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Selection Guide / Technical Info.
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Worm Gear Mating Wheels Selection Chart
KHK BG4-20L1, Module 4, 20 Tooth, Single Start, Left Hand, Bronze Worm Wheels
Bronze Worm Wheels (BG)
Bronze Worm Wheels (BG)
Phosphorous bronze worm wheels have excellent wear resistance. Interchangeable with CG Worm Wheels, and enhances strength.
Please note that all J-Series, F-Series, & H-Series products are made-to-order, noncancellable, and non-returnable.
Notice: This product is discontinued but will be available on a made to order custom basis once current inventory runs out.
KHK BG4-20L1, Module 4, 20 Tooth, Single Start, Left Hand, Bronze Worm Wheels Specifications
Metric
Inch
Gear Type
Worm Gears
Construction
Bronze Worm Wheels
Bore Type
Plain
Number of Start
1
Nominal Lead Angle
3°42'
Hand of Thread
Left Hand
Reduction Ratio
20
Module
4
No. of teeth
20
Profile Shift Coefficient
-0.021
Shape
H1
Bore (A)
20.0
(mm)
Hub Diameter (B)
60.0
(mm)
Pitch Diameter (C)
80.17
(mm)
Throat Diameter (D)
88.0
(mm)
Outer Diameter (D')
90.0
(mm)
Mounting Distance (J)
71.0
(mm)
Face Width (E)
35.0
(mm)
Hub Width (F)
17.0
(mm)
Total Length (G)
52.00
(mm)
Backlash
0.17-0.37
(mm)
Weight
1.91000
(kg)
Precision Grade
KHK W 002 grade 4
Reference Section of Gear
Normal Plane
Gear Teeth Type
Standard full depth
Helix Angle
3°42'
Pressure Angle
14°30'
Material
CAC502 Bronze (formerly JIS PBC2)