Change Gears

Change Gears

Change Gears

Product Details

Change Gears


Gear change gears are manufactured with a double key to accept the compound steel bushings that connect two gears together, allowing them to spin on an intermediate shaft. The change gears we stock range from 20-tooth through 128-tooth gears, in one tooth increments, depending upon the diametral pitch, for a nearly infinite number of ratio possibilities.



Change Gears are primarily used in machinery where gear ratios are frequently changed. Every consecutive number of teeth are available from 20 teeth to 128 teeth (up to 200 teeth in some pitches). Change Gears are flat plain style spur gears without hubs.


A "gear-train" or series of change gears may operate together in trains of idler gears mounted on compound double keyway bushings.


Change Gears are referred to as the "G" series part numbers in the range of 20 teeth and up, each gear having the same bore, face and double keyway dimensions for a given pitch. Two gears may be assembled on a single change gear bushing to form a single compound unit.


"A" series Change Gears are furnished with smaller minimum plain bores which can be re-bored to suit varying shaft sizes. "A" series gears start at 10 teeth.


Change Gears are interchangeable with other types of Spur Gears including Internal Gears, Stem Pinions and Gear Rack.

Change Gearsimage


A PA of 14 1/2° ensures smooth, quiet operation.

These change gears are available in both steel and cast iron to suit a variety of application requirements.

Compound steel bushings specifically designed for these change gears are available to maximize performance.

