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1/2 x 36 to 5/8 x 24 Barrel Thread Adapter With Thread Protector Stainless #4246 – Down Range Products Company
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Amazon.com: TWP 1/2-36 TPI Thread Protector with 1/2-28 TPI Outside Thread, 1/2x36 TPI Change to 1/2x28 TPI Convertor. + 1/2x28 TPI Thread Protector and a Crush Washer, Aluminum 6061 Anodized Black : Industrial & Scientific
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1/2-36 TPI to 1/2-28 TPI 1-1/2" Long Barrel EXTENSION, Threaded Adapter - SKU#109 - Hughes Precision LLC
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