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U.S. to METRIC- Barrel Adapter Thread Converter U.S. 1/2" x 36 (female) to M13.5 x 1 LH (male) - SKU#087 - Hughes Precision LLC
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1/2-36 TPI to 1/2-36 TPI Barrel EXTENSION, Threaded Adapter .7 (3/4") Length - SKU#084 - Hughes Precision LLC
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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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1/2 x 36 to 5/8 x 24, 5/8″ long 9MM Shoulderless Barrel Thread Adapter Black #4102 – Down Range Products Company
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