U.S. Tsubaki RS25 bushed chain is the smallest ANSI roller chain. It is ideal for power transmission in business machines, electro-optical equipment, and precision and general industrial machines where relatively large space is allowed for miniature drives.
These chains can accommodate a large allowable load and are widely used for driving motorcycle cam shafts and power transmission machinery in general.
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Unit of Measure
Items
RS25 through RS240 Chains

RS25 Roller Chains
RS25 through RS240 Chains

RS25 Roller Chains
RS25.BF25H Chains

RS25.BF25H Chains
Chain Type  N/A Rollerless N/A Rollerless N/A
ANSI No. N/A 25 N/A 25 N/A
P - Pitch N/A 0.250 in
B - Bushing Diameter N/A 0.130 in
W - Width Between Roller Link Plates N/A 0.125 in
T N/A 0.030 in N/A 0.030 in N/A 0.039 in
t N/A 0.030 in
H N/A 0.230 in
h N/A 0.199 in N/A 0.199 in N/A 0.230 in
D N/A 0.090 in
Number of Strands N/A 1 N/A 2 N/A 1
L1+L2 N/A 0.339 in N/A 0.591 in N/A 0.362 in
L1 N/A 0.150 in N/A 0.276 in N/A 0.161 in
L2 N/A 0.189 in N/A 0.315 in N/A 0.201 in
C - Transverse Pitch N/A 0.252 in N/A 0.252 in N/A
Standard Type of Pin N/A Riveted
Min. Ultimate Strength ANSI Standard N/A 780 lb N/A 1560 lb N/A
Average Tensile Strength N/A 1050 lb N/A 2100 lb N/A 1320 lb
Number of Links per 10 ft N/A 480
Maximum Allowable Load N/A 140 lb N/A 240 lb N/A 170 lb