Sealey Vs518 Spark Plug Feeler Gauge - Metric

Product Information

Are you confused about how this instrument works? See the step by step below, where we use as an example the measurement of a spark plug: By using the feeler gauge to examine the gap of spark plug meets the spec for your car or any other vehicle. You have to adjust the gap of the spark plug from its out-of-the-box state. Step 2: Twist Ground Electrode The CTA Tools Spark Plug Gap gauge is made up of a strong and durable all-steel construction built to resist corrosion. It’s a circular gauge with easy-to-read, laser-etched sizes on its body in sizes ranging from 0.025 to 0.060 inches with 0.005 increments. Nine wire rings on the gauge's outer edges help you to accurately measure, increase, and decrease the gap size. Correctly gap your new spark plug. Your original spark plug may come pre-gapped by the manufacturer. These plugs have a designated ignition gap, heat range, and torque that works for your engine. A new spark plug may not have the same gap size, and if you install it with a smaller or larger gap, you may notice a significant decline in your engine’s performance. The spark plug comes into play in charge of supplying the ignition sparks to ignite the fuel in the combustion chambers.

You can buy shorter or longer versions, with short ones tending to measure about 75mm in length. Long feeler gauges are less common but still quite widely used for specialised applications, particularly in engine maintenance and repair. These models can be anywhere between 8 inches and 2 feet in length. Metric and Imperial Feeler Gauges This measurement will give us the number of threads per inch on UNC, UNF, NPT, BSPP, and BSPT threads, and the distance in millimeters between two consecutive ridges on metric threads. Within the blade variety of gauge, some variations include changes to the blade length (long blade and short blade feeler gauges) as well as bent blade (also called offset) gauge sets. The bent blade gauge set can provide for easier use in space-constrained applications and for use in areas with restricted movement and access to the gap being measured. There is also a tapered blade type of gauge set, wherein the width of the blade becomes progressively narrower towards the blade tip, which again, can prove valuable when there are space limitations involved in the work area.

The specific feeler gauge sizes included in a set depend on the number of blades in the set as well as whether the feeler gauge set is an English or metric size set. A representative set of feeler gauge sizes for a decimal inch set is shown below in Table 1, and a decimal millimeter size set is shown in Table 2. These are based on a 25-blade count set – other blade combinations and sizes are available.

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.The best feeler gauge for a given application will depend mainly on the size of the gaps you are measuring, how durable you need the gauge to be, and what sorts of materials or parts you are measuring gaps between.

It is mainly used when measuring the gap between the segment ring and the piston of an endothermic combustion engine or the gap between two gears. 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 CTA Tools Spark Plug Gapper has a heavy-duty construction built for strength and durability. It’s made up of a die-casted metal to harden the steel and increase the accuracy of the unit. It can be used for measuring and readjusting the spark plug gap. The gauge is calibrated in the imperial system, and the size markings are laser etched on the rugged steel construction.

Feeler Gauge Sizes

A feeler gauge is a tool that is used to measure gap width. Here in the following guide, we are going to learn how to read a feeler gauge. Gauges establish a distance between two points. The device consists of multiple sheets or wires sized to exact dimensions marked on the surface of each blade or at the base of each cable. In a similar way to the previous case, we use the gauge to measure the external diameter of a male thread or the internal diameter of a female thread, taking into account the following detail: 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.