M18 Metric Thread Dimensions and Pitch
Below are the key dimensions for M18 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.
M18 Coarse (standard) |
|---|
| M18 Pitch: 2.5mm |
| M18 Tap Drill: 15.5mm |
| M18 Clearance Drill: 20mm |
M18 Metric Thread
Step onto our M18 Metric Thread Page, your comprehensive reference for swift metrics on M18 metric threads. We've compiled a broad database for all common metric threads used in your parts, emphasising critical measurements such as thread pitch, tap drill, and clearance drill. This page serves as an all-in-one destination for engineers, machinists, and hobbyists seeking precise and dependable details.
M18 Coarse Pitch Dimensions
| Nominal Size | d=D | p | r | d2=D2 | d3 | D1 | h3 | H1 | Tap Drill |
|---|---|---|---|---|---|---|---|---|---|
| M18 | 18 | 2.5 | 0.361 | 16.376 | 14.933 | 15.394 | 1.534 | 1.353 | 15.5 |
M18 Fine Pitch Dimensions
All dimensions stated in are mm (millimetre)
ISO Metric Thread profile
Glossary
Major Diameter
The Major Diameter is the largest diameter on the thread and is measured from the thread crest to crest (peak of the thread).
Pitch
This is the distance (mm) from one thread to the next, this can be measured from tip to tip or groove to groove. Pitch can also be defined as TPI, which stands for threads per inch.
Minor Diameter
Minor Diameter is the smallest diameter on the thread and is measured from the thread root to root (Bottom of the thread).
Thread Angle
The angle between the thread faces. 60 degrees in the example above.
Right-Hand Thread
The thread will assemble when rotated clockwise. "righty tighty lefty loosely"
Left-Hand Thread
The thread will assemble when rotated counter-clockwise.
Frequently asked questions
What is the pitch of an M18 thread?
What is the tap drill for an M18 thread?
What size is a clearance hole for an M18 thread?
Our services
From 3D printing to CNC machining, we’re experts in manufacturing bespoke precision parts on tight time-frames
Other services
It’s rare you only need CNC machining services. We offer 3D printing, moulding, casting, extrusion, fabrication, assembly, welding & more.
Get your production-ready quote in 24 hours
All projects are reviewed by real engineers to ensure accuracy, catch mistakes and unlock DFM improvements
Working with Get It Made for all our prototyping was an absolute pleasure. Next to immediate response, fast lead times, often arriving before the stated date. Their attention to detail and customer service were second to none. All at the most competitive price point that couldn't be beaten in the UK.
Get It Made are at the top of their game when it comes to reliability and quality. We trust Get It Made to deliver parts on time and within tolerance. We can't speak highly enough of their customer service. Get It Made are quick to reply to enquiries and keep you well informed throughout the whole process.
Get It Made were able to deliver an accurate and quick service delivering a set of high-fidelity prototypes expertly finished, ready for user testing. They offered a range of fabrication options and materials to choose from, tailoring the service to our specific budget, timeframe and material requirements. Can't recommend enough.
Get It Made have over the years been able to take on everything from the simplest to the most complicated of jobs with ease, providing expert advice, good prices and reliable lead times. No job has been too big or too small, either in size or volume. We would strongly recommend Get It Made; you won't be disappointed!
We initially started working with Get It Made, as we needed a high quality product developed within a very short lead time. The entire process went very smoothly and we received the products ahead of schedule. We were pleased with the final results and we found working with Luke very easy, as he offered good technical advice.
When we were looking to have parts manufactured, we had tight deadlines with an even tighter budget. Get It Made understood our constraints and worked with us closely to get our parts to a higher standard than we expected. I cannot recommend Get It Made enough. They are professional, communicative, and the parts are fantastic.
The Get It Made team are very responsive and knowledgeable, fully owning a project throughout, providing superb communication. Transparent pricing structure and rapid quotation turnaround is by far the quickest I've experienced, reducing time to manufacture. Get It Made are a pleasure to work with.
Bespoke quote in 24 hours
Get It Made is proud to provide a human service. Get a quote and free design review by an experienced engineer to see how we make manufacturing simple.