Modified Stock Gearing - Boston Gear

Roller Chains
ANSI Standard
Double, Triple and Quadruple Widths Dimensions
ALL DIMENSIONS IN INCHES
H
Pin
Average Avg.
Chain
Roller
Ultimate Weight
Number Pitch E A B C T F Diam.
Diam.
G
Strength Per Ft.
Lbs. Lbs.
G
C
B T
G
C
B
G
C
B
G
C
B
G
H
PITCH
H
PITCH
H
PITCH
H
PITCH
E A
F
E
A
T
F
E
A
T
F
E
T
A
F
SINGLE WIDTH
25* 1/4 .125 .130 .31 .19 .15 .030 .23 .0905 930 .104
35* 3/8 .187 .200 .47 .34 .23 .050 .36 .141 2,300 .21
40 1/2 .312 .312 .65 .42 .32 .060 .46 .156 3,700 .41
S41 1/2 .250 .306 .51 .37 .26 .050 .39 .141 2,580 .28
50 5/8 .375 .400 .79 .56 .40 .080 .59 .200 6,400 .69
60 3/4 .500 .468 .98 .64 .49 .094 .70 .234 8,700 .96
80 1 .625 .625 1.28 .74 .64 .125 .93 .312 15,500 1.60
100 101/4 .750 .750 1.54 .91 .77 .156 1.16 .375 24,000 2.56
120 1-1/2 1.000 .875 1.94 1.14 .97 .187 1.38 .437 34,000 3.60
140 1-3/4 1.000 1.000 2.08 1.22 1.04 .218 1.63 .500 46,000 4.90
160 2 1.250 1.125 2.48 1.46 1.24 .250 1.88 .562 58,000 6.40
180 2-1/4 1.406 1.406 2.81 1.74 1.40 .281 2.13 .687 80,000 8.70
200 2-1/2 1.500 1.562 3.02 1.86 1.51 .312 2.32 .781 95,000 10.30
240 3 1.875 1.875 3.76 2.27 1.88 .375 2.80 .937 130,000 16.90
DOUBLE WIDTH
25-2* 1/4 .125 .130 .56 .31 .28 .030 .23 .0905 1,860 .20
35-2* 3/8 .187 .200 .86 .50 .43 .050 .36 .141 4,600 .41
40-2 1/2 .312 .312 1.20 .67 .60 .060 .46 .156 7,400 .81
50-2 5/8 .375 .400 1.49 .82 .75 .080 .59 .200 12,800 1.35
60-2 3/4 .500 .468 1.87 1..02 .93 .094 .70 .234 17,400 1.90
80-2 1 .625 .625 2.42 1.32 1.21 .125 .93 .312 31,000 3.15
100-2 1-1/4 .750 .750 2.94 1.62 1.47 .156 1.16 .375 48,000 5.00
120-2 1-1/2 1.000 .875 3.72 2.04 1.86 .187 1.38 .437 68,000 7.10
140-2 1-3/4 1.000 1.000 4.00 2.19 2.00 .218 1.63 .500 92,000 9.50
160-2 2 1.250 1.125 4.80 2.63 2.40 .250 1.88 .562 116,000 17.60
180-2 2-1/4 1.406 1.406 5.40 2.94 2.70 .281 2.13 .687 160,000 17.60
200-2 2-1/2 1.500 1.562 5.86 3.28 2.93 .312 2.32 .781 190,000 21.00
240-2 3 1.875 1.875 7.22 4.00 3.61 .375 2.80 .937 260,000 33.10
TRIPLE WIDTH
25-3* 1/4 .125 .130 .81 .44 .41 .030 .23 .0905 2,790 .30
35-3* 3/8 .187 .200 1.26 .70 .63 .050 .36 .141 6,900 .60
40-3 1/2 .312 .312 1.78 .96 .89 .060 .46 .156 11,100 1.20
50-3 5/8 .375 .400 2.20 1.17 1.10 .080 .59 .200 19,200 2.05
60-3 3/4 .500 .468 2.75 1.46 1.37 .094 .70 .234 26,100 2.75
80-3 1 .625 .625 3.58 1.90 1.79 .125 .93 .312 46,500 4.80
100-3 1-1/4 .750 .750 4.35 2.33 2.18 .156 1.16 .375 72,000 7.30
120-3 1-1/2 1.000 .875 5.52 2.94 2.76 .187 1.38 .437 102,000 10.70
140-3 1-3/4 1.000 1.000 5.94 3.16 2.97 .218 1.63 .500 138,000 15.00
160-3 2 1.250 1.125 7.10 3.78 3.55 .250 1.88 .562 174,000 19.40
180-3 2-1/4 1.406 1.406 8.00 4.22 4.00 .281 2.13 .687 240,000 26.50
200-3 2-1/2 1.500 1.562 8.68 4.70 4.34 .312 2.32 .781 285,000 31.00
240-3 3 1.875 1.875 10.70 5.74 5.35 .375 2.80 .937 390,000 49.20
QUADRUPLE WIDTH
25-4* 1/4 .125 .130 1.06 .56 .53 .030 .23 .0905 3,720 .45
35-4* 3/8 .187 .200 1.65 .90 .83 .050 .36 .141 9,200 .82
40-4 1/2 .312 .312 2.33 1.24 1.17 .060 .46 .156 14,800 1.60
50-4 5/8 .375 .400 2.91 1.53 1.45 .080 .59 .200 25,600 2.75
60-4 3/4 .500 .468 3.64 1.90 1.82 .094 .70 .234 34,800 3.70
80-4 1 .625 .625 4.73 2.47 2.37 .125 .93 .312 62,000 6.40
100-4 1-1/4 .750 .750 5.76 3.03 2.88 .156 1.16 .375 96,000 9.80
120-4 1-1/2 1.000 .875 7.30 3.83 3.65 .187 1.38 .437 136,000 14.20
140-4 1-4/4 1.000 1.000 7.86 4.12 3.93 .218 1.63 .500 184,000 20.00
160-4 2 1.250 1.125 9.40 4.93 4.70 .250 1.88 .562 232,000 25.00
180-4 2-1/4 1.406 1.406 10.58 5.52 5.29 .281 2.13 .687 320,000 35.00
200-4 2-1/2 1.500 1.562 11.50 6.10 5.75 .312 2.32 .781 380,000 41.50
240-4 3 1.875 1.875 14.14 7.47 7.07 .375 2.80 .937 520,000 65.00
*Non-Roller
244 Boston Gear 800-825-6544 P-1930-BG 04/10