Excellent 4.8 | 12,000+ Trusted Reviews

ZirlyFix Pro Nut and Bolt Thread Checker

ZirlyFix Pro Nut and Bolt Thread Checker

Includes 44 Precision Sizes

☑ Precision-Machined for Accurate Thread Identification

🔵 Metric Thread Sizes (Blue-Coded)

🔴 SAE Thread Sizes (Red-Coded)

⚙️ Precision Fit — No More Guessing

🧰 Portable Case, Built to Last
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ZirlyFix Pro Nut and Bolt Thread Checker

ZirlyFix Pro Nut and Bolt Thread Checker

 4.5 out of 5 stars

Does this work with both Metric and SAE sizes?

Yes. ZirlyFix Pro includes both Metric (blue) and SAE/Inch (red) thread sizes, making it compatible with most bolts and nuts used in automotive, home, and industrial applications.

Is this accurate enough for professional use?

Absolutely. Each thread is precision-machined for reliable identification, making it suitable for mechanics, workshops, and serious DIY users.

What materials is it made from?

The threads are made from durable aluminum alloy, designed to resist wear and provide consistent accuracy over time.

How do I use the thread checker?

Simply screw your nut or bolt into the matching thread until it fits smoothly. The clearly labeled sizes allow for fast, mistake-free identification.

 
 
 
 

Why they LOVE ZirlyFix Pro

Based on 12,000+ reviews

  • ★★★★★

    No More Guessing at the Hardware Store

    I work on cars and motorcycles regularly, and this thread checker has already saved me a lot of time. The color-coded metric and SAE threads make size identification quick and easy. The aluminum threads feel solid, and the organized case keeps everything in place. A genuinely useful tool for any garage.

    Mike R., Mechanic

  • ★★★★★

    Perfect Tool for DIY Projects

    As a DIY homeowner, this made identifying nuts and bolts incredibly simple. No more guessing or extra trips to the store. The markings are clear, the build feels durable, and it’s very easy to use even without professional experience. Great addition to any toolbox.

    David M., Home DIYer

  • ★★★★★

    Well Built and Worth It

    I added this to my workshop and was impressed by the accuracy and build quality. The color coding speeds things up, and the range of sizes covers almost everything I need. It feels professional and far better than cheaper alternatives.

    Marc L., Workshop Owner

     
     
     
     

    Why is ZirlyFix Pro... THE BEST?

      Others

    Cable-Free

    Go/No-Go

    Portable

    Complete

    Laser-Etched

    Will this help avoid buying the wrong hardware?


    Yes. By identifying exact thread size and type, ZirlyFix Pro helps you avoid costly mistakes and return trips to the hardware store.


    How long does shipping take?

    Orders are typically processed within 1–3 business days.

    Shipping times vary by location, but most orders arrive within 5–8 business days.

    Does this product require assembly?

    No assembly required.

    ZirlyFix Pro is ready to use straight out of the box.

    What is your return policy?

    We offer a 30-day satisfaction guarantee.

    If you’re not happy with your purchase, you can return it for a refund or replacement.