Pratt Burnerd/Atlas MK3 Series Self-Contained Air Power Chucks

MK4 3-Jaw Self-Contained Air Power Chucks & Accessories

Dimensional Data

Lever Control Unit - Part Number 1157-12800 Foot Pedal Control Unit - Part Number 1157-12801 (Not Shown) This unit is essential in order to operate MK3 Self-Contained Power Chucks. It is designed to be interlocked with the machine spindle so that the chuck cannot be actuated while the spindle is under power. Care must be taken not to actuate the chuck while the spindle is decelerating. Units are supplied complete with pressure gage, pressure regulator, oil mist lubricator, air filter and lines with fittings. Unit is operated by air and 110 volt/60 cycle (24 volt DC on request).

Top Jaws for MK3 Self-Contained Chucks — 1/16" x 90º Serrations
Type 611 - Hardened and ground reversible jaws with serrated gripping faces. (Supplied in sets of 3 for 3 jaw chucks only) Type 612 - Soft blank jaws, case hardening quality steel. (Supplied as single units only)
Chuck Size	Jaw Type	Part Number	A	B	C	D	F	Bolt Size	Step Height
6-1⁄2"	611	8130-17611	2.56"	1.56"	1.18"	.475"	.67"	M8	.39"
6-1⁄2"	612	8140-17512	2.75"	1.50"	1.25"	.475"	.787"	M8	-
8"/10"	611	8130-21611	3.00"	1.97"	1.57"	.670"	.75"	M12	.47"
8"/10"	612	2860-21512	3.50"	2.00"	1.50"	.670"	1.00"	M12	-
12"/14"	611	8130-31611	4.92"	"2.36"	2.36"	.830"	1.25"	M16	.55"
12"/14"	612	2860-32512	4.50"	2.50"	2.00"	.830"	1.25"	M16	-