NW Flanges, Centering Rings; Weld Ring Stainless Steel, Centering Rings Aluminum / Buna, Aluminum / Viton®

Flange Weld Ring

Stainless steel type 304
Low profile

Flange Weld Ring

PART NUMBER	TUBE OD	ISO	A	B
KSF-9810	3/8”	NW 10	0.380	0.250
KSF-9816	3/8”	NW 16	0.380	0.343
KSF-9816-1	1/2”	NW 16	0.510	0.461
KSF-9816-2	3/4”	NW 16	0.760	0.625
KSF-9825	3/8”	NW 25	0.380	0.343
KSF-9825-1	1/2”	NW 25	0.510	0.461
KSF-9825-2	3/4”	NW 25	0.760	0.625
KSF-9825-3	1”	NW 25	1.010	0.938
KSF-9840	3/8”	NW 40	0.380	0.343
KSF-9840-1	1/2”	NW 40	0.510	0.461
KSF-9840-2	3/4”	NW 40	0.760	0.725
KSF-9840-3	1”	NW 40	1.010	0.938
KSF-9840-4	1-1/2”	NW 40	1.510	1.438
KSF-9850	3/8”	NW 50	0.380	0.343
KSF-9850-1	1/2”	NW 50	0.510	0.461
KSF-9850-2	3/4”	NW 50	0.760	0.725
KSF-9850-3	1”	NW 50	1.010	0.938
KSF-9850-4	1-1/2”	NW 50	1.510	1.438
KSF-9850-5	2”	NW 50	2.010	1.938

Seal Centering Ring Assembly

Aluminum centering ring
Replaceable Buna-N O-ring
100° C maximum bake out

Seal Centering Ring Assembly

PART NUMBER	TUBE OD	ISO	A	B
KSCR-1510	1/2”	NW 10	0.394	0.210
KSCR-1516	3/4”	NW 16	0.630	0.210
KSCR-1525	1”	NW 25	0.984	0.210
KSCR-1540	1-1/2”	NW 40	1.575	0.210
KSCR-1550	2”	NW 50	1.969	0.210

Seal Centering Ring Assembly

Aluminum centering ring
Replaceable Viton® O-ring
200° C maximum bake out

Seal Centering Ring Assembly

PART NUMBER	TUBE OD	ISO	A	B
KSCR-1610	1/2”	NW 10	.394	0.210
KSCR-1616	3/4”	NW 16	.630	0.210
KSCR-1625	1”	NW 25	.984	0.210
KSCR-1640	1-1/2”	NW 40	1.575	0.210
KSCR-1650	2”	NW 50	1.969	0.210

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

/ Products / Product Catalog / ISO Flanges & Fittings / NW Flanges, Centering Rings; Weld Ring Stainless Steel, Centering Rings Aluminum / Buna, Aluminum / Viton®

Product Catalog

Industry Solutions

About Key High

Service & Support

Resources

Precision Welded. Performance Proven.

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