Weld-on (W) Zero Length, UV Grade, Fused Silica Viewport 1.5 inch diameter, Stainless Steel These weld-on UV grade, zero length fused silica viewports have a 1.5 inch diameter weldable stainless steel flange. Weld-on fittings are used for permanent, non-alterable ultra-high vacuum applications. These fittings use a welded stainless steel bead to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 200 °C for bake-out. These vacuum fittings are made of corrosion resistant stainless steel. Weld-On (W) Zero Length UV Grade Fused Silica Viewport 1.5 inch diameter Material: Corning HPFS 7980 Fused Silica (excellent transmission for UV to 250nm), Stainless Steel Thermal Range: -100 °C to 200 °C Common Dimensions A. 1.50 B. 1.37 C. .125 D. .680 E. .850 F. 1.76

Conflat Flange (CF) Zero Length Glass Viewport 3/4 inch to CF 1-1/3 inch, Stainless Steel Fittings These conflat to zero length glass viewports vacuum fittings have a flange size of ConFlat (CF) 1-1/3 inch to Glass Viewport 0.75 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange (CF) Zero Length Glass Viewport 3/4 inch to CF 1-1/3 inch, Stainless Steel Fittings CF Flange Size: CF 1-1/3 inch to Zero Length Glass Viewport 3/4 inch Common Dimensions: A= Port Diameter 0.75 inch

Conflat Flange (CF) Zero Length Fused Silica Viewport CFF 1.33 inch, 304 Stainless Steel, UVThese conflat, zero length fused silica viewports have a flange size of ConFlat (CF) 1.33 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 ("mini conflat"), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel.Conflat Flange (CF) Zero Length Fused Silica Viewport CF 1.33 inchMaterial: Corning HPFS 7980 Fused Silica, 304 SS Thermal Range: -100 °C to 200 °C Common Dimensions A. 0.63" B. 0.085" C. 0.35" D. 1.33" E. 304 SS sleeve & flange

Conflat Flange (NON-MAGNETIC) (CF) Zero Length, UV Grade, Fused Silica Viewport CF 1.33 inch, 316LN Stainless Steel These conflat UV grade, zero length fused silica viewports have a flange size of ConFlat (CF) 1.33 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange (CF) Zero Length Fused Silica Viewport CF 1.33 inch Material: Corning HPFS 7980 Fused Silica, 316 LN SS Thermal Range: -100 °C to 200 °C Common Dimensions A. 0.63 B. 0.085 C. 0.35 D. 1.33 E. 316 LN sleeve & flange (non-magnetic)

Conflat Flange (CF) Zero Length, UV Grade, SAPPHIRE, 0.46 Viewport Diameter, CF 1.33 inch, 304 SS PN: A1858-1-CF This conflat UV grade, zero length viewport flange has a viewport measuring 0.46 diameter and is SAPPHIRE. The flange size is ConFlat (CF) 1.33 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel.

Conflat Flange (CF) Zero Length Glass Viewport 1.5 inch to CFF 2-3/4 inch, Stainless Steel Fittings These conflat to zero length glass viewports vacuum fittings have a flange size of ConFlat (CF) 2-3/4 inch to Glass Viewport 1.5 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 400 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange (CF) Zero Length Glass Viewport 1.5 inch to CF 2-3/4 inch, Stainless Steel Fittings CF Flange Size: CF 2-3/4 inch to Zero Length Glass Viewport 1.5 inch Common Dimensions: A= Port Diameter 1.5 inch Pressure Range= ATM to 10-11torr

Ultra High Vacuum (UHV) Inline Optic Mount, Conflat Flange (CF-2.75 in.), for 1" Optic, 304 SS with Aluminum Retaining Ring. These 1.0” optic mounts are machined into a stainless steel double sided conflat 2.75” flange designed for inline use in Ultra High Vacuum (UHV) systems. The optic may be up to 1.0” OD and up to 0.35” thick. It is held in place with a non-anodized aluminum SM1 retaining ring for easy removal and replacement. The kit includes ¼”-28 socket head screws that accept an IP30 Torx bit, with lengths suitable for mounting to tapped or through-hole flanges. Pair these optic mounts with any of our zero-length UHV compatible viewports to make an UHV optical system.

