4800/4900/6900 Frame Rails
WSTframe rails are designed to maintain a constant outsidedimension of 34” with the exception of the 548 outer reinforcement. Mod 546
WSTMain frame rails are offered in two configurations Singlechannel and Double Channel.
Single Channel rail is made up of a single main frame railcomponent which can be combined with a 547 partial liner to add strength only where needed and reduce overall weight.
Double channel rails are also available which provide end to end fulllength double channel rails for maximum strength and durability.
Double channels can also be combined with 547 partial liners and 548 outer liners to meet the needs of severe loading conditions. Mod 547
Partial Inner frame reinforcements (See Next Pages) Mod 548
Mod 547 Partial Frame Rails
Partial Inner frame reinforcements are used in conjunction with module 546SC and DC main frame rails.
Where weight is an issue WST’s partial liner options can help reduce overallweight and achievethe RBM strength only where needed.
1/4” liner material is sized to fit inside all main rail stock with the exception of3/8 x 3 7/8” x 11 5/8” frame rail.
3/8” liners are made from 3/8” x 3 ½” x 10 ¾” main rail stock and is onlycompatible with 3/8” x 3 7/8” x 11 5/8” frame rail.
Mod 548 Outer Reinforcements
Outer frame reinforcements are used in conjunction with module 546 mainframe rails and module 547 partial reinforcements
Outer frame reinforcements do not affect the cross member width sizes butcan affect suspension, fifth wheel components and any components where overall width may be critical such as fuel tank steps.
Outer reinforcements can be made in 1/4” or 3/8” material.
Special consideration should be given to outer liner locations to ensure framecomponentsmounted on the outside of rail are compatible with the extra rail thickness resulting from this option.
Outer reinforcement options can be used to strengthen the BOC area or incases that body builders need to weld to the top flange and web without effecting main frame rail strength.
Please contact WSTif you have special mounting requirements that can makeuse of the outer reinforcement application and a factory direct solution can be developed to meet your needs.
Outer reinforcement end locations that go to end of frame stop 21” short ofEOF for all taper applications.