Screw Comparison Guide - Screw Heads.
Use this Screw Comparison Chart to help choose the right screw that best fits
your application. Compare Screw Heads,
Screw Threads and size for either
Interior or
Exterior applications.
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Here
are top and side views of many of the screw-head styles you’ll encounter.
Top row, left to right: flat head, flat head with a separate finishing
washer, washer head, and truss head. Bottom row, left to right: round head,
oval head, pan head, fillister, and trim head.
You can buy screws
with a variety of head styles to meet specific project needs and can often
select the fastener with your favorite drive system. Here’s a quick rundown
on the uses for the most popular types. |
Flat-Head Screws:
Probably the most common style and are used in a wide variety of
applications, from general construction to fastening tiny hinges. The head
is typically flat with the surface of the wood, or it can be driven into the
bottom of a counterbore and concealed with a plug. It’s also the right
choice to use with finishing washers.
Trim-Head Screws:
Look like finishing nails and can be used wherever you need the holding
power of a screw but also require an unobtrusive look.
Round-Head
Screw:
Gives you the broadened holding strength of a washer under a screw head but
without the inconvenience of purchasing and handling a separate piece of
hardware. By spreading the pressure, the washer-head screw avoids
concentrated stresses that could crack plastics or damage thin wood
products. |
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Oval-Head Screws:
Mount with their smooth top just above the wood’s surface. This gives a
decorative look and also prevents the snags produced by flat-head screws
that aren’t fully countersunk. The oval head finds extensive use holding
trim to boats.
Pan-Head
Screws:
Have a flat surface under the head that improves holding power when you
mount hardware such as drawer slides. Using a screw diameter smaller than
the mounting hole in the hardware gives you some adjustability.
Truss-head
screws:
Feature an even larger washer surface for improved holding power. Truss
heads are excellent for attaching false drawer fronts – large head hides an
oversized hole that permits adjustment. Truss heads also provide excellent
holding power when driven through the thin plywood backs of wall-mounted
cabinets. |
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Excerpted from
Taunton's Complete Illustrated Guide to Hardware Copyright @2003
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