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1.This series of chucks are the short cone type and can be directly connected to the spindle noses of the machine tools. - details see: https://www.machineto.com/three-jaw-direct-mounting-self-centring-chucks-10144973

THREE-JAW DIRECT MOUNTING SELF-CENTRING CHUCKS
1.This series of chucks are the short cone type and can be directly connected to the spindle noses of the machine tools. 2.The chucks mounting types are classified as type A1, A2, C and D. The connecting dimensions conform to GB/T5900.3 (ISO702) standards. 3.The structure types of jaws are classified as one piece jaws, two-piece jaws for form A and form C.
Form A: Mounting form Fornt
Form A1(Use Inner Tapped Holes)
D	D1	D2	D3	D4	D5	H1	h	h1	h2	d1	z-d	Item No.
200	82.563	61.9	40	133	105.8	84	14.29	12	6.5	16.3	3-M10	571400
250	82.563	61.9	40	133	104.8	93	14.29	12	6.5	16.3	3-M10	571402
	106.375	82.6	55	165	133.4	93	15.88	13	6.5	19.5	3-M12	571403
Form A2(Use Outer Tapped Holes)
D	D1	D3	D4	D5	H1	h	h1	h2	d1	z-d	Item No.
200	63.513	60	108	82.6	86		10	6.5	14.7	3-M10	571410