Rotatable ASA Flanges

Key High's ASA flanges are directly descended from ASA/ANSI 150 # flanges. ASA /ANSI flanges are usually found in larger-scale industrial equipment. Our ASA flanges are manufactured from 304 stainless steel and are sized to accept tubing from 1-1/2" OD to 12" OD. Rotatable ASA flanges have a two-piece design (receiver and insert), which allows the flange receiver to be rotated, aligning the bolt holes during installation. These ASA flanges are rugged and designed to be used in high vacuum and medium pressure applications. The large bolts used on ASA flanges can withstand vibration and temperature extremes. As with all the O-ring flanges in this section, one has an O-ring groove, and the other mating flange is smooth-faced.

Manufactured from 304 Stainless Steel

Grooved flanges include Viton® O-Ring

Operating temperature 0 to 180°C

Offered for 1-1/2" OD tube to 12"<

Rotatable ASA Flanges Ordering Information

PART NUMBER	A FLANGE DIA	B	C	D	E	F	NUMBER OF HOLES	HOLE DIA	O-RING NO.
R-ASA-4-P	4.250"	3.125"	.500"	-	-	-	4	.625"	-
R-ASA-4-P-O	4.250"	3.125"	.500"	-	-	-	4	.625"	2-226
R-ASA-4-B	4.250"	3.125"	.500"	1.510"	1.375"	.250"	4	.625"	-
R-ASA-4-B-O	4.250"	3.125"	.500"	1.510"	1.375"	.250"	4	.625"	2-226
R-ASA-5-P	5.000"	3.880"	.500"	-	-	-	4	.625"	-
R-ASA-5-P-O	5.000"	3.880"	.500"	-	-	-	4	.625"	2-231
R-ASA-5-B	5.000"	3.880"	.500"	2.010"	1.875	.250"	4	.625"	-
R-ASA-5-B-O	5.000"	3.880"	.500"	2.010"	1.875"	.250"	4	.625"	2-231
R-ASA-5-B-25	5.000"	3.880"	.500"	2.510"	2.375"	.250"	4	.625"	-
R-ASA-5-B-25-O	5.000"	3.880"	.500"	2.510"	2.375"	.250"	4	.625"	2-231
R-ASA-6-P	6.000"	4.750"	.625"	-	-	-	4	.687"	-
R-ASA-6-P-O	6.000"	4.750"	.625"	-	-	-	4	.687"	2-238
R-ASA-6-B	6.000"	4.750"	.625"	3.010"	2.937"	.312"	4	.687"	-
R-ASA-6-B-O	6.000"	4.750"	.625"	3.010"	2.937"	.312"	4	.687"	2-238
R-ASA-6-B-35	6.000"	4.750"	.625"	3.510"	3.437"	.312"	4	.687"	-
R-ASA-6-B-35-O	6.000"	4.750"	.625"	3.510"	3.437"	.312"	4	.687"	2-239
R-ASA-7-P	7.500"	6.000"	.625"	-	-	-	4	.750"	-
R-ASA-7-P-O	7.500"	6.000"	.625"	-	-	-	4	.750"	2-243
R-ASA-7-B	7.500"	6.000"	.625"	4.015"	3.875"	.312"	4	.750"	-
R-ASA-7-B-O	7.500"	6.000"	.625"	4.015"	3.875"	.312"	4	.750"	2-243
R-ASA-9-P	9.000"	7.500"	.625"	-	-	-	8	.687"	-
R-ASA-9-P-O	9.000"	7.500"	.625"	-	-	-	8	.687"	2-258
R-ASA-9-B	9.000"	7.500"	.625"	4.015"	3.875"	.312"	8	.687"	-
R-ASA-9-B-O	9.000"	7.500"	.625"	4.015"	3.875"	.312"	8	.687"	2-258
R-ASA-9-B-6	9.000"	7.500"	.625"	6.025"	5.875"	.312"	8	.687"	-
R-ASA-9-B-6-O	9.000"	7.500"	.625"	6.025"	5.875"	.312"	8	.687"	2-258
R-ASA-11-P	11.000"	9.500"	.750"	-	-	-	8	.812"	-
R-ASA-11-P-O	11.000"	9.500"	.750"	-	-	-	8	.812"	2-266
R-ASA-11-B	11.000"	9.500"	.750"	6.025"	5.875"	.375"	8	.812"	-
R-ASA-11-B-O	11.000"	9.500"	.750"	6.025"	5.875"	.375"	8	.812"	2-266
R-ASA-11-B-8	11.000"	9.500"	.750"	8.025"	7.875"	.375"	8	.812"	-
R-ASA-11-B-8-O	11.000"	9.500"	.750"	8.025"	7.875"	.375"	8	.812"	2-266
R-ASA-13-P	13.500"	11.750"	.750"	-	-	-	8	.812"	-
R-ASA-13-P-O	13.500"	11.750"	.750"	-	-	-	8	.812"	2-274
R-ASA-13-B	13.500"	11.750"	.750"	8.025"	7.875"	.375"	8	.812"	-
R-ASA-13-B-O	13.500"	11.750"	.750"	8.025"	7.875"	.375"	8	.812"	2-274
R-ASA-13-B-10	13.500"	11.750"	.750"	10.025"	9.875"	.375"	8	.812"	-
R-ASA-13-B-10-O	13.500"	11.750"	.750"	10.025"	9.875"	.375"	8	.812"	2-274
R-ASA-16-P	16.000"	14.250"	.750"	-	-	-	12	.812"	-
R-ASA-16-P-O	16.000"	14.250"	.750"	-	-	-	12	.812"	2-278
R-ASA-16-B	16.000"	14.250"	.750"	10.025"	9.875"	.375"	12	.812"	-
R-ASA-16-B-O	16.000"	14.250"	.750"	10.025"	9.875"	.375"	12	.812"	2-278
R-ASA-16-B-12	16.000"	14.250"	.750"	12.025"	11.875"	.375"	12	.812"	-
R-ASA-16-B-12-O	16.000"	14.250"	.750"	12.025"	11.875"	.375"	12	.812"	2-278

Product information is subject to change without notice. Product images may include options or accessories not included with the base model.

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For 50 years, Key High Vacuum Products, Inc. has been a trusted leader in precision-engineered stainless steel high vacuum weldments. With tens of thousands of unique weldments in use—from particle accelerators to industrial leak detectors—our expertise is proven across industries. Rooted in innovation, craftsmanship, and an unwavering commitment to customer satisfaction, we deliver high-quality, customized solutions that drive success. Every day, our team brings a unique blend of passion and precision, ensuring your goals are met with excellence—because your mission matters. Experience the Key High difference.

Key High Vacuum Products, Inc.

36 Southern Boulevard, Nesconset, NY 11767

1-631-360-3970