The Complete Guide to Chain

1.4 Environmentally Resistant Chains

These are chains that offer high resistance to corrosion or heat due to special coatings or materials. The approximate relationship between these chains is shown in Figure 1.10.

Table 1.6 shows a variety of environmentally resistant chains and materials.

Figure 1.10 Environmentally Resistant Chains
Figure 1.10 Environmentally Resistant Chains

NOTE: The chains surrounded with a thick line have a temperature range of −20°C to 400°C. Before using these chains in temperatures outside this range, contact the manufacturer.

In this Figure, the left-to-right direction shows the relative corrosion resistance (right is more resistant than left). The average tensile strength or maximum allowable tension may differ even between chains of the same size.

Table 1.6 Chains for Special Environments
Series Treatment Special Features and Applications
NP Nickel-plated
  1. Maximum allowable load about 10% less than RS Chain.
  2. Use SS in applications that contact food.
WP® Special coating
  1. Maximum allowable load same as RS Chain.
  2. Better than NP in wet applications.
  3. Use SS in applications that contact food.
SS 304SS
  1. Typical anti-corrosion chain.
  2. Food, chemical, and pharmaceutical environments.
NS 316SS
  1. Very corrosion resistant.
  2. Maximum allowable load same as SS Chain.
AS Precipitation-hardened stainless + 304SS
  1. Maximum allowable load 50% higher than SS Chain.
  2. A little less anti-corrosive than SS.
PC 304SS + engineered plastic bushing link (white)
  1. Low noise (5 dB less than steel chain).
  2. Light weight (50% less than steel chain).
PC-SY Titanium + special engineered plastic bushing link (glossless)
  1. Resists chemicals, including hydrochloric and sulfuric acids.
  2. Suitable when stainless steel cannot be used.
TI Titanium
  1. Nonmagnetic and high resistance to corrosion.
  2. Light weight (50% less than steel chain).
Table 1.6 Chains for Special Environments (cont.)
Series NP WP® SS NS AS PC PC-SY TI
Conditions Water • • • • •     •
Sea Water   • • • •     •
Sanitary     • • • • • •
Chemicals, Acid, Alkalis, Corrosives     • • • • • •
Low/High Temperatures     • • •     •
Non-Magnetic       •     • •
Lube-Free           • •  
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