HEX threading bit for threading rods and screws – Quick repair of damaged threads
Do you often damage threads while working in the workshop? Hitting the end of a connecting rod with a hammer, cutting a threaded rod to the desired length, or knocking a drive shaft out of the hub often results in torn, broken, and unusable threaded ends. Instead of wasting time filing by hand or buying new expensive screws, use a professional HEX bit to deburr the edges of threaded rods and screws.
This indispensable screw bit allows you to remove pins and file the edges of damaged screws, wheel bolts or threaded rods in seconds. Using a standard cordless drill or screwdriver, you can have damaged parts ready for use again in just a few turns. It is the perfect tool for fast, safe and extremely effective thread restoration.
Why choose a HEX edge trimming attachment?
When the thread is damaged, installing the nut is almost impossible. This innovative adapter acts as a conical metal funnel equipped with three extremely sharp carbide steel blades. When the bit is clamped into the drill and pressed against the damaged end of the screw, the blades precisely remove excess material and create a perfect bevel (cut) that allows the nut to be screwed in smoothly.
Its versatility makes it an indispensable tool in auto repair shops, metal and woodworking, toolmaking, stonemasonry, construction, and everyday home projects. It is suitable for a wide range of materials - from soft wood to hardened steel.
Key benefits of use

Save time and money: Forget about time-consuming manual thread filing or buying new screws. Repair damaged screws in seconds and reuse them immediately.
Universal use on various materials: The attachment is extremely effective on stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood and hard plastic.
Easy to use with a drill: All you need is a classic cordless drill or screwdriver. Simply insert the bit into the drill head and start working.
High durability: The cutter body is made of high-strength and hard steel, and the three carbide blades ensure long service life and a clean, smooth cut without effort.
Safe work: Unlike using an angle grinder (flexible grinder), this attachment does not cause sparks, overheating of the material or the risk of cuts.

Technical specifications and features

Chuck type: Standard HEX 1/4" chuck (hexagonal quick-release chuck)
Working diameter: Suitable for screws and rods with diameters from 3 mm to 19 mm
Working depth: 12 mm
Total height of the attachment: 49 mm
Blade material: High-quality carbide steel (carbide)
Housing material: High-strength hardened steel
Compatibility: Suitable for use with cordless and electric drills
Product code (SKU): M55877, WMG0319 or G15035

Instructions for safe and effective use
To achieve the best results and extend the life of your blades, follow these steps:

Clamp the HEX bit into the head of your cordless or electric drill.
Set the drill to the lowest rotation speed (low rpm).
Position the attachment vertically on the damaged end of the threaded rod or screw.
Apply moderate and gentle downward pressure while the drill is rotating to ensure the blades evenly carve the edge and remove any burrs.
Once the edge is smoothed, simply screw the nut back into place.

Frequently Asked Questions (FAQ)
1. What materials can I use this attachment on?
This attachment is extremely versatile. You can use it on stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood and hard plastic.
2. What diameter of screws can I repair with this tool?
The bit is designed to work with screws and threaded rods with diameters from 3 mm to 19 mm, covering most standard screw sizes used in everyday practice and workshops.
3. How to prevent premature wear of carbide blades?
The key to long tool life is to use it at low RPM (the slowest speed on the drill) and moderate pressure. Spinning too fast can cause overheating and faster wear of the blades, especially when working with hard materials such as hardened or stainless steel.


Responsible persons:
MAR-POL - MAR-POL SCIMPORT EXPORT M.ŚCIANA, K.ŚCIANA, 26-020 Chmielnik, Suchowola 6a, Poland, obsluga@mar-pol.sklep.pl, +48607865357
Distributor for Slovenia: Haloorodje.si, Online Sales, Rok Groznik sp, Podturn 42, 8350 Dolenjske Toplice, info@haloorodje.si, +38669731944, Slovenia
Product origin: China

DEDRA - Dedra-Exim Sp. z o. o. ul. 3 May St. 8, 05-800 Pruszków, Poland, sklep@dedra.pl (+48)22 738 39 89
Distributor for Slovenia: Haloorodje.si, Online Sales, Rok Groznik sp, Podturn 42, 8350 Dolenjske Toplice, info@haloorodje.si, +38669731944, Slovenia
Product origin: China

