Why doesn't the metric include 18mm?

Did not notice ! But am very disappointed that the 18mm sizes are missing from the metric ser as well as the 7/8 sizes are missing from the SAE/inch setcolete sets. I plan to call Thread Checker on it.

18mm and 7/8 sizes are not included? Can the seller/maker explain that & do you have another set which includes them?

I've been talking with the company requesting additional checkers to add to the ring. The ones that are skipped are: M18-2.5, M14-1.25, 7/8"-9, 7/8"-14, and #8-36 sizes. Technical support told me they will pass this info "up the ladder", so I'm hopeful. These last few checkers would make this the PERFECT set.

Why is #12-24 also missing?

Your right it is not included. That size is not available either.

how do they detach from the cable so you can check things like holes on the side of an engine block if you don't want to stick the chain down there?

I used split ring key chains to attach to each gauge and then added all to large split ring. 5/8" for small gauges, 7/8" for large size. then added to either a 2" for a Metric- S.A.E. or for one ring combined I used a 3" split ring. This is a way that each gauge can be removed and returned when needed. Enjoy!

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Thread Checker Nut and Bolt (Complete SAE/Inch and Metric Set) (Packs)

Product ID: 390629452

📏Permanent size stamping

🔩44 total sizes covered

⚙️Dual SAE & Metric gauges

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Description

🔧 Unlock every thread with precision and style!

TRUSTED BY PROS - Ranked #666 in Hardware Nuts & Bolts—join the elite users
INSTANT THREAD ID - Nut and bolt checker on every gauge for rapid matching
COMPACT PORTABLE - Lightweight 1.16 kg design fits perfectly in any toolbox
ALL IN ONE PRECISION - Master 23 SAE & 21 Metric sizes in one sleek set
DURABILITY MEETS CLARITY - Permanently stamped thread sizes ensure lifetime readability

This Nut and Bolt Thread Checker set features 44 of the most common SAE and Metric sizes, each with a nut and bolt checker on the same gauge. Thread sizes are permanently stamped for easy identification, making it an essential, durable tool for professionals and DIY enthusiasts alike.

Specifications

ASIN	B06ZYD4SS8
Best Sellers Rank	#168,074 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #666 in Hardware Nuts & Bolts
Item model number	SWTC-M21
Manufacturer	Thread Checker
Package Dimensions	19.89 x 17.5 x 7.11 cm; 1.16 kg

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€ 178.68

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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