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The type of belt recommended for the more severe oil or heat application is traditionally described as O&HR (Oil and Heat Resistant). The meaning of this term is somewhat obscure, although it is defined by RMA (Rubber Manufacturers Association) bulletins. It combines two belt characteristics into one term when they should be described separately.

The new BELT standard requires much higher flame resistance than the current MSHA standard (30 CFR part 18 belts. • RMA or another governing body might include the old fire resistance standard (30 CFR Part 18) as a requirement for flame resistance for above ground applications as well as non coal mines. Updates to

V-Belt Standards ; ANSI/RMA IP-21. Double V-belts. ; ANSI/RMA IP-22. Narrow V-belts. ; ANSI/RMA IP-23. Light Duty V-belts. ; CSN 02 3110. Endless 

Standard and/or project Stage TC; ISO 22:1975. Flat transmission belts and corresponding pulleys — Widths. 95.99: ISO/TC 41: Belt drives — V-ribbed belts, joined V-belts and V-belts including wide section belts and hexagonal belts — Electrical conductivity of antistatic belts: Characteristics and methods of test

Classical V-Belt Standard Datum Length for design per. ANSI/RMA IP-20 Table Related Resources: belt design V-Belt Standard Datum Length per. ANSI/RMA IP-20 Table Belt Drive Design and Engineering Mechanical Gear Design and Engineering

RMA MO-1 Classes and Tolerances for Products Molded in Solid Rubber RMA MO-1 provides the necessary information to designate a dimensional tolerances, finish tolerances, and flash tolerances for molded rubber parts. The RMA designation is specified as follows: RMA A2 - F3 - T.003 Specification RMA A2 - F3 - T.003

The belt have high resistance to penetration damage. Optimum adhesion between plies and rubber gives the belt better performance and longer working life. Each 

power density of any V-belt and half the stretch of standard Gates NOTE: RMA Super HC™ moulded notch (3VX, 5VX & 8VX) are rated from. -57ºC to +121ºC.

The RMA bulletin applies to new, clean belts. However, older belts can collect debris or become worn and V-belt drives at lower temperatures are stiffer; therefore start-up torque requirements and potential belt degradation will be greater than at normal they

Table 12. Summary of RMA Drawing Designations Extruded Rubber Products. Table 13. Standard Cross-Sectional Tolerance. Table 16. Cut Length tolerance for unspliced extrusion. Drawing Designation. Table 18. Spliced Length Tolerances.