Worm Gears: 12 Diameter Pitch Index

14-1/2° Pressure Angle

Right Hand (can be furnished Left Hand)
Worm Gears (Single Thread)
1/2″ Face

Number of Teeth Pitch diameter Center Distance Stock Bore Hub Diameter Hub Projection Catalog Number
Bronze Cast Iron
18 1.500" 1.250" 1/2" 1-1/4" 5/8" BW-1218-S IW-1218-S
20 1.666" 1.333" 1/2" 1-1/4" 5/8" BW-1220-S **IW-1220-S
24 2.000" 1.500" 1/2" 1-1/4" 5/8" BW-1224-S IW-1224-S
30 2.500" 1.750" 1/2" 1-1/4" 5/8" BW-1230-S **IW-1230-S
36 3.000" 2.000" 1/2" 1-1/4" 5/8" BW-1236-S IW-1236-S
40 3.333" 2.166" 5/8" 1-1/2" 3/4" BW-1240-S **IW-1240-S
48 4.000" 2.500" 5/8" 1-1/2" 3/4" BW-1248-S IW-1248-S
50 4.166" 2.583" 5/8" 1-1/2" 3/4" BW-1250-S **IW-1250-S
60 5.000" 3.000" 5/8" 1-3/4" 3/4" BW-1260-S **IW-1260-S
72 6.000" 3.500" 5/8" 1-3/4" 3/4" BW-1272-S IW-1272-S
80 6.666" 3.833" 5/8" 2" 3/4" BW-1280-S **IW-1280-S
96 8.000" 4.500" 3/4" 2" 3/4" BW-1296-S **IW-1296-S

Right Hand (can be furnished Left Hand
Steel Worms (Single Thread)
4° 46′ Helix Angle

Face Pitch diameter Center Distance Stock Bore Hub Diameter Hub Projection Hub Pin Size Catalog Number
Bronze Cast Iron
1-1/8" 1" * 1/2" 3/4" 3/8" N/A N/A **SW-1200
1-1/8" 1" * 1/2" N/A N/A 1/8" **HW-1202 N/A
1-5/8" 1" * 1/2" N/A N/A 1/8" HW-1203 SW-1203

Right Hand (can be furnished Left Hand)
Worm Gears (Double Thread)
1/2″ Face

Number of Teeth Pitch diameter Center Distance Stock Bore Hub Diameter Hub Projection Catalog Number
Bronze Cast Iron
†20 1.666" 1.333" 1/2" 1-1/4" 5/8" BW-1220-D **IW-1220-D
20 1.666" 1.333" 1/2" 1-1/4" 1/2" BW-1220B-D IW-1220B-D
24 2.000" 1.500" 1/2" 1-1/4" 5/8" BW-1224-D IW-1224-D
†30 2.500" 1.750" 1/2" 1-1/4" 5/8" BW-1230-D **IW-1230-D
30 2.500" 1.750" 3/4" 1-1/4" 5/8" BW-1230B-D IW-1230B-D
36 3.000" 2.000" 1/2" 1-1/4" 5/8" BW-1236-D IW-1236-D
†40 3.333" 2.166" 5/8" 1-1/2" 3/4" BW-1240-D **IW-1240-D
40 3.333" 2.166" 3/4" 1-1/2" 5/8" BW-1240B-D **IW-1240B-D
48 4.000" 2.500" 5/8" 1-1/2" 3/4" BW-1248-D IW-1248-D
†50 4.166" 2.583" 5/8" 1-1/2" 3/4" BW-1250-D **IW-1250-D
50 4.166" 2.583" 3/4" 1-1/2" 5/8" BW-1250B-D IW-1250B-D
†60 5.000" 3.000" 5/8" 1-3/4" 3/4" BW-1260-D **IW-1260-D
60 5.000" 3.000" 3/4" 1-3/4" 5/8" BW-1260B-D **IW-1260B-D
†80 6.666" 3.833" 5/8" 2" 3/4" BW-1280-D **IW-1280-D
80 6.666" 3.833" 3/4" 2" 3/4" BW-1280B-D IW-1280B-D
96 8.000" 4.500" 3/4" 2" 3/4" BW-1296-D **IW-1296-D

Right Hand (can be furnished Left Hand)
Steel Worms (Double Thread)
9° 28′ Helix Angle

Face Pitch diameter Center Distance Stock Bore Hub Diameter Hub Projection Hub Pin Size Catalog Number
Bronze Cast Iron
1-1/8" 1" * 1/2" 3/4" 3/8" N/A N/A **SW-1205
1-1/8" 1" * 5/8" N/A N/A 1/8" *HW-1207 **SW-1207
1-5/8" 1" * 5/8" N/A N/A 1/8" HW-1208 SW-1208

Right Hand (can be furnished Left Hand)
Worm Gears (Quadruple Thread)
1/2″ Face

Number of Teeth Pitch diameter Center Distance Stock Bore Hub Diameter Hub Projection Catalog Number
Bronze Cast Iron
†20 1.666" 1.333" 1/2" 1-1/4" 5/8" BW-1220-Q IW-1220-Q
20 1.666" 1.333" 1/2" 1-1/4" 1/2" BW-1220B-Q IW-1220B-Q
†30 2.500" 1.750" 1/2" 1-1/4" 5/8" BW-1230-Q IW-1230-Q
30 2.500" 1.750" 3/4" 1-1/4" 5/8" BW-1230B-Q IW-1230B-Q
†40 3.333" 2.166" 5/8" 1-1/2" 3/4" BW-1240-Q IW-1240-Q
40 3.333" 2.166" 3/4" 1-1/2" 5/8" BW-1240B-Q IW-1240B-Q
†50 4.166" 2.583" 5/8" 1-1/2" 3/4" BW-1250-Q IW-1250-Q
50 4.166" 2.583" 3/4" 1-1/2" 5/8" BW-1250B-Q IW-1250B-Q
†60 5.000" 3.000" 5/8" 1-3/4" 3/4" BW-1260-Q IW-1260-Q
60 5.000" 3.000" 3/4" 1-3/4" 5/8" BW-1260B-Q IW-1260B-Q
†80 6.666" 3.833" 5/8" 2" 3/4" BW-1280-Q IW-1280-Q
80 6.666" 3.833" 3/4" 2" 3/4" BW-1280B-Q IW-1280B-Q
96 8.000" 4.500" 3/4" 2" 3/4" BW-1296-Q IW-1296-Q

Right Hand (can be furnished Left Hand)
Steel Worms (Quadruple Thread)
18° 26′ Helix Angle

Face Pitch diameter Center Distance Stock Bore Hub Diameter Hub Projection Hub Pin Size Catalog Number
Bronze Cast Iron
1-1/8" 1" * 1/2" 3/4" 3/8" N/A N/A SW-1210
1-1/8" 1" * 5/8" N/A N/A 1/8" HW-1212 **SW-1212

† = Obsolete Style – Available only from existing stock.

* = Steel worms will operate on center distance shown for specific gear size.

** = Worms and Gears so marked are available from stock in Left Hand at stock gear prices. Those not marked are also available in Left Hand on special order and quoted price.

Note: All gears listed will be shipped "Right Hand" unless specified.