Spur Gears: 48 Diametral Pitch Ratings

20° Pressure Angle

1/8″ Face

Number of Teeth Pitch diameter Outside Diameter Stock Bore Hub Diameter Hub Projection Style Catalog Number
Brass
Steel
12
.250
.2917
1/8
3/16
3/16
Plain
TBT4812
TST4812
15
.3125
.3542
1/8
7/32
3/16
Plain
TBT4815
TST4815
18
.375
.4166
1/8
9/32
3/16
Plain
TBT4818
TST4818
21
.4375
.4792
1/8
11/32
3/16
Plain
TBT4821
TST4821
24
.500
.5417
3/16
3/8
1/4
Plain
TBT4824
TST4824
27
.5625
.6042
3/16
7/16
1/4
Plain
TBT4827
TST4827
30
.625
.6667
3/16
7/16
1/4
Plain
TBT4830
TST4830
36
.750
.7917
3/16
1/2
1/4
Plain
TBT4836
TST4836
42
.875
.9167
3/16
9/16
1/4
Plain
TBT4842
– – – – –
48
1.0000
1.0417
1/4
5/8
1/4
Plain
TBT4848
– – – – –
54
1.125
1.1667
1/4
11/16
1/4
Plain
TBT4854
– – – – –
60
1.250
1.2917
1/4
11/16
1/4
Plain
TBT4860
– – – – –
66
1.375
1.4166
1/4
3/4
1/4
Plain
TBT4866
– – – – –
72
1.500
1.5417
1/4
3/4
1/4
Plain
TBT4872
– – – – –
84
1.750
1.7917
1/4
13/16
1/4
Plain
TBT4884
– – – – –
96
2.000
2.0417
1/4
7/8
1/4
Plain
TBT4896
– – – – –