Technical Information (1)

What is MDT　SCREW

　It’s the type of screw developed by Morishita Co., Ltd. to reduce the fastening time & cost and to secure the stable tightening

1. 　At the point of screw, MDT SCREW has the threads of non-round cross section that make
　　internal threads by forming process.
2. 　Over half of threaded portion, MDT SCREW has the threads of round cross section. This
　　enables to maintain wide range of driving torque for generating high locking torque
　　and stable axial tension.
3. 　MDT SCREW has "groove" (undercut) on its bearing surface of screw head, which secures
　　the stable fastening with thin metal sheet.

4.    　MDT SCREW is designed to facilitate the screw driving at the time of engagement with
　　holes.
　　 Unlike usual tapping screws, MDT SCREW engages with the holes at 2 positions of screw
　　threads for better screwing-in quality.
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5.  　MDT SCREW has wider pitch of threads and this enables to cut down the time of screw
　　 driving by 50 to 70% as compared with normal selftapping screws.  MDT SCREW also enables
　　 to cut down the time of unfastening for disassembly, which meets the requirements
　　of “Home Appliances Recycling Law (2001)”.

Driving test of MDT SCREW

Screw Dimensions: M4X 8 (Binding Head),
Case Hardened, Zinc-Chromate Plated
Drived in the pierced hole on 1 m/m thick steel plate     
Driving revolution: 800 r.p.m.   Driving Torque: 15 kgf.