipment, pumps, fans, blowers, conveyors, and similar machinery. Tsubaki describes the M-Series coupling arrangement as using two hubs with an insert and ring, so this lot appears to include enough hubs for two hub-pair assemblies plus additional matching inserts and rings for spare or replacement use. Buyer should verify shaft size, M4 series fitment, and component compatibility before purchase