PLASTITE® fasteners are a legacy product of REMINC & CONTI. These fasteners were designed before the advent of modern engineered plastics. Since then, the plastics industry has evolved to create alloy and blended resins that require more from thread-forming screws . As a response, the engineering team at REMINC | CONTI created REMFORM® II™ fasteners. REMFORM® II™ fasteners are the modern product engineered to work with a wider variety of modern polymer materials common in today’s advanced assemblies.

REMFORM® II™ fasteners are a versatile fastener designed to handle a wider variety of modern and traditional plastics used in various end-use applications, including automotive interiors, consumer electronic devices, consumer products, and more.

Understanding REMFORM® II™ Fasteners

Geometry

  • Round-body
  • Wide pitch spacing
  • Asymmetrical thread form
  • Radiused leading thread flank

Metallurgy

  • Material-low-to-medium carbon steel; 0.18 C minimum
  • Neutral harden to HRC 33-39 (Vickers 327-382) hardness
  • May be neutral hardened to lower hardness levels when appropriate
  • Case hardening is optional
  • Stainless steel is also suitable; typical grades are 410, 430, 302, 304, 316, A2 with 302 being the most popular grade in North America, A2 in Europe

Key Components

Reduced Hoop Stress: To reduce radial hoop stress in plastics caused by thread-forming, REMFORM® II™ fasteners implements a proprietary radial tip thread crest. The radial tip thread crest ultimately reduces the stress caused by sharp corners used in traditional fasteners for plastics. 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.

Unique Radius Flank™

REMFORMII Radius Flank Profile

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 trailing 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 requires 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.

    Optional Configurations:

    Gimlet Point: available with a CA style point, which may be useful in protruding through flash or hole locating.

    Application Examples: REMFORM® II™ 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.

    For more information, please download our REMFORM®II™ Documents: