Torque Wrench and Filler Gauge

Torque Wrench

A torque wrench is a tool used to precisely apply a specific torque to a fastener such as a nut or bolt. It is usually in the form of a socket wrench with special internal mechanisms. It was invented by Conrad Bahr in 1918. It was designed to prevent over tightening nuts and bolts. A torque wrench is used where the tightness of nut and bolts is crucial. It allows the operator to measure the torque applied to the fastener so it can be matched to the specifications for a particular application. Torque wrenches are of various types such as digital wrench, angular wrench etc.

Torque wrenches are often considered and used as “tools” rather than true measuring “instruments”. They provide a “visible” measure of torque (dial indicating, flat beam TW). They are used to control torque in assembly and fastening operations.

Filler Gauge

A filler gauge is a tool used to measure gap widths. Filler gauges are mostly used in engineering to measure the clearance between two parts or surfaces.They consist of a number of small lengths of steel of different thicknesses with measurements marked on each piece. They are flexible enough that, even if they
are all on the same hinge, several can be stacked together to gauge intermediate
values. It is common to have two sets for imperial units (typically measured in
thousandths of an inch) and metric (typically measured in hundredths of a
millimetre) measurements.

A similar device with wires of specific diameter instead of flat blades is used to set the gap in spark plugs to the correct size; this is done by increasing or decreasing the gap until the gauge of the correct size just fits inside the gap. The lengths of steel are sometimes called leaves or blades, although they have no sharp edge.

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