Viewport, Magnesium Fluoride, Zero Length 2.75 inch Conflat Flange (CF-2.75 in.), AR Coating, 0.9 Viewport Diameter, 304 Stainless Steel Magnesium fluoride transmits well between the deep ultraviolet and the mid-infrared regions and is used mostly for UV optics and Excimer laser applications. These MgF2 windows are usable in the UVA, UVB, visible and IR ranges, with approximately 94% transmission from 200 - 1000 nm, and approximately 95% transmission from 1 - 6 µm. Magnesium fluoride is a tough material, polishes well, and can be worked to a high standard. It is slightly birefringent and usually manufactured into viewport windows where the optic axis cut perpendicular to the window face. MgF2 is also naturally birefringent, making it an ideal material for use in retardation plates and polarizing elements, particularly in the wavelength range from 0.13-0.30 µm. When handling optics, always wear soft, non-absorbent, lint-free gloves. Please observe the following procedure when cleaning these viewports: • Always start by blowing off window first with clean, dry compressed air. This will remove any potentially hard, gritty dust that could cause scratching during cleaning. • Always use a solvent-dampened swab to wipe clean a window, a dry swab can potentially scratch a window and in any event will leave more than it cleans if not damp. • Excess solvent should be flung off by a flip of the wrist. If the swab is heavily soaked with solvent, the window will rapidly chill due to solvent evaporation; this will result in water condensation from the air. It may cause spotting or delays in cleaning. It is best to flip off the excess before touching the window with the swab. Alternatively, one can daub the swab on a piece of lint-free tissue to partially remove solvent. • Compressed air in a can, if tipped upside down or violently shaken, will cause solvent to spray out with the air. No canned duster is perfect. Occasionally some solvent will contaminate the window. The best solution is to use a regulated supply of commercial dry compressed nitrogen gas from a welding gas supply company. • Always handle the window with protected hands. Powder-free vinyl gloves work best; but, if touched with acetone they can dissolve and leave residue on the window. One should carefully avoid contacting the cleaning swab directly with the glove during the cleaning procedure.

Viewport, Fused Silica, Zero Length 2.75 inch Conflat Flange (CF-2.75 in.), DUV Grade, AR Coating, 1.4 Viewport Diameter, 304 SS DUV-grade fused silica for applications requiring transmission deep into the ultraviolet spectrum in addition to a low index of refraction for a given wavelength, excellent homogeneity, and low coefficient of thermal expansion. Unlike common glasses (Pyrex, borosilicate, soda-lime, etc.) fused silica contains no Na2O, CaO, or B2O3 and is composed exclusively of high-purity silica (SiO2) in amorphous (non-crystalline) form. It has a much higher working and melting temperature than other common optical glasses, and has exceptional optical, thermal, and mechanical properties. Fused silica is highly resistance to thermal shock, and is an excellent material for applications requiring the utmost in dimensional stability over a large temperature range and steep thermo-temporal gradients. For comparison, INVAR (a nickel-iron alloy), which has the lowest thermal expansion among all metals and alloys near room temperature, has a mean coefficient of thermal expansion that is more than twice that of fused silica over a temperature range of 20°C to 100°C. Fused Silica is an extremely inert glass and is compatible with the vast majority of chemicals used in the industry and in the laboratory. There are only a few uncommon materials that will attack it, including HF (hydrofluoric acid) and hot KOH (Potassium hydroxide). Although this substrate does not scratch easily, it should, like all fine optics, be handled with care. When handling optics, always wear soft, non-absorbent, lint-free gloves. Please observe the following procedure when cleaning these viewports: • Always start by blowing off window first with clean, dry compressed air. This will remove any potentially hard, gritty dust that could cause scratching during cleaning. • Always use a solvent-dampened swab to wipe clean a window, a dry swab can potentially scratch a window and in any event will leave more than it cleans if not damp. • Excess solvent should be flung off by a flip of the wrist. If the swab is heavily soaked with solvent, the window will rapidly chill due to solvent evaporation; this will result in water condensation from the air. It may cause spotting or delays in cleaning. It is best to flip off the excess before touching the window with the swab. Alternatively, one can daub the swab on a piece of lint-free tissue to partially remove solvent. • Compressed air in a can, if tipped upside down or violently shaken, will cause solvent to spray out with the air. No canned duster is perfect. Occasionally some solvent will contaminate the window. The best solution is to use a regulated supply of commercial dry compressed nitrogen gas from a welding gas supply company. • Always handle the window with protected hands. Powder-free vinyl gloves work best; but, if touched with acetone they can dissolve and leave residue on the window. One should carefully avoid contacting the cleaning swab directly with the glove during the cleaning procedure.

