Torque Specifications

We recommend using a tightening fixture and torque wrench to make sure cutting tools and retention knobs are properly tightened. Over-tightening can distort or even crack collets, causing runout problems and premature failure of the collet, nut, tool holder and cutting tool. Under-tightening can also cause poor cutting performance, or allow cutting tools to fly out of the spindle – a very serious safety hazard

Snap collet into nut.
Insert cutter into collet. Collets without counter bore require shank to extend to the bottom of the collet.
Hand tighten collet nut assembly into tool holder.
Insert tool holder assembly into tightening fixture and secure it.
Tighten collet nut to recommended torque using a torque wrench and adapter.

Tightening Specifications for Collets

COLLET	NUT TYPE	COLLETS I.D. OVER 1/16″ (2MM)	COLLETS I.D. UNDER 1/16″ (2MM)	ORDER TORQUE WRENCH ADAPTER
ER 16	slotted	42 ft/lbs	30 ft/lbs	04580-16
ER 16	hex	42 ft/lbs	30 ft/lbs	04601-16
ER 20	slotted	59 ft/lbs	24 ft/lbs	04580-20
ER 20	hex	59 ft/lbs	24 ft/lbs	04602-20
ER 25	slotted	77 ft/lbs	77 ft/lbs	04503-25
ER 25	mini nut	25 ft/lbs	25 ft/lbs	4587
ER 32	slotted	100 ft/lbs	100 ft/lbs	04604-32
ER 40	slotted	130 ft/lbs	130 ft/lbs	04605-40
SYOZ 25	hook	90 ft/lbs	90 ft/lbs	03690-25
TG 75	hook	90 ft/lbs	90 ft/lbs	04018-TWA
TG 100	hook	90 ft/lbs	90 ft/lbs	03690-25

Tightening Specifications for Retention Knobs

RETENTION KNOBS	WRENCH FLATS	DRIVE	TORQUE	ORDER SOCKET
BT 30 Taper	0.535″	1/4″	36 ft/lbs	PSS-30BT
ISO 30 Taper	0.535″	3/8″	36 ft/lbs	PSS-30ISO
Any 40 Taper	0.750″	3/8″	76 ft/lbs	PSS-40
BT 50 Taper	1.187″	1/2″	99 ft/lbs	PSS-50
CAT 50 Taper	1.250″	1/2″	99 ft/lbs	PSSC-50

Tightening Specifications for CAT 40 End Mill Holders

PART NO.	DESCRIPTION	TORQUE
22907	CAT40x1/8×2.375	4 ft/lbs
22907-5.00-RR	CAT40x1/8xRR	4 ft/lbs
22907-6	CAT40x1/8×6	4 ft/lbs
22909	CAT40x3/16×2.5	6 ft/lbs
22909-4.72-RR	CAT40x3/16xRR	6 ft/lbs
22909-6	CAT40x3/16×6	6 ft/lbs
22911	CAT40x1/4×3	6 ft/lbs
22911-1.75	CAT40x1/4×1.75	6 ft/lbs
22911-2.5	CAT40x1/4×2.5	6 ft/lbs
22911-2.5-FID	CAT40x1/4xFID	6 ft/lbs
22911-4.72-RR	CAT40x1/4xRR	6 ft/lbs
22911-6	CAT40x1/4×6	6 ft/lbs
22911-DIN	CAT40x1/4xDIN	6 ft/lbs
22913	CAT40x5/16×3	10 ft/lbs
22913-2.5	CAT40x5/16×2.5	10 ft/lbs
22913-4.72-RR	CAT40x5/16xRR	10 ft/lbs
22915	CAT40x3/8×3	15 ft/lbs
22915-1.75	CAT40x3/8×1.75	10 ft/lbs
22915-2.5	CAT40x3/8×2.5	15 ft/lbs
22915-2.5-FID	CAT40x3/8xFID	15 ft/lbs
22915-4.72-RR	CAT40x3/8xRR	15 ft/lbs
22915-5	CAT40x3/8×5	15 ft/lbs
22915-DIN	CAT40x3/8xDIN	15 ft/lbs
22916	CAT40x7/16×2.5	20 ft/lbs
22917	CAT40x1/2×3	20 ft/lbs
22917-1.75	CAT40x1/2×1.75	20 ft/lbs

22917-2.5	CAT40x1/2×2.5	20 ft/lbs
22917-2.5-FID	CAT40x1/2xFID	20 ft/lbs
22917-2.63	CAT40x1/2×2.63	20 ft/lbs
22917-4.72-RR	CAT40x1/2xRR	20 ft/lbs
22917-DIN	CAT40x1/2xDIN	20 ft/lbs
22918	CAT40x1/2×4.63	20 ft/lbs
22919	CAT40x5/8×3	35 ft/lbs
22919-1.75	CAT40x5/8×1.75	35 ft/lbs
22919-DIN	CAT40x5/8xDIN	35 ft/lbs
22920	CAT40x5/8×3.75	35 ft/lbs
22920-5.75	CAT40x5/8×5.75	35 ft/lbs
22921	CAT40x3/4×3.5	45 ft/lbs
22921-1.75	CAT40x3/4×1.75	45 ft/lbs
22921-3	CAT40x3/4×3	45 ft/lbs
22921-3-DIN	CAT40x3/4xDIN	45 ft/lbs
22921-3-FID	CAT40x3/4xFID	45 ft/lbs
22921-5	CAT40x3/4×5	45 ft/lbs
22923	CAT40x7/8×3.5	45 ft/lbs
22925	CAT40x1x4	70 ft/lbs
22925-1.75	CAT40x1x1.75	45 ft/lbs
22925-6	CAT40x1x6	70 ft/lbs
22925-DIN	CAT40x1xDIN	70 ft/lbs
22925-FID	CAT40x1xFID	70 ft/lbs
22927	CAT40x1-1/4×4.6	70 ft/lbs
22929	CAT40x1-1/2×4.5	70 ft/lbs

