hex bolt: head of the bolt is in hexagonal shape and the hex bolt and washer are joined together.

2. flange bolt: the head shape of the bold is formed in flange type.

3. hex bolt: this is a high functional and high degree of bolt that is used in automobile and mechanical structures with the outstanding vibration, impact, anti-abrasion and anti-heating and others.

4. flange bolt: this is the bolt that has larger diameter of the surface than the cross-sectional distance, and it is valid in joining the bolts with high attachment. and, when using this bolt, washer is not needed. and it is bery effective on the relaxation of the screws.

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