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Access Doors "QAD" Series

The QAD Series access doors that are a hinged design employ a viton® o-ring in the blank door itself and a standard MET-SEAL flange interface for bolting to the chamber itself. A rotary knob opens the door itself and the base flanges are offered with tapped holes and clearance holes. Clearance holes require the use of stainless steel socket head cap screw.

 

 

QADT Assemblies with Tapped Base Flange

 

QADT Assemblies with Tapped Base Flange

QADT Assemblies with Tapped Base Flange

 
PART NUMBER MET-SEAL FLANGE BASE FLANGE THREAD MET-SEAL BORE A B C D
QADT-275 2-3/4" OD 1/4-28 1.33" 1.74 2.25 .87 1.46
QADT-450 4-1/2" OD 5/16-24 2.50" 2.75 3.75 1.06 1.85
QADT-600 6" OD 5/16-24 4.02" 3.43 4.68 1.28 2.63
QADT-800 8" OD 5/16-24 5.80" 4.61 5.68 1.38 2.75
QADT-1000 10" OD 5/16-24 8.01" 5.74 6.67 1.46 2.85

 

 

QAD Assemblies with Thru Holes on Base Flange

 

QAD Assemblies with Thru Holes on Base Flange

QAD Assemblies with Thru Holes on Base Flange

 
PART NUMBER MET-SEAL FLANGE BASE FLANGE THRU HOLE MET-SEAL BORE A B C D
QAD-275 2-3/4" OD .265 1.33" 1.74 2.25 .87 1.46
QAD-450 4-1/2" OD .332" 2.50" 2.75 3.75 1.06 1.85
QAD-600 6" OD .332" 4.02" 3.43 4.68 1.28 2.63
QAD-800 8" OD .332" 5.80" 4.61 5.68 1.38 2.75
QAD-1000 10" OD .332" 8.01 5.74 6.67 1.46 2.85

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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