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Product Specifications:
| Item | Retention Knob |
| Angle Radius | 90° |
| Coolant Fed | Non-Coolant Through |
| Coolant Supply | Non Coolant Through |
| Features | Piloted |
| Flange To Angle Length | 25.1 mm |
| Knob Outside Dia. | 14.96 mm |
| Neck Dia. | 9 24/25" |
| Overall Length | 57.15 mm |
| Standards | Mas |
| Taper Size | BT40 |
| Thread Size | 5/8"-11 |
Shipping Info:
| Ship weight (kg) | 0.07 |
| Ship height (cm) | 2.54 |
| Ship length (cm) | 5.72 |
| Ship width (cm) | 2.54 |
| Country of Origin | US |
Product Variants
| Product | Model | Angle Radius | Flange To Angle Length | Knob Outside Dia. | Neck Dia. | Coolant Fed | Taper Size | Coolant Hole Dia. | Style Designation | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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RK40ISBM | 45° | 11 mm | 18.8 mm | 12.8 mm | Coolant Through | 40 | 7.5 mm | B | €52.10 | |
![]() |
RK40ISAM | 75° | 20 mm | 18.95 mm | 13.95 mm | Coolant Through | 40 | 7.05 mm | B | €98.15 | |
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RK50AV1M | 45° | 17.95 mm | 29.1 mm | 19.6 mm | Coolant Through | 50 | 11.55 mm | - | €141.16 | |
![]() |
RK50ISAM | 75° | 25 mm | 27.95 mm | 20.95 mm | Coolant Through | 50 | 11.55 mm | A | €136.89 | |
![]() |
RK30BT1M | 45° | 17.95 mm | 10.95 mm | 6.95" | Non-Coolant Through | BT30 | - | - | €110.69 | |
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RK30BT2M | 60° | 17.95 mm | 10.95 mm | 6.95" | Non-Coolant Through | BT30 | - | - | €110.69 | |
![]() |
RK40BT1M | 45° | 27.95 mm | 14.95 mm | 9.95" | Non-Coolant Through | BT40 | - | - | €129.96 |
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Contact us
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We're available Monday through Friday, from 07:30 until 17:00.
ERICKSON RK31114B Retention Knob, Bt40 Taper Size, 5/8 Inch Size-11 Thread Size, 90 Deg. Angle Radius
€62.47 /unit



