Why does 1/2 npt require hole size of 21.5 mm or .84" ? such confusing specs/statements abound

NPT or National Pipe Thread Standard sizes can be a bit confusing. 1/2" NPT is not 1/2" diameter. Nor is it the I.D. as others have stated. Hole size will always be greater than the NPT nominal diameter callout.

what is the length of the threaded portion of these glands (useable with nuts) how thick of a mounting surface can these be used on.

Only good for a standard electrical box or about a1/8 th of an inch. For some of my thicker boxes I did tap the with a pipe thread so they would screw in.

Why is the cable range of the 1 1/4 inch (~32mm) listed as max range 25mm?

I believe that if you go to the manufactures web site,that maybe the biggest cable gland that they make. There are other manufactures that make cable glands in larger sizes.

what size do I need for a hole that is 3/8 inch in diameter

Your question needs more information. I believe you are saying is that your 3/8" cable,coax or tubing is that size of 3/8" correct? Now the hole size for the Makerele NPT Cable Gland Kit for 3/8" needs to be 5/8" or .625 in.,the Gland thread end is a little bigger in size of .630 in.,that is .005 larger than 5/8",so you will be fine there. It will fit,due to the plastic of the threads.

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🔌 Secure your cables like a pro—never compromise on protection!

BUILT TO LAST - Premium nylon PA66 ensures robust, long-term strain relief.
WATERPROOF CONFIDENCE - IP68 rating means your connections stay dry—even underwater.
EFFORTLESS INSTALLATION - Thread, tighten, and lock—no disassembly required.
WIDE CABLE COMPATIBILITY - Fits cables from 0.10 to 1.2 inches for ultimate flexibility.
ALL IN ONE CABLE SOLUTION - 50pcs in 6 NPT sizes cover virtually every cable need.

The MAKERELE Cord Grip Cable Glands Kit offers 50 high-quality nylon PA66 cable glands in 6 NPT sizes, designed for versatile electrical applications. With an IP68 waterproof rating, these glands provide superior protection against water, salt, acids, oils, and solvents. Compatible with a wide range of cable diameters (0.10-1.2 inches), they ensure easy, secure installation without disassembly, making them ideal for both indoor and outdoor electrical projects.

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Manufacturer	Yueqing Maker electric Co.,ltd
Country of Origin	USA
Item model number	NPT(50)Box6A-B
Product Dimensions	27.5 x 16.5 x 5.5 cm; 845 g
ASIN	B08R86BHBC

MAKERELE Cord Grip Cable Glands Kit for Electrical Box NPT Waterproof Nylon Strain Relief 1/4” 3/8” 1/2” 3/4” 1” 1-1/4” 50pcs Junction case Connector Black With Gaskets

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