4. Top Chains
Sprockets Use special sprockets. For TOS Chain (S-rollers), use 31 teeth (effective teeth: 10 1/3, P.D. 254.59 mm), for TOR Chain (R-rollers), use 11 teeth (P.D. 270.47 mm). Selection and Handling (1) Guiding at the curve: With R-rollers, you can guide the chain with sprockets or guide rails. With S-rollers, you can guide with sprockets, but not with guide rails. (2) TO Chain is available with nickel plating or all 304 stainless steel. Contact the manufacturer for information. Chains for Special Applications (1) TO Top Chains with engineered plastic top plates, plates with bushings, and rollers are available for low-noise, light-weight applications (width: 114.3 mm). Check with the manufacturer. (2) TU series is designed to operate in any of three directions. (See Figure 4.13.)
Figure 4.13 TU Crescent Top Chain Can Operate in Three Directions
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