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Chip-Breaker Bushings (CH)

Drill Bushings

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Product Information

Chip-Breaker Bushings (CH)

Similar to an SF renewable bushing, but with specially designed chip-breaking notches on the drill-exit end. Use to break up chips from tough, stringy materials, to reduce friction and heat buildup. Reduces bushing wear at the drill-exit end and reduces the chance of tool or workpiece damage. A chip-breaker bushing should extend beyond its liner to allow chips to escape. Chip breakers are also available on other bushing types such as P, H, and DC (directed coolant).

All chip-breaker bushings are manufactured to order. To order a specific bushing, select the basic part number below and add the desired ID drill size (as a 4-place decimal inch). See Technical Information tab for Standard Drill Sizes. Long bushings with ID sizes marked * are counterbored according to ANSI standards for proper drill-bearing length.

Example part numbers:

CH-20-16-.1250 SF-type bushing with chip breaker (1/8" ID)

CH-20-16-.1772 SF-type bushing with chip breaker (4.50mm ID)

PCH-20-16-.1250 P-type bushing with chip breaker (1/8" ID)

HCH-20-16-.1250 H-type bushing with chip breaker (1/8" ID )

DCCH-20-16-.1250 Directed-coolant bushing with chip breaker (1/8" ID)

Technical Information

Click here for Standard Drill Sizes

Application Information

Chip-Breaker Bushings have specially designed chip-breaking notches on the drill-exit end.

ID Tolerance

Standard ID Tolerance:

From #80 to 1/4" +.0001/+.0004

Over 1/4 to 3/4" +.0001/+.0005

Over 3/4 to 1-1/2" +.0002/+.0006

Over 1-1/2 to 2-3/4" +.0003/+.0007

OD Tolerance

Standard OD Tolerance:

3/16 to 1" 0/-.0002

1-3/8 to 1-3/4" 0/-.0003

2-1/4 to 5" 0/-.0004

No-Counterbore Option on Long Bushings*

Extremely long bushings with a small ID size (marked with an asterisk * in the tables below) are counterbored according to ANSI standards for proper drill-bearing length to eliminate binding and heat buildup. Add "-NCB" for applications that require these bushings without a counterbore:

CH-20-16-.1250-NCB (Special)

Material

MATERIAL	HEAT TREAT	FINISH	DFARS	RoHS
1144 Stressproof Steel	heat treated to achieve Rc 62-64 ID hardness	-	✔	✔

Click here for detailed material and finish specifications.

California residents click here for Prop 65 information.

Other materials are available by special order

Chip-Breaker Bushings (CH)

CH bushings with a standard ID drill size can be ordered online. To order a specific standard bushing, select the basic part number below and add the desired ID size (as a 4-place decimal inch) on the Price & Availability screen. Example: CH-20-12-.0625 (CH-20-12 with .0625" ID)

5/16" OD

QUANTITY	BASIC PART NO.	AVAILABLE ID SIZES	STANDARD DRILL SIZES	OD	LENGTH	F DIA	G	H	J	L	M	N DIA	R	LOCK SCREW
	CH-20-12	.0625-.0934*	1/16-5/64, #52-#43, 1.60-2.35mm	5/16	3/4	35/64	1/4	1/8	11/64	65°	5/8	5/8	1/2	LS-1 RC-01 RK-01 RK-11
	CH-20-16	.0625-.0934*	1/16-5/64, #52-#43, 1.60-2.35mm	5/16	1	35/64	1/4	1/8	11/64	65°	5/8	5/8	1/2	LS-1 RC-01 RK-01 RK-11
	CH-20-22	.0625-.0934*	1/16-5/64, #52-#43, 1.60-2.35mm	5/16	1-3/8	35/64	1/4	1/8	11/64	65°	5/8	5/8	1/2	LS-1 RC-01 RK-01 RK-11
	CH-20-12	.0935-.1935*	3/32-3/16, #42-#10, 2.40-4.90mm	5/16	3/4	35/64	1/4	1/8	11/64	65°	5/8	5/8	1/2	LS-1 RC-01 RK-01 RK-11
	CH-20-16	.0935-.1935*	3/32-3/16, #42-#10, 2.40-4.90mm	5/16	1	35/64	1/4	1/8	11/64	65°	5/8	5/8	1/2	LS-1 RC-01 RK-01 RK-11
	CH-20-22	.0935-.1935*	3/32-3/16, #42-#10, 2.40-4.90mm	5/16	1-3/8	35/64	1/4	1/8	11/64	65°	5/8	5/8	1/2	LS-1 RC-01 RK-01 RK-11