Code Pitch Diameter Weight
20EP20 1 .05lbs
20EP21 1.05 .06lbs
20EP22 1.1 .07lbs
20EP23 1.15 .08lbs
20EP24 1.2 .09lbs
20EP25 1.25 .10lbs
20EP26 1.3 .11lbs
20EP27 1.35 .12lbs
20EP28 1.4 .13lbs
20EP29 1.45 .14lbs
20EP30 1.5 .16lbs
20EP31 1.55 .17lbs
20EP32 1.6 .19lbs
20EP33 1.65 .20lbs
20EP34 1.7 .22lbs
20EP35 1.75 .24lbs
20EP36 1.8 .26lbs
20EP37 1.85 .28lbs
20EP38 1.9 .30lbs
20EP39 1.95 .32lbs
20EP40 2 .33lbs
20EP41 2.05 .34lbs
20EP42 2.1 .36lbs
20EP43 2.15 .37lbs
20EP44 2.2 .38lbs
20EP45 2.25 .40lbs
20EP46 2.3 .42lbs
20EP47 2.35 .44lbs
20EP48 2.4 .46lbs
20EP49 2.45 .48lbs
20EP50 2.5 .50lbs
20EP51 2.55 .52lbs
20EP52 2.6 .54lbs
20EP53 2.65 .56lbs
20EP54 2.7 .58lbs
20EP55 2.75 .60lbs
20EP56 2.8 .62lbs
20EP57 2.85 .64lbs
20EP58 2.9 .66lbs
20EP59 2.95 .68lbs
20EP60 3 .72lbs
20EP61 3.05 .76lbs
20EP62 3.1 .79lbs
20EP63 3.15 .82lbs
20EP64 3.2 .83lbs
20EP65 3.25 .85lbs
20EP66 3.3 .91lbs
20EP67 3.35 .94lbs
20EP68 3.4 .97lbs
20EP69 3.45 .99lbs
20EP70 3.5 1.00lbs
20EP71 3.55 1.10lbs
20EP72 3.6 1.10lbs
20EP73 3.65 1.10lbs
20EP74 3.7 1.20lbs
20EP75 3.75 1.20lbs
20EP76 3.8 1.20lbs
20EP77 3.85 1.30lbs
20EP78 3.9 1.30lbs
20EP79 3.95 1.40lbs
20EP80 4 1.40lbs
20EP81 4.05 1.40lbs
20EP82 4.1 1.40lbs
20EP83 4.15 1.50lbs
20EP84 4.2 1.50lbs
20EP85 4.25 1.50lbs
20EP86 4.3 1.60lbs
20EP87 4.35 1.60lbs
20EP88 4.4 1.60lbs
20EP89 4.45 1.60lbs
20EP90 4.5 1.70lbs
20EP91 4.55 1.70lbs
20EP92 4.6 1.80lbs
20EP93 4.65 1.80lbs
20EP94 4.7 1.80lbs
20EP95 4.75 1.90lbs
20EP96 4.8 1.90lbs
20EP97 4.85 2.00lbs
20EP98 4.9 2.00lbs
20EP99 4.95 2.00lbs
20EP100 5 2.10lbs
20EP101 5.05 2.10lbs
20EP102 5.1 2.20lbs
20EP103 5.15 2.20lbs
20EP104 5.2 2.30lbs
20EP105 5.25 2.30lbs
20EP106 5.3 2.40lbs
20EP107 5.35 2.40lbs
20EP108 5.4 2.40lbs
20EP109 5.45 2.50lbs
20EP110 5.5 2.50lbs
20EP111 5.55 2.60lbs
20EP112 5.6 2.60lbs
20EP113 5.65 2.70lbs
20EP114 5.7 2.70lbs
20EP115 5.75 2.70lbs
20EP116 5.8 2.80lbs
20EP117 5.85 2.80lbs
20EP118 5.9 2.90lbs
20EP119 5.95 2.90lbs
20EP120 6 3.00lbs
16 Diametral Pitch - 1/2" Face - 14 1/2º Pressure Angle - - 3/4" Bore With 2 - 3/16" x 3/32" Keyways 180º Apart
16EP20 1.25 .06lbs
16EP21 1.312 .07lbs
16EP22 1.375 .09lbs
16EP23 1.437 .11lbs
16EP24 1.5 .14lbs
16EP25 1.562 .16lbs
16EP26 1.625 .19lbs
16EP27 1.687 .20lbs
16EP28 1.75 .23lbs
16EP29 1.812 .25lbs
16EP30 1.875 .29lbs
16EP31 1.937 .32lbs
16EP32 2 .32lbs
16EP33 2.062 .35lbs
16EP34 2.125 .38lbs
16EP35 2.187 .41lbs
16EP36 2.25 .46lbs
16EP37 2.312 .48lbs
