Non-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.

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 flange 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" OD tube

Non-Rotatable ASA Flanges Ordering Information

PART NUMBER	A FLANGE DIA	B	C	D	E	F	NUMBER OF HOLES	HOLE DIA	O-RING NO.
ASA-4-P	4.250"	3.125"	.500"	-	-	-	4	.625"	-
ASA-4-P-O	4.250"	3.125"	.500"	-	-	-	4	.625"	2-226
ASA-4-B	4.250"	3.125"	.500"	1.510"	1.375"	.375"	4	.625"	-
ASA-4-B-O	4.250"	3.125"	.500"	1.510"	1.375"	.375"	4	.625"	2-226
ASA-5-P	5.000"	3.880"	.500"	-	-	-	4	.625"	-
ASA-5-P-O	5.000"	3.880"	.500"	-	-	-	4	.625"	2-231
ASA-5-B	5.000"	3.880"	.500"	2.010"	1.875	.375"	4	.625"	-
ASA-5-B-O	5.000"	3.880"	.500"	2.010"	1.875"	.375"	4	.625"	2-231
ASA-5-B-25	5.000"	3.880"	.500"	2.510"	2.375"	.375"	4	.625"	-
ASA-5-B-25-O	5.000"	3.880"	.500"	2.510"	2.375"	.375"	4	.625"	2-231
ASA-6-P	6.000"	4.750"	.500"	-	-	-	4	.687"	-
ASA-6-P-O	6.000"	4.750"	.500"	-	-	-	4	.687"	2-238
ASA-6-B	6.000"	4.750"	.500"	3.010"	2.937"	.375"	4	.687"	-
ASA-6-B-O	6.000"	4.750"	.500"	3.010"	2.937"	.375"	4	.687"	2-238
ASA-6-B-35	6.000"	4.750"	.500"	3.510"	3.437"	.375"	4	.687"	-
ASA-6-B-35-O	6.000"	4.750"	.500"	3.510"	3.437"	.375"	4	.687"	2-239
ASA-7-P	7.500"	6.000"	.500"	-	-	-	4	.750"	-
ASA-7-P-O	7.500"	6.000"	.500"	-	-	-	4	.750"	2-243
ASA-7-B	7.500"	6.000"	.500"	4.015"	3.875"	.375"	4	.750"	-
ASA-7-B-O	7.500"	6.000"	.500"	4.015"	3.875"	.375"	4	.750"	2-243
ASA-9-P	9.000"	7.500"	.500"	-	-	-	8	.687"	-
ASA-9-P-O	9.000"	7.500"	.500"	-	-	-	8	.687"	2-259
ASA-9-B	9.000"	7.500"	.500	4.015"	3.875"	.375"	8	.687"	-
ASA-9-B-O	9.000"	7.500"	.500"	4.015"	3.875"	.375"	8	.687"	2-259
ASA-9-B-6	9.000"	7.500"	.500"	6.025"	5.875"	.375"	8	.687"	-
ASA-9-B-6-O	9.000"	7.500"	.500"	6.025"	5.875"	.375"	8	.687"	2-259
ASA-11-P	11.000"	9.500"	.750"	-	-	-	8	.812"	-
ASA-11-P-O	11.000"	9.500"	.750"	-	-	-	8	.812"	2-266
ASA-11-B	11.000"	9.500"	.750"	6.025"	5.875"	.375"	8	.812"	-
ASA-11-B-O	11.000"	9.500"	.750"	6.025"	5.875"	.375"	8	.812"	2-266
ASA-11-B-8	11.000"	9.500"	.750"	8.025"	7.875"	.375"	8	.812"	-
ASA-11-B-8-O	11.000"	9.500"	.750"	8.025"	7.875"	.375"	8	.812"	2-266
ASA-13-P	13.500"	11.750"	.750"	-	-	-	8	.812"	-
ASA-13-P-O	13.500"	11.750"	.750"	-	-	-	8	.812"	2-274
ASA-13-B	13.500"	11.750"	.750"	8.025"	7.875"	.375"	8	.812"	-
ASA-13-B-O	13.500"	11.750"	.750"	8.025"	7.875"	.375"	8	.812"	2-274
ASA-13-B-10	13.500"	11.750"	.750"	10.025"	9.875"	.375"	8	.812"	-
ASA-13-B-10-O	13.500"	11.750"	.750"	10.025"	9.875"	.375"	8	.812"	2-274
ASA-16-P	16.000"	14.250"	.750"	-	-	-	12	.812"	-
ASA-16-P-O	16.000"	14.250"	.750"	-	-	-	12	.812"	2-278
ASA-16-B	16.000"	14.250"	.750"	10.025"	9.875"	.375"	12	.812"	-
ASA-16-B-O	16.000"	14.250"	.750"	10.025"	9.875"	.375"	12	.812"	2-278
ASA-16-B-12	16.000"	14.250"	.750"	12.025"	11.875"	.375"	12	.812"	-
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.

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