REMFORM® Thread-Forming Fasteners
REMFORM®
Thread-Forming Fasteners for Plastics & Light Alloys
REMFORM®
REMFORM® fasteners help lower the cost of assembly in engineered plastic materials. By eliminating weight while providing the requisite fastening performance, REMFORM® fasteners create value for designers, manufacturers and end users.
REMFORM® fasteners combine a thread form that promotes efficient material flow during thread-forming while also creating exceptional
resistance to pullout forces. REMFORM® fasteners’ ability to create high quality internal threads while minimizing the risk of boss bursting in the assembly process makes them an excellent thread-forming fastener.
Users who standardize on REMFORM® fasteners for plastic and light alloy material applications find efficiencies in:
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Research and Development
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Fastener acquisition
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Logistics
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Manufacturing
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After-market sales and service
REMFORM® fasteners are used to assemble a broad range of products across a multitude of industries globally. REMFORM® fasteners can be found in products including but not limited to cars, toys, furniture, cell phones, fitness equipment, printers, photocopiers,
hedge trimmers and countless other products.
The original REMFORM® screw first featured the unique asymmetrical thread profile that minimizes radial hoop stress to reduce boss bursting. The narrow tip angle also reduces stress in the plastic nut member.
REMFORM® II™
As designers attempt to reduce weight and improve the strength of products, engineered plastics become an increasingly prevalent material choice. REMFORM® II™ fasteners are the solution for joining these materials.
The REMFORM® II™ screw is a thread-forming fastener with a unique thread form to provide superior performance in a wide range of engineered plastics. The asymmetrical thread minimizes radial hoop stress to reduce boss bursting. The narrow tip angle also reduces stress in the plastic nut member.
Reduced Hoop Stress
The radial tip thread crest of REMFORM® II™ screws reduces sharp corners, which reduces radial hoop stress in the plastic caused by thread-forming. When a threaded fastener is tightened, nearly all of the axial tightening load is opposed by the trailing or pressure flank of the screw and the mating thread flank of the internal thread. The steep pressure flank transfers most of the resultant tightening load in the axial direction, minimizing boss bursting tendencies created by the radial force. The axial force is over 4.5 times greater than the radial force.
The Unique Radius Flank™ Thread Form
REMFORM® II™ screws employ the Unique Radius Flank™ asymmetrical thread form shown in the drawing to the left. The leading thread flank is most influential in forming the mating thread. The intercepting radius form on the leading flank is there to promote efficient material displacement and material flow. The pressure flank which opposes the fastener head is engineered to resist pull-out forces, whether they be applied by a tensile load or induced by torque. The steep pressure flank has a subtle radius designed to increase resistance to pullout and to efficiently develop tension. It also provides excellent material contact resulting in a high resistance to the internal threads stripping.
In applications where the failure mode is fastener fracture, the high torsional strength of REMFORM® II™ fasteners ensures a high failure torque and improved resistance to loosening. This unique thread form and its narrow tip angle efficiently displace material and therefore require minimal energy to form an internal thread. The tip also utilizes a radius to better create the internal thread without increasing hoop stress in the plastic.
REMFORM® II HS™
As designers attempt to reduce weight and improve the strength of products, engineered plastics become an increasingly prevalent material choice. REMFORM® II™ fasteners are the solution for joining these materials.
The REMFORM® II™ screw is a thread-forming fastener with a unique thread form to provide superior performance in a wide range of engineered plastics. The asymmetrical thread minimizes radial hoop stress to reduce boss bursting. The narrow tip angle also reduces stress in the plastic nut member.
REMFORM® II HS™ fasteners were developed to combine the features of REMFORM® II™ and REMFORM® II F™ fasteners with an optimized gap between the threads and core diameter. These optimizations allow a better flow of the mating plastic material and accept a higher amount of material between the flanks. This reduces overstressing of the plastic material during the assembly process.
The optimized core diameter provides a higher torsional strength, advantageous when the fastener is used in higher strength or fiber-reinforced materials. In applications with higher axial thread engagement, the optimized pitch allows more threads to be in contact with the plastic material.
The REMFORM® II HS™ fastener also uses the Unique Radius Flank™ asymmetrical thread design which is the standard for all REMFORM® fasteners.
