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The name comes from the appearance of a butterfly with its wings spread out, and these are bolts and nuts with knobs that can be easily tightened by hand, and are also called wing screws or wing bolts/nuts. There are bolts with male threads and nuts with female threads. It is used in food machinery, medical equipment, machine tools, agricultural machinery, lighting equipment, musical instruments, etc., where there is a lot of repeated attachment and detachment and tightening strength is not required. They are classified into JIS types 1 to 4 based on the shape and size of the wing, manufacturing method, etc. The first type has an arc-shaped tip, and the second type has a rectangular shape with a small R type and a large H type, and the manufacturing method (heading, forging, casting, etc.) is arbitrary. Type 3 is defined as press processing, which is lightweight and inexpensive, and type 4 is defined as casting, which has a rectangular tip with a concave center part.
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See all 6 models in listPart Number
Butterfly bolt/nutProduct
Hand tighten screwHandling Company
Bossard Co., Ltd.Categories
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