Ulsa Tools Bolt Head Size Finder Review: A Simple Way to Identify Nut and Bolt Sizes

Introduction

If you have ever picked up a mystery bolt and started marching it down a socket rail one size at a time, the Ulsa Tools Bolt Head Size Finder (part number 1753) will feel like a small revelation. It sells for roughly 12 to 13 dollars and does one job: it tells you the size of a hex bolt or nut head quickly, in either SAE or metric.

The design is a simple steel scissor mechanism with a slider. You drop the hex shape into the gauge, cinch it up, and read the size off the scale. It will not replace your calipers for precision work, but for identifying hardware in the shop or garage, it is a genuinely handy little tool.

Who This Product Is For

This gauge suits anyone who regularly deals with unmarked hardware: home mechanics, anyone servicing equipment, or people sorting bins of loose nuts and bolts. If you already know most sizes on sight, it will be less useful, but for the rest of us it removes the guesswork.

Main Strengths

The core strength is simplicity of use. Grab a nut or a bolt head, drop it in the jaws, cinch it up, and read the size. There is no fumbling with sockets, no trial-and-error fitting, and no reading ambiguity when the gauge settles into the correct slot.

The dual scale is the other practical win. One side reads SAE (fractional inch) and the other metric, so mixed hardware is not a problem. As an example, an 11 mm head on the metric side corresponds to about a 7/16 inch on the SAE side, and the gauge makes that cross-reference easy to see at a glance.

The coverage is reasonable for common hardware: roughly 25 mm down to 8 mm on the metric side, and 1 inch down to about 5/16 inch on the SAE side. That range handles the sizes you actually encounter in day-to-day work, such as the common 14 mm oil drain plugs.

Things to Consider Before Buying

The gauge works “within reason” as the phrasing goes, meaning very large or unusual fasteners fall outside its range. It is also a visual match tool rather than a measuring instrument, so if a bolt is worn, rounded, or slightly off-spec, you may need to judge between two adjacent sizes. On an unusual bolt that reads a little off on both scales, the gauge narrows it down but you still make the final call.

It is also worth noting that this is a niche convenience tool. If you rarely work with unknown hardware, a socket set you already own may cover the need, just more slowly.

Buying Advice

At a price of roughly 12 to 13 dollars, the Bolt Head Size Finder is a low-risk purchase. If your current method is grabbing an adjustable wrench, squeezing it onto the bolt, and squinting to read the size, this is a clear upgrade in both speed and accuracy.

It also makes a nice small gift or stocking-stuffer for anyone who spends time in a garage. Ulsa Tools has been expanding into neat little niche tools like this one, and this is a good starting point if you have not seen one before.

Conclusion

The Ulsa Tools Bolt Head Size Finder is a cute, inexpensive, and genuinely practical shop accessory. It turns a tedious socket-trial routine into a one-second read, works across both metric and SAE hardware, and covers the most common fastener sizes. For the price, it is an easy recommendation for anyone who regularly faces mystery bolts.