Acrow ST20-WER20-125 – WER-ST Tapping Chuck (ER20, Ø1–13 mm Range, 125 mm L)

Acrow ST20-WER20-125 – Straight Shank Tapping Chuck (ER20, Ø1–13 mm Capacity, 125 mm Length)

The Acrow ST20-WER20-125 is a precision straight shank WER tapping chuck designed for ER20 collets, offering a Ø1–13 mm gripping capacity and supporting tapping applications from M03 to M12. Built with an axial compression–tension system, it compensates for feed mismatches during tapping, reduces tap breakage, and improves thread accuracy. The 20 mm straight shank makes it ideal for mounting into collet chucks, end mill holders, or manual machines. With a compact 125 mm overall length, it provides excellent rigidity and performance for general and precision tapping operations.

Specifications:

• Brand: Acrow
• Type: Straight Shank WER Tapping Chuck
• Model: ST20-WER20-125
• Figure No.: 1
• Capacity (Ø Range): 1.0 – 13.0 mm
• Tapping Range: M03 – M12
• Collet System: ER20
• Shank Diameter (ØD): 20 mm
• Body Diameter (ØD1): 34 mm
• Overall Length (L): 125 mm
• Gauge Length (L1): 55 mm
• Length Flexibility – Compression (Comp.): 3 mm
• Length Flexibility – Tension (Tens.): 7 mm
• Material: Hardened Alloy Steel
• Surface Finish: Precision Ground
• Run-out Accuracy: ≤ 0.01 mm
• Application: Suitable for both CNC and manual tapping setups using ER20 tap shanks, offering excellent stability, axial compensation, and thread quality.