Here is a concise summary of the bearings’ specifications:

1. 1″ Nylon Bearing: Maximum capacity of 75 lbs, intended for center support.
2. 1″ Steel Bearing: Rated for a 400 lbs load at 35,000 cycles, suitable for 12′ tall doors.
3. 1″ Football Retainer and Bearing: Also rated for a 400 lbs load at 35,000 cycles for 12′ tall doors.
4. 1″ 900 Lbs. Heavy Duty High-Cycle Bearing: Can support 900 lbs, with 1800 lbs capacity per pair. Set in cast steel housing with grease zert and shaft spacer.
5. 1-1/4″ Steel Bearing: Has a 400 lbs weight capacity and is made with 13 gauge steel.
6. 1-1/4″ Football Retainer and Steel Bearing: Supports a weight capacity of 400 lbs.
7. 1″ Rectangle Bolt-On Bearing: Also supports a 400 lbs weight capacity.

These bearings are designed for various load capacities and door sizes, each with specific features for optimal performance in garage door systems.