Stop Stripping Screws on Your Japanese Car or Motorcycle: JIS vs. Phillips Explained
If you work on a Japanese motorcycle, kei car or older JDM import, you have probably had a cross-head screwdriver that looks like the right size climb out of a screw and chew up the head. Many mechanics blame this on JIS (Japanese Industrial Standard) cross-head screws. This guide explains what JIS screws are, where the experts disagree, and what actually helps on the bench.
- JIS cross-head screws look almost identical to Phillips screws.
- Some industry sources say the recess shape differs enough that a Phillips driver will not seat fully. Others say a well-made driver of the correct size fits both.
- Either way, the practical fix is the same: use a sharp, correctly sized, well-made driver, press firmly, and stop as soon as the driver starts to climb out.
- If the head is already rounded, use a stripped-screw removal bit instead of forcing a driver.
What is a JIS screw?
JIS is Japan's national industrial standard, and it includes a standard for cross-head screws. These screws are common on older Japanese motorcycles, for example on engine cases, carburetor float bowls and bodywork. Rider Magazine quotes Motion Pro saying the JIS recess shape is different enough from Phillips that the tools are not interchangeable, and that a Phillips tip may not seat fully and can cam out.
Where the experts disagree
Not everyone agrees the difference is that large. Tool maker TEKTON argues that Phillips (ASME/ISO) and JIS cross-tip drivers should both work in a normal cross-tip screw, and that a well-made driver of the correct size will fit a JIS screw. TEKTON says much of the problem comes from worn or poorly made drivers, and from using the wrong size.
The two views agree on the practical point: a cheap or worn driver, or the wrong size, is the fastest way to strip these screws.
How to tell if you are looking at a JIS screw
Some JIS screws have a small dot or mark next to the cross. Rider Magazine describes the dot as a JIS marker. TEKTON says the dot actually indicates a JIS thread pitch, and that many JIS fasteners carry no dot at all. Because of this, do not rely on the dot alone. A more useful test is behavior: if a correctly sized driver keeps climbing out of a screw on Japanese-made equipment, stop and change tools before the head rounds off.
What to reach for
Before the screw is damaged: precise, well-made drivers
For the small screws on covers, carburetors and electronics, a precision driver set from a Japanese maker gives you sharp, correctly sized tips.
For screws that are stuck rather than stripped, a hand-impact driver turns a hammer blow into turning force while pushing the bit into the screw. See our VESSEL vs ANEX guide for the models we carry.
After the screw is stripped: removal bits by screw size
When a driver just spins, a stripped-screw removal bit is made to grip what is left of a rounded recess. Match the bit to the screw size.
For badly damaged screws and bolts, see our Neji-Saurus guide.
Near electrical parts: insulated drivers
FAQ
Will a JIS driver work in a Phillips screw?
Many mechanics report that it does, and TEKTON says correctly sized cross-tip drivers made to either standard should work in normal cross-tip screws. The size matters more than the label.
Does the dot always mean JIS?
No. Sources disagree on what the dot means, and many JIS screws have no dot. Judge by how the driver fits.
What is the most common cause of stripped cross-head screws?
The wrong size, a worn tip and too little downward pressure are the causes both sides of the JIS debate agree on.
Related guides
- VESSEL vs ANEX: which screwdriver brand?
- Neji-Saurus: choosing a stripped-screw tool
- Japanese ratchet tools for tight spaces
Shipped directly from Japan
We ship genuine Japanese tools from Japan with tracking (Japan Post, FedEx or DHL). Not sure which driver or bit fits your screw? Message us with the screw size and where it is, and we will help you choose.
Browse ANEX tools Browse Japanese hand toolsSources
- Rider Magazine: Tech Q&A, JIS vs. Phillips head screws (recess difference, dot marking, quote from Motion Pro)
- TEKTON: JIS vs Phillips, tip geometry, myths and fastener compatibility (opposing view, dot and thread pitch)
Product details are taken from our product listings. Last reviewed: October 2026.
