Instant thread identification
Screw each gauge onto a bolt or nut to determine thread size and pitch with reliable accuracy (±0.01mm tolerance), eliminating guesswork in repairs.
- Free shipping
- 14-day easy returns
- Secure checkout
- Quality guaranteed
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Why customers love it
Identify any bolt thread in seconds, every time
This 52-piece dual-system thread checker takes the guesswork out of bolt and nut identification, covering both metric and inch sizes for automotive, motorcycle, bicycle, and general hardware repairs.
- 52 precision gauges cover 24 metric sizes (M2–M20) and 28 inch sizes (1/4”–1”)
- Color-coded red for metric and blue for inch for instant sorting
- Durable aluminum with anodized finish resists rust and wear
- Screw-on testing method identifies thread size and pitch with ±0.01mm accuracy
- Compact, organized case keeps all gauges secure and portable
Why you'll love this thread checker
Color-coded for speed
Red gauges mark metric sizes and blue gauges mark inch sizes, so you always grab the right one fast—even in a busy workshop.
Built for daily use
Durable aluminum construction with an anodized finish resists rust and wear, making this set ready for the garage, shop, or roadside.
Portable and organized
The compact, organized case keeps all 52 gauges secure and portable, perfect for decluttering a mixed parts bin or taking on the go.
Specs
The details that matter
Built to last outdoors, season after season.
- Quantity
- 52 precision gauges
- Metric sizes
- M2–M20 (24 sizes)
- Inch sizes
- 1/4”–1” (28 sizes)
- Material
- Aluminum with anodized finish
- Tolerance
- ±0.01mm
Comparison
Why choose this thread checker set
Not all products in this category are built the same.
Feature
SmartPicksWorld
Typical alternative
Thread systems covered
Both metric (M2–M20) and inch (1/4”–1”)
Often limited to one system only
Gauge count
52 precision gauges
Fewer gauges, less coverage
Color coding
Red for metric, blue for inch
No color coding, slower sorting
Material
Aluminum with anodized finish
Basic materials prone to wear
Accuracy
±0.01mm tolerance
Less precise identification
Our worry-free shopping promise
If your order arrives damaged, defective, or not as described, contact us within 14 days and we will make it right with a replacement or refund.
Frequently asked questions
Everything you might want to know before you order.
How many gauges are included and what sizes do they cover?
This set includes 52 precision gauges: 24 metric sizes ranging from M2 to M20 and 28 inch sizes ranging from 1/4” to 1”.
How do I use the thread checker to identify a bolt or nut?
Simply screw each gauge onto the bolt or nut until you find the one that fits; the screw-on testing method identifies thread size and pitch with reliable accuracy (±0.01mm tolerance).
How do I tell metric and inch gauges apart?
The gauges are color-coded for easy sorting: red gauges are for metric sizes and blue gauges are for inch sizes, so you can grab the right one quickly.
What is the thread checker made of?
It features durable aluminum construction with an anodized finish that resists rust and wear, making it suitable for daily workshop use.
Is the set portable for use outside the workshop?
Yes, the compact, organized case keeps all gauges secure and portable, ready for the garage, shop, or roadside repairs.
Shipping & returns
Shipping
- Delivers to United States (based on your selected country/region).
- Estimated delivery: 3–15 business days after dispatch.
- Shipping cost: Free.
Returns
You can request a return within 14 days after delivery. Standard returns have a €4.00 EUR (approximately $4.66 USD) flat-rate return shipping fee, deducted from your refund. Return shipping is free for items that arrived damaged, defective, or incorrect. Items should be unused and in original packaging where possible. Contact us before sending anything back.