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Internal Expansion Lock D20-D22 127x127x70.5mm, with Bottom Zero Point Bolt
Precision Internal Expansion Lock D20-D22 designed for CNC workholding, 5-axis machining, EDM workholding, and repeatable fixture setups. Built from chrome steel with 44–52 HRC hardness, this holder provides ±0.01mm repeatability and an internal expansion range of Ø20–22mm, with custom sizing available on request. Its 127x127x70.5mm body and bottom zero point bolt interface support accurate positioning, stable internal clamping, and efficient fixture changeover.
SKU: RHS-ZP960015
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Description
This 127x127x70.5mm Internal Expansion Lock D20-D22 is designed for precision CNC workholding applications where the workpiece needs to be clamped from an internal bore. The internal expansion design holds the part from the inside, helping keep the outside surfaces open for 5-axis machining, multi-sided machining, EDM workholding, and inspection applications.
Made from chrome steel, the holder provides rigidity, wear resistance, and stable performance during repeated production use. The Ø20–22mm expansion range is suitable for precision bore clamping, with custom sizing available based on specific workpiece requirements. With ±0.01mm repeatability and a bottom zero point bolt interface, this internal expansion lock supports accurate fixture positioning, fast setup changes, and dependable workholding stability in precision machining environments.
| Specification | Value |
| Size | 127x127x70.5mm |
| Material | Chrome Steel |
| Product Type | Internal Expansion Lock D20-D22 |
| Mounting Interface | Bottom Zero Point Bolt |
| Hardness | 44–52 HRC |
| Expansion Range | Ø20–22mm |
| Customization | Expansion size can be customized as required |
| Repeatability | ±0.01mm |
| Net Weight | 3.78kg |
| Overall Length | 127mm |
| Overall Width | 127mm |
| Overall Height | 70.5mm |
| Base Height Reference | 20mm |
| Round Body Diameter Reference | Ø95mm |
| Expansion Post Diameter Reference | Ø19.4mm |
| Expansion Post Height Reference | 25.5mm |
| Mounting Type | Zero Point Bolt Mounting from Bottom |
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Additional information
| Weight | 3.78 kg |
|---|---|
| Dimensions | 12.7 × 12.7 × 7.05 cm |
| Material for Vises | Stainless Steel |
| Compatibility for vises | Zero-Point Bolts |
| Zero-Point Adaptable | 96mm |
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