[M24 (P=2.0)]

[M12 (P=1.5)]

■ Shape: Grooved Nuts (2 types) High
The top of the hex nut has 6 grooves of the cylindrical protrusion, which is used to prevent loosening and falling off.
To tighten and secure the thread, the pin called "split pin" is inserted into the slot of the other bolt to prevent loosening and falling off.

■ Thread Shape: Fine
Finer than the nations most standard pitch (coarse) prescribed by ISO (International Organization for Standardization) standard. Compared to coarse threads, it has a shallow valley and a larger cross-section area which makes it less likely to loose. Please note that there are multiple sizes of pitch depending on the thickness of the screw. Primarily used where precision is required.

■Material: Iron
"Iron" is "steel" and is an alloy of iron containing carbon.
Although it is commonly used in many circulations, it is cheap materials, but due to the downside of it is easy to rust, many surface treatments will reduce corrosion.

■Surface treatment: unichrome
Chromate-treated with only luster.
The hexavalent chrome content is rare, and the corrosion resistance is less than chromate. Hexavalent chrome is hazardous and does not comply with RoHS directive. The alternative is trivalent white.
Color is "Silver Color".

Product Features:
Shape
It is used with 2 pins such as split pins.

Features
By inserting the pin hole of the bolt and the nut groove of the other material, the nut prevents it from rolling around.
Ready-made products come in 1 and 2 types (standard 1 to 4 types), and can be divided into lower and high types.
One type is commonly known as castle nut.