Send your size, grade and quantity – we'll advise the right process.
Ask our team →Firmly established, serving many sectors of industry with a service second to none. ISO 9001 approved.
Our StoryTapping Services – Garnstone Ltd
Horizontal TappingIrregular & large components
Heavy Duty VerticalM30 – M90 twin-spindle
Multi-Spindle VerticalM24 – M60
Standard & oversize re-tapping and blank tapping for industrial fasteners – with a fast, friendly response irrespective of the size or value of your enquiry.
Nuts, couplers & connectorsTwin-spindle heavy duty vertical machines up to M90, multi-spindle machines from M24 to M60, and horizontal tapping for large or irregular components.
Heavy duty vertical tappingDrilling of nut flats to Hydratight™ specifications and spherical facing to Gray Tool™ specifications – in high temperature and corrosion resistant alloys.
CNC turning & threading
Polygon turning converts round components into hexagons or any even-sided shape up to twenty-four sides, up to 100 mm across flats and 200 mm long.
Polygon turning machine
Slide to your thread diameter to see which of our services cover it.
Firmly established for more than 40 years, we provide solutions for customers from many different sectors of industry. Whether it's a single urgent nut or a full production batch, we guarantee a fast and friendly response – and if it's simply help or advice you need, we'll be more than happy to oblige.
From standard nut tapping to petrochemical bolting grades, high temperature and corrosion resistant alloys.
Tapping and re-tapping, standard and oversize, with oversize capability for hot dip & hi-temp galvanising, PTFE coating, sheradising and electroplating.
M5 – M100 ~ 3/16" – 4.00"To Hydratight™ specifications, ASTM A194 2H, 4, 7, 8M grades.
M16 – M100
Bolt extensions & couplers (LH/RH), special hex & round nuts, plate washers, J-bolts & ground anchors.
M30 – M100 ~ 1.1/8" – 4.00"Hex & round nuts, studding connectors, ground anchors and J-bolts – plus modifications to your existing components.
Hover a machine to learn what it handles – from M24 multi-spindle work to heavy horizontal tapping above M90.
For symmetrical & irregular components that can't be hopper fed. Diameters over M90 are usually tapped horizontally.
Twin-spindle machines with neat cutting oil flooded on the taps – the type used by traditional nut & bolt makers.
Quick to set up with consistent, reliable results on high tensile & corrosion resistant grades.
High accuracy and excellent surface finishes, with modern Local Exhaust Ventilation.
Converts round parts into hexagon or any even-sided shape up to 24 sides, 200 mm long.
Standard nut re-boring & re-tapping, thinning (0.5 – 0.8 x Ø) and re-facing, re-chamfering and spherical facing – plus full manufacture of hex, square & round nuts from billets, forgings or bar stock.
Hexagonal nuts, square & round components, octagonal parts and double-sided flats – even shapes up to 24 sides, up to 100 mm across flats. Ideal for hexagonal connector nuts.
Coated components need the correct oversize tapping so nuts and bolts still assemble. Our Technical section gives you a formula to calculate the oversize tapping dimension you need.
Tapping facility, CNC machining and manufacture – all under one roof in the West Midlands.
Decades of tapping and re-tapping for every sector of industry.
An approved quality system behind every component we process.
Quick, friendly replies to every enquiry, whatever its size or value.
High temperature, corrosion resistant & petrochemical bolting grades.
Call, email or use the form with size, grade & quantity.
A clear quotation and technical advice if you need it.
Tapped, drilled or machined under our quality system.
Ready to use – with a hotshot option for emergencies.
Quick answers to common questions – visit our FAQ page for the full list.
Galvanising deposits zinc inside the thread as well as on the outside of the component. Read the full answer →
Our Technical section includes a formula for calculating the oversize tapping dimension. See Technical →
We explain the differences in detail on our FAQ page. Read the full answer →
Yes – we operate an ISO 9001 approved quality system. More details →
Call us on 01902 404882 to discuss urgent and breakdown work. Read the full answer →