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Product Specifications:
| Item | Gear |
| Bore Dia. | 5/8" |
| Diametral Pitch | 20 |
| Face Width | 3/8" |
| Hardened Teeth | Without Hardened Teeth |
| Hub Dia. | 1.69" |
| Keyway | Double Keyway 180° Apart |
| Kwy/setscrew/other | With Double Kwy Only |
| Length Through Bore | 1" |
| Material | Cast Iron |
| Maximum Rated Torque | 85.8 N-m @ 600 RPM |
| Maximum Torque Rating | 85.8 lbs.-in. @ 600 RPM |
| No. Of Teeth | 91 |
| Outer Dia. | 4.65" |
| Pitch Dia. | 4.55" |
| Pressure Angle | 14.5° |
| Product Datasheet | boston-gear-g101.pdf |
| Torque At 200 Rpm | 133 lbs.-in. |
| Torque At 300 Rpm | 117 lbs.-in. |
| Torque At 600 Rpm | 85.8 lbs.-in. |
| Torque At 900 Rpm | 67.2 lbs.-in. |
Shipping Info:
| Ship weight (kg) | 0.42 |
| 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. | Type | Pressure Angle | Bore Dia. | Face Width | Material | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
GA51B | 20" | 2.55" | 1.38" | Plain | 14.5° | 5/8" | 3/8" | Cast Iron | €156.27 | |
![]() |
GA52B | 20 | 2.6" | 1.38" | - | 14.5° | 5/8" | 3/8" | Cast Iron | €161.10 | |
![]() |
GA53B | 20" | 2.65" | 1.38" | Plain | 14.5° | 5/8" | 3/8" | Cast Iron | €161.10 | |
![]() |
GA54B | 20" | 2.7" | 1.38" | Plain | 14.5° | 5/8" | 3/8" | Cast Iron | €164.12 | |
![]() |
GA55B | 20" | 2 3/4" | 1.38" | Plain | 14.5° | 5/8" | 3/8" | Cast Iron | €161.27 | |
![]() |
GA56B | 20" | 2 4/5" | 1.38" | Plain | 14.5° | 5/8" | 3/8" | Cast Iron | €161.27 | |
![]() |
GA57B | 20" | 2.85" | 1.38" | Plain | 14.5° | 5/8" | 3/8" | Cast Iron | €170.16 |
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Contact us
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BOSTON GEAR GA91B Change Gear, 20 Diametral Pitch, 14 1/2 Deg. Pressure Angle, 91 Teeth, Cast Iron
€216.48 /unit







