Lubricant-free adjustment of high loads with new igus polymer threaded nut

Plastic and high loads? This time igus proves that the combination works with a new threaded nut design. The polymer nut dryspin JGRM from injection molding offers a cost-effective alternative to ball screw nuts. The new design can move high loads without lubricant and wear-resistant. For higher axial loads, the new nut is also available with a stainless steel plate as a “heavy duty version”.

Whether in construction machinery, in the actuator or in the solar tracker: spindles must be able to adjust high loads safely and durably in a wide variety of applications. igus has now developed a new threaded nut for precisely this application. “The new JGRM series is a robust alternative to ball screw nuts,” says Thorben Hendricks, business unit manager for thread technology at igus GmbH. “The new design of the nut distributes the radial and axial loads so that we can absorb higher forces in contrast to conventional flange nuts”. The new design is based on the connection dimensions and pitches of ball screws and can therefore be easily exchanged. The nut offers a wide range of installation options: it can be screwed on or screwed off or mounted in a bore hole. The thread-centering shoulder, the anti-rotation feature with wrench flats and the use of four M6 cylinder head screws help during installation. The nut is manufactured by igus itself using injection molding in Cologne, so it is very light and cost-effective. Compared to ball screw systems, the polymer threaded nut costs just half as much. Due to the use of iglidur J high-performance polymers, the nut has very low coefficients of friction. The rounded thread flanks and the omission of balls make the thread particularly smooth running. In addition to this, the threaded nut does not require external lubrication, which could get into the environment, due to the use of dry lubricants. “This allows us to offer customers a maintenance-free solution that is insensitive to dust and dirt,” says Hendricks.

Heavy Duty version for greater safety with higher axial loads
For higher axial loads, igus has also developed the JGRM threaded nut as a heavy-duty variant with a stainless steel plate. The flange dimension remains identical. The stainless steel plate is mounted on the nut and thus increases the bearing surface for force dissipation. The screw heads no longer rest on the plastic. Tests in the company’s own 3,800 square meter test laboratory showed that the Heavy Duty variant can absorb up to 6 MPa and thus 50 percent more load than a comparable plastic flanged nut. The new threaded nut is available for all thread types with a diameter of 14 to 20 millimeters. It achieves its highest efficiency on the patented asymmetrical dryspin thread from igus.

For more information, please visit: https://www.igus.eu/