Note: Measure at least six to ten links minimize errors. A tape measure can be used if a vernier is not available. Because tape measures are less accurate, the measured length should be as long as possible.
Table 9-1: Maximum Allowable Chain Elongation No. of Teeth of Driving Sprocket
Chain Elongation (%)
60 or less 61 ~ 80 81 ~ 100
1.5 1.2 1.0 0.8
100 or more
Table 9-2: Standard Length and 1.5% Elongation
mm (in.)
No. of Links
Length
RS25 RS35 RS41 RS40 RS50 RS60 RS80 38.10 57.15 76.20 76.20 95.25 114.30 152.40 (1.50) (2.25) (3.00) (3.00) (3.75) (4.50) (6.00) 38.67 58.01 77.34 77.34 96.68 116.01 154.69 (1.52) (2.28) (3.05) (3.05) (3.81) (4.57) (6.09) 63.50 95.25 127.00 127.00 158.75 190.50 254.00 (2.50) (3.75) (5.00) (5.00) (6.25) (7.50) (10.00) 64.45 96.68 128.91 128.91 161.13 193.36 257.81 (2.54) (3.81) (5.08) (5.08) (6.34) (7.61) (10.15) RS100 RS120 RS140 RS160 RS180 RS200 RS240 190.50 228.60 266.70 304.80 342.90 381.00 457.20 (7.50) (9.00) (10.50) (12.00) (13.50) (15.00) (18.00) 193.36 232.03 270.70 309.37 348.04 386.72 464.06 (7.61) (9.14) (10.66) (12.18) (13.70) (15.23) (18.27) 317.50 381.00 444.50 508.00 571.50 635.00 762.00 (12.50) (15.00) (17.50) (20.00) (22.50) (25.00) (30.00) 322.26 386.72 451.17 515.62 580.07 644.53 773.43 (12.69) (15.23) (17.76) (20.30) (22.84) (25.38) (30.45)
Standard
6
1.5% Elongation
Standard
10
1.5% Elongation
No. of Links
Length
Standard
6
1.5% Elongation
Standard
10
1.5% Elongation
Checking Chain Accessories Check for damage to any metal fittings and make sure fittings are as secure as possible. Loose-fitting attachments may reduce the life of the chain. Generally, a tolerance up to H8 or H9 is permitted for the pin hole diameter.
18 I NSTALLATION & M AINTENANCE
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