We are a leading manufacturer and distributor of hand fastening screws specializing in wing bolts and nuts.

We strive to be the world’s premier supplier of hand fastening screws produced using a variety of materials.

Mitsuboshi, established in 1938, continues to be at the forefront in the manufacture of metal and plastic components striving to excel in quality, competitive pricing and large production volume by adhering to our company motto of “NANI KU SO” or, continuous improvement. With over 70 years as a leader in supplying butterfly bolts, nuts and hand fastening screws to various industries, we continue to develop new technologies which meet, or exceed the demands of our worldwide customer base.

The 21st century has brought many changes in the structure and composition of Japanese industry and Mitsuboshi will always work hard to be our customer’s best partner in current and future product requirements.

We greatly appreciate the loyalty and encouragement of our customers and will continue to improve our level of service by following our motto “NANI KU SO”.

Products Lineup

Pre-production mold
Cassette type mold
On-demand (resin)
Custom-ordered (metal)
Application Example