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Product Specifications:
| Item | Spur Gear |
| Bore Size | 1" |
| Bore Type | Bored To Size |
| Diametral Pitch | 6 |
| Hardened Teeth | Without Hardened Teeth |
| Hub Dia. | 2.95" |
| Keyway | With Setscrew |
| Length Through Bore | 2 7/8" |
| Material | Steel |
| No. Of Teeth | 21 |
| Outside Dia. | 3.83" |
| Pitch Dia. | 3 1/2" |
| Pressure Angle | 20° |
| Set Screw | Yes |
| Set Screw Size | 1 |
| Torque @ 1200 Rpm | 1345 lbs.-in. |
| Torque @ 200 Rpm | 2919 lbs.-in. |
| Torque @ 300 Rpm | 2613 lbs.-in. |
| Torque @ 600 Rpm | 1988 lbs.-in. |
| Torque @ 900 Rpm | 1605 lbs.-in. |
| Type | A |
Shipping Info:
| Ship weight (kg) | 2.93 |
| Ship height (cm) | 2.54 |
| Ship length (cm) | 2.54 |
| Ship width (cm) | 2.54 |
| Country of Origin | US |
Product Variants
| Product | Model | Pitch Dia. | No. Of Teeth | Hub Dia. | Diametral Pitch | Type | Bore Size | Torque | Max. Torque | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
YJ12 | 2" | 12 | 1.45" | 6 | - | 1" | 635 lbs.-in. @1800 RPM | 635 lbs.-in. @ 1800 RPM | €177.85 | |
![]() |
YJ14 | 2.33" | 14 | 1.78" | 6 | - | 1" | 967 lbs.-in. @1200 RPM | 967 lbs.-in. @ 1200 RPM | €201.74 | |
![]() |
YJ15 | 2.5" | 15 | 1.95" | 6 | - | 1" | 1043 lbs.-in. @1200 RPM | 1043 lbs.-in. @ 1200 RPM | €218.94 | |
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YJ16 | 2.67" | 16 | 2.13" | 6 | - | 1" | 1095 lbs.-in. @1200 RPM | 1095 lbs.-in. @ 1200 RPM | €221.78 | |
![]() |
YJ18 | 3" | 18 | 2.45" | 6 | - | 1" | 1197 lbs.-in. @1200 RPM | 1197 lbs.-in. @ 1200 RPM | €244.20 | |
![]() |
YJ21 | 3.5" | 21 | 2.95" | 6 | - | 1" | 1605 lbs.-in. @ 900 RPM | 1605 lbs.-in. @ 900 RPM | €299.03 | |
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YJ24A | 4" | 24 | 3" | 6" | Plain | - | - | - | €358.21 |
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Contact us
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We're available Monday through Friday, from 07:30 until 17:00.
BOSTON GEAR YJ21-1 External Tooth Spur Gear
€364.32 /unit







