Internal Expansion Lock D20-D22 127x127x70.5mm, with Bottom Zero Point Bolt

Internal Expansion Lock D20-D22 127x127x70.5mm, with Bottom Zero Point Bolt

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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