Pratt Burnerd/Atlas 4-jaw Self Centering Steel Body Chucks

4-Jaw Universal Self-Centering Steel Body Chucks

Series 743 Sizes 6" thru 24"

One-year warranty
Sizes 6" thru 24"
Chucks can be supplied with thru holes from front of chuck for mounting on rotary tables or centers
Maximum .003" TIR using nominating pinion
.001" Repeatability using nominating pinion
Two-piece American Standard tongue and groove jaws
Nitride hardened and ground scroll
Hardened pinions
Steel body
Can be used for either two jaw or four jaw concentric, self-centering chucking
Larger sizes available on request
Sizes 20" and 24" chucks also available in iron body on request

4-Jaw Universal Steel Body Chucks
Chuck Size	Flatback Chuck No.	Camlock Type D Spindle		Type L Spindle		Type A Spindle		Threaded Type Spindle
		Size	Chuck No.	Size	Chuck No.	Size	Chuck No.	Size	Chuck No.
6"	0673-2000	D-3	0673-20D3	L-00	0673-2L00	A-4	0673-20A4	1-1/2 - 8	0673-2041
6"		D-4	0673-20D4	L-0	0673-20L0	A-5	0673-20A5	1-3/4 - 8	0673-2042
6"								2-1/4 - 8	0673-2043
6"								2-3/8 - 6	0673-2046
8"	0873-2000	D-4	0873-20D4	L-00	0873-2L00	A-5	0873-20A5	2-1/4 - 8	0873-2043
8"		D-5	0873-20D5	L-0	0873-20L0	A-6	0873-20A6	2-3/8 - 6	0873-2046
8"		D-6	0873-20D6
10"	1073-2000	D-5	1073-20D5	L-0	1073-20L0	A-5	1073-20A5	2-1/4 - 8	1073-2043
10"		D-6	1073-20D6	L-1	1073-20L1	A-6	1073-20A6	2-3/8 - 6	1073-2046
10"		D-8	1073-20D8			A-8	1073-20A8
12"	1273-2000	D-6	1273-20D6	L-0	1273-20L0	A-6	1273-20A6
12"		D-8	1273-20D8	L-1	1273-20L1	A-8	1273-20A8
12"		D-11	1273-2D11	L-2	1273-20L2
16"	1673-2000	D-6	1673-20D6	L-1	1673-20L1	A-8	1673-20A8
16"		D-8	1673-20D8	L-2	1673-20L2	A-11	1673-2A11
16"		D-11	1673-2D11
20"	2073-2000	D-8	2073-20D8	L-1	2073-20L1	A-8	2073-20A8
20"		D-11	2073-2D11	L-2	2073-20L2	A-11	2073-2A11
24"	2473-2000	D-8	2473-20D8	L-2	2473-20L2	A-8	2473-20A8
24"		D-11	2473-2D11			A-11	2473-2A11

Dimensional Information

Dimensional Data for Universal Flatback Mounting Chucks with Two-Piece Jaws

Chuck Dia.	B1	B3	B4	B5	B6	B7	B15	J10
6-1⁄4"	6.3"	4.921"	1.65"	.157"	5.51"	3xM10	2.56"	1.64"
8"	7.9"	6.299"	2.16"	.157"	6.92"	3xM10	2.95"	1.69"
10"	9.8"	7.952"	3.15"	.165"	8.74"	3xM12	3.26"	2.11"
12"	12.4"	10.157"	3.74"	.196"	11.18"	3xM14	4.13"	2.12"
16"	15.8"	12.598"	5.11"	.196"	14.25"	3xM16	5.55	2.44"
20"	19.6"	15.748"	6.49"	.236"	18.03"	3xM16	4.17"	2.93"
24"	23.6"	21.456"	8.07"	.275"	23.07"	3xM16	5.51"	2.93"

Note: Dimensions are for flatback chucks; on A, L or D mounted chucks dimension B15 will vary.
(1) Model No. 2033-2A11 and 2433-2A11 have a 6.5 thru-hole.