16EP38 2.375 .51lbs
16EP39 2.437 .55lbs
16EP40 2.5 .58lbs
16EP41 2.562 .61lbs
16EP42 2.625 .64lbs
16EP43 2.687 .69lbs
16EP44 2.75 .74lbs
16EP45 2.812 .76lbs
16EP46 2.875 .80lbs
16EP47 2.937 .84lbs
16EP48 3 .88lbs
16EP49 3.062 .92lbs
16EP50 3.125 .97lbs
16EP51 3.187 1.00lbs
16EP52 3.25 1.10lbs
16EP53 3.312 1.10lbs
16EP54 3.375 1.10lbs
16EP55 3.437 1.20lbs
16EP56 3.5 1.20lbs
16EP57 3.562 1.30lbs
16EP58 3.625 1.30lbs
16EP59 3.687 1.40lbs
16EP60 3.75 1.40lbs
16EP61 3.812 1.50lbs
16EP62 3.875 1.50lbs
16EP63 3.937 1.60lbs
16EP64 4 1.60lbs
16EP65 4.062 1.70lbs
16EP66 4.125 1.70lbs
16EP67 4.187 1.80lbs
16EP68 4.25 1.90lbs
16EP69 4.312 1.90lbs
16EP70 4.375 2.00lbs
16EP71 4.437 2.10lbs
16EP72 4.5 2.10lbs
16EP73 4.562 2.20lbs
16EP74 4.625 2.20lbs
16EP75 4.687 2.30lbs
16EP76 4.75 2.40lbs
16EP77 4.812 2.50lbs
16EP78 4.875 2.50lbs
16EP79 4.937 2.60lbs
16EP80 5 2.70lbs
16EP81 5.062 2.70lbs
16EP82 5.125 2.80lbs
16EP83 5.187 2.90lbs
16EP84 5.25 2.90lbs
16EP85 5.312 3.00lbs
16EP86 5.375 3.10lbs
16EP87 5.437 3.20lbs
16EP88 5.5 3.20lbs
16EP89 5.562 3.30lbs
16EP90 5.625 3.40lbs
16EP91 5.687 3.50lbs
16EP92 5.75 3.50lbs
16EP93 5.812 3.70lbs
16EP94 5.875 3.80lbs
16EP95 5.937 3.90lbs
16EP96 6 4.00lbs
16EP97 6.062 4.10lbs
16EP98 6.125 4.20lbs
16EP99 6.187 4.20lbs
16EP100 6.25 4.30lbs
16EP101 6.312 4.40lbs
16EP102 6.375 4.50lbs
16EP103 6.437 4.60lbs
16EP104 6.5 4.70lbs
16EP105 6.562 4.70lbs
16EP106 6.625 4.80lbs
16EP107 6.687 4.90lbs
16EP108 6.75 5.00lbs
16EP109 6.812 5.10lbs
16EP110 6.875 5.20lbs
16EP111 6.937 5.30lbs
16EP112 7 5.40lbs
16EP113 7.062 5.50lbs
16EP114 7.125 5.60lbs
16EP115 7.187 5.70lbs
16EP116 7.25 5.80lbs
16EP117 7.312 5.90lbs
16EP118 7.375 6.00lbs
16EP119 7.437 6.10lbs
16EP120 7.5 6.20lbs
16EP121 7.562 6.30lbs
16EP122 7.625 6.40lbs
16EP123 7.687 6.50lbs
16EP124 7.75 6.60lbs
16EP125 7.812 6.70lbs
16EP126 7.875 6.80lbs
16EP127 7.937 6.90lbs
16EP128 8 7.00lbs
16EP129 8.062 7.10lbs
Change Gears
12EP20 1.666 .26lbs
12EP21 1.75 .32lbs
12EP22 1.833 .37lbs
12EP23 1.916 .42lbs
12EP24 2 .49lbs
12EP25 2.083 .53lbs
12EP26 2.166 .60lbs
12EP27 2.25 .66lbs
12EP28 2.333 .73lbs
12EP29 2.416 .80lbs
12EP30 2.5 .87lbs
12EP31 2.583 .95lbs
12EP32 2.666 1.00lbs
12EP33 2.75 1.10lbs
12EP34 2.833 1.20lbs
12EP35 2.916 1.20lbs
12EP36 3 1.30lbs
12EP37 3.083 1.40lbs
12EP38 3.166 1.50lbs
12EP39 3.25 1.60lbs
12EP40 3.333 1.70lbs
12EP41 3.416 1.80lbs
12EP42 3.5 1.90lbs
12EP43 3.583 2.00lbs
12EP44 3.666 2.10lbs
