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1.BT,DIN69871, 2.Use normal ER collets for holding tap shank, 3.it can expand and compress, 4.tap shank can easily out - details see: https://www.machineto.com/er-expansion-tapper-specailly-for-tapping-working-10156297

er expansion tapper.
1.BT,DIN69871 standard..
2.size:BT40-TER32-100 etc

Its advantage charactris:

3.it use standard ER collets for tapping drill.

4.Because it can expand and compression,the tap shank can be pulled out easily,which can avoid shank-broken.

model no.	D	D1	model no.	D	D1
BT30xER16-70	28	31.75	BT40xER40-120	63	44.45
BT30xER20-70	34	31.75	BT40xER40-150	63	44.45
BT30xER25-70	42	31.75	BT45xER16-70	28	57.15
BT30xER32-70	50	31.75	BT45xER20-70	34	57.15
BT30xER40-80	63	31.75	BT45xER20-100	34	57.15
BT40xER16-70	28	44.45	BT45xER25-70	42	57.15
BT40xER20-70	34	44.45	BT45xER25-90	42	57.15
BT40xER20-100	34	44.45	BT45xER25-100	42	57.15
BT40xER20-150	34	44.45	BT45xER32-70	50	57.15
BT40xER25-60	42	44.45	BT45xER32-100	50	57.15
BT40xER25-70	42	44.45	BT45xER32-120	50	57.15
BT40xER25-90	42	44.45	BT45xER40-80	63	57.15
BT40xER25-100	42	44.45	BT45xER40-100	63	57.15
BT40xER25-150	42	44.45	BT45xER40-120	63	57.15
BT40xER32-70	50	44.45	BT50xER16-70	28	69.85
BT40xER32-100	50	44.45	BT50xER16-90	28	69.85
BT40xER32-150	50	44.45	BT50xER16-135	28	69.85
BT40xER40-70	63	44.45	BT50xER20-70	34	69.85
BT40xER40-80	63	44.45	BT50xER20-90	34	69.85

BT50xER20-135	34	69.85	BT50xER32-100	50	69.85
BT50xER20-150	34	69.85	BT50xER32-120	50	69.85
BT50xER20-165	34	69.85	BT50xER40-80	63	69.85
BT50xER25-70	42	69.85	BT50xER40-100	63	69.85
BT50xER25-135	42	69.85	BT50xER40-120	63	69.85
BT50xER25-165	42	69.85	BT50xER40-135	63	69.85
BT50xER32-70	50	69.85	BT50xER50-90	78	69.85
BT50xER32-80	50	69.85	BT50xER50-120	78	69.85