Conflat Flange (CF) Zero Length Glass Viewport 2.5 inch to CF 4-1/2 inch, Stainless Steel Fittings These conflat to zero length glass viewports vacuum fittings have a flange size of ConFlat (CF) 4-1/2 inch to Glass Viewport 2.5 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange (CF) Zero Length Glass Viewport 2.5 inch to CF 4-1/2 inch, Stainless Steel Fittings CF Flange Size: CF 4-1/2 inch to Zero Length Glass Viewport 2.5 inch Common Dimensions: A= Port Diameter 2.5 inch

Zero Length Viewport, CF-4.5 in., Fused Silica, DUV Laser Grade, AR Coating at 532nm and 1064nm, 2.69" View Diameter, 304 Stainless Steel. These zero length viewport are on a CF-4.5 in. flange and have a 2.69" view diameter (clear aperture). They are used for ultra-high vacuum applications are dual coated for antireflection at 532nm and 1064nm on both sides. These fittings use a copper gasket and steel knife-edge to achieve an ultra high vacuum compatible seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 200 °C for bake out. North American flange sizes are given by flange outer diameter in inches. These vacuum fittings are made of stainless steel. Specifications: Material: Corning HPFS 7980 Fused Silica TWD <4 @ 632nm (Peak to Valley) Parallelism < 10 arc seconds Surface Finishc: 20/10 Scratch-Dig Thermal Range: -100 °C to +200 °C Homogeneity Grade: A Inclusion Class: 0 Dual AR Coating Both Sides @ 532 & 1064nm, R < 0.25% Per Surface Laser Damage Threshold: 10 J/cm2

Conflat Flange (CF) Zero Length, UV Grade, Fused Silica Viewport CF 4.50 inch, 304 Stainless Steel MPF Products P/N A0651-3-CF These conflat UV grade, zero length fused silica viewports have a flange size of ConFlat (CF) 4.50 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 200 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosion resistant stainless steel. Conflat Flange (CF) Zero Length Fused Silica Viewport CF 4.50 inch Material: Corning HPFS 7980 Fused Silica, 304 SS Thermal Range: -100 C(148F) to 200 C(392F) Common Dimensions A. 2.69 B. 0.25 C. 0.68 D. 4.50 E. 304 SS sleeve & flange

Conflat Flange (CF) Zero Length, UV Grade, Fused Silica Viewport CF 4.50 inch, 304 Stainless Steel Nor-Cal Products P/N ZVQ-250 These conflat UV grade, zero length fused silica viewports have a flange size of ConFlat (CF) 4.50 inch. ConFlat (CF) flanges are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 200 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosion resistant stainless steel. Conflat Flange (CF) Zero Length Fused Silica Viewport CF 4.50 inch Material: Fused Silica, 304 SS Thermal Range: -20 C(40F) to 200 C (392F) Common Dimensions A. 2.69 B. 0.25 C. 0.68 D. 4.50 E. 304 SS sleeve & flange

Zinc Selenide Laser Viewport for Transmitting Infrared Light, CF-4.5 in., UHV Grade, 1.9" Viewport Diameter, Zero-Length, 304 SSFor many MWIR (Mid-Wave Infrared) to IR applications requiring broad range transmission of infrared (IR) light, these zero-length viewports offer low absorptivity of wavelengths up to 16 microns. Importantly, these ZnSe viewports are highly resistant to thermal shocks rendering them ideal for high power applications using CO2 laser systems. Additionally, these viewports allow some transmission of visible light, making fine tuning of optical aligments and interior components using combination CO2-HeNe lasers simple and easy. Unless treated with strong acids, ZnSe is chemically stable and non-hygroscopic and safe to use in many industrial, field, and laboratory applications. This substrate scratches easily and should be handled with care. When handling optics, always wear soft, non-absorbent, lint-free gloves. Never use ultrasonic cleaning methods to treat ZnZe viewports. Please observe the following procedure when cleaning these viewports: • Always start by blowing off window first with clean, dry compressed air. This will remove any potentially hard, gritty dust that could cause scratching during cleaning.• Always use a solvent-dampened swab to wipe clean a window, a dry swab can potentially scratch a window and in any event will leave more than it cleans if not damp.• Excess solvent should be flung off by a flip of the wrist. If the swab is heavily soaked with solvent, the window will rapidly chill due to solvent evaporation; this will result in water condensation from the air. It may cause spotting or delays in cleaning. It is best to flip off the excess before touching the window with the swab. Alternatively, one can daub the swab on a piece of lint-free tissue to partially remove solvent.• Compressed air in a can, if tipped upside down or violently shaken, will cause solvent to spray out with the air. No canned duster is perfect. Occasionally some solvent will contaminate the window. The best solution is to use a regulated supply of commercial dry compressed nitrogen gas from a welding gas supply company.• Always handle the window with protected hands. Powder-free vinyl gloves work best; but, if touched with acetone they can dissolve and leave residue on the window. One should carefully avoid contacting the cleaning swab directly with the glove during the cleaning procedure.