12EP45 3.75 2.20lbs
12EP46 3.833 2.30lbs
12EP47 3.916 2.40lbs
12EP48 4 2.50lbs
12EP49 4.083 2.60lbs
12EP50 4.166 2.70lbs
12EP51 4.25 2.80lbs
12EP52 4.333 2.90lbs
12EP53 4.416 3.00lbs
12EP54 4.5 3.20lbs
12EP55 4.583 3.30lbs
12EP56 4.666 3.40lbs
12EP57 4.75 3.60lbs
12EP58 4.833 3.70lbs
12EP59 4.916 3.80lbs
12EP60 5 4.00lbs
12EP61 5.083 4.10lbs
12EP62 5.166 4.20lbs
12EP63 5.25 4.40lbs
12EP64 5.333 4.50lbs
12EP65 5.416 4.60lbs
12EP66 5.5 4.80lbs
12EP67 5.583 4.90lbs
12EP68 5.666 5.20lbs
12EP69 5.75 5.40lbs
12EP70 5.833 5.50lbs
12EP71 5.916 5.70lbs
12EP72 6 5.80lbs
12EP73 6.083 6.00lbs
12EP74 6.166 6.20lbs
12EP75 6.25 6.40lbs
12EP76 6.333 6.60lbs
12EP77 6.416 6.80lbs
12EP78 6.5 6.90lbs
12EP79 6.583 7.10lbs
12EP80 6.666 7.20lbs
12EP81 6.75 7.40lbs
12EP82 6.833 7.60lbs
12EP83 6.916 7.80lbs
12EP84 7 8.00lbs
12EP85 7.083 8.20lbs
12EP86 7.166 8.40lbs
12EP87 7.25 8.60lbs
12EP88 7.333 8.80lbs
12EP89 7.416 9.00lbs
12EP90 7.5 9.20lbs
12EP91 7.583 9.40lbs
12EP92 7.666 9.60lbs
12EP93 7.75 9.80lbs
12EP94 7.833 10.00lbs
12EP95 7.916 10.20lbs
12EP96 8 10.50lbs
12EP97 8.083 10.60lbs
12EP98 8.166 11.00lbs
12EP99 8.25 11.10lbs
12EP100 8.333 11.40lbs
12EP101 8.416 11.60lbs
12EP102 8.5 11.90lbs
12EP103 8.583 12.20lbs
12EP104 8.666 12.40lbs
12EP105 8.75 12.60lbs
12EP106 8.833 12.90lbs
12EP107 8.916 13.10lbs
12EP108 9 13.30lbs
12EP109 9.083 13.50lbs
12EP110 9.166 13.90lbs
12EP111 9.25 14.10lbs
12EP112 9.333 14.30lbs
12EP113 9.416 14.60lbs
12EP114 9.5 14.90lbs
12EP115 9.583 15.10lbs
12EP116 9.666 15.30lbs
12EP117 9.75 15.60lbs
12EP118 9.833 15.90lbs
12EP119 9.916 16.20lbs
12EP120 10 16.50lbs
10EP20 2 .53lbs
10EP21 2.1 .69lbs
10EP22 2.2 .85lbs
10EP23 2.3 .96lbs
10EP24 2.4 1.00lbs
10EP25 2.5 1.10lbs
10EP26 2.6 1.20lbs
10EP27 2.7 1.30lbs
10EP28 2.8 1.40lbs
10EP29 2.9 1.50lbs
10EP30 3 1.60lbs
10EP31 3.1 1.70lbs
10EP32 3.2 1.90lbs
10EP33 3.3 2.00lbs
10EP34 3.4 2.20lbs
10EP35 3.5 2.40lbs
10EP36 3.6 2.50lbs
10EP37 3.7 2.60lbs
10EP38 3.8 2.80lbs
10EP39 3.9 3.00lbs
10EP40 4 3.20lbs
10EP41 4.1 3.40lbs
10EP42 4.2 3.60lbs
10EP43 4.3 3.70lbs
10EP44 4.4 3.90lbs
10EP45 4.5 4.10lbs
10EP46 4.6 4.30lbs
10EP47 4.7 4.50lbs
10EP48 4.8 4.70lbs
10EP49 4.9 4.90lbs
10EP50 5 5.20lbs
10EP51 5.1 5.40lbs
10EP52 5.2 5.60lbs
10EP53 5.3 5.90lbs
10EP54 5.4 6.10lbs
10EP55 5.5 6.40lbs
10EP56 5.6 6.60lbs
10EP57 5.7 6.80lbs
10EP58 5.8 7.00lbs
10EP59 5.9 7.30lbs
10EP60 6 7.60lbs
10EP61 6.1 7.90lbs
10EP62 6.2 8.20lbs
