There are many different thread styles that are used in the PVC fittings industry. The following explains several of the commonly used thread styles and their sensitivity to bending loads. The styles covered are the standard "V" thread, buttress thread, and the ACME thread. Crank Handles Our crank handles are available in a variety of different styles and are ideal to use on machinery with rotating parts.

The same purpose that caps serve for hydraulic fittings, but protection plugs prevent dust, moisture, and dirt ingress – and the ensuing corrosion – from damaging internal threads.

Bolt/Nut Caps & Plastic Fittings Our extensive range of bolt caps and plastic fittings are prefect for shop fitting and furniture applications. Fastenright thread forming screws for plastic (FasPlas) are designed for use on thermoplastic materials, and will slice through plastic with minimal stress and low installation torque. The ACME thread has a configuration that eliminates the "V" notch. It is a specialty thread that provides clearance with all diameter piping while contributing high strength. The ACME thread is less sensitive to bending loads because there is no "V" notch. The right way to assemble a threaded PVC joint-Schedule 40 or 80 is finger tight plus one to two turns-no more. Two turns past finger tight plus the stress of the system pressure is within the tensile strength of one-inch PVC. The working pressure of PVC pipe is based on a 2000 psi stress level. What this means that a 1 inch female threaded connection is exposed to 7,364 psi hoop stress when tightened just three turns past finger tight and under at the rated working pressure of the pipe. As you can see, in this case the connection is on the verge of failure.

When working with threaded plastic fittings do use a proper sealant. The right sealant for threaded joints is non-hardening, compatible with plastic and doesn't add slipperiness. Adjustable Feet Our range of adjustable feet are ideal for office furniture, point of sale products and catering equipment. Finally, a sealing compound must not lubricate the joint to the point that over-tightening is encouraged. Several sealants on the market meet all these requirements. Let’s face it: Screw threads were originally designed for metal parts, and were standardized long before plastic injection molding became mainstream. This has created a few challenges for plastic part designers. The first is that the classic, 60-degree V-style thread seen in the fastener aisle of your local hardware store is relatively shallow. This isn’t a problem when parts are made of strong, tough metal. But those made of plastic tend to strip more easily, especially on fine pitch threads or those the size of a pencil or smaller. That’s why Protolabs recommends that internal threads should be no smaller than 0.3 in. (7.6mm) in diameter, and recommends using the coarsest pitch possible (regardless of size) for your design. Using Undercuts for Molded Threads Wing & Thumb Knobs We have a huge selection of wing and thumb knobs which are ideal for use on leisure equipment, medical equipment and HVAC products.Because the threads are tapered, additional turns cause the female part to stretch or undergo "strain." This will split the female fitting just as a wedge, driven by a sledgehammer, will split a tree stump. Finally, don’t forget that there’s more than one way to skin the proverbial cat. If finding the perfect threaded-part design eludes you, remember that Protolabs might be able to machine your threads in a secondary operation more cost-effectively than trying to mold them, at least on smaller quantities. You could also consider using self-tapping screws or an overmolded thread insert as an alternative. Many plastic piping system installers who encounter problems with splitting assume Schedule 40 fittings are weak. They conclude that the problem can be solved by switching to "stronger" Schedule 80 fittings. There are several fallacies in this reasoning. Our Threaded Protection Caps are made using a strong, quality HDPE Plastic, which is capable of resisting damage and preventing external threads from becoming broken, frayed, or damaged. Each of these Plastic Threaded Caps come with an ergonomic easy gripping head, allowing for fast, efficient screwing on and off from the application.

Our Thread Covering Caps are most commonly used to cover and protect threads whilst in transit. They can also be used for masking purposes to cover and protect a thread whilst coating. Today, there are millions of miles of plastic piping with threaded fittings, providing reliable, leak-free service. However, a tiny percentage of those threaded plastic fittings may leak or break. The reason for this is improper assembly of threaded joints. Transitions from plastic piping may be made with flanges, threaded fittings, or unions. Flange connections are limited to 150 psi and threaded connections are limited to 50% of the rated pressure of pipe. PLASTICS PIPE INSTITUTE (PPI)A Division of The Society of The Plastics Industry, Inc. 250 Park Avenue, New York, New York 10017 (212) 687-2675 Prohibition Signs & Hazard Signs We have a wide range of prohibition and hazard signs available for immediate despatch.

Multisert®

Threaded fasteners, such as bolts and nuts, have a huge role to play in many industries. Their impressive clamp load means they are the ideal fastener for use across a wide range of manufacturing and maintenance applications. However, these types of assemblies can fail over time as they work themselves loose, thanks to vibration, bending, or thermal expansion. These vinyl caps provide a high-gloss, attractive finish making them ideal for use as decorative end caps. The flexibility and durabilityallowssuitable fit for multiple applications. They can be used as a mask for coating, plating and paint applications, where the maximum temperature is not higher than 350F. Tube Connectors We have an extensive range of tube connectors which are ideal for retail display products and educational furniture. Metal Fixings & Fasteners We have a wide range of fixings and fasteners which are available in nylon, steel and stainless steel. Vinyl End Caps, commonly known as Flexicaps or PVC End Caps. A round cap that protects the outside diameter of threaded or non-threaded tubes, rods, pipes or paper tubes. The vinyl material can stretch on to larger dimensions for a tight fit without tearing, splitting or shredding.