7 - DESIGN OF SCREW FASTENING ME 418
TYPES OF BOLTS AND SCREWS
CARRIAGE BOLT
MACHINE BOLT
Distinguished by a short portion of the
shank underneath the head being square
An old name for an unfinished through or finned or ribbed.
bolt, comes with a square, hexagonal, or Originally intended for use with wood, this
round head and with coarse and fine bolt is found useful where, for example,
threads. the square part fits into a square hole and
prevents the screw from turning while the
nut is tightened.
CAP SCREW
EYE BOLT
Finished all over.
Come in variety of heads: hexagonal,
fillester, button, flat head and hollow
Provide a place for a hook for lifting
head.
parts.
AUTOMOBILE BOLT
STUD BOLTS
They are threaded on both ends and can
be used where a through bolt is
impossible; for example, in bolting a head
Finished all over. of an engine where the holes in the block
Has the UNF threads. are threaded.
Usually made of heat treated steel, and This practice is especially desirable if the
frequently has a castle nut. hole is in weak or brittle material because
MACHINE DESIGN 1 Page 50
, 7 - DESIGN OF SCREW FASTENING ME 418
the studs can be left in place when the MACHINE SCREWS
head is removed, thus saving wear and
tear on the hole.
However, there are available hardened
steel inserts of various kinds that can be
left in the tapped part, including a thin
Made in small sizes up to 3/8 in, but
spiral piece, that screws into the tapped
they are more accurately made than
hole, covers the weaker threads and stays
stove bolts, are finished all over, and
there.
have fine or coarse threads, various
Stud bolts are also used as through bolts
threads.
with nuts on both ends.
STOVE BOLT
The length L of the machine screw is
the distance from the end of the screw
to the most distant point of contact of
Is a cheap variety of bolt made in small the head with the material being
sizes. clamped.
U-BOLT
TURNBUCKLE
Is a convenient device used to adjust the
length of tie rod, etc.
Used as holding clamps, as on an
automobile spring.
MACHINE DESIGN 1 Page 51
TYPES OF BOLTS AND SCREWS
CARRIAGE BOLT
MACHINE BOLT
Distinguished by a short portion of the
shank underneath the head being square
An old name for an unfinished through or finned or ribbed.
bolt, comes with a square, hexagonal, or Originally intended for use with wood, this
round head and with coarse and fine bolt is found useful where, for example,
threads. the square part fits into a square hole and
prevents the screw from turning while the
nut is tightened.
CAP SCREW
EYE BOLT
Finished all over.
Come in variety of heads: hexagonal,
fillester, button, flat head and hollow
Provide a place for a hook for lifting
head.
parts.
AUTOMOBILE BOLT
STUD BOLTS
They are threaded on both ends and can
be used where a through bolt is
impossible; for example, in bolting a head
Finished all over. of an engine where the holes in the block
Has the UNF threads. are threaded.
Usually made of heat treated steel, and This practice is especially desirable if the
frequently has a castle nut. hole is in weak or brittle material because
MACHINE DESIGN 1 Page 50
, 7 - DESIGN OF SCREW FASTENING ME 418
the studs can be left in place when the MACHINE SCREWS
head is removed, thus saving wear and
tear on the hole.
However, there are available hardened
steel inserts of various kinds that can be
left in the tapped part, including a thin
Made in small sizes up to 3/8 in, but
spiral piece, that screws into the tapped
they are more accurately made than
hole, covers the weaker threads and stays
stove bolts, are finished all over, and
there.
have fine or coarse threads, various
Stud bolts are also used as through bolts
threads.
with nuts on both ends.
STOVE BOLT
The length L of the machine screw is
the distance from the end of the screw
to the most distant point of contact of
Is a cheap variety of bolt made in small the head with the material being
sizes. clamped.
U-BOLT
TURNBUCKLE
Is a convenient device used to adjust the
length of tie rod, etc.
Used as holding clamps, as on an
automobile spring.
MACHINE DESIGN 1 Page 51
