Reelfast Surface Mount Fasteners from PEM

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Since circuit boards were first invented the question of how to attach them to the rest of the assembly has been a problem which has been largely ignored. Loose hardware such as nuts and bolts are still used in large quantities, but with thread sizes typically M3 or less this is slow and fiddly work.

Broaching fasteners are commonly used which solves the problem to some extent, but it’s still another operation which needs to be done either before or after the electronic components have been attached. Importantly it increases the possibility of an expensive printed circuit board being damaged during processing.

ReelFast® from PEM® consists of a range of threaded nuts, standoffs, panel fasteners and right angle fasteners all of which are supplied on standard sized tape and reel suitable for use with the same equipment you use to populate the rest of the printed circuit board. Standard thread sizes for nuts and standoffs is M2 to M4, by using microPEM® parts thread sizes can be as small as M1. Panel fasteners can be supplied with M3 or M3.5 threads and the R’Angle® right angle mounting bracket comes with M2 to M4 threads. Using surface mount parts means that no mounting hardware is actually handled during the manufacturing process which increases product throughput and improves quality.

No special hole preparation is required and the fasteners are securely and permanently attached to the circuit board during the flow solder process. All ReelFast® fasteners are tin plated, RoHS compliant and compatible with current flow solder chemistry and standard pick and place machinery.

If you would like to reduce or even eliminate secondary operations and reduce bottle necks in your assembly process you must take a look at Reelfast® fasteners for your next – or even current – design. At Zygology we are experts on the products we sell. If you would like advice on incorporating ReelFast® into your production we would be delighted to hear from you.

The latest addition to the Reelfast family is the SMTSS which is a snap top standoff. New PEM® SMTSS™ Fasteners hold printed circuit boards securely in assemblies without the need for additional mating screws or other loose threaded hardware to complete attachment.  SMTSS unthreaded standoffs help to streamline production by simply installing in boards in the same manner and at the same time as other surface mount components prior to the automated reflow solder process. The mating board is then easily and securely snapped into place without any tools. SMTSS standoffs reduce assembly costs and enable precise and reliable mounting and spacing of boards using less hardware and fewer operations.
As with all Reelfast parts SMTSS standoffs are supplied on tape and reel compatible with existing SMT automated installation equipment.

PEM SMTSSS standoffs are manufactured from carbon steel and are available in imperial lengths 1/4″ or .3/8″ and metric lengths 6mm, 8mm, or 10mm.  They will install readily install in any standard printed circuit boards from as little as 1.53mm thick without any special preparation other than provision of a solder pad on the board.
For more information see the Reelfast product range on our web page


PEM Micro Fasteners for Electronic Assembly

As electronic assemblies continue to get smaller so the mechanical fixings have to cater for this. The PEM Micro range offers nuts, standoffs, Tack screws, pins and inserts for plastics all in micro sizes. Using PEM technology the use of these parts simplifies assembly and reduces the time required.

For more information see the Micro product range on our web page


PEM Broaching Fasteners for PCB Assembly

For lower volume applications PEM also has a full range of broaching and flaring fasteners which can be installed with a simple press. The range includes nuts, standoffs, snap Top standoffs, panel fasteners, SpotFast rivets and the PEM heat sink mounting system.

For more information see the broaching fasteners for PCB product range on our web page


About Zygology Ltd

As the UK’s primary distributor for Penn Engineering Zygology is uniquely placed to help you to incorporate this technology into your products. We have fully trained representatives based around the country ready to help you at every stage from initial informal discussions where ideas can be bounced around to assisting with the specification of specific products and providing product for trials. Our years of experience is at your disposal to ensure that you get the solution which is right for you.
With 40 years of experience Zygology is the country’s largest distributor for POP Avdel, Southco and Penn Engineering in the UK. We are in addition the UK distribution hub for Masterfix fasteners and tooling. Zygology has also recently been appointed as an official distributor for Tesa assembly adhesive tapes. We have in-house repair facilities for POP Avdel and Masterfix tools. Zygology Ltd has an in depth knowledge of the products we sell and how they can be best incorporated into yours. We will always give the best advice we can – even if this sometimes means that we end up recommending a competing technology. We combine friendly service with competitive prices and excellent stock availability.

For more details or to request a visit call us on 0808 123 1221 or email us at

Last modified: 31st August 2017