Kidney Hole - Up to 7.00mm diameter
Kidney Hole - Up to 7.00mm diameter
- Maximises coolant flow area in small-diameter drills where space is extremely limited
- Maintains reliable chip evacuation at diameters where blockage risk is highest
- Preserves structural strength of the tip despite the small cross-section
- Enables deep hole drilling at diameters as small as 3.00mm with consistent performance
- Optimised geometry prevents heat build-up at the cutting edge in small bores
- Reduces risk of drill breakage compared to designs that over-compromise tip material for coolant passage
We’re currently working on enabling direct online ordering for your convenience. Soon, you’ll be able to place orders directly on our website.
In the meantime, please use the enquiry form or contact us via email or phone to place your order. We appreciate your patience.
Email: info@hammco.com
Tel: +44 (0)1442 212211
Before drilling commences the gun drill must be suported by a guide bush or pre-drilled start hole. Coolant is delivered directly to the cutting edges through the hollow shank and the chips are evacuated back along the V configuration of the tip and shank.
The periphery of the cutting tip is contoured in such a way as to provide both support pads and lubrication galleries. The forces generated by the single sided cutting action act directly on the support pads creating a burnished surface finish and size control down to IT7 tolerances.
Gun drill tips can be manufactured with a step that has either a cutting, or non cutting pilot. Coated tips are also available upon request. These may have a TiN (Titanium Nitride) coating, or a TiAlN (Titanium Aluminium Nitride) coating.
A regrinding service is available at our Hemel Hempstead factory for gun drills, Ventec drills and Speedfeed drills.
Hardened steel guide bushes and whip guides are available for purchase. See accessories. accessories.
What Makes Hammond & Company Different?
A world leader in deep hole drilling products with state-of-the-art manufacturing and internationally recognised expertise.
85+ Years
Three generations of UK craftsmanship
+0/-0.005mm
Guaranteed accuracy on every drill
Worldwide Delivery
Express shipping available
Lifetime Support
Expert technical assistance included
