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Description
Lathe reduction sleeve Ø20 mm to 12 mm – precision adapter for boring bars
| Technical data | |
|---|---|
| Shank diameter D | 20 mm |
| Diameter of clamped tool d | 12 mm |
| Overall length L | 100 mm |
Lathe reduction sleeve Ø20 mm to 12 mm – adapter for large boring bars
Lathe reduction sleeve Ø20 mm to 12 mm is used to mount boring bars with a Ø12 mm shank in tool posts with a Ø20 mm bore. The Varel Ø20 mm to 12 mm lathe sleeve ensures stable clamping of larger tools designed for machining medium- and large-diameter holes.
Benefits of the SHB Ø20 to 12 mm reduction sleeve
- Large Ø12 mm internal diameter — allows use with boring bars for holes from 16 mm upward and with internal grooving tools
- Precision manufacturing with a thin wall — maintains concentricity despite the small difference between the outside and inside diameters
- Three hex socket clamping screws — securely lock the tool shank, preventing movement during cutting
- External flat on the Ø19 mm diameter — a standard size that fits most lathe tool posts
- Maximum use of the working space — a small diameter reduction means a shorter distance from the tool post to the cutting edge
The Ø20 mm to 12 mm lathe adapter bridges the gap between a standard tool post bore and tools requiring a Ø12 mm shank. This configuration is common when boring holes larger than 16 mm, where tool rigidity is critical to surface finish. The Ø20 mm to 12 mm lathe sleeve with three-point clamping works on CNC lathes and conventional machines, providing quick setup changes without replacing the entire tool post.
Frequently asked questions
The sleeve accommodates indexable boring bars with a Ø12 mm shank, as well as internal grooving and facing tools.
Insert the tool shank into the bore and tighten all 3 hex socket screws in sequence, ensuring even pressure.
The sleeve fits tool posts with a Ø20 mm bore with a flat at 19 mm. We recommend checking the dimensions before placing an order.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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