Tool Holder Torque Specifications

torque wrench and tightening stand

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.

ER collet chuck

Collet Chuck Tightening Directions

  • 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.

Related Links:
Adjustable Torque Wrenches
Collet Key Adapters, Retention Knob Drives,
and Fixed Head Drives

Recommended 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

Recommended 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

 

Recommended Tightening Specifications for CAT 40 End Mill Holders

Part No.
Description
Torque
22907
CAT40x1/8x2.375
4 ft/lbs
22907-5.00-RR
CAT40x1/8xRR
4 ft/lbs
22907-6
CAT40x1/8x6
4 ft/lbs
22909
CAT40x3/16x2.5
6 ft/lbs
22909-4.72-RR
CAT40x3/16xRR
6 ft/lbs
22909-6
CAT40x3/16x6
6 ft/lbs
22911
CAT40x1/4x3
6 ft/lbs
22911-1.75
CAT40x1/4x1.75
6 ft/lbs
22911-2.5
CAT40x1/4x2.5
6 ft/lbs
22911-2.5-FID
CAT40x1/4xFID
6 ft/lbs
22911-4.72-RR
CAT40x1/4xRR
6 ft/lbs
22911-6
CAT40x1/4x6
6 ft/lbs
22911-DIN
CAT40x1/4xDIN
6 ft/lbs
22913
CAT40x5/16x3
10 ft/lbs
22913-2.5
CAT40x5/16x2.5
10 ft/lbs
22913-4.72-RR
CAT40x5/16xRR
10 ft/lbs
22915
CAT40x3/8x3
15 ft/lbs
22915-1.75
CAT40x3/8x1.75
10 ft/lbs
22915-2.5
CAT40x3/8x2.5
15 ft/lbs
22915-2.5-FID
CAT40x3/8xFID
15 ft/lbs
22915-4.72-RR
CAT40x3/8xRR
15 ft/lbs
22915-5
CAT40x3/8x5
15 ft/lbs
22915-DIN
CAT40x3/8xDIN
15 ft/lbs
22916
CAT40x7/16x2.5
20 ft/lbs
22917
CAT40x1/2x3
20 ft/lbs
22917-1.75
CAT40x1/2x1.75
20 ft/lbs
Part No.
Description
Torque
22917-2.5
CAT40x1/2x2.5
20 ft/lbs
22917-2.5-FID
CAT40x1/2xFID
20 ft/lbs
22917-2.63
CAT40x1/2x2.63
20 ft/lbs
22917-4.72-RR
CAT40x1/2xRR
20 ft/lbs
22917-DIN
CAT40x1/2xDIN
20 ft/lbs
22918
CAT40x1/2x4.63
20 ft/lbs
22919
CAT40x5/8x3
35 ft/lbs
22919-1.75
CAT40x5/8x1.75
35 ft/lbs
22919-DIN
CAT40x5/8xDIN
35 ft/lbs
22920
CAT40x5/8x3.75
35 ft/lbs
22920-5.75
CAT40x5/8x5.75
35 ft/lbs
22921
CAT40x3/4x3.5
45 ft/lbs
22921-1.75
CAT40x3/4x1.75
45 ft/lbs
22921-3
CAT40x3/4x3
45 ft/lbs
22921-3-DIN
CAT40x3/4xDIN
45 ft/lbs
22921-3-FID
CAT40x3/4xFID
45 ft/lbs
22921-5
CAT40x3/4x5
45 ft/lbs
22923
CAT40x7/8x3.5
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
CAT40x1-1/4x4.6
70 ft/lbs
22929
CAT40x1-1/2x4.5
70 ft/lbs

 

Recommended Tightening Specifications for CAT 50 End Mill Holders

Part No.
Description
Torque
22931
CAT50x1/4x4
6 ft/lbs
22931-2 1/2
CAT50x1/4x2-1/2
6 ft/lbs
22933
CAT50x5/16x4
10 ft/lbs
22935
CAT50x3/8x4
15 ft/lbs
22935-2 1/2
CAT50x3/8x2-1/2
15 ft/lbs
22935-6
CAT50x3/8x6
15 ft/lbs
22935-DIN
CAT50x3/8xDIN
15 ft/lbs
22936-8
CAT50x3/8x8
15 ft/lbs
22937
CAT50x1/2x4
20 ft/lbs
22937-2 5/8
CAT50x1/2x2-5/8
20 ft/lbs
22937-6
CAT50x1/2x6
20 ft/lbs
22937-8
CAT50x1/2x8
20 ft/lbs
22937-DIN
CAT50x1/2xDIN
20 ft/lbs
22939
CAT50x5/8x4
35 ft/lbs
22939-1.44
CAT50x5/8x1.44
35 ft/lbs
22939-3
CAT50x5/8x3
35 ft/lbs
22939-6
CAT50x5/8x6
35 ft/lbs
22939-8
CAT50x5/8x8
35 ft/lbs
22941
CAT50x3/4x4
45 ft/lbs
22941-1.44
CAT50x3/4x1.44
45 ft/lbs
Part No.
Description
Torque
22941-3
CAT50x3/4x3
45 ft/lbs
22941-5.75
CAT50x3/4x5.75
45 ft/lbs
22941-6
CAT50x3/4x6
45 ft/lbs
22941-8
CAT50x3/4x8
45 ft/lbs
22941-DIN
CAT50x3/4xDIN
45 ft/lbs
22943
CAT50x7/8x4
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
CAT50x1-1/4x4.6
70 ft/lbs
22947-2.62
CAT50x1-1/4x2.62
70 ft/lbs
22947-6
CAT50x1-1/4x6
70 ft/lbs
22947-8
CAT50x1-1/4x8
70 ft/lbs
22947-DIN
CAT50x1-1/4xDIN
70 ft/lbs
22949
CAT50x1-1/2x4.6
70 ft/lbs
22949-2
CAT50x1-1/2x2
70 ft/lbs
22949-DIN
CAT50x1-1/2xDIN
70 ft/lbs
22951
CAT50x2x6
125 ft/lbs

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

CAT and BT 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