Electroless Nickel Plated ENP Fasteners

Stud Bolts, Nuts, Screws, Threaded Rod & Washers

Electroless Nickel Plating Fasteners are coated by a chemical process that deposits an even layer of nickel-phosphorus or nickel-boron alloy on the surface of a solid substrate, like metal or plastic. The process involves dipping the substrate in a water solution containing nickel salt and a suitable reducing agent.
Unlike electroplating, the process does not require passing an electric current through the bath and the substrate; the reduction of the nickel cations in solution to metallic nickel is achieved by purely chemical means. Thus EN plating creates an even layer of metal regardless of the geometry of the surface in contrast to electroplating which suffers from uneven current density due to the effect of substrate shape on the electric field at its surface.

Properties Of Nickel...Lubricity Of PTFE...Repeatable Coating Of Uniform Thickness

Electroless Nickel-PTFE is a nickel-phosphorous-polytetrafluoroethylene (PTFE) co-deposit on metal substrates. The process yields a surface with the engineering properties of nickel and the additional lubricity of PTFE.

Electroless Nickel Plated (ENP) Fasteners Properties

Properties Electroless Ni-P Hard chromium
Melting point (°C) 890 1610
Internal stress on steel (MPa) < 7 200-300
Electrical resistivity (|iWm) 0.9 0.14-0.66
Thermal conductivity (W/mK) 8 67
Modulus of elasticity (GPa) 200 100-200
Elongation (%) 1-1.5 <<0.1
Coefficient of thermal expansion (10 - 6 /°C) 12 6
Adhesion strength (MPa) 300-400 Good
Tensile strength (MPa) > 700 < 200
Hardness (HV 0.1 ) 480-500* 800-1000
Coefficient of friction versus steel (lubricated) 0.13 0.16
Taber wear resistance (mg/1000 cycles) 15-20 + 2-3

Electroless Nickel Plating (ENP) Specifications

  • AMS 2404
  • AMS C26074
  • ASTM B733
  • ASTM B656
  • MIL-DTL-3211
  • MIL-C-26074
  • AMS-2404 El