









Nut and Bolt Thread Checker
- Feature
- ✅ Quick measure various types of screws, nuts, bolts, and threads
- ✅ Accurate size identification, make them easy to store
- ✅ Easy to read and operate with clear markings
- ✅ Allumiumn alloy and stainless steel material for durable use
- ✅ Hanging on the wall or flat placing


Why Choose iToolMax?
🚚Fast, Free Shipping
Free shipping on all items to most locations nationwide.It usually takes 4-7 business days for your package to be delivered, so you can sit back and relax, worry-free.
🔙30-Day Risk-Free Trial
Try it worry-free! Full refund within 30 days if you’re not satisfied.
🔄1 Year Warranty
We provide a one-year warranty to every customer who purchases our products, so you can use them with peace of mind!
🤛Lifetime Customer Support
We'll Always be There for You. If you have any questions or concerns, feel free to contact us at support@itoolmax.com or online chat.
♻️ Safe Payment & Secure Privacy
All data is encrypted.Your information will be kept secured.Protecting your privacy is important to us!
✅ Trusted by 150,000+ Customers
Verified by real users—shop with confidence and ease.


Your Go-to Tool for Nut & Bolt Identifying! 📏
Quickly identify confusing bolt and nut sizes with our Nut and Bolt Thread Checker, classify them neatly and store them for easy repair and maintenance work! Suitable for craftsman, engineers, and DIY enthusiast or hobbyist.

Precise Measurement
Simplify your projects by quickly verifying thread pitches, bolt sizes, and more with ease. Compact, durable, and easy to use, this thread checker is a must-have for workshops, garages, and toolboxes.

28/44 Holes Options
28 Holes: M4 x 0.7 to M14 x 2.0 metric threads and 6 - 32 coarse threads to 1/2 - 20 fine standard threads sizes.
44 Holes: M3 x 0.5 to M24 x 3.0 metric threads and 6-32 coarse to 1-12 fine standard threads sizes.

Aluminum Alloy & Steel Material
Made of CNC machined anodized aluminum alloy 6061 and SUS304 stainless steel, meet Go & No Go Class 2B ANSI standards for both internal and external threads. With a protective anodized finish, the laser etched markings will not fade or scratch off.