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Reducer Nipples, ASA to ASA & ASA to Met-Seal

These reducing nipples are designed to connect different flange types and diameter flanges. These hybrid straight-reducing nipples have a smaller flange that is rotatable, which allows the receiver bolt circle to be rotated to the existing fixed flange.
  • 304 Stainless Steel Construction
  • Connects different flange types
  • Commonly used for retrofitting existing equipment
  • Custom lengths, tubes, etc., available upon request

 

 

ASA Reducers

ASA Reducers

ASA Reducers

 
PART NUMBER FLANGE SIZES A TUBE
RN-ASA-9-5 9" OD to 5" OD 4.50 2" OD
RN-ASA-9-6 9" OD x 6" OD 4.50 3" OD
RN-ASA-9-7.5 9" OD x 7-1/2" OD 4.50 4" OD
RN-ASA-11-5 11" OD x 5" OD 4.75 2" OD
RN-ASA-11-6 11" OD x 6" OD 4.75 3" OD
RN-ASA-11-7.5 11" OD x 7-1/2" OD 4.75 4" OD
RN-ASA-11-9 11" OD x 9" OD 4.75 6" OD
RN-ASA-13.5-9 13-1/2" OD x 9" OD 5.00 6" OD
RN-ASA-13.5-11 13-1/2" OD x 11" OD 5.00 8" OD
RN-ASA-16-11 16" OD x 11" OD 5.00 8" OD
RN-ASA-16-13.5 16" OD x 13-1/2 OD 5.00 10" OD

 

Options: ASA Reducers

O-ring grooves are available on ASA flanges. Add option code to suffix of part number.

DESCRIPTION OPTION CODE
One O-ring Groove. Designate Which Flange is Required with O-ring Groove. -1OR
Two O-Ring Grooves Required. -2OR

 

 

ASA to MET-SEAL Adapter Nipples

ASA to MET-SEAL Adapter Nipples

ASA to MET-SEAL Adapter Nipples

 
PART NUMBER MET-SEAL OD ASA OD A TUBE OD
FN133-ASA4 1-1/3" 4-1/4" 5.00 3/4"
FN133-ASA5 1-1/3" 5" 5.00 3/4"
FN275-ASA5 2-3/4" 5" 5.00 1-1/2"
FN275-ASA6 2-3/4" 6" 5.00 1-1/2"
FN275-ASA7.5 2-3/4" 7-1/2" 5.00 1-1/2"
FN275-ASA9 2-3/4" 9" 5.00 1-1/2"
FN275-ASA11 2-3/4" 11" 5.00 1-1/2"
FN338-ASA5 3-3/8" 5" 5.00 2"
FN338-ASA6 3-3/8" 6" 5.00 2"
FN338-ASA7.5 3-3/8" 7-1/2" 5.00 2"
FN338-ASA9 3-3/8" 9" 5.00 2"
FN338-ASA11 3-3/8" 11" 5.00 2"
FN450-ASA5 4-1/2" 5" 5.00 2-1/2"
FN450-ASA6 4-1/2" 6" 5.00 2-1/2"
FN450-ASA7.5 4-1/2" 7-1/2" 5.00 2-1/2"
FN450-ASA9 4-1/2" 9" 5.00 2-1/2"
FN450-ASA11 4-1/2" 11" 5.00 2-1/2"
FN600-ASA7.5 6" 7-1/2" 5.00 4"
FN600-ASA9 6" 9" 5.00 4"
FN600-ASA11 6" 11" 5.00 4"
FN800-ASA7.5 8" 7-1/2" 5.00 4"
FN800-ASA9 8" 9" 5.00 6"
FN800-ASA11 8" 11" 5.00 6"
FN1000-ASA7.5 10" 7-1/2" 5.00 4"
FN1000-ASA9 10" 9" 5.00 6"
FN1000-ASA11 10" 11" 5.00 8"

 

Options: ASA to MET-SEAL Adapter Nipples

O-ring grooves are available on all ASA flanges. Add option code to suffix of part number.

DESCRIPTION OPTION CODE
One O-ring Groove. Designate Which Flange is Required with O-ring Groove. -1OR

 


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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