The old adage does not prove true with Alloy Sling and Chain because there is no “weakest link”. All chain and links are inspected and assured of their strength and reliability throughout the process. The chains we sell are of the highest quality carbon and alloy steel meeting all of the specifications that cover steel chain for commercial quality and other uses.
Some of the chains that are available through ASC are as follows: System 3, 4, 7, 8 and 10 as well as Grade 50 Type 316L Stainless Steel Lifting Chain Program. The newly revised (July 5, 2011) Federal Specification covers the following chains and we are pleased that all the chain sold to our customers meets these new requirements and are available to you from Alloy Sling and Chain.
The RR-C-271F replaces the now-obsolete RR-C-271E from December 2010. The 45 page revision covers the following classes and styles that ASC is also able to provide for Type I welded steel chain:
Class 1 – Alloy chain (overhead lift), Class 2 – High-test chain, Class 3 – Transport chain, Class 4 – Proof-coil chain and for Class 5 – Twist-link chain – Style 1 – Long-link pattern (coil) and Style 2 – Short-link pattern (machine)
For Type II weldless (forged and casting) chain, the following classes are included:
Class 1 – Single-loop pattern chain, Class 2 – Double-loop pattern chain, Class 3 – Sash chain, Class 4 – Flat-link chain, Class 5 – Bead chain, Class 6 – Plumber’s chain, Class 7 – Single-jack chain, Class 8 – Double-jack chain, Class 9 – Ladder chain, Class 10 – Register chain, and Class 11 – Mechanical communication chain.
The “working load limit” (rated capacity) is the maximum combined static and dynamic load in pounds or kilograms which should ever 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 proof tested chain and components are proof tested in accordance with the applicable ASTM, NACM and AISI/ASME requirements.
Chain products and components are designed and built for rugged lasting service. As with any quality product certain precautions and standards of treatment should be observed. Proper care will extend the useful life of the product.
Components, such as hooks or shackles, should have at least the same working load limit (rated capacity) as the chain with which they are used. If not, the assembly shall be rated to the capacity of the weakest component.
Regular inspections should be conducted on chain to detect damage or deterioration from use. The chain should be inspected for any of the below conditions. If present, the chain should immediately be removed from service.
To protect the users and to prevent damage to the chain, the following safe practices should be followed: