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Amazon.com: M20 to 1/2" Inch NPT thread adapters. ( $8.44 Each - Sold in 10 Packs ) M20X1.5 threads on external side. 1/2" Inch NPT threads on internal side. Nickel plated brass
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Uxcell G9 Light Socket Rings Lamp M20 Shade Holder Adapter Ring White, Zinc Alloy for Light Fixtures, White, Pack of 20 - Walmart.com
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M20 x 1 Thread Ring gage 6g GO NOGO 100% calibrated Ship by FedEx Delivery in 4 Days: Amazon.com: Industrial & Scientific
![ASI 2270430 A20-M20 Ring Terminal, Non-Insulated, 3/0 AWG Fine Strand, 3/4" Stud Size, 3.05" Length (Pack of 20): Amazon.com: Industrial & Scientific ASI 2270430 A20-M20 Ring Terminal, Non-Insulated, 3/0 AWG Fine Strand, 3/4" Stud Size, 3.05" Length (Pack of 20): Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/71+t1B9YBXL._AC_UF894,1000_QL80_.jpg)
ASI 2270430 A20-M20 Ring Terminal, Non-Insulated, 3/0 AWG Fine Strand, 3/4" Stud Size, 3.05" Length (Pack of 20): Amazon.com: Industrial & Scientific
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M20 X 1.5 SPECIAL METRIC THREAD RING GAGE 20.0 GO ONLY P.D.= 18.961MM INSPECTION - M & J Tooling LLC
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M20 X 1.5 6g SPL SPECIAL METRIC THREAD RING GAGES GO NO GO PD'S= 19.024 & 18.854 - M & J Tooling LLC
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SPI - Threaded Ring Gage: M20 x 2.50 Thread, Metric, Class 6G, Go - 75890525 - MSC Industrial Supply
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SPI - Threaded Ring Gage: M20 x 2.50 Thread, Metric, Class 6G, No Go - 75890533 - MSC Industrial Supply
![Uxcell G9 Light Socket Rings Lamp M20 Shade Holder Adapter Ring White, Zinc Alloy for Light Fixtures, White, Pack of 20 - Walmart.com Uxcell G9 Light Socket Rings Lamp M20 Shade Holder Adapter Ring White, Zinc Alloy for Light Fixtures, White, Pack of 20 - Walmart.com](https://i5.walmartimages.com/asr/15b99067-4215-40f2-9391-ab0a9bf9b3b4.5211a2e60503e83de72b13357eff397c.jpeg)