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Nut & Bolt Thread Checker (SAE/Inch)

Q: Unclear from the description, but are these for "fine" or "coarse" or a mix?

Mine started with 6-40 (fine thread) and went up from there. I bought both the SAE and metric. They are great for determining threaded holes in machine restorations and simple thread and size identification.

Q: Are these thread checkers marked "Made in the USA"?

I guess the answer is "no". There is a "key chain" at one end that says "The original Thread Checker - United States Patent #7877882, but other than that there are no markings except for the sizes on each piece.

Q: I need one of these that goes down to 2-56 sae and m3 metric. anybody seen such a beast?

Bolt Depot.com has SAE 1-64 to #5-40, 9 pcs, or Metric M12-0.25 to M3.5-0.35 12 pcs. Each are $17.00.

Q: are these made of aluminum?

Hey, these definitely aren't made of aluminum. Steel for sure, possibly stainless (mine aren't rusty after all these years, anyway). Quality product and quite useful for checking threads in odd places that a thread-card can't reach. Saved me a lot of trouble more than once.

Product ID: 420874344

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Frequently Bought Together

Description

Nut & Bolt Thread Checker (SAE/Inch)

Specifications

Material	Alloy Steel
Drive System	Double Square
Head Style	Binding
Item Dimensions LxWxH	6 x 4 x 1 inches
Exterior Finish	Zinc,Steel
Thread Size	1/4"-20
Metal Type	Alloy Steel, Zinc
Brand	Thread Checker
Color	Metal
Item Weight	8 Ounces
Thread Coverage	Fully Threaded
Thread Style	Right Hand
Size	Multi
Manufacturer	Thread Checker
Part Number	SWTC-S21
Item Weight	8 ounces
Product Dimensions	6 x 4 x 1 inches
Item model number	SWTC-S21
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Measurement System	Imperial
Batteries Included?	No
Batteries Required?	No
Warranty Description	No

Have a Question? See What Others Asked

Unclear from the description, but are these for "fine" or "coarse" or a mix?

Are these thread checkers marked "Made in the USA"?

I need one of these that goes down to 2-56 sae and m3 metric. anybody seen such a beast?

are these made of aluminum?

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

View all Trustpilot reviews

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