Rapid Search

Find SPIROL products fast.

Optimal Application Engineering

Design the most cost effective fastening solution.

Your Location

For best online service, please change location if not correct.

Your Language

Please select your preferred language.

SPIROL Introduces New Threaded Inserts for High-Strength Molded-In Applications

DANIELSON, CT, USA - SPIROL has introduced a new line of standard inch and metric threaded Inserts for plastics.  These new Molded-In Series of Inserts feature a central hexagonal band, generous head-side bearing surface area and wall thickness designed to exceed clamped joint forces associated with Grade 5 and Class 8.8 heat-treated fasteners.

SPIROL® Series 41 and Series 45 Inserts utilize a unique centrally located hex retention feature.  This location positions the active retention features of the Insert along the installed threaded length of the screw and allows the Insert and mating fastener to act as a single unit. The relocation of these features also allows for the use of oversized undercuts in the body of the Insert, which improves performance - resisting pull and rotational forces.

A clean circular head replaces the exposed hexagon shape found in conventional Molded-In Insert designs.   The exposed bearing surface allows for higher clamping force against mating components, and makes the Series 41 and 45 a perfect companion product to SPIROL’s Compression Limiters.

The Series 45 Inserts have a closed end, which seals the threaded internal diameter.  This Insert configuration is perfect for mold-in applications into thick plastic sections, or in mold locations where a sealing pin is not feasible.

The Series 41 design utilizes the same proportions as the Series 45, but incorporates a thru-hole design.  This Insert is perfect for applications where bolt length is imprecise, and for ease of installation due to the symmetrical shape of the Insert.

Both Series contain tight tolerance threads with precise internal diameters as a standard feature. This allows for improved geometric positional tolerance and facilitates proper alignment in application where stack-up tolerances are a concern.

While the most demanding high strength Insert applications focus on thread sizes in excess of ¼” or 6mm, Series 41 and 45 inserts are available in standard body sizes as small as #4 and M3 thread sizes to allow incorporation into all Molded-In Insert applications.

The combination of lean design, high performance and extended size range makes these new Series the perfect candidates for all molded-in applications.

For your convenience, here is a link to our new Inserts for Plastics Design Guide where you can find information about the many different series of Inserts that SPIROL offers.

SPIROL Engineers will review your application needs and work with your design team to recommend the best solution at the lowest total installed cost. It all starts with our Optimal Application Engineering process.  To start this process, please select Inserts in Plastic under the Optimal Application Engineering portal on the left hand side of this page.