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Product Index > Spacers, Flanges & Gaskets > Spectacle Line-Blinds > PTFE Lined Steel > Item # 9  

Item # 9, 4" PTFE Lined Steel Spectacle Line-Blinds

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SLBS Series PTFE Lined Steel Spectacle Line-Blinds

Standard Class 150 (150 lb.) Spectacle Line-Blinds

Base Part Number: As shown below, the BASE PART NUMBER defines the Series (four characters), the nominal size, and the thickness TH. Use a decimal number to indicate the nominal size. 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 standard 3/4” Class 150 PTFE Spectacle Blind would be SLBS-0.75-TH


Class 300 (300 lb.) Spacers: For Class 300 spacers, add to the Base Part Number the suffix 300. For other classes, contact the factory. For example, a 2” Class 300 PTFE Spectacle Line Blind x 1-1/2” thick would be SLBS-2-1.5-300

Click here to view additional notes and a graphical part number key


Nominal Pipe Size


Part Number




Overall Diameter (OD)


Steel Plate Thickness


Bolt Hole Diameter (B)


Bolt Hole Radius (R)