Best Seller Part #: 1753

Bolt Size Finder Keychain

$12.87
In Stock & Ready to Ship

Order in the next 4h 32m to get it by June 26, 2026 with Expedited Shipping

  • Easily identify bolt sizes on-the-go
  • Small and compact size makes it easy to carry around anywhere
  • Effortlessly switch between Metric and SAE measurements
  • Say goodbye to the days of test fitting sockets to find the right size
Size: Regular
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Size: Regular
Product Demonstration

Customer Showcase

Find the Right Socket Every Time
FIND THE PERFECT FIT 01

Find the Right Socket Every Time

Skip the trial and error. This bolt size finder instantly identifies fastener sizes so you can grab the correct socket or wrench on the first try. Spend less time searching and more time getting the job done.

One Gauge for Every Toolbox
METRIC & SAE READY 02

One Gauge for Every Toolbox

Measure both Metric (8 mm - 25 mm) and SAE (5/16" - 1") fasteners with a single compact tool. Perfect for mechanics, technicians, and DIYers working across multiple vehicle and equipment standards.

Built for Fast, Accurate Sizing
MECHANIC'S TIME SAVER 03

Built for Fast, Accurate Sizing

Quickly determine bolt and nut sizes without testing multiple sockets. Whether you're in the garage, workshop, or on the jobsite, this sizing gauge helps streamline repairs and improve efficiency.

KEYCHAIN TOOL ESSENTIAL 04

Compact Carry, Instant Access

Small enough for your pocket yet powerful enough for everyday use. Attach it to your keychain, tool bag, or toolbox to keep accurate bolt sizing information within reach wherever your work takes you.

SIZEFINDER-1, SIZEFINDER-XL

Instant Bolt Size Identification

No more testing different sockets to find the right size—our tool makes the process simple and easy.

SIZEFINDER-1, SIZEFINDER-XL

Measures Both Metric and SAE Bolts

Our Bolt Size Finder measures both Metric (8 - 25 mm) and SAE (5/16 - 1") bolts, making it versatile and suitable for any job.With this tool, you won't have to worry about grabbing the wrong socket.

SIZEFINDER-1, SIZEFINDER-XL

Portable and Compact Keychain

Attach it to your keychain and you'll always have it on-hand when you need it.

SIZEFINDER-1, SIZEFINDER-XL

Saves You Time and Effort

Saves you time and effort by allowing you to quickly and easily identify bolt and nut sizes.

Specs & Details

Technical Specifications

Part # 1753: Regular
What's Included
1× Bolt Size Finder Keychain - Regular
Specifications
Measurements
Metric (8–25 mm) and SAE (5/16"–1")
Dimensions
21 cm × 8.5 cm × 5 cm
Country of Origin
Taiwan
Material
Alloy Steel
Style
Portable & Modern
Technical Drawings
Part # 1872: XL
What's Included
1× Bolt Size Finder Keychain - XL
Specifications
Measurements
Metric (25–50 mm) and SAE (1"–2")
Dimensions
33 cm × 13 cm × 6 cm
Country of Origin
Taiwan
Material
Alloy Steel
Style
Portable & Modern
Technical Drawings

Bolt Size Finder FAQs

Q: Will this actually save me time, or is it just another gadget? +

A:</strong> Yes—most users save time on the very first job. Instead of trying multiple sockets or wrenches, you instantly know the exact size and grab the right tool the first time.

Q: I already have a full socket set. Why would I need this? +

A:</strong> Because finding the right socket is often what slows the job down. This gauge eliminates the guesswork, helping you work faster and avoid unnecessary tool swapping.

Q: Does it work with both metric and SAE fasteners? +

A:</strong> Yes. The Bolt Size Finder identifies both metric and SAE sizes, making it useful for automotive, home, industrial, and equipment repairs.

Q: Is it accurate enough for professional mechanics? +

A:</strong> Absolutely. It's designed to provide quick, reliable size identification, making it a practical tool for both professionals and DIYers.

Q: What size range does it cover? +

A:</strong> The Bolt Size Finder covers the most commonly used metric and SAE fasteners, helping you identify the sizes you encounter on everyday jobs.

Q: Can I use it for nuts and bolts? +

A:</strong> Yes. It works on both nuts and bolt heads, giving you a fast way to identify hardware before reaching for a tool.

Q: Should I get the Regular or XL version? +

A:</strong> Choose the Regular version for everyday automotive and household work. If you frequently work on heavy equipment, trailers, or larger machinery, the XL version offers expanded sizing.

Q: Is it durable enough to stay in my toolbox? +

A:</strong> Yes. It's built to handle everyday workshop use while remaining compact and lightweight enough to carry wherever you work

Q: Can a beginner use this, or is it meant for experienced mechanics? +

A:</strong> Anyone can use it. Simply match the fastener to the gauge and read the size—no measuring experience required.

Q: Will this help prevent grabbing the wrong socket? +

A:</strong> Definitely. Instead of testing multiple sockets until one fits, you'll know the correct size before you even open your toolbox.

Q: Is this a good gift for someone who works on cars or equipment? +

A:</strong> Yes. It's one of those tools people don't realize they need until they use it. Practical, affordable, and useful on nearly every project.

General FAQs

What is the warranty for Olsa Tools’ organizers and tools? +

All information about our warranties can be found on our Warranty Page.

When will my order arrive? +

If your order is placed before 2pm MT, it will get shipped the same day, otherwise it will ship on the next business day.

Orders with standard shipping usually arrive within 5-10 business days (longer for rural areas) from when the order was placed.

Orders with expedited shipping typically take 3-5 business days to arrive.

How can I contact Olsa Tools? +

You can contact us at support@olsatools.com or call us toll free at 1-877-252-OLSA (6572).

I’m not happy with the product I purchased, can I return it? +

We offer a 90-Day Risk Free Trial period, if you’re not happy with your product, we pay for return shipping and you get your money back. No questions asked.

*Not applicable to international sales outside of North America.

What happens if customer service doesn’t reply to my inquiry within 30 minutes? +

We’ll refund your entire order if customer service doesn’t reply within 30 minutes during business hours.

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