What size hole do these need for best strength (width in mm?)

This will depend somewhat on your printer settings and material properties, but a hole tapering from 5.23mm to 5.05mm diameter, depth 3.89mm should be a very good starting point.

What is the best hole size to get good retention?

On my prints, I have been using 5.60 mm (0.220 inches). with 1.50 inch depth for the short inserts and 0.250 inches for the longer inserts. It has worked quite well- easy to place the insert on top and sinks down in 1-2 seconds with a soldering iron. Depending on your screw/bolt length, you might consider add a deeper, smaller hole below the insert so the screw doesn't bottom out.

What is the length of this product? i am looking for m3 x 0.50 mm thread size, 3.800 mm installed length

Please see the dimensions on the drawing (one of the product images). OAL is 3.81mm

How long is this produsct from top to bottom? i'm hoping for m3 x 0.50 mm thread size, 3.800 mm installed length

The pieces that I reveived are 3.85mm, 0.1515" +/- a few thousands.

[initeq] M3-0.5 Threaded Heat Set Inserts for 3D Printing (100, Short)

[initeq] M3-0.5 Threaded Heat Set Inserts for 3D Printing (100, Short)

Product ID: 378637314

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Details

Material
Brass
Fastener type
Insert
Exterior finish
Brass
Colour
Gold
Metal type
Iron

📦Pack of 100 inserts

🔥Heat-set for permanent bonding

🔩M3-0.5 precision threading

Description

🔩 Upgrade your 3D prints with metal-strong threads — don’t get left behind!

BULK PACK OF 100 - Ample supply to power multiple projects without interruption
HEAT SET INSTALLATION - Easily embed metal threads with heat for a durable, permanent hold
PRECISION M 3 0 5 THREADS - Engineered for exact fit and reliable fastening in your 3D prints
ENHANCE 3 D PRINT STRENGTH - Transform fragile plastic parts into robust, functional components
PROFESSIONAL GRADE FINISH - Achieve clean, industrial-quality threaded connections every time

The initeq M3-0.5 Threaded Heat Set Inserts provide a reliable and permanent metal threading solution for 3D printed parts. Designed for easy heat-set installation, this pack of 100 short inserts enhances the durability and functionality of your prints, making them ideal for professional-grade prototyping and production.

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