Conflat Flange CF 6.0 inches Zero Length, Glass Viewport 4.0 inches, Stainless Steel Fittings These conflat to zero length glass viewports vacuum fittings have a flange size of Conflat Flange CF 6.0 inch and a Zero Length Glass Viewport 4.0 inch in diameter. They are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange CF 6.0 inches Zero Length, Glass Viewport 4.0 inches, Stainless Steel Fittings CF Flange Size: CF 6.0 inches Zero Length Glass Viewport 4.0 inches Common Dimensions: A= Port Diameter 4.0 inches

MPF Conflat Flange UV Grade Sapphire CF 6.0 inches, Glass Viewport 2.95 in view dia, 304 Stainless Steel Fitting. These conflat to zero length glass viewport vacuum fittings have a flange size of Conflat Flange CF 6.0 inch and a Zero Length Glass Viewport 2.95 in view diameter. They are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange CF 6.0 inches Zero Length, Glass Viewport 2.95 in. view diameter, Stainless Steel Fittings CF Flange Size: CF 6.0 inches Zero Length Glass Viewport 2.95 in. view dia. SPECIFICATIONS: MATERIAL: SAPPHIRE TWD @ 632nm (PEAK TO VALLEY) PARALLELISM < 3 ARC MINUTES SURFACE FINISH: 50/20 SCRATCH-DIG THERMAL RANGE: -100 C TO 450 C ORIENTATION: RANDOM LEAK RATE < 1 X 10-9 ATM CC/SEC HE

Conflat Flange CF 8.0 inches, Zero Length Glass Viewport 6.0 inches, Stainless Steel Fittings These conflat to zero length glass viewports vacuum fittings have a flange size of Conflat Flange CF 8.0 inch and a Zero Length Glass Viewport 6.0 inch in diameter. They are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange CF 8.0 inches, Zero Length Glass Viewport 6.0 inches Fittings CF Flange Size: CF 8.0 inches Glass Viewport 6.0 inch Common Dimensions: A= Port Diameter 6.0 inches

MPF UV Grade Fused Silica Viewport, Zero Length Profile, 7.78 in. View Dia, CF 10 Conflat Flange, Stainless Steel Fittings, Stainless Steel Fittings MPF UV Grade Fused Silica Viewport, Zero Length Profile, 7.78 in. View Dia, 10.00 in. Conflat Flange. These zero length glass viewports vacuum fittings have a flange size of Conflat Flange CF 10 inch and a Zero Length Glass Viewport 7.78 inch in diameter. They are used for ultra-high vacuum applications. These fittings use a copper gasket and knife-edge flanges to achieve the high vacuum seal and can operate down to 10-13 torr (10-11 Pa) and can be heated to 450 °C for bake-out. North American flange sizes are given by flange outer diameter in inches: 1-1/3 (mini conflat), 2¾, 4½, 6, 8, 10, 12, 13¼, 14 and 16½. In Europe and Asia, sizes are given by tube inner diameter in millimeters: DN16, DN40, DN63, DN100, DN160, DN200, DN250. These vacuum fittings are made of corrosive resistant stainless steel. Conflat Flange CF 10 inches, Zero Length Glass Viewport 7.78 inches FittingsCF Flange Size: CF 10 inchesGlass Viewport 7.78 inchCommon Dimensions: A= Port Diameter 6.0 inches