Autogrip CBD-65A6 65mm Quick Change Collet Chuck to fit A2-6 Spindle. Specifically fits all Haas ST-15 lathes and Haas ST-20 lathes after May 2019. Will fit others but I'm not knowledgable enough to offer advice. I miss-ordered this to fit my DS-30Y and it doesn't fit. My loss is your gain.
This chuck is compatible with Hardinge FlexC 65 Collets or Royal Quick-Grip 65 Collets. It is a dead length style chuck. Autogrip Dead length Collet Chuck:-Compatible with Haas ST-15 and ST-20 lathes with 2.5 (63.5mm) bar capacity, including long-bed versions and Y-axis-Please note this collet chuck is only compatible with ST-20 lathes built after May 2019-Collet changes in seconds (requires handheld collet changing tool)-High clamping accuracy and rigidity-Sealed design for long life and minimal maintenance-Uses rubber grip collets for better grip and larger gripping rangeWill fit other makes of machines but please use the drawing to confirm fitment to you application.I'm obviously not qualified to make recommendations.