What is a thread depth gauge?

Typical tire tread depth gauges measure up to 32/32nds (or 25-26mm) since almost all passenger car and light truck tires begin with less than one inch of tread depth. Some tread depth gauges measure in 32nds of an inch (left), while others measure in both 32nds of an inch and millimeters (right).

How does a depth gauge work?

In a membrane depth gauge, the water presses onto a metal canister with a flexible end, which is deflected proportionally to external pressure. Deflection of the membrane is amplified by a lever and gear mechanism and transferred to an indicator pointer like in an aneroid barometer.

What do you need to know about bottoming taps?

Bottoming Taps are made with just enough chamfer for starting in the hole, only 1 to 2 half threads. As the name implies, it is designed to thread blind holes to the bottom. Tap Sizes have been standardized to conform with those of standard screws, bolts, and studs.

How to calculate tap depth for spiral point plugs?

Tap drill depths for spiral point plug tapping blind holes. For over 40 years I have waited for a definitive formula that would work well for calculating tap drill depths for blind holes. For 30 years I have used the simple formula of Thread Depth + Thread Pitch * 9 for threads of two diameters of depths.

What kind of tap do you use to thread a hole?

Also known as cold-forming and fluteless taps, these press threads into material without cutting it, so no chips are created. With a taper chamfer and bottoming chamfer at opposite ends, these taps start threads easily and are good for threading close to the bottom of closed-end holes.

What’s the difference between tap depth and hole depth?

The fact is the volume, stiffness and tenacity of the cut thread wire that is being forced into the hole; determines the amount of volume below the full thread depth that will be required in order not to break a spiral point plug tap.