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Liquid Nitriding

Liquid nitriding is a subcritical surface enhancement process with one of the longest track records of success of any case hardening technology.

PVD Coatings

PVD coatings involve the deposition of thin (2-10 microns; 0.0001" – 0.0004") films on the surface of tools and components.

Engineered Bushings

HEF bushings are recognized worldwide for their excellent frictional and anti-seizure properties, and ability to withstand high loads.

TESCO Sleeve Bearing

TESCO high-temperature sleeve bearing

A TESCO sleeve bearing is manufactured from alloy steel with a core hardness higher than 50 RC, and a thermochemical surface treatment that imparts a case hardness higher than 800 HV. The surface treatment contributes excellent frictional properties and scuffing resistance, along with high surface hardness, even at sustained run temperatures up to 500°C.

The TESCO high-temperature sleeve bearing is ideal for both oscillation and rotation, and for applications that involve high loads. In addition to high-temperature bushings, Tesco treatments from HEF are available for pins, rollers, slides, screws and other complex parts.

Note: lubrication of a TESCO high temperature sleeve bearing greatly enhances technical performance. For information regarding high-temperature greases, contact HEF.

    Dyn. Load
N/mm2)		 Max Speed (m/s) Max Temp (°C) Abrasion resistance Shock resistance Corrosion resistance Low-Maintenance
TESCO® 100 0.5 +500°C +++ + ++ ++

Mating Shaft:
For optimal performances of the joint, the surface roughness should be inferior to 0.8 μm Ra. Shafts hardened for 56 to 60 HRC are recommended. HEF propose TESCO HT pins.

Advantages: Applications:
  • Excellent resistance to wear and seizure
  • Excellent resistance to temperature
  • Steel industry
  • Cement industry
  • Glass industry