I tried to find a chart on chain working load limits. You have to be careful with D.O.T. rules.The good chains have the grade stamped on them. You need at least a grade 7. It will be stamped on the chain. Mike
Most Common Types Of Chain
Stainless Steel Chain
Uses: Food processing, chemical and marine applications, and wherever non-magnetic, electrically welded, corrosion resistant chain is needed. DO NOT USE FOR OVERHEAD LIFTING. Minimum elongation 15%. Proof tested.
Proof Coil Chain (Grade 30)
Uses: Excellent general purpose chain of standard commercial quality for all ordinary applications not requiring high strength-to-weight ratios. Frequently used for fabricating tow chains, binding or tiedown chain and logging chains. DO NOT USE FOR OVERHEAD LIFTING. Minimum elongation 15%. Proof tested.
High Test Chain (Grade 40)
Uses: Designed for use in load binding, towing, logging and other applications requiring higher strength-to weight ratios than System 3. DO NOT USE FOR OVERHEAD LIFTING. Minimum elongation 15%. Proof tested.
Transport Chain (Grade 70)
Uses: Designed for use in load binding, towing, logging and many applications requiring higher strength-to weight ratios than grade 40. grade 70 meets stringent DOT regulations with smaller chain that is lighter in weight and easier to handle. DO NOT USE FOR OVERHEAD LIFTING. Minimum elongation 15%. Proof tested.
Aluminum Chain
Uses: Chemical processing, explosives manufacturing, petroleum refining, food processing, landscaping and crowd control, wherever a non-magnetic non-sparking chain is needed. Ideally suited for applications requiring optimum strength-weight ratios and maximum resistance to atmospheric and salt water corrosion. NOT TO BE USED FOR DYNAMIC LOAD CONDITION. DO NOT USE FOR OVERHEAD LIFTING. Proof tested. STANDARD MATERIAL: 5056 aluminum-magnesium alloy.
Grade70 Fishing Chain
Uses: Designed to accommodate all types of chain need s in the trawling industry. DO NOT USE FOR OVERHEAD LIFTING. Minimum elongation 15%. Proof tested.STANDARD MATERIAL: High strength heat treated steel which resists shock loading and corrosive elements.
System 8, Alloy Chain
Uses: SPECIFICALLY RECOMMENDED FOR OVERHEAD LIFTING and applications which demand a combination of minimum weights and high working load limits. Elongates in excess of the 15% minimum requirement. Proof tested. STANDARD MATERIAL: Alloy steel, heat treated.
Grade 100
Uses: 25% Stronger than Grade 80 Alloy, Allows downsizing of chain and components resulting in less sling weight and increased mobility. Grade 100 chain Components are avaiable for supply. For detail please contact us by email:
[email protected] or tel:86 532 88668543 or fax:86532 82737869
Straight Link Machine Chain
Uses: General utility farm and animal. DO NOT USE FOR OVERHEAD LIFTING.