10EP63 6.3 8.40lbs
10EP64 6.4 8.70lbs
10EP65 6.5 9.00lbs
10EP66 6.6 9.30lbs
10EP67 6.7 9.60lbs
10EP68 6.8 9.90lbs
10EP69 6.9 10.20lbs
10EP70 7 10.50lbs
10EP71 7.1 10.80lbs
10EP72 7.2 11.20lbs
10EP73 7.3 11.50lbs
10EP74 7.4 11.80lbs
10EP75 7.5 12.10lbs
10EP76 7.6 12.50lbs
10EP77 7.7 12.80lbs
10EP78 7.8 13.10lbs
10EP79 7.9 13.50lbs
10EP80 8 13.90lbs
10EP81 8.1 14.40lbs
10EP82 8.2 14.80lbs
10EP83 8.3 15.10lbs
10EP84 8.4 15.40lbs
10EP85 8.5 15.70lbs
10EP86 8.6 16.10lbs
10EP87 8.7 16.50lbs
10EP88 8.8 16.80lbs
10EP89 8.9 17.20lbs
10EP90 9 17.60lbs
10EP91 9.1 18.00lbs
10EP92 9.2 18.40lbs
10EP93 9.3 18.90lbs
10EP94 9.4 19.30lbs
10EP95 9.5 19.70lbs
10EP96 9.6 20.00lbs
10EP97 9.7 20.00lbs
10EP98 9.8 21.00lbs
10EP99 9.9 21.00lbs
10EP100 10 22.00lbs
8EP20 2.5 1.20lbs
8EP21 2.625 1.30lbs
8EP22 2.75 1.50lbs
8EP23 2.875 1.70lbs
8EP24 3 1.90lbs
8EP25 3.125 2.10lbs
8EP26 3.25 2.30lbs
8EP27 3.375 2.50lbs
8EP28 3.5 2.80lbs
8EP29 3.625 3.00lbs
8EP30 3.75 3.30lbs
8EP31 3.875 3.50lbs
8EP32 4 3.80lbs
8EP33 4.125 4.10lbs
8EP34 4.25 4.40lbs
8EP35 4.375 4.70lbs
8EP36 4.5 5.00lbs
8EP37 4.625 5.30lbs
8EP38 4.75 5.70lbs
8EP39 4.875 6.00lbs
8EP40 5 6.30lbs
8EP41 5.125 6.70lbs
8EP42 5.25 7.00lbs
8EP43 5.375 7.40lbs
8EP44 5.5 7.80lbs
8EP45 5.625 8.20lbs
8EP46 5.75 8.60lbs
8EP47 5.875 9.00lbs
8EP48 6 9.40lbs
8EP49 6.125 9.80lbs
8EP50 6.25 10.30lbs
8EP51 6.375 10.70lbs
8EP52 6.5 11.10lbs
8EP53 6.625 11.50lbs
8EP54 6.75 12.00lbs
8EP55 6.875 12.50lbs
8EP56 7 13.00lbs
8EP57 7.125 13.50lbs
8EP58 7.25 14.00lbs
8EP59 7.375 14.50lbs
8EP60 7.5 15.00lbs
8EP61 7.625 15.50lbs
8EP62 7.75 16.00lbs
8EP63 7.875 16.60lbs
8EP64 8 17.30lbs
8EP65 8.125 17.80lbs
8EP66 8.25 18.30lbs
8EP67 8.375 18.90lbs
8EP68 8.5 19.50lbs
8EP69 8.625 20.00lbs
8EP70 8.75 21.00lbs
8EP71 8.875 21.00lbs
8EP72 9 22.00lbs
8EP73 9.125 22.00lbs
8EP74 9.25 23.00lbs
8EP75 9.375 24.00lbs
8EP76 9.5 24.00lbs
8EP77 9.625 25.00lbs
8EP78 9.75 25.00lbs
8EP79 9.875 27.00lbs
8EP80 10 27.00lbs
8EP81 10.125 28.00lbs
8EP82 10.25 28.00lbs
8EP83 10.375 29.00lbs
8EP84 10.5 30.00lbs
8EP85 10.625 31.00lbs
8EP86 10.75 32.00lbs
8EP87 10.875 32.00lbs
8EP88 11 33.00lbs
8EP89 11.125 33.00lbs
8EP90 11.25 34.00lbs
8EP91 11.375 35.00lbs
8EP92 11.5 36.00lbs
8EP93 11.625 37.00lbs
8EP94 11.75 38.00lbs
8EP95 11.875 39.00lbs
8EP96 12 40.00lbs
8EP97 12.125 40.00lbs
8EP98 12.25 41.00lbs
8EP99 12.375 42.00lbs
8EP100 12.5 43.00lbs




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