SuperStore Products
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Screws
Machine · Tapping · SEMS
Self-Drilling · Wood · Weld
Bolts
Hex Cap · Lag · Carriage
Step · Elevator · Plow · Tap
Nuts
Acorn · Nylon Insert · Cage
Tee · Jam · Finished Hex
Washers
Flat · Fender · Nylon · Dock
Tooth · Split · Finishing
Electronic Hardware
Spacers & Standoffs
PEM® Style Clinch Hardware
Rivets
Blind / Pop · Drive
Sockets
Socket Cap Screws · Pipe Plugs
Set Screws · Blue Devil
Anchors
Plastic · Wedge · Drop-In
Sleeve · Wallboard · Toggle
Fastener Assortments
Sockets · Screws · Nuts
Cable Ties · Grease Fittings
Mil-Spec
Milspec Screws, Nuts & Washers
Retaining Rings
E-Style & Int. / Ext.
Pins
Cotter · Roll / Spring · Dowel
Tools
Wall Anchor Setting
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Machine Screws at Fastener Superstore
Machine
screws are sometimes confused with simple screws and bolts.
Unlike simple screws, most machine screws do not have a tapered end. They are
machined to fit into a threaded female receiver (a nut, a pre-drilled hole,
etc) that
matches the thread on the screw. Simple screws do not have this feature - they
simply get driven by force into soft materials. Unlike bolts, machine screws
are usually small, threaded all the way to the head, and meant to be driven
in by the head, securing themselves with the threads alone. Bolts often have
a shoulder, or a part of the shaft with no threads. They are always attached
by a nut or another securing device at the threaded end.
Machine Screw Properties
Materials and Applications
The durability and precision manufacturing of machine screws makes them versatile.
They are strong enough to be used in many applications: home, automotive,
marine, military, industrial, high-tension and high-corrosion. They are also
small enough to fit into tight spots.
The material your machine screws are made of is important to the application.
Here are a few of the most common materials, their properties and applications.
-
Zinc Plated Steel Machine Screws -- Steel screws
some coated in several different types of zinc. These screws offer
some corrosion and rust resistance.
-
Stainless Steel Machine Screws -- Stainless Steel offers
high rust and corrosion resistance with comparable strength to steel
screws. The most common stainless steel for machine screws is 18-8 Stainless steel (alloy with 18% chromium and 8%
nickel).
-
Nylon Machine Screws -- 6/6 Nylon is useful in applications
where metal to metal electrolytic corrosion or electrical corrosion
may take place, such as securing car batteries and machine control
panels.
-
Black Oxide Coated Stainless Scews -- Black oxide coating can
give parts corrosion resistance equivalent to 400 hours of salt spray
exposure. These coatings are widely used in automotive, appliance,
machine tool and metal forming industries. Other applications are
designed to provide extended shelf life for stored parts prior to
their use or to prepare them for future surface treatment.
Sizes and Measurements
Machine Screws come in many different sizes. Some applications use different
measurement systems.
- US Machine Screws -- US screw measurements go by fractions
of inches. They are most often found on construction materials, around
the home, on old cars and anything made in the US before the 1970s. Unfortunately
for the metrication effort, many other applications which should be functioning
in metric are still using US screw sizes.
- Metric Machine Screws -- Metric screws are measured in millimeters.
Metric is swiftly replacing US as the standard for industrial, military
and automotive applications. These highly specialized applications require
the precision of metric measurements, as well as compliance with international
standards governing manufacture and quality.
Our Machine Screws
Fastener Superstore offers a wide variety of machine screws, including
all the materials listed here in both metric and US measurements. Visit
our
Machine
Screws product page for a complete listing to find the specific screw
for your needs.
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