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.

Cord Grip Npt Cable Glands Kit For Electrical Waterproof Box

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Description

🔌 Secure your cables like a pro—durability meets precision in every grip!

BUILT TO ENDURE - Crafted from premium nylon PA66 for superior strength and longevity in demanding environments.
WATERPROOF CONFIDENCE - IP68 rating ensures reliable protection even underwater or in harsh chemical exposures.
EFFORTLESS INSTALLATION - Thread, tighten, and lock—no disassembly needed for a secure, strain-relieved connection.
ALL IN ONE CABLE SOLUTION - 50pcs across 6 versatile NPT sizes to fit nearly any cable diameter.
UNIVERSAL CABLE COMPATIBILITY - Supports cables from 0.10 to 1.2 inches, covering a broad spectrum of project needs.

The MAKERELE Cord Grip Cable Glands Kit offers 50 high-quality nylon PA66 cable glands in 6 NPT sizes, designed for waterproof (IP68) and chemical-resistant strain relief. Ideal for electrical boxes, machinery, and outdoor applications, it supports a wide cable range and ensures quick, tool-free installation for professional-grade cable management.

Specifications

Manufacturer	Yueqing Maker electric Co.,ltd
Item Weight	845 g
Product Dimensions	27.5 x 16.5 x 5.5 cm; 845 g
Item model number	NPT(50)Box6A-B
Size	50pcs KIT BOX
Color	Black
Material	nylon
Batteries Included?	No
Batteries Required?	No

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NZ$130

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

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TrustScore 4.5 | 7,300+ reviews

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Cord Grip NPT Cable Glands Kit for Electrical Waterproof Box

Description

Specifications

Common Questions