ISO 7388-3 Retention Knobs

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Machine Taper Number

CAT 40

CAT 50

System of Measurement

Grip Angle

Thread Size

Head Diameter

Manufacturer Model Number

Head-to-Flange Length

Projection

Shank Type

Collar Diameter

For Use With

Flange Thickness

REACH

Specifications Met

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Maximum Torque

RoHS

Export Control Classification Number (ECCN)

EAR99

Torque

44 ft·lbf to 59 ft·lbf

85 ft·lbf to 110 ft·lbf

DFARS Specialty Metals

Exempt

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11 Products

Retention Knobs


Knob with Coolant Hole	Knob


Knob with Coolant Hole	Knob

Attach tool holders such as collet chucks and end mill holders to your CNC machine’s spindle. For proper operation, choose a knob that exactly matches your collet type and spindle dimensions. All meet industrial standards for tensile and shear strength. These knobs are also known as pull studs.

Coolant Hole—Knobs with a coolant hole let coolant flow through to protect your tools and workpiece.

								Torque Range, ft·lbf
	Grip Angle	Projection	Head Dia.	Collar Dia.	Head-to-Flange Lg.	Flange Thk.	ID	Min.	Max.	Material	Features	Mfr.	Mfr. Model No.	Specs. Met	JIS Specification		Each
CAT 40 Machine Taper







				5/8"-11

				15°	1.03"	0.748"	0.512"	0.793"	0.28"	0.276"	44	59	Steel	Coolant Hole	Lyndex Nikken	C40-1500	ISO 7388-3	JIS B 6339	4403N11	000000


				15°	1.03"	0.748"	0.641"	0.793"	0.28"	0.276"	44	59	Steel	O-Ring, Coolant Hole	Lyndex Nikken	C40-1500(R)	ISO 7388-3	JIS B 6339	4403N12	00000
				15°	1.03"	0.748"	0.641"	0.793"	0.28"	0.276"	44	59	Steel	O-Ring, Coolant Hole	Lyndex Nikken	C40-1500-MORI	ISO 7388-3	JIS B 6339	4403N13	00000
				30°	1.266"	0.591"	0.512"	0.99"	0.24"	—	44	59	Steel	—	Lyndex Nikken	C40S-6000	ISO 7388-3	JIS B 6339	4403N21	00000
				45°	0.64"	0.74"	0.512"	0.433"	0.12"	0.276"	44	59	Steel	Coolant Hole	Lyndex Nikken	C40-STD	ISO 7388-3	JIS B 6339	4403N24	00000
				45°	0.64"	0.74"	0.641"	0.44"	0.12"	0.157"	Not Rated	Not Rated	Steel	O-Ring, Coolant Hole	Lyndex Nikken	PS-B64-1	ISO 7388-3	JIS B 6339	4403N25	00000
				45°	1.266"	0.591"	0.512"	0.99"	0.24"	—	44	59	Steel	—	Lyndex Nikken	C40S-4500	ISO 7388-3	JIS B 6339	4403N16	00000
				45°	1.266"	0.591"	0.512"	0.99"	0.24"	0.177"	44	59	Steel	Coolant Hole	Lyndex Nikken	C40S-4500(H)	ISO 7388-3	JIS B 6339	4403N17	00000


				CAT 50 Machine Taper







								1"-8

								30°	1.772"	0.906"	1.024"	1.378"	0.39"	0.236"	85	110	Steel	O-Ring, Coolant Hole	Lyndex Nikken	PS-B61	ISO 7388-3	JIS B 6339	4403N39	00000


								45°	1"	1.142"	0.768"	0.701"	0.2"	0.461"	85	110	Steel	Coolant Hole	Lyndex Nikken	C50-STD	ISO 7388-3	JIS B 6339	4403N35	00000
								45°	1.78"	0.906"	0.827"	1.386"	0.39"	0.236"	85	110	Steel	Coolant Hole	Lyndex Nikken	C50-4500(H)	ISO 7388-3	JIS B 6339	4403N29	00000