Compare Model Drawings, CAD & Specs Flange Size Material Seal Material Availability Price
Centering Ring Seal Assembly, ISO-KF, NW10, Buna-N O-ring, Aluminum
$4
In Stock
NW10 Aluminum Buna-N
In Stock
Centering Ring Seal Assembly, ISO-KF, NW16, Buna-N O-ring, Aluminum
$4.10
In Stock
NW16 Aluminum Buna-N
In Stock
Centering Ring Seal Assembly, ISO-KF, NW25, Buna-N O-ring, Aluminum
$4.90
In Stock
NW25 Aluminum Buna-N
In Stock
Centering Ring Seal Assembly, ISO-KF, NW40, Buna-N O-ring, Aluminum
$6.40
In Stock
NW40 Aluminum Buna-N
In Stock
Centering Ring Seal Assembly, ISO-KF, NW50, Buna-N O-ring, Aluminum
$9.20
In Stock
NW50 Aluminum Buna-N
In Stock
Centering Ring Seal Assembly, ISO-KF, NW10, Viton O-ring, Aluminum
$6.20
In Stock
NW10 Aluminum Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW16, Viton O-ring, Aluminum
$6.50
In Stock
NW16 Aluminum Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW25, Viton O-ring, Aluminum
$7.40
In Stock
NW25 Aluminum Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW40, Viton O-ring, Aluminum
$9.80
In Stock
NW40 Aluminum Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW50, Viton O-ring, Aluminum
$12.70
In Stock
NW50 Aluminum Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW10, Viton O-ring, 304 S.S.
$7
In Stock
NW10 Stainless Steel Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW16, Viton O-ring, 304 S.S.
$7.20
In Stock
NW16 Stainless Steel Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW25, Viton O-ring, 304 S.S.
$8.10
In Stock
NW25 Stainless Steel Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW40, Viton O-ring, 304 S.S.
$12.20
In Stock
NW40 Stainless Steel Viton
In Stock
Centering Ring Seal Assembly, ISO-KF, NW50, Viton O-ring, 304 S.S.
$15.90
In Stock
NW50 Stainless Steel Viton
In Stock
Centering Ring Assembly, NW16 ISO-KF, Buna-N O-ring, Stainless Steel
$6.60
In Stock
NW16 Stainless Steel Buna-N
In Stock
Centering Ring Assembly, NW25 ISO-KF, Buna-N O-ring, Stainless Steel
$7.90
In Stock
NW25 Stainless Steel Buna-N
In Stock
Centering Ring Assembly, NW40 ISO-KF, Buna-N O-ring, Stainless Steel
$13
In Stock
NW40 Stainless Steel Buna-N
In Stock
Centering Ring Assembly, NW50 ISO-KF, Buna-N O-ring, Stainless Steel
$15.30
In Stock
NW50 Stainless Steel Buna-N
In Stock
Centering Ring Seal Assembly, ISO-KF, NW16, Silicon O-ring, 304 S.S.
$9.80
In Stock
NW16 Stainless Steel Silicone
In Stock
Centering Ring Seal Assembly, ISO-KF, NW25, Silicon O-ring, 304 S.S.
$11.30
In Stock
NW25 Stainless Steel Silicone
In Stock
Centering Ring Seal Assembly, ISO-KF, NW40, Silicon O-ring, 304 S.S.
$13.20
In Stock
NW40 Stainless Steel Silicone
In Stock
Centering Ring Seal Assembly, ISO-KF, NW50, Silicon O-ring, 304 S.S.
$15.90
In Stock
NW50 Stainless Steel Silicone
In Stock

Specifications

  • Component Type
    Centering Ring Seal Assembly
  • Series
    Series 31
  • Flange Type
    ISO-KF

Features

Elastomer Comparison

Buna-N Viton® Silicone
Compound N674-70 V747-75 S604-70
Color Black Black Rust
Bakeout 80°C 150°C 185°C
Benefits Seals easier, lower cost Chemical resistance, lasts longer High temperature

ISO-KF Vacuum Flange Standard Dimensions

inch (mm)

The International Standards Organization has defined the interface dimensions of ISO-KF vacuum flanges allowing the interchanging of components that conform to the ISO-KF standard. The ISO-KF flange system provides is a modular building block method for creating a vacuum systems. Since component dimensions are standardized, elbows, tees, crosses or valves for a given flange size can be interchanged. The flanges are sexless and the seal is symmetrical allowing components to be rotated. By using ISO-KF standard components, vacuum system assembly is quick and cost effective.

Joining ISO-KF Vacuum Flanges

ISO-KF vacuum flange components are joined by inserting a centering ring seal between the two flange faces, then securing the assembly with a flange encompassing clamp. There are a variety of flange clamp choices available. The wing-nut flange clamp is hand tightened until metal contact is felt. The toggle flange clamp is convenient and easy to use and provides enough sealing force to fully compress the O-Ring, so that the flanges and the centering ring are metal to metal. The self-adjusting clamp locks in a positive method making it ideal when clamp must be removed frequently, like leak testing or gauge calibration. Bulkhead flange clamps attach an ISO-KF flange directly to a chamber or base plate. The two-part, bolted clamp fits over the flange with a centering ring assembly used between the flange and the opening.