DTDM Long Nut for Connections

Specifications

undefined Material: Q235 Steel

undefined Surface Finish: RoHS-compliant Zinc Plating

undefined Applications: Designed for linear extension connections between two profiles. During installation, the nut is inserted into the slot at the junction of the two profiles and secured with a set screw.

undefined Environmental Compliance: RoHS compliant

Product Description

The high-strength DTDM long nut is made from Q235 steel and undergoes cold working and spheroidizing (soft annealing) to enhance its mechanical properties.

The internal hexagonal cylinder head bolts are produced using a cold-eye forming process, which directly reflects the steel’s forming capability. During cold working, the local plastic deformation of the part can reach 60–80%, requiring steel with excellent plasticity. The microstructure of the steel is critical: finer, spheroidized grains improve formability, while coarse plate-like pearlite reduces cold-work performance.

For medium-carbon and medium-alloy steels used in high-strength long nuts, spheroidizing annealing before cold working ensures a uniform, fine-grained spherical structure, significantly improving cold formability and reducing cracking during processing.

Typical annealing parameters:

undefined 35/45/ML35/Swrch35K steels: softening annealing at 715–735°C

undefined SCM435/40Cr/SCR435 steels: annealing at 740–770°C, isothermal at 680–700°C

This process ensures high-quality, durable, and reliable long nuts, meeting demanding industrial production requirements.