Nylon  Fasteners

Nylon is used to make plastic fasteners such as nylon screws, hex nuts, hex head cap screws, flat washers and cable ties. This material is also used for printed circuit board hardware, automotive parts and fabrics. In this blog we will discuss nylon 6/6 fasteners.

Development of Nylon 

Nylon was first developed in the late 1930’s by Wallace Carothers at DuPont. The material was introduced as a fabric at the 1939 New York World’s Fair. It was an immediate hit as a replacement for silk in stockings therefore the term “nylons”. Since 1939, it has been incorporated into such diverse products as toothbrushes and truck tires.

Nylon 6/6 is a polyamide.   It is made of two monomers.  Each monomer contains 6 carbon atoms of hexamethylenediamine and adipic acid. Therefore the material is referred to as Nylon 6/6.

Pros of Nylon 6/6

Light weight

Low cost

Can be injection molded

UV Resistant with an additive

High dielectric strength (Electrically insulating)

Heat Tolerant (Continuous Service Temp of 210°F/99°C)

Fire retardant

Excellent bearing and wear resistance

Reduced noise

Reduced wear on mating parts

Water repellent

Cons of Nylon 6/6

Hygroscopic (Absorbs water)

Not UV resistant in natural

Molded nylon has fairly wide tolerances

Generally moderate chemical resistance

Properties and Uses for Nylon 6/6

Nylon 6/6 is a general purpose nylon frequently used when high mechanical strength, rigidity, and good stability under heat and/or moderate chemical resistance are required.  It has good mechanical properties and is very wear resistant.  It can be both molded and extruded.

Nylon 6/6 is made into machined or molded parts for engineering applications.  These parts are used predominantly in the automotive industry as well the electrical and electronics industries.

In the automotive industry it is fabricated into parts such as radiator end tanks, rocker covers, air intake manifolds and oil pans.  Nylon 6/6 is also used in headlamp bezels and automotive cooling systems. Because nylon is lower in weight than metal parts, the automotive industry has turned to it to help lower fuel consumption.

Cable Ties

One of the most commonly recognized nylon 6/6 fasteners are cable ties.  These are used in electrical installations to bundle indoor electric wires and cables.  Cable ties come in many materials but nylon is used the most. Cable ties have an operating temperature range of -40 to +185 F and a UL 94V-2 flame.

Nylon 6/6 Fasteners

While most of the nylon material produced each year world wide is made into cloth or carpets, it is also an important engineering plastic with millions of standard nylon fasteners and components produced each year. Parts include nylon fasteners such as machine screws, hex nuts, flat washers, set and grub screws, hex head cap screws, etc.  Nylon 6/6 is used to make gears, bushings, rollers, etc. and many custom parts because of its high wear resistance.  It is used for its dielectrics strength in the electronics industry including printed circuit board hardware.

Tolerances

Unlike other high performance plastics, nylon parts are often molded in large quantities and may be available from stock.

However, if tight tolerances are required in your application, then machined or turned parts may be necessary.  Machined nylon fasteners and components have a tolerance of  about +/- .005.  Molded parts can a range from +/-.005 to as much as +/-.090 depending on the part and the size. 

Is Nylon Fire Retardant?

Nylon 6/6 has a UL 94 V-2 rating.  94V-2  is a UL test rating in which a specified test specimen stops burning within 60 seconds after two applications of ten seconds each of a flame with flaming drips allowed. So  nylon fasteners melt rather than burn when in contact with an open flame.

Nylon Absorbs Moisture

Nylon absorbs more moisture than most polymers.  Its impressibility is affected by this characteristic. However, nylon’s impact strength and general energy absorbing qualities actually improve as it absorbs moisture.

Parts, prints or problems?  Contact us at Craftech®Industries, Inc. Hudson, NY.

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