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Steam Engine


Boiler & Crown STAY TAPS

T-TECH is the sole UK Manufacturer of STAY TAPS & at the forefront of precision cutting tools for the Railway Restoration industry.

We offer a thorough & bespoke service from enquiry and advice through design and manufacture.



Boiler & Side Stay taps

Crown Stay taps

Washout Plug taps

Set Screw/Patch screw taps

Thread cleaning & Dome-faced Dies & Dienuts

Counter Sinks

Seating cutters


& Much more


You will speak with an Engineer who understands the application and design of steam railway taps.


We will request the necessary information required to manufacture a working solution for your restoration needs.


Our capacity allows us to manufacture STAY TAPS with any diameter and length; this includes any non-standard thread form or tapers.


We aim to have a full design proposal with you within 2 working days of your enquiry.

Our expertise in cutting geometries ensures our taps cut freely, reducing the possibility of binding or ripped threads.

We employ our understanding of stay tap function & design to ensure our design is optimal whether cutting new or cleaning existing threads.


All our products are manufactured in our UK facility.


We manufacture in Vacuum Hardened HSS & thread-grind to ensure optimal hardness, durability and surface texture.

All our products undergo thorough inspection post-manufacturing to ensure superior quality and performance.


Upon receiving your enquiry we aim to have outlined a full proposal and quotation within 2 working days

Once finalised, we commence manufacture in our Birmingham Facility allowing us to realise your solution in as little as 5 working days.  

STAY REPAIR_edited.jpg

Severn Valley Railway repairing a steam locomotive boiler using one of our stay taps.

Dome-faced Dies & Dienuts


Dome faced Hexagon Dienuts manufactured in HSS for finishing, cleaning and repair of existing threads.

Body dimensions manufactured to your required specification.

Unique cutting geometry & lead chamfer optimised to suit your specific application.

All threadforms & pitch diameter combinations available

Manufactured in both Right & Left Hand

Railway Taps (incl. TAPER)


Bespoke ground thread railway taps manufactured in HSS or HSSE to suit your requirements.

Typical examples include SET SCREW TAPS, PATCH SCREW TAPS, WASHOUT PLUG TAPS & many more styles.

Diameter 2-200mm+ 

Any thread form; including tapered (BSPT/NPT ETC)

Any Taper ratio e.g 1:8, 1:25 etc

Lead length as desired

Custom dimensions (incl. shank diameter & various lengths)

Tap geometry to suit material application

Thread upright to taper or upright to square

Non-standard thread forms

Non standard pitch-diameter combinations.

No minimum order quantity!


If you cannot find what you are looking for listed above please visit our Product Enquiry Page

or ring (+44) 0121 474 2255 

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