Thread forming solution for (ultra) high strength materials
EJOT MAXXtip® combines a carbo-austempered shank with an ultra hard screw tip. This unique combination allows completely new options for direct fastening into (ultra) high strength materials.
Due to the carbo-austempered microstructure (strength similar to 10.9) in the load-bearing area MAXXtip® screws are insensitive to hydrogen embrittlement. Therefore, galvanic surfaces can be applied without tempering leading to a thread flank hardness of at least 750 HV* in the forming area.
*In case of Zn flake surfaces, baking leads to a reduced thread flank hardness in the forming area of at least 600 HV.
Main application field of EJOT MAXXtip®
(Ultra) hight strenght steel sheets (at least UTS of 1200 MPa) using the thread types:
- SHEETtracs®, up to 2 mm.
- Spiralform® analogous to DIN 7500
- Cast iron (GJS and GJL) using the Spiralform® thread type
Application example for high strenght sheets
The advatages of MAXXtip® become obvious when fastening plastic seat attachment parts to seat frames made of S700MC. Even in (ultra) high strenght sheets safe and reliable direct fastening can be achieved. The results in a significant reduction of working operations and costs.
Application example for cast iron
In case of cast iron (GJL or GJS) thread cutting can be omitted if MAXXtip® screws are used. Application fields can be found in the complete motor vehicle powertrain as well as in pumps, compressors or electric engines. A direct fastening into boreholes or cast holes is possible without any further preparations.