GEKO - GEKO SPÓŁKA Z OGRANICZNĄ ODPOWIEDZIALNOŚCIA SPÓŁKA KOMANDYTOWA, ul. Spacerowa 3, 97-500 Kietlin, Poland, (+48) 446824004, geko@geko.pl
Distributor for Slovenia: Haloorodje.si, Online Sales, Rok Groznik sp, Podturn 42, 8350 Dolenjske Toplice, info@haloorodje.si, +38669731944, Slovenia
Product origin: China

Instructions for using the product:
• Before use, inspect the HEX threading bit for damage.
• Insert the bit into the appropriate HEX chuck of a cordless or electric screwdriver or drill.
• Check that the attachment is correctly and securely attached.
• Secure the threaded rod or screw securely or hold it so that it cannot move uncontrollably during processing.
• Place the adapter on the damaged or cut end of the thread.
• Start the tool at low speed and press the bit lightly onto the end of the thread.
• Guide the bit evenly until the burr is removed and the initial part of the thread is restored.
• Repeat the process if necessary, but do not remove more material than necessary.
• After finishing work, switch off the tool and wait until the attachment has come to a complete stop.
• Remove the attachment, clean it of metal filings and store it.

Useful tips for work:
• The attachment is intended for removing burrs and imitating damaged thread starts on threaded rods and screws.
• HEX shank allows for quick use with a compatible cordless screwdriver or drill.
• Use the lowest appropriate speed when working to have better control over the processing.
• Before use, check that the bit is suitable for the diameter and type of thread you want to process.
• If the thread is severely damaged, the bit cannot always restore the entire thread; in such a case, use a suitable threading tool.
• Remove metal filings after processing with a brush, not with bare hands.
• Keep the attachment clean and protected from moisture.

Warnings:
• CAUTION – rotating attachment and metal filings can cause injury.
• Always wear safety glasses and, if necessary, protective gloves.
• Secure the threaded rod or screw properly so that it does not rotate or move during processing.
• Always turn off the tool and remove the battery or disconnect the power supply before changing the accessory.
• Do not use a damaged or deformed attachment.
• Do not use the attachment as a chisel or grinding tool.
• Do not remove metal filings with your hands.
• Do not exceed the permissible speed of the attachment or the power tool used.
• After working, the attachment and workpiece may be hot – wait until they have cooled down before touching them.
• Keep the product in a dry place and out of the reach of children.

Same summary

The HEX bit for chamfering threaded rods and screws is suitable for DIYers who need a simple solution for preparing threads before screwing or restoring old threaded connections. Thanks to the bit holder and larger diameter (over 13 mm), it is effectively used for more robust work on metal or wood, but it is primarily a sensible choice for those who clearly know that they need exactly this type of tool. It may not be the best choice for regular universal screwing or basic tasks, as it is a more specialized accessory. It is important for the user to check the compatibility with their power tool and suitability for the material used, as the wrong bit can make the job more difficult or even cause injury.

Recommendation source: Enaa guides and team experiences.

User view

This type of attachment is most often used by users who are faced with making or restoring threads on thick metal or wooden rods and screws, where precise edge preparation is essential for safe and easy assembly. In practice, it is especially useful in home workshops, garden repairs, restoring older machinery or in projects where adjusting and finishing threads is a common need.

When choosing, they are often attracted by the reliability of the Mar-Pol brand, which is known among users for its robust and reliable solutions for working with power tools.

Why buy at Enaa

At Enaa you can quickly compare a wide range of attachments and find the technically appropriate product for your job, as all key information is clearly marked. Our team regularly updates the catalog and ensures accurate descriptions, which helps even with more complex decisions. If you are in doubt, professional help and practical advice are available to make the purchase as easy as possible.

Answers to frequently asked questions

For which materials is this HEX bit best suited?

The HEX threading and screw chamfering attachment is best suited for use on metal and wooden rods and screws with larger diameters. Before use, check the suitability of the material for your job.

Is the attachment suitable for use with all power tools?

Most standard electric screwdrivers and drills with a HEX holder can use this type of bit, but make sure it is compatible with your tool before using it.

Is there any special care required to maintain this attachment?

The attachment does not require any special maintenance, but it is recommended to clean it regularly after use and store it in a dry place to prevent corrosion or accumulation of material between the blades.

What is the difference between a regular attachment and an edge trimming attachment?

The edge trimming attachment is specially designed to remove sharp edges or damage to the thread of rods and screws, making further screwing or assembly easier, while conventional attachments are mainly used for screwing and unscrewing screws of various profiles.

Description updated: April 2026