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.

Makerele Cord Grip Npt Cable Glands Kit For Electrical Waterproof

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Description

💼 Elevate your electrical game with waterproof precision and pro-grade versatility!

EFFORTLESS INSTALLATION - Thread, tighten, and lock—no disassembly needed for a secure, strain-free fit
PREMIUM NYLON DURABILITY - Crafted from high-strength PA66 nylon for long-lasting resistance against chemicals and wear
WIDE CABLE COMPATIBILITY - Fits cables ranging from 0.10 to 1.2 inches, making it your go-to for diverse wiring tasks
ALL IN ONE CABLE GLAND KIT - 50pcs covering 6 NPT sizes from 1/4” to 1-1/4” for every project need
UNMATCHED WATERPROOF PROTECTION - IP68 rating ensures reliable underwater and outdoor use without compromise

The MAKERELE Cord Grip NPT Cable Glands Kit offers 50 high-quality nylon PA66 cable glands in six NPT sizes, designed for waterproof (IP68) and chemical-resistant applications. Ideal for professional electrical projects, it supports a wide cable size range and features easy installation for secure, durable cable management indoors and outdoors.

Specifications

ASIN	B08R86BHBC
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#8,918 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Electrical Conduit Fittings
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (1,486)
Date First Available	December 24, 2020
Is Discontinued By Manufacturer	No
Item Weight	1.86 pounds
Item model number	NPT(50)Box6A-B
Manufacturer	Yueqing Maker electric Co.,ltd
Material	nylon
Product Dimensions	10.83 x 6.5 x 2.17 inches
Size	50pcs KIT BOX

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