Silent Chain Couplings

Straight Type Coupling
Diagonal Type Coupling
A connected Coupling

There are two models of Ramsey silent chain couplings, the Straight Type and the Diagonal Type. Straight Type couplings are composed of coupling halves that are split perpendicular to the shaft axis. A hardened steel silent chain joins the two halves. Diagonal Type couplings are split at an angle to the shaft axis. Due to the angular split, the chain that wraps a Diagonal couplings is loaded in shear,as well as tension. This results in Diagonal couplings having a somewhat higher load capacity than straight couplings, where the chain is only loaded in shear.

Both Straight and Diagonal silent chain couplings have a torque capacity that is greater than the largest diameter mild steel shaft on which it is mounted. The choice between the the two types is often determined by ease of installation in a specific application.

Ramsey also produces a full line of SA chain couplings that are completely interchangeable with Morse SA silent chain couplings. For detailed SA chain coupling specifications, as well as pricing and availability, contact Ramsey.

Straight

Diagonal

Coupling
Number
Pitch &
# Teeth
Min
Plain
Bore
Max.
Bore*
A B C D E K Approx.
Weight
Straight Diagonal
3AA   3/8 - 16 7/16 7/8 2 1/4 1 7/16 2 3/16   1/16 1 9/16 1 1/8 lb.
3A 3AD 3/8 - 16 1/2 7/8 2 1/4 1 7/16 2 11/16 2 11/16 1/16 1 1/2 9/16 1 1/2
4A 4AD 1/2 - 16 3/4 1 1/4 3 1/16 1 7/8 3 3/16 3 11/16 1/8 2 3/4 4
4B 4BD 1/2 - 20 3/4 1 3/4 3 11/16 2 1/2 3 3/16 3 11/16 1/8 2 1 1/16 6 1/4
4C 4CD 1/2 - 24 1 2 1/4 4 3/8 3 1/8 3 3/16 3 11/16 1/8 2 1 3/8 10
  5BD 5/8 - 20 1 2 1/4 4 5/8 3 1/8   3 3/4 1/8 2 1 3/8 10
6B 6BD 3/4 - 20 1 1/4 2 5/8 5 9/16 3 3/4 4 1/2 4 15/16 1/8 3 1 5/8 20
6C 6CD 3/4 - 24 1 1/4 3 5/16 6 1/2 4 3/4 4 1/2 4 15/16 1/8 3 2 1/8 30
8B 8BD 1 - 20 1 1/2 3 3/8 7 3/8 5 5 7/8 5 7/8 3/16 4 2 5/32 40
8C 8CD 1 - 24 1 1/2 4 1/2 8 11/16 6 1/4 5 7/8 5 7/8 3/16 4 2 3/4 60
12A 12AD 1 1/2 - 16 1 3/4 3 3/4 9 1/8 5 5/8 8 1/8 8 1/8 1/4 6 2 5/16 95
12B 12BD 1 1/2 - 20 2 5 1/4   7 1/2 8 1/8 8 1/8 1/4 6 3 1/4 105

Horsepower Ratings

Coupling
No.
Revolutions per Minute
100 200 300 400 500 600 700 900 1200 1500 1800 2400 3600
3AA 1.6 2.2 2.8 3.2 3.6 4.0 4.2 4.8 5.5 6.2 6.6 8.0 9.2
3A 2.4 3.4 4.2 4.8 5.4 5.9 6.4 7.2 8.3 9.3 10 12 14
4A 6.0 8.5 11 12 13 14 16 18 21 23 25 29 36
4B 9.5 14 17 19 21 23 25 29 33 37 40 46 57
4C 13 18 22 26 29 32 34 39 45 50 55 64 78
6B 30 42 52 60 67 74 80 90 105 115 125 145 -
6C 44 62 76 88 98 110 115 130 150 170 185 215 -
8B 70 100 120 140 155 170 185 210 240 270 300 - -
8C 100 140 175 200 225 250 265 300 350 390 430 - -
12A 150 210 260 300 335 370 400 450 520 580 - - -
12B 240 335 410 475 530 580 630 715 825 - - - -
Coupling
    No.
Revolutions per Minute
100 200 300 400 500 600 700 900 1200 1500 1800 2400 3600
3AD 2.5 3.5 4.5 5 5.5 6 6.5 7.5 8.5 9.5 11 13 15
4AD 6 9 11 13 14 15 17 19 22 24 26 30 38
4BD 10 14 17 20 22 24 26 30 34 39 42 48 59
4CD 14 19 23 27 30 33 35 41 47 52 57 67 81
5BD 19 26 32 37 42 46 50 57 65 73 79 92 115
6BD 31 44 54 62 70 77 83 95 110 120 130 150 -
6CD 46 65 79 92 100 115 120 135 155 175 195 225 -
8BD 75 105 125 145 160 175 190 220 250 280 310 350 -
8CD 105 145 180 210 235 260 275 310 360 405 445 - -
12AD 155 220 270 310 350 380 410 465 540 600 - - -
12BD 250 350 430 500 560 610 660 750 870 970 - - -

For maximum service life, lubricate well and use a cover when operating in the tinted area.

SERVICE FACTORS Straight and Diagonal types
Operating Characteristics Service Electric
Motor
Gas or Diesel
Engine
Uniform Load, Starting loads only slightly higher than running load. 10 hours per day 1 1.2
24 hours per day 1.3 1.5
Running load is variable, starting is frequent & starting loads high. 10 hours per day 1.4 1.6
24 hours per day 1.7 1.9
Starting loads are very heavy, continuous shock loads, reversing 10 hours per day 1.6 1.9
24 hours per day 2 2.5
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