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Product Specifications:
| Item | Gear |
| Bore Dia. | 1 3/8" |
| Bushing Series | GA Series |
| Diametral Pitch | 8 |
| Face Width | 1 1/4" |
| Hardened Teeth | Without Hardened Teeth |
| Hub Dia. | 3.12" |
| Keyway | Double Keyway 180° Apart |
| Kwy/setscrew/other | With Double Kwy Only |
| Length Through Bore | 2 1/2" |
| Material | Cast Iron |
| Maximum Rated Torque | 1156 N-m @ 300 RPM |
| Maximum Torque Rating | 1156 lbs.-in. @ 300 RPM |
| No. Of Teeth | 51 |
| Outer Dia. | 3.63" |
| Pitch Dia. | 6 3/8" |
| Pressure Angle | 14.5° |
| Product Datasheet | boston-gear-g101.pdf |
| Torque At 200 Rpm | 1275 lbs.-in. |
| Torque At 300 Rpm | 1088 lbs.-in. |
| Torque At 600 Rpm | 756 lbs.-in. |
| Torque At 900 Rpm | 579 lbs.-in. |
Shipping Info:
| Ship weight (kg) | 2.88 |
| Ship height (cm) | 2.54 |
| Ship length (cm) | 2.54 |
| Ship width (cm) | 2.54 |
| Country of Origin | US |
Documentation:
Product Variants
| Product | Model | Diametral Pitch | Pitch Dia. | Hub Dia. | Bore Dia. | Type | Face Width | Pressure Angle | Material | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
GH25B | 8 | 3 1/8" | 2.06" | 1 3/8" | - | 1 1/4" | 14.5° | Cast Iron | €335.66 | |
![]() |
GH26B | 8 | 3 1/4" | 2.06" | 1 3/8" | - | 1 1/4" | 14.5° | Cast Iron | €343.96 | |
![]() |
GH28B | 8" | 3 1/2" | 2.06" | 1 3/8" | Plain | 1 1/4" | 14.5° | Cast Iron | €352.26 | |
![]() |
GH29B | 8 | 3 5/8" | 2.06" | 1 3/8" | - | 1 1/4" | 14.5° | Cast Iron | €368.10 | |
![]() |
GH30B | 8" | 3 3/4" | 2.06" | 1 3/8" | Plain | 1 1/4" | 14.5° | Cast Iron | €372.91 | |
![]() |
GH31B | 8 | 3 7/8" | 2.06" | 1.38" | - | 1 1/4" | 14.5° | Cast Iron | €383.94 | |
![]() |
GH32B | 8 | 4" | 2.06" | 1.38" | - | 1 1/4" | 14.5° | Cast Iron | €391.33 |
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Contact us
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We're available Monday through Friday, from 07:30 until 17:00.
BOSTON GEAR GH51A Change Gear, 8 Diametral Pitch, 14 1/2 Deg. Pressure Angle, 51 Teeth, Cast Iron
€600.42 /unit







