Screws
Hex
Head Cap Screws
There are several differences
between hex head cap screws and hex bolts. The main
one is that cap screws have a tighter body tolerance
than bolts. For example a 1" diameter cap screw
has a maximum body diameter of 1.000, while a 1"
diameter bolt could range as high as 1.022 and may be
as large as 1.060 directly under the head.
Click
here for more information about hex head cap screws.
Slotted
Flat Head Cap Screws
Slotted flat head cap screws are used where the top
of the screw head is to be flush with one of the assembly
surfaces. The underside of the screw head and the accompanying
hole are countersunk at an 82-degree (includes angle).
Click
here for more information about slotted flat head cap
screws.
Machine
Screws
Machine screws are standardized in a variety of head
styles. Pan head and round head are the most basic where
the head of the screw is on top of the work surface.
Flat heads and oval heads are used when the head is
countersunk into the work surface. Fillister heads are
used in counter bored holes. Machine screws are also
available with hex heads.
Click
here for more information about machine screws.
Socket
Screws
Socket screws come in a variety of configurations. Socket
head cap screws feature a cylindrical head. Flat socket
heads are flat on top with a countersunk underside.
Click
here for more information about socket screws.
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