Tightening Specifications for CAT 50 End Mill Holders

PART NO.	DESCRIPTION	TORQUE
22931	CAT50x1/4×4	6 ft/lbs
22931-2 1/2	CAT50x1/4×2-1/2	6 ft/lbs
22933	CAT50x5/16×4	10 ft/lbs
22935	CAT50x3/8×4	15 ft/lbs
22935-2 1/2	CAT50x3/8×2-1/2	15 ft/lbs
22935-6	CAT50x3/8×6	15 ft/lbs
22935-DIN	CAT50x3/8xDIN	15 ft/lbs
22936-8	CAT50x3/8×8	15 ft/lbs
22937	CAT50x1/2×4	20 ft/lbs
22937-2 5/8	CAT50x1/2×2-5/8	20 ft/lbs
22937-6	CAT50x1/2×6	20 ft/lbs
22937-8	CAT50x1/2×8	20 ft/lbs
22937-DIN	CAT50x1/2xDIN	20 ft/lbs
22939	CAT50x5/8×4	35 ft/lbs
22939-1.44	CAT50x5/8×1.44	35 ft/lbs
22939-3	CAT50x5/8×3	35 ft/lbs
22939-6	CAT50x5/8×6	35 ft/lbs
22939-8	CAT50x5/8×8	35 ft/lbs
22941	CAT50x3/4×4	45 ft/lbs
22941-1.44	CAT50x3/4×1.44	45 ft/lbs


22941-3	CAT50x3/4×3	45 ft/lbs
22941-5.75	CAT50x3/4×5.75	45 ft/lbs
22941-6	CAT50x3/4×6	45 ft/lbs
22941-8	CAT50x3/4×8	45 ft/lbs
22941-DIN	CAT50x3/4xDIN	45 ft/lbs
22943	CAT50x7/8×4	45 ft/lbs
22945	CAT50x1x4	70 ft/lbs
22945-2.62	CAT50x1x2.62	70 ft/lbs
22945-6	CAT50x1x6	70 ft/lbs
22945-DIN	CAT50x1xDIN	70 ft/lbs
22946-8	CAT50x1x8	70 ft/lbs
22947	CAT50x1-1/4×4.6	70 ft/lbs
22947-2.62	CAT50x1-1/4×2.62	70 ft/lbs
22947-6	CAT50x1-1/4×6	70 ft/lbs
22947-8	CAT50x1-1/4×8	70 ft/lbs
22947-DIN	CAT50x1-1/4xDIN	70 ft/lbs
22949	CAT50x1-1/2×4.6	70 ft/lbs
22949-2	CAT50x1-1/2×2	70 ft/lbs
22949-DIN	CAT50x1-1/2xDIN	70 ft/lbs
22951	CAT50x2x6	125 ft/lbs

Tightening Specifications for BT End Mill Holders

BT 30 End Mill Holders

PART NO.	DESCRIPTION	TORQUE
07130-1/8	BT30x1/8	4 ft/lbs
07130-3/16	BT30x3/16	6 ft/lbs
07130-1/4	BT30x1/4	6 ft/lbs
07130-5/16	BT30x5/16	10 ft/lbs
07130-3/8	BT30x3/8	15 ft/lbs
07130-7/16	BT30X7/16	20 ft/lbs
07130-1/2	BT30x1/2	20 ft/lbs
07130-5/8	BT30x5/8	35 ft/lbs
07130-3/4	BT30x3/4	45 ft/lbs

BT 40 End Mill Holders

PART NO.	DESCRIPTION	TORQUE
07140-1/8	BT40x1/8	4 ft/lbs
07140-3/16	BT40x3/16	6 ft/lbs
07140-1/4	BT40x1/4	6 ft/lbs
07140-5/16	BT40x5/16	10 ft/lbs
07140-3/8	BT40x3/8	15 ft/lbs
07140-1/2	BT40x1/2	20 ft/lbs
07140-5/8	BT40x5/8	35 ft/lbs
07140-3/4	BT40x3/4	45 ft/lbs
07140-1	BT40x1	70 ft/lbs
07140-1 1/4	BT40x1-1/4	70 ft/lbs
07140-1 1/2	BT40x1-1/2	70 ft/lbs

BT 50 End Mill Holders

PART NO.	DESCRIPTION	TORQUE
07150-1/4	BT50x1/4	6 ft/lbs
07150-3/8	BT50x3/8	15 ft/lbs
07150-1/2	BT50x1/2	20 ft/lbs
07150-5/8	BT50x5/8	35 ft/lbs
07150-3/4	BT50x3/4	45 ft/lbs
07150-1	BT50x1	70 ft/lbs
07150-1-6	BT50x1x6	70 ft/lbs
07150-1-1/4	BT50x1-1/4	70 ft/lbs

Tightening Specifications for Milling Chucks

PART NO.	DESCRIPTION	TORQUE
23241	CAT40 3/4″ – 3.62″	45 ft/lbs
23242	CAT40 3/4″ – 4.13″	45 ft/lbs
23246	CAT40 1 1/4″ – 4.52″	45 ft/lbs
23252	CAT50 3/4″ – 4.13″	45 ft/lbs
23256	CAT50 1 1/4″ – 4.13″	45 ft/lbs
05990	BT40 3/4″ – 3.15″	45 ft/lbs
05991	BT40 1 1/4″ – 3.54″	45 ft/lbs

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