Attributes

Key Value
(hidden - do not show) .SB1.25xR2m1.25x2040
(hidden) Bevel Gear Typ.Metric x Straight SB1.2.
(hidden) Boston Gear bu.SB1.25-4020 Black Oxide.
(hidden) paired bevel b.SB1.25-4020 x R 2 x 1.25
(hidden) surface treatm.Black Oxide SB1.25-4020
(hidden) tooth finish t.SB1.25-4020 Black Oxide.
Bore Diameter10 mm
Bore Diameter ToleranceH7
Bore TypePlain
Country of Origin (subj.Japan
Face Width8 mm
FinishBlack Oxide
Gear Material & FinishBlack Oxide Coated Carb.
Gear ShapeB4
Hub Diameter32 mm
Hub Projection10 mm
ItemBevel Gear
Material GradeS45C
Maximum Teeth Hardness194 HB
Metric Module Pitch1.25
Mounting Distance27 mm
Number of Teeth40
Outside Diameter50.73 mm
Overall Length18.54 mm
Pitch Diameter50 mm
Precision ClassJIS B 1704:1978 Grade 3
Pressure Angle20 Degrees
Ratio2
Surface TreatmentBlack Oxide-Coated
System of MeasurementMetric
Tooth Finish TypeNon-Ground
Tooth FormStraight
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