The constant contact side bearing can support no more than 85% of the body weight. The maximum side bearing preload that can be utilized for a given car design is calculated by dividing the car body weight by four and multiplying by 85% (AAR Specification M-948-06). The body weight equates to the light weight minus truck weight.

Long Travel

The TCC-IV long travel constant contact side bearings feature a more durable, heat-resistant design to maximize the life of your side bearings under the most demanding high-speed, high-mileage applications.

Housing vents and insulator provide superior heat dispersion increasing the life of the side bearing.
Anti-rotational lugs improve rotational resistance and maximize energy absorption, resulting in higher hunting thresholds.
Patented TecsPak springs provide excellent vertical energy absorption for car body roll control.
Simple 3-piece design makes these side bearings easy to install and maintain.
Color coded insulators for quick identification.
5/8" travel from 5-1/16" set-up height.
TCC-IV side bearings allow railcars to run at higher speeds with reduced truck and wheel wear.

Constant Contact Side Bearing	Typical Car Applications	Preload	Insulator ID Color
TCC-IV-30 LT	Light Spine Cars	3,000 lbs.	green
TCC-IV-45 LT	Aluminum Open Top Hoppers Aluminum Gondolas Articulated Double Stack - Articulated Connection Spine Cars	4,500 lbs.	red
TCC-IV-60 LT	Aluminum Covered Hoppers Aluminum Open Top Hoppers General Purpose 89' Flat Cars Centerbeam Cars Gondolas / Coil Cars All Tank Cars Stand Alone Well Cars Drawbar Connected Well Articulated Double Stack - End Connection	6,000 lbs.	blue
TCC-IV-80 LT	Steel Covered Hoppers Steel Open Top Coal Cars All Box Cars Bulkhead Flat Cars Autorack Cars	8,000 lbs.	grey