Page 110 - Parlec Catalog
P. 110
Retention Knobs
108 Production Toolholding Solutions
RETENTION KNOBS
Parlec offers retention knobs for over 100 styles of machine tools.
Material, heat treat, and dimensions are to ANSI specifications.
Manufactured using alloy steel.
Case hardened to ensure long service life.
Core is tempered for tough shock resistance.
WARNING: Machine tool manufacturers have used many various styles and sizes of retention knobs. They
often look very similar and appear to be interchangeable. The use of the incorrect knob, or the incorrect use
of a knob, may result in injury or property damage. It is the responsibility of the end user to check that the
supplied knobs are correct for the machine tool and taper type. It is very important not to intermix metric
retention knobs with inch toolholders. Be sure to fully tighten the retention knob. Failure to do so may result
in the toolholder coming loose during operation.
The use of sealing and thread lock is recommended. Overtightening may cause a toolholder taper
deformation.
B
B
Angle
B Angle
C F C E F
E
C Angle
E F
OAL OAL
OAL
Thread Thread
Thread
ANSI/ISO DIN BT MAS
ANSI/ISO RETENTION KNOBS - INCH
Taper Size Part Number Thread Angle OAL B C E F Coolant Hole Specification/Feature
40NTRK 5/8-11 45 1.68 0.7 0.64 0.44 0.49 - ANSI STD Solid
40 Taper
40TRK 5/8-11 45 1.68 0.74" 0.64 0.44 0.49 0.281 ANSI STD
50NTRK 1-8 45 2.54 1.14 1 0.7 0.82 - ANSI STD Solid
50TRK 1-8 45 2.54 1.14 1 0.7 0.82 0.468 ANSI STD
50 Taper 50TRK-390-P 1-8 45 2.54" 1.14" 1.00" 0.70" 0.82" 0.390" ANSI STD
50TRK-500 1-8 45 2.54" 1.14" 1.00" 0.70" 0.82" 0.500" ANSI STD
M50TRK 1-8 45 2.3 1.14 1 0.7 0.82 0.468 MAZAK O-Ring Seal Groove
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