What is JIS screwdriver?

What is JIS screwdriver? Japanese Industry Standard: Often improperly referred to as Japanese Phillips. Commonly found in Japanese equipment, JIS looks much like a Phillips screw (and even more similar to Frearson), but is designed not to cam out and will, therefore, be damaged by a Phillips screwdriver if it is too tight.

What’s the difference between Phillips and JIS? JIS, or Japanese Industry Standard screws are just different enough in shape that Phillips drivers will not fit well and slip/strip them. The difference is in the leading angle of the point of the driver. Phillips bits have a larger angle and therefore don’t bottom out in the JIS screws, causing slippage.

Are JIS screws still used? Nowadays, hex-head fasteners have replaced JIS screws in most applications, but you’ll still find them on vintage bikes and the occasional modern machine. If you’re tired of butchering screws, you can always pick up the correct tool from Motion Pro.

How can you tell if a screw is JIS? 

What is JIS screwdriver? – Additional Questions

Do Japanese cars use JIS screws?

It turns out that Japanese equipment uses screws that are built to the Japanese Industrial Standard (JIS) B 1012 specification. These screws look like a Phillips screw, but are designed not to cam out and will therefore be damaged by a Phillips screwdriver under high torque.

How are JIS screwdrivers labeled?

Some JIS screws can be identified by a single dot or dimple on the head of the screw. However, if the screw doesn’t have a marking, then it’s very difficult to identify one from the other.

Is pozidriv the same as JIS?

Japanese Industrial Standard has slightly different angles in each of the two axii of all four blades. Posidrive are easily identifiable by the four secondary hash marks between the flutes on the screw head. The JIS MAY, or MAY NOT have a single dot between two of the flutes.

What is a frearson screw?

The Frearson screw drive, also known as the Reed and Prince screw drive, and specified as ANSI Type II Cross Recess, is similar to a Phillips but the Frearson has a sharp tip and larger angle in the V shape. One advantage over the Phillips drive is that one driver or bit fits all screw sizes.

What is a Robertson head screw?

4.81–4.85. A Robertson screw, also known as a square screw or Scrulox, is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper.

Which is better Torx or square drive?

Square (Roberts) drive provides a more positive bit engagement over Philips. This makes it easier to drive and harder for impact driver bits to strip the heads of stainless steel decking screws. For coated screws, we typically prefer Torx or star drive (T-25) as it gives you lots of points of contact.

Why are Torx screws better?

The Torx design allows for a higher torque to be exerted than a similarly sized conventional hex socket head without damaging the head and/or the tool.

Why are there no Robertson screws in America?

Robertson screws are just about impossible to strip, unlike Phillips-head ones, which become unusable about thirty seconds after you’ve brandished the screwdriver at them. They’d be popular in the States except that Henry Ford wanted exclusive rights to them, and Robertson (the inventor, a Canadian) refused to sell.

Can you use hex instead of Torx?

The short answer is…you’ll break your torx wrenches on a hex screw head. The fragile tips of a torx or security star bit are prone to bending & snapping without fitting snugly inside of the screw head.

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