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Mexco  ·  SKU: 137371

Mexco 400mm UNC Extension Bar

400mm UNC extension bar for diamond core drills. 1¼" UNC male-to-female thread gives a secure joint for deep wall and cavity drilling.

£64.72 each, ex VAT
£77.66 inc VAT
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Why it works

Why choose this extension bar

Extra reach for deep coring

Adds 400mm to your diamond core drill's working length for deep wall and cavity drilling.

Secure threaded connection

The 1¼" UNC male-to-female fitting keeps a firm, stable joint through the full drilling depth.

Built for wet coring

Works with wet diamond core drilling accessories on masonry and construction sites.
Overview

Mexco 400mm UNC Extension Bar - Overview

The Mexco 400mm UNC Extension Bar extends the working length of a diamond core drill for deep wall penetrations and cavity wall drilling. It fits any diamond core bit with a 1¼" UNC connection, giving a secure threaded joint over the full extended length.
400mm
Extension length
1¼"UNC
Thread fitment
Dimensions
Length400mm
Details
Fitment1¼" UNC Male to 1¼" UNC Female
Compatible bitsAny 1¼" UNC diamond core drill bit

Frequently asked questions

What thread does the 400mm extension bar use?
It has a 1¼" UNC male to 1¼" UNC female threaded connection, matching the standard fitment used on diamond core drill bits and core drilling machines.

How much extra depth does the 400mm bar give me?
It adds 400mm to your core bit's working length, useful for deep wall penetrations and cavity wall drilling where a standard bit falls short.

Is it compatible with my existing core bit?
Yes, provided your core bit uses a 1¼" UNC fitment. This is a standard connection used across most diamond core drilling equipment.

Does the extension affect drilling stability?
The threaded connection is designed to hold a firm, stable joint so drilling accuracy and power transfer are maintained over the extended length.

Can I use this for wet core drilling?
Yes, it is built to work with wet diamond core drilling accessories on masonry and construction sites.

Can two extension bars be joined together for extra reach?
Each bar has one UNC male and one UNC female end, so bars can be connected in sequence if you need more reach than a single 400mm bar provides.

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