SRF Series Reducing Full-Face Flanges
Standard Class 150 (150 lb.) Reducing Full-Face Flanges
Base Part Number: As shown here, the BASE PART NUMBER defines the Series (three characters), the material (one character), the nominal size, the reduced center hole pipe size RR and the thickness TH. Use a decimal number to indicate the nominal size. Replace RR in the part number with the reduction pipe size in decimals. Then, for thicknesses up to 6”, replace the TH with the decimal thickness. For thickness over 6”, contact factory. Note that the Class (or lb.) designation does not imply a pressure rating. For example, a 3/4” x 1/2” Class 150 PTFE Reducing Full-Face Flange x 1” thick would be SRFT-0.75-0.5-1
NPT Threading: For NPT threaded flanges, add to the Base Part Number the suffix NPT.
Click here for a table showing minimum thicknesses required for NPT threads.
For example, a 2” x 3/4” Class 150 PTFE threaded Reducing Full-Face Flange x 1-1/2” thick would be SRFT-2-0.75-1.5-NPT. See notes link below for minimum thickness required for the threads.
Class 300 (300 lb.) Flanges: For Class 300 flanges, add to the Base Part Number the suffix 300. For other classes, contact the factory. For example, a 2” x 1” Class 300 PTFE threaded Reducing Full-Face Flange x 1-1/2” thick would be SRFT-2-1-1.5-NPT-300
Click here to view the Sizes of Class 150 and 300 Spacers and Flanges.
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