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1/2" OD

QUANTITY	BASIC PART NO.	AVAILABLE ID SIZES	STANDARD DRILL SIZES	OD	LENGTH	F DIA	G	H	J	L	M	N DIA	R	LOCK SCREW
	CH-32-12	.1405-.3438*	9/64-11/32, #28-R, 3.60-8.70mm	1/2	3/4	51/64	1/4	1/8	19/64	65°	3/4	7/8	5/8	LS-1 RC-01 RK-01 RK-11
	CH-32-16	.1405-.3438*	9/64-11/32, #28-R, 3.60-8.70mm	1/2	1	51/64	1/4	1/8	19/64	65°	3/4	7/8	5/8	LS-1 RC-01 RK-01 RK-11
	CH-32-22	.1405-.3438*	9/64-11/32, #28-R, 3.60-8.70mm	1/2	1-3/8	51/64	1/4	1/8	19/64	65°	3/4	7/8	5/8	LS-1 RC-01 RK-01 RK-11
	CH-32-28	.1405-.3438*	9/64-11/32, #28-R, 3.60-8.70mm	1/2	1-3/4	51/64	1/4	1/8	19/64	65°	3/4	7/8	5/8	LS-1 RC-01 RK-01 RK-11
	CH-32-34	.1405-.3438*	9/64-11/32, #28-R, 3.60-8.70mm	1/2	2-1/8	51/64	1/4	1/8	19/64	65°	3/4	7/8	5/8	LS-1 RC-01 RK-01 RK-11

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3/4" OD

QUANTITY	BASIC PART NO.	AVAILABLE ID SIZES	STANDARD DRILL SIZES	OD	LENGTH	F DIA	G	H	J	L	M	N DIA	R	LOCK SCREW
	CH-48-16	.2812-.5625	9/32-9/16, L-Z, 7.20-14.00mm	3/4	1	1-3/64	1/4	1/8	27/64	50°	7/8	1-1/8	3/4	LS-1 RC-01 RK-01 RK-11
	CH-48-22	.2812-.5625	9/32-9/16, L-Z, 7.20-14.00mm	3/4	1-3/8	1-3/64	1/4	1/8	27/64	50°	7/8	1-1/8	3/4	LS-1 RC-01 RK-01 RK-11
	CH-48-28	.2812-.5625	9/32-9/16, L-Z, 7.20-14.00mm	3/4	1-3/4	1-3/64	1/4	1/8	27/64	50°	7/8	1-1/8	3/4	LS-1 RC-01 RK-01 RK-11
	CH-48-34	.2812-.5625	9/32-9/16, L-Z, 7.20-14.00mm	3/4	2-1/8	1-3/64	1/4	1/8	27/64	50°	7/8	1-1/8	3/4	LS-1 RC-01 RK-01 RK-11
	CH-48-40	.2812-.5625*	9/32-9/16, L-Z, 7.20-14.00mm	3/4	2-1/2	1-3/64	1/4	1/8	27/64	50°	7/8	1-1/8	3/4	LS-1 RC-01 RK-01 RK-11

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1" OD

QUANTITY	BASIC PART NO.	AVAILABLE ID SIZES	STANDARD DRILL SIZES	OD	LENGTH	F DIA	G	H	J	L	M	N DIA	R	LOCK SCREW
	CH-64-16	.4688-.7812	15/32-25/32, 11.50-19.50mm	1	1	1-27/64	3/8	3/16	19/32	35°	1-7/64	1-1/2	59/64	LS-2 RC-02 RK-02 RK-12
	CH-64-22	.4688-.7812	15/32-25/32, 11.50-19.50mm	1	1-3/8	1-27/64	3/8	3/16	19/32	35°	1-7/64	1-1/2	59/64	LS-2 RC-02 RK-02 RK-12
	CH-64-28	.4688-.7812	15/32-25/32, 11.50-19.50mm	1	1-3/4	1-27/64	3/8	3/16	19/32	35°	1-7/64	1-1/2	59/64	LS-2 RC-02 RK-02 RK-12
	CH-64-34	.4688-.7812	15/32-25/32, 11.50-19.50mm	1	2-1/8	1-27/64	3/8	3/16	19/32	35°	1-7/64	1-1/2	59/64	LS-2 RC-02 RK-02 RK-12
	CH-64-40	.4688-.7812	15/32-25/32, 11.50-19.50mm	1	2-1/2	1-27/64	3/8	3/16	19/32	35°	1-7/64	1-1/2	59/64	LS-2 RC-02 RK-02 RK-12
	CH-64-48	.4688-.7812	15/32-25/32, 11.50-19.50mm	1	3	1-27/64	3/8	3/16	19/32	35°	1-7/64	1-1/2	59/64	LS-2 RC-02 RK-02 RK-12

