HSK tool holders are a relatively new design and is an acronym for ‘Hollow Taper Shank’ They do not have retention knobs like steep taper tool holders but instead have a hollow shank. HSK tool holders offer better repeatability, accuracy and faster tool changing and are mainly used in high – speed machining. Higher clamping force is generated due to simultaneous taper and flange contact and can be used for machining at spindle speeds higher than 8000 rpm. Falcon’s HSK tooling range includes HSK-A50, A63, A100; HSK-B63, B-80, B-100; HSK-C50, C63, C100; HSK-E50, E63, HSK-F63 and HSK-A80 as well.

HSK Form A

Standard type for use on milling machines and machining centres with automatic tool change. Also suitable for manual tool change.

HSK - d	b1 ±0.04	b2 H10	b3 H10	d2.	d5	d9 max	d10 -0.1	d11 -0.1	d15	f1 -0.1	f2 min	f3 ±0.1	h1 -0.2	h3 +0.2	l1 -0.2	l5 JS10
50	10.54	12	14	38.009	32	40	43	59.3	M16X1	26	42	18	21	5.1	25	14.13
63	12.54	16	18	48.01	40	50	55	72.3	M18X1	26	42	18	26.5	5	32	18.13
100	20.02	20	22	75.013	63	80	92	109.75	M24X1.5	29	45	20	44	4.9	50	28.56

HSK Form B

Coolant supply through the flange Enlarged flange diameter for rigidity Drive slots are in the flange

For use on milling machines and lathes Machining centres with automatic tool change.

HSK - d	b1 ±0.04	b2 H10	b3 H10	d2.	d5	d9 max	d10 -0.1	d11 -0.1	d13	d6 max	f1 -0.1	f2 min	f3 ±0.1	h1 -0.2	h3 +0.2	l1 -0.2	l5 JS10	l9 -0.2
63	10.54	16	18	38.009	25.5	53	55	72.3	25	6.8	26	42	18	25	5	25	14.13	25
80	12.54	18	20	48.01	32	68	70	88.8	32	8.4	26	42	18	31.5	4.9	32	18.13	32
125	20.02	25	28	75.013	50	111	117	134.75	50	12	29	45	20	50	4.8	50	28.56	50

HSK Form C

Manual tool change type only For use as a modular system For special purpose machines For transfer lines and lathes.

HSK - d	b1 ±0.04	d2.	d5	l1 -0.2	l5 JS10	f5
50	10.54	38.009	40	25	14.13	12.5
63	12.54	48.01	32	32	18.13	12.5
100	20.02	75.013	63	50	28.56	16

HSK Form E

High speed applications for automatic tool change.
Option coolant fitting as form ‘A’
Note: No rear drive slots, no slots or notches in the flange.

HSK - d	d2.	d5 H11	d9 max	d10 -0.1	d11 -0.1	d15 max	f1 -0.1	f2 min	f3 ±0.1	l1 -0.2	l5 JS10
50	38.009	32	40	43	59.3	6.8	26	42	18	25	14.13
63	48.01	40	50	55	72.3	8.4	26	42	18	32	18.13

HSK Form F

High speed applications
Enlarged flange diameter for rigidity
No drive slots Symmetrical design
For use on machines with automatic tool change

HSK - d	d2.	d5	d9 max	d10 -0.1	d11 -0.1	f1 -0.1	f2 min	f3 ±0.1	l1 -0.2	l5 JS10
63	38.009	32	50	55	72.3	26	42	18	25	14.13

Balancing G2.5@25000 RPM

Shank Detail

Machine Design

HSK Form A

HSK Form B

HSK Form C

HSK Form E

HSK Form F

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