ISO KF & LF Fittings

Introduction

MDC Kwik-Flange™ ISO KF and Large-Flange™ ISO LF Tube Fittings are convenient “building-block” components. They offer great flexibility in the design and construction of high vacuum systems.

Features

High Vacuum rated to1x10-8 Torr
Temperature rated to 200°C
Symmetric, non totatable geometries
Rotatable Bolt Rings available for LF sizes.
Viton® or Buna-N® O-Rings
Standard matte finish
ISO compatible design for full range of KF and LF sizes, NW16 to NW500

Specifications
Material
Flanges	304ss
Tubing	304ss
Finish	Standard matte finish
Vacuum Range	1x10^-8 Torr
Fitting Leak Test	2x10^-10 cc/ sec of He

Temp.Range	Minimum	Intermittent	Sustained
Viton®	-20°C	200°C	150°C
Buna-N®	-20°C	100°C	80°C
Silicone	-50°C	200°C	150°C

All fittings are fabricated from type 304 stainless steel drawn and welded vacuum tubing. Flanges do not need to be rotatable since they are completely symmetric. If desired, Rotatable Bolt Ring Assemblies can be retrofitted to existing Claw-Clamp style flanges to add bolt holes to ISO LF fittings.

Reducers are used for a change in size of flanges within a single method of sealing, such as elastomer sealing of ISO KF and LF flanges.
Adapters are used to change from one method of sealing to another, such as elastomer seal ISO to metal seal CF.

Inch-Metric ISO Comparision
MDC	O.D Inches	ISO	I.D. mm	Inches
Kwik-Flange™ ISO KF
K075	0.75	NW16	16	0.63
K100	1.00	NW25	25	0.98
K150	1.50	NW40	40	1.57
K200	2.00	NW50	50	1.97

Large-Flange™ ISO LF
L250	2.50	NW63	63	2.48
L300	3.00	NW80	80	3.15
L400	4.00	NW100	100	3.94
L600	6.00	NW160	160	6.30
L800	8.00	NW200	200	7.87
L1000	10.00	NW250	250	9.84
L1200	12.75	NW320	320	12.60
L1600	16.00	NW400	400	15.75
L2000	20.00	NW500	500	19.69