K3720-1 - Lincoln Electric Stainless Steel Fillet Weld Gauge Set (7-Piece)

Durable and Easy-to-Read Fillet Gauges

For the professional welder, carrying a reliable set of gauges is just as important as having a good chipping hammer or a pair of MIG pliers. The Lincoln Electric K3720-1 Stainless Steel Weld Fillet Gauge Set is built to live in your pocket or tool bucket, ready for action whenever you need to verify a weld size. We all know that shop environments are tough on tools—humidity, sparks, and rough handling are part of the daily grind. That is why Lincoln Electric chose stainless steel for this set. It resists the rust and corrosion that often ruins cheaper gauges, ensuring that your tool stays shiny, clean, and usable job after job.

One of the biggest frustrations with older or cheaper gauges is trying to read the stamped numbers after they have been worn down or covered in shop grime. This set solves that problem with deep laser-etched markings that are back-filled with black ink. The high contrast makes it incredibly easy to identify the correct leaf size, even when you have your hood up in a low-light corner of a tank or under a structural beam. The set includes seven blades measuring from 1/8 inch up to 1 inch, covering the most common fillet sizes you will encounter on blueprints and welding procedure specifications (WPS).

Safety and comfort are also built into the design. Cheaply made gauges often have sharp burrs left over from the stamping process, which can slice your fingers when you are digging for them in your pocket. Lincoln Electric has precision-cut these gauges with smooth edges, preventing cuts and making them comfortable to handle all day. This feature also protects the metal you are measuring; you won't accidentally scratch a polished stainless surface or a machined part while checking your weld size.

This tool is designed to measure both convex (bumped out) and concave (sucked in) fillet welds. This dual capability allows you to quickly verify leg length and throat thickness requirements on the fly. Instead of guessing or eyeing it up, you can slap the gauge on and know immediately if you need another pass or if you are good to go. Proudly Made in the USA, this gauge set delivers the quality and reliability you expect from the Lincoln Electric brand.