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Belgaum, India

Toolings Pvt. Ltd.

Precision Tooling Since 1985

Shank standard

CAT shank

BT SK / ISO CAT HSK DIN 2080

StandardsANSI / ASME B5.50ISO 7388-1 (Shank U)

Cone tolerance AT3Original catalogue page (p. 10)

CAT shank

Drawing

Shown here: CAT40 FORM A

CAT shank

Dimensions

All dimensions in INCH

CAT shank dimensions, sizes 30 to 50
CAT	30	40	45	50
D	1.250	1.750	2.250	2.750
L±0.005	1.875	2.687	3.250	4.000
d1+0.015	0.516	0.641	0.766	1.031
GUNC-2B	0.500-13	0.625-11	0.750-10	1.000-8
D1±0.002	1.812	2.500	3.250	3.875
D2±0.005	1.250	1.750	2.250	2.750
t-0.015	0.640	0.890	1.140	1.390
t1-0.015	0.735	0.985	1.235	1.485
b±0.010	0.645	0.645	0.770	1.020

CAT shank dimensions, sizes 30 to 50
CAT	D	L	d1	G	D1	D2	t	t1	b
CAT	D	±0.005	+0.015	UNC-2B	±0.002	±0.005	-0.015	-0.015	±0.010
30	1.250	1.875	0.516	0.500-13	1.812	1.250	0.640	0.735	0.645
40	1.750	2.687	0.641	0.625-11	2.500	1.750	0.890	0.985	0.645
45	2.250	3.250	0.766	0.750-10	3.250	2.250	1.140	1.235	0.770
50	2.750	4.000	1.031	1.000-8	3.875	2.750	1.390	1.485	1.020

CAT shank

Coolant forms

TYPE UDCoolant thru centre

Taper accuracy

Cone tolerance AT3

Standards: ISO 1947- 1973 | IS 7615- 2003

Cone tolerance AT3: generating angle limits
CATNo.	'α' Basic	Tolerance Grade AT3
		Generating Angle Limits α/2		AT α/2Secs	AT α/2μ Rads	L	ATD(D1~D2)
		Min	Max	AT α/2Secs	AT α/2μ Rads	L	ATD(D1~D2)
30	16°35'39.4"	8°17'51.2"	8°17'57.7"	6.5	31.5	42	0.0026
35		8°17'52.7"	8°17'57.7"	5	31.5	53	0.0033
40		8°17'51.2"	8°17'56.2"	5	20	59	0.0024
45		8°17'52.2"	8°17'56.2"	4	15.75	74	0.0030
50		8°17'50.7"	8°17'54.7"	4	15.75	92	0.0029

Cone tolerance AT3

Material & heat treatment

Material: Carburizing Alloy Steel
Heat Treatment: Surface Hardness HRc 58±2Case Depth 0.6-1.0 mm @ HV1 550Tensile Strength 1000 MPa Minimum