Sigma
IWATA BOLT Informational Magazine.
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Oct 1969 Issue
[Sigma 2]
- 1.System and Screws ... Yukichi Iwata, President
- 〈Control System of Iwata Bolt 〉
- 2.SPICS that utilizes the cock warehouse method
- 〈From Quality Control Section 〉
- 3.Quality assurance system in our manufacturing department (2)
- 〈Explanation of screw terms 2〉
- 4.Tapping Screw
- 〈Overseas spot news〉
- 5.The wide spreading roles of fastening
- 6.One Jumbo jet uses 700,000 screws, worth $ 1 million
- 7.Deburring of screw parts by chemical milling
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Sep 1969 Issue
[Sigma 1]
- 1.Issuing ... Yukichi Iwata, President
- 〈Control System of Iwata Bolt〉
- 2.Current status of our IT department
- 〈From Quality Control Section〉
- 3.Quality assurance system in our manufacturing department
- 〈Explanation of screw terms 1〉
- 4.Regarding the distinction between bolts and screws
- 〈Overseas spot news〉
- 5.US screw production is about 600 billion yen, about 4 times that of Japan
- 6.The tightening standards for automobile fasteners
- 7.Nut inspection for 7200 pieces per hour
- 8.MP35N gets attention as a fastener material for space and ocean development
- 9.Increased interest in aluminum coating due to corrosion resistance

