Stanley MBF5 User Manual page 26

STANLEY breakers are available with several different types of tool bits. The most common are the moil, chisel and
blunt. Each of these working steels has its own purpose as described below.
To obtain the maximum production from the breaker, it is important to select the proper working steel. Consult your
STANLEY representative for assistance in selecting the proper working steel for your application.
26 ► MBF5 User Manual
PROPER CARE OF TOOL BITS
MOIL
This is by far the most popular working steel. It is a general purpose point used to break
anything from concrete to hard rock. Its pencil-type point is used to fracture the material.
The tool is best where penetration speed is important.
CHISEL
This style of point is generally used for trench work, where a controlled break is required,
and for rock breaking on materials with a definite line of cleavage. A chisel bit also works
well in softer concretes where a moil might penetrate quickly, but not cause a fracture line.
BLUNT
This flat type of bit is used to break softer material such as coal or shale. A moil or chisel
will tend to punch holes in this type of material, where a flat blunt will shatter the material. It
is also useful when breaking irregularly shaped material where its broad tip makes it easier
to position.