RETENTION KNOBS
RETENTION KNOB FEATURES Retention knobs come in many shapes and sizes. Many machining center manufacturers use different configurations on each of their models. Please provide us with the following information when ordering retention knobs: • Machining Center Taper Size (40, 50 taper etc.) and flange type (CAT or BT)
• Brand and model of machining center • Drawing of retention knob (if available)
CAT RETENTION KNOBS • Class 3A UNC Thread • Magnetic particle crack tested • Tensile and shear requirements per ISO and JIS standard • All locations that make contact with ground spindle mechanism components are ground or hard turned • Base of retention knob flange is ground to assure perpendicular alignment between retention knob and taper of toolholder • Tight pitch diameter tolerance helps maintain accurate concentricity between threads and retention knob limiting the expansion or flaring of the small end of the taper BT RETENTION KNOBS • Class 4g6g metric thread • Magnetic particle crack tested • Tensile and shear requirements per JIS 6339 • All locations of the retention knob that make contact with ground spindle mechanism components are ground or hard turned • Base of retention knob flange is ground to assure perpendicular alignment between retention knob and taper of toolholder • Ground Pilot and tight pitch diameter tolerance help maintain accurate concentricity between threads and retention knob limiting the expansion or flaring of the small end of the taper
Retention Knob Style
O-Ring Type
J
D
A
G
C
F
T
O-Ring in Groove
O-Ring in Taper
O-Ring in C-Bore
O-Ring on Face
JIS
DIN
ANSI
268
847-367-4800
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