Angled feeler gauges are ones whose tips are bent over at a slight angle to the rest of the blade. This can be handy for accessing harder to reach gaps, where it may not be possible to slide a standard gap gauge in straight enough to get a good reading on the width of the opening. They are also known as offset feeler gauges. Feeler Gauge Sets

All feeler gauges are somewhat thin. This is because the point of them is to fit into and measure gaps that are far too narrow for most other common measuring tools, such as tape measures.Both instruments are very useful for toolmakers, mechanics, automatic lathes operators, modelers, and professionals in related fields. How to Read a Feeler Gauge- 5 Steps Process img source: axminstertools.com Blade material – As mentioned carbon steel blades are commonly used, but other materials such as brass, stainless steel, and even plastic blades are available. Brass has the advantage that it will not precipitate a spark while in use, valuable for applications where explosive atmospheres might exist. Brass is also is non-corrosive and non-magnetic, desirable properties in uses such as electronics. Stainless steel can resist high temperatures, and plastic is non-corrosive, non-sparking, non-marring, and non-magnetic. Some of the gauge sets will offer blades of more than one material in the same set, such as steel and brass together. But it is not the only function they perform: they also take care of alleviating the heat which is generated in the combustion chamber to the cooling system. Now that you know that there are different models of gap gauge, you need to evaluate which is the most suitable for the equipment you want to measure. Below, we have listed some of the most common types, materials and models of feeler gauges. Most are available either as full sets or as individual blades. Wire Type Feeler Gauges

A wire-type feeler gauge is a little different to the standard shim arrangement. Instead of featuring a series of graded metal leaves or blades, the wire feeler gauge instead has a series of rigid metal wires. The sizes range from 0.02 to 0.1 inches with 0.01 increments, and they are easy to read. The gapper is also designed with a key ring hole or a spark gap opener with a 7/16 inch diameter. The hole helps you accurately resize spark plugs with an electrode tool included. The tool can measure the clearance of any spark plug model. If the thread is cylindrical, we measure any thread from crest to crest. Whether the thread is tapered, we measure the fourth or fifth thread from crest to crest. 04. Measure the Pitch of the Thread This CTA gap adjustment tool only weighs 1.44 ounces and will offer over 30 accurate gaping measurements before you need to readjust it. It also includes one electrode-adjusting tool. The unit is designed to adjust the plug without pressuring the center electrode. The tool can be used at home and in a professional garage. This tool makes gapping plugs a lot easier compared to tiny plug gapping tools, and you can get a good grip on what you're doing. It's a simple but functional device, and it's comfortable to use with no rough edges. The gauge is also very accurate, and the adjustment hole is useful for widening the gap. It is also simple to make small adjustments because it provides a lot of leverage, so you don't need to press very hard.Let’s also remember that cylindrical threads are UNC / UNF, BSPP, and metric, while conical threads are NPT and BSPT, although occasionally there may be tapered metric threads. 03. Measure the Diameter of the Thread

The OEM Tools Blade Master has 26 calibrated blades that can measure sizes ranging from 0.0015 to 0.025 inches. You can get the exact value of the gap in either SAE or metric system (inches and millimeters). The measurements are laser etched in the middle of each blade. The blades are made of hardened tempered steel, which is long-lasting and resistant to rust and corrosion.

Mind the Gap

Some of the most common sizes you will likely find yourself using include 1mm, 1.5mm and 2mm feeler gauges. However, the ones you tend to use the most will of course depend largely on what type of work you are doing.