What size is my Woodruff key?

What size is my Woodruff key?

How are woodruff keys measured? Woodruff keys, identifiable by their half-moon shape, are measured two ways depending on if it is an imperial or metric key. Imperial woodruff keys are measured by their width and diameter, whereas metric woodruff keys are measured by their width and height.

What is a Woodruff key used for?

A woodruff key is a half‑moon shaped machine key that prevents gears, hubs, or other components from moving independently of a rotating shaft or spindle. They also act as a fail‑safe that protects expensive parts by shearing under excessive loads.

What are crank bolts?

Crank bolts, as the name suggests, are used to secure the crank to the axle (spindle) of the bottom bracket(BB). While they are another of those parts that may go largely unnoticed by most riders – sometimes they are even covered by a dust cap – they may become loose and worn over time and require replacement.

What is a crankshaft key?

Crankshaft keys (also called woodruff keys) are semicircular shaped, removable keys that fit into matching keyways cut into the crankshaft leaving protruding tabs. These tabs mate with matching slots on the harmonic balancer flush upon the shaft.

How do I identify a Woodruff key?

The Woodruff Key numbers indicate normal key dimensions. The last two digits give the nominal diameter B in eighths of an inch and the digits preceding the last two give the nominal width W in thirty-seconds of an inch.

What does a Woodruff key look like?

Woodruff keys are semicircular shaped, such that, when installed, leave a protruding tab. The keyway in the shaft is a semi-circular pocket, the mating part, a longitudinal slot. They are used to improve the concentricity of the shaft and the mating part, which is critical for high speed operation.

Do all bike pedals have the same thread?

Are All Bike Pedal Threads the Same Size? No bike pedal threads are not the same size. These days there are two major sizes. For example, 9/16 20 TPI (threads per inch) is the most common size of thread used on bicycle pedals and will be the size needed for all modern bikes today.

What are Half Moon keys?

Woodruff keys work well near shaft shoulders, where a standard open keyway would create too much stress. They are also often used on tapered shafts. Use them to connect gears and other components to shafts. Also known as half moon keys.

What are the different bicycle pedal sizes?

In fact, there are two main bicycle pedal sizes: 9/16” and ½”. There are also specific pedal sizes used in kids’ bikes. The 9/16” bicycle pedals are used very often and are the standard in pedals, while the 1/2” pedal and other variations of the bike pedal are used less often.

What are the standard keyway and key size dimensions?

Keyway and Key Size Dimensions * Common dimension specification English Standard Keyway and Key Sizes Shaft Diameter (in) Keyway (in)* Key (in) From To Width (W) Depth (T 1) Width (W) Depth (T) 5/16 7/16 3/32 3/64 3/32 3/32 1/2 9/16 1/8 1/16 1/8 1/8 5/8 7/8 3/16 3/32 3/16 3/16 15/16 1-1/4 1/4 1/8 1/4 1/4 1-5/16 1-3/8 5/16 5/32 5/16 5/16

What is a screw thread on a bike pedal?

The screw thread is the part of the pedal that gets connected to the bike. The 9/16” bicycle pedal is used for most modern adult bikes. So, if you are looking for a set of pedals for a standard adult bike, your bike likely fits a 9/16” pedal.

How do you dimension a hub keyway?

In the English system, it is standard practice to dimension keyways. The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. Referencing Figure 1, the keyway dimension is W x T1.