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Pull Stud (Retention Knobs)

Pull studs (also called retention knobs) are the link between the machine drawbar and the toolholder. Pulling forces can reach 3000 daN on SA 50 spindles, making the superior material and hardening quality of EPB pull studs important.
Precision machining guarantees precise positioning and safe locking of the holder in the spindle. Most machines require a standard pull stud design (DIN, ISO, BT, CAT) and some require a specific design.

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Type:	BT DIN69872 NT ISO CAT JIS B6339 Mazak ISO7388
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Model: BT SK NT CAT ISO JIS
Brand: XZH
Code: 8466100000
Material: Alloy steel
Usage: Machine tools collet chuck tool holder clamping accessories
Production name: pull studs
Brand Name: XZH

BT Pull Stud

Specification

Material : Alloy steel

Hardness: HRC44-58

Order Example :PBT3045/PTB4060

Type :with Coolant through or without

Pull Stud

Model	D	D1	D2	M	L	L1	L2	H	H1	H1
BT30	12.5	7	11	M12	42	23	18	5	2.5	45
BT40	17	10	15	M16	60	35	28	6	3	60
BT50	25	17	23	M24	85	42	35	10	5	90

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Model	M	d1	d2	d3	d4	L3	L2	L1
NT30	M12	11	10	13	7	13.6	25.1	41
NT40	M16	25	21.2	17	7	13.6	25.1	53
NT50	M24	39.6	32	25	7	13.3	25.1	65.1

Model	M	d1	d2	d3	d4	L3	L2	L1
NT30	M12	11	10	13	7	13.6	25.1	41
NT40	M16	25	21.2	17	7	13.6	25.1	53
NT50	M24	39.6	32	25	7	13.3	25.1	65.1

Model	G	θ	L	B	C	E	F
CAT30A	5/8"-11	45	1.5	0.74	0.64	0.44	0.49
CAT50A	1"-8	45	2.3	1.14	1	0.7	0.82
CAT40B	5/8"-11	45/60/90	2.13	0.59	1.27	0.99	0.393
CAT50B	1"-8	45/60/90	3.07	0.906	1.772	1.378	0.669

Model	G	θ	L	B	C	E	F
CAT30A	5/8"-11	45	1.5	0.74	0.64	0.44	0.49
CAT50A	1"-8	45	2.3	1.14	1	0.7	0.82
CAT40B	5/8"-11	45/60/90	2.13	0.59	1.27	0.99	0.393
CAT50B	1"-8	45/60/90	3.07	0.906	1.772	1.378	0.669

Pull Stud (Retention Knobs)

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Model	D	D1	D2	M	L	L1	L2
SK30A(B)	13	9	13	M12	44	24	19
SK40A(B)	17	14	19	M16	54	26	20
SK50A(B)	25	21	28	M24	74	34	25