The impact screwdriver pattented by Vessel.

 

Every time the Phillips screwdriver you have been using for the last 30 years cams-out and ruins a perfectly good screw could have been avoided by using the proper tool, a JIS screwdriver.

The screw on our bikes are made with the Japan Industrial Standard (JIS) which in this case tries to avoid cam-out when a lot of torque is applied, the opposite of the Phillips standard.

 

For a very informative article on the subject of screw standards go to Instructable. For those who prefer to watch videos MC garage and a few others cover the subject.

 

There are many Japanese tool brands and even a few specialized in screwdrivers (VESSEL, ANEX, SUNFLAG,...). Curiously outside of Japan it was difficult to find JIS screwdrivers adapted for Japanese motorcycles.

 

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JIS Screwdriver Vessel Megadora Impacta

Vessel Megadora Impacta
  • The Vessel Megadora Impacta main advantage is its internal impact sytem. When you hit the screwdriver with a hammer it will try to rotate 12 degree counter-clockwise to release the screw.

    Here is the product video by Vessel

    The Vessel Megadora Impacta comes in two sizes:

    • + #2 for screws M4 and M5, in two length 100mm and 150mm
    • + #3 for M6 and M8. This is the size we use the most.

    Both sizes are needed for motorcycle repair. Do not try the #2 with M6 screws!

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Our products are made in Japan and shipped from Japan.

Japanese vintage motorcycles, JIS screw, small head nut, small head bolt, pan head screw, honda, Kawasaki, Yamaha, Suzuki, Kawasaki 900 Z1, honda 750 CB K, Yamaha 350 rd, Suzuki 750 gt, zinc, stainless, acorn nut, black zinc, Japanese industrial standard, JIS screwdriver, engine bolt, flange bolt, 7 mark bolt, JIS screwdriver, vessel megadora