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1-3/8" OD

QUANTITY	BASIC PART NO.	AVAILABLE ID SIZES	STANDARD DRILL SIZES	OD	LENGTH	F DIA	G	H	J	L	M	N DIA	R	LOCK SCREW
	CH-88-16	.7188-1.0625	23/32-1-1/16, 18.50-27.00mm	1-3/8	1	1-51/64	3/8	3/16	25/32	30°	1-19/64	1-7/8	1-7/64	LS-2 RC-02 RK-02 RK-12
	CH-88-22	.7188-1.0625	23/32-1-1/16, 18.50-27.00mm	1-3/8	1-3/8	1-51/64	3/8	3/16	25/32	30°	1-19/64	1-7/8	1-7/64	LS-2 RC-02 RK-02 RK-12
	CH-88-28	.7188-1.0625	23/32-1-1/16, 18.50-27.00mm	1-3/8	1-3/4	1-51/64	3/8	3/16	25/32	30°	1-19/64	1-7/8	1-7/64	LS-2 RC-02 RK-02 RK-12
	CH-88-34	.7188-1.0625	23/32-1-1/16, 18.50-27.00mm	1-3/8	2-1/8	1-51/64	3/8	3/16	25/32	30°	1-19/64	1-7/8	1-7/64	LS-2 RC-02 RK-02 RK-12
	CH-88-40	.7188-1.0625	23/32-1-1/16, 18.50-27.00mm	1-3/8	2-1/2	1-51/64	3/8	3/16	25/32	30°	1-19/64	1-7/8	1-7/64	LS-2 RC-02 RK-02 RK-12
	CH-88-48	.7188-1.0625	23/32-1-1/16, 18.50-27.00mm	1-3/8	3	1-51/64	3/8	3/16	25/32	30°	1-19/64	1-7/8	1-7/64	LS-2 RC-02 RK-02 RK-12

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1-3/4" OD

QUANTITY	BASIC PART NO.	AVAILABLE ID SIZES	STANDARD DRILL SIZES	OD	LENGTH	F DIA	G	H	J	L	M	N DIA	R	LOCK SCREW
	CH-112-22	.9688-1.4062	31/32-1-13/32, 25.00-35.00mm	1-3/4	1-3/8	2-19/64	3/8	3/16	1	30°	1-41/64	2-3/8	1-25/64	LS-3 RC-03 RK-03 RK-13
	CH-112-28	.9688-1.4062	31/32-1-13/32, 25.00-35.00mm	1-3/4	1-3/4	2-19/64	3/8	3/16	1	30°	1-41/64	2-3/8	1-25/64	LS-3 RC-03 RK-03 RK-13
	CH-112-34	.9688-1.4062	31/32-1-13/32, 25.00-35.00mm	1-3/4	2-1/8	2-19/64	3/8	3/16	1	30°	1-41/64	2-3/8	1-25/64	LS-3 RC-03 RK-03 RK-13
	CH-112-40	.9688-1.4062	31/32-1-13/32, 25.00-35.00mm	1-3/4	2-1/2	2-19/64	3/8	3/16	1	30°	1-41/64	2-3/8	1-25/64	LS-3 RC-03 RK-03 RK-13
	CH-112-48	.9688-1.4062	31/32-1-13/32, 25.00-35.00mm	1-3/4	3	2-19/64	3/8	3/16	1	30°	1-41/64	2-3/8	1-25/64	LS-3 RC-03 RK-03 RK-13

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2-1/4" OD

QUANTITY	BASIC PART NO.	AVAILABLE ID SIZES	STANDARD DRILL SIZES	OD	LENGTH	F DIA	G	H	J	L	M	N DIA	R	LOCK SCREW
	CH-144-22	1.3438-1.8750	1-11/32-1-7/8, 35.00-47.00mm	2-1/4	1-3/8	2-51/64	3/8	3/16	1-1/4	25°	1-57/64	2-7/8	1-41/64	LS-3 RC-03 RK-03 RK-13
	CH-144-28	1.3438-1.8750	1-11/32-1-7/8, 35.00-47.00mm	2-1/4	1-3/4	2-51/64	3/8	3/16	1-1/4	25°	1-57/64	2-7/8	1-41/64	LS-3 RC-03 RK-03 RK-13
	CH-144-34	1.3438-1.8750	1-11/32-1-7/8, 35.00-47.00mm	2-1/4	2-1/8	2-51/64	3/8	3/16	1-1/4	25°	1-57/64	2-7/8	1-41/64	LS-3 RC-03 RK-03 RK-13
	CH-144-40	1.3438-1.8750	1-11/32-1-7/8, 35.00-47.00mm	2-1/4	2-1/2	2-51/64	3/8	3/16	1-1/4	25°	1-57/64	2-7/8	1-41/64	LS-3 RC-03 RK-03 RK-13
	CH-144-48	1.3438-1.8750	1-11/32-1-7/8, 35.00-47.00mm	2-1/4	3	2-51/64	3/8	3/16	1-1/4	25°	1-57/64	2-7/8	1-41/64	LS-3 RC-03 RK-03 RK-13

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