Monday, July 23, 2012

Chains (Campbell USA)

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Founded in 1919, Campbell is the largest manufacturer of welded and weldless chain in the United States. Users of Campbell chain can select from a wide range of working load capacities including proof coil, high test, transport and alloy; finishes including self-colored, Blu-Krome®, galvanized and bright color polycoated; links that are short, long, twisted, locked, looped, even stamped from flat stock. Several chain types are even available in solid brass and bronze. Campbell chains and assemblies, including slings for overhead lifting, and binder chains, have earned for the manufacturer an outstanding reputation for quality.

Camtrol System
Campbell’s CAMTROL SYSTEM makes chain products easier to identify and understand.  That’s because all are based on engineering formulas computed according to ISO (International Organization for Standardization), NACM (National Association of Chain Manufacturers) and ASTM (American Society for Testing and Materials).  Use the CAMTROL SYSTEM to make wise chain purchasing decisions.  Use it to compare the various categories of chain, to choose the right chain for the job according to the price per thousand pounds of working load instead of buying on a price per foot.

Variations in finish or heat treatment
The mechanical properties shown on the Camtrol Chart apply only to the various chains in their standard finish and heat treated condition.  Finishes such as galvanizing or electroplating may reduce strengths. The manufacturer’s revised recommendations should be solicited when such treatments are desirable for specific applications.

Hallmarking (Identification)
All System 4, 7, 8, and 10 chains and all System 3 chains 5/16” (8 mm) and larger are marked with the grade identifier approximately every 12” or less.  Please refer to the chain type of interest in this catalog for the specific hallmarks.

Important Chain Terms

The “working load limit” (rated capacity) is the maximum combined static and dynamic load in pounds or kilograms that should never be applied to the product in service, even when the product is new, and when the load is uniformly applied in direct tension to the product.

The “proof test” is a quality control test applied to chain for the purpose of verifying weld and material quality.  It is the minimum force in pounds or newtons that the chain has withstood in direct tension as part of the manufacturing process.  Proof testing assures that the chain is more than capable of performing at its rated working load limit.  Proof test loads are a manufacturing integrity test and shall not be used as criteria for service or design purposes.  All Campbell proof tested chain and components are proof tested in accordance with the applicable ASTM, NACM and AISI/ASME requirements.

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