Do you need to use grease?

Me? More and more these days..... However, I am to delighted to confirm that with reference to the threading tool, you can keep your hands clean - no grease required.

Can you rethread the same screw hole twice?

It is possible to try the re-threader then try the bolt. It depends on the depth of thread (how thick the metal is) and it’s condition. If its a poor fit I would try a 4mm Tap or consider re drilling and tapping to take a 4•5 or 5mm bolt. There are other alternatives but I don’t want to go on and on. I hope this helps.

which one would i need for back box?

Hello, you would need our 3.5mm variant to do this. Part code 495028 - https://www.amazon.co.uk/CK-495028-Re-threading-Tool-M3-5x0-6/dp/B001KVJFDG/

Is this suitable for rethreading the holes underneath a Ring doorbell, please, the two screws underneath, have lost their thread. Thanks,

This tool is for cutting threads in electrical back boxes made from steel, either because the thread is damaged in some way, or the box is very old and the thread size is mperial which is not compatible with modern electrical sockets and switches. If the damaged thread in your Ring fitting is less than M3.5, it may work, but an alternative could be to use some self tapping screws of a suitable size.

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C.K 495029 Re-Threading Tool

Product ID: 57333413

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Details

Material
Alloy Steel
Fastener type
Speed
Thread size
M 4
Exterior finish
powder-coated
Metal type
Alloy Steel
Finish type
Powder Coated

⚡High-speed steel tap

📏50mm long tap length

🛠️Impact-resistant handle

Description

🛠️ Thread Like a Pro, Finish Like a Boss

CLEAN CUTS EVERY TIME - High-speed steel tap delivers sharp, clean cuts that extend tool life and reduce rework.
OPTIMIZED FOR M 4 THREADS - Specifically engineered for M4 size with 0.7mm pitch, perfect for electrical conduit access covers and precision repairs.
REACH DEEPER WORK SMARTER - 50mm long tap length provides improved access to hard-to-reach threads, making your workflow seamless.
PRECISION THREADING MASTERY - Experience flawless, accurate threading with precision ground threads designed for professional-grade results.
BUILT TO LAST BUILT TO PERFORM - Tough impact-resistant handle ensures durability and comfort during intensive use—no compromises on grip or control.

The C.K 495029 Re-Threading Tool is a precision-engineered alloy steel tap designed for clearing and restoring M4 threads with a 0.7mm pitch. Featuring a durable impact-resistant handle, high-speed steel cutting edges, and a 50mm long tap for enhanced reach, it ensures clean, accurate threading ideal for electrical conduit access covers and professional maintenance tasks.

Specifications

Manufacturer	C.K
Part Number	495029
Product Dimensions	2.31 x 7.01 x 19.51 cm; 40 g
Item model number	495029
Size	M4.0
Finish	Powder Coated
Material	Alloy Steel
Item Package Quantity	1
Number of Pieces	1
Head Style	Cross-shaped
Included Components	1 x 495029
Batteries included?	No
Batteries Required?	No
Battery description	Not Included
Item Weight	40 g