1. How to calculate the maximum pulling force of the anchor chain accessory shackles?

The maximum pulling force is the product of the safe load and the safety factor. 

How to calculate the breaking force of the anchor chain accessory shackles?

The anchor chain accessory shackles have safety factors, such as 2 times, 4 times, 6 times, etc. For example, for an anchor chain accessory shackle with a safe load of 2 tons and a safety factor of 4, the breaking force of this anchor chain accessory shackle is 8 tons. 

II. Test of Breakage Tension of Anchor Chain Attachment Buckles and Hooks

S6-grade threaded shaft type (D-shaped) bow-shaped anchor chain attachment buckle

Test requirements: The test load is 2 times the ultimate working load, and the minimum breakage tension load is 6 times the ultimate working load

Standard: ASTM E B 30.26-2004 standard, Federal Specification RR-C-271D

T8-grade threaded shaft type bow-shaped anchor chain attachment buckle

Test requirements: The test load is 2 times the ultimate working load, and the minimum breakage tension load is 4.5 times the ultimate working load

Standard: ASTM E B 30.26-2004 standard, Federal Specification RR-C-271D

T8-grade bolt shaft type bow-shaped anchor chain attachment buckle

Test requirements: The test load is 2 times the ultimate working load. For 200-400 ton anchor chain attachment buckles, the minimum breakage tension load is 4 times the ultimate working load; for 30-175 ton anchor chain attachment buckles, the minimum breakage tension load is 5.4 times the ultimate working load

Standard: ASTM E B 30.26-2004 standard, Federal Specification RR-C-271D

Wide-body anchor chain attachment buckle

Cast alloy steel anchor chain attachment buckle from 7 to 300 tons, forged alloy steel anchor chain attachment buckle from 400 tons to 1500 tons.

Test requirements: For anchor chain attachment buckles below 300 tons, conduct a test load of 2 times the ultimate working load; for anchor chain attachment buckles above 400 tons, conduct a test load of 1.33 times the ultimate working load.

The breakage load of anchor chain attachment buckles below 300 tons is 5 times the ultimate working load, and the breakage load of anchor chain attachment buckles above 400 tons is 4.5 times the ultimate working load.

Standard: ASTM E B 30.26-2004 standard, Federal Specification RR-C-271D

Ring eye hook

Ring eye hook 1.25t - 31.5t: Test load is 2.5 times the ultimate working load, design safety factor is 4 times.

Ring eye hook 37t - 60t: Test load is 2 times the ultimate working load, design safety factor is 4 times.

Standard: ASTM E B 30.10-2009 standard.

Rotary hook, classification hook

Rotary hook: Test load is 2.5 times the ultimate working load, design safety factor is 4 times.

Standard: ASTM E B 30.10-2009 standard

Summary: The maximum tension test generally represents the maximum tension force that the sample withstands until it breaks in the tensile test. The result is expressed in MPa, or can also be expressed in KG, N, etc. Different from the tensile strength of stainless steel and other steel sheet materials, this maximum tension test cannot obtain the elongation after breakage and other parameters. 

III. Approximate Formula for Force Calculation of Anchor Chain Attachment Buckles and Its Application

The selection of anchor chain attachment buckles is generally based on standards or product catalogs. If design calculations are required or if the anchor chain attachment buckles of unknown tonnage need to be accounted for, the following methods are often adopted: The body of the anchor chain attachment buckle is regarded as half of a chain link, and the calculation is performed using the formula for curved beam bending; the cross pins are calculated based on concentrated loads at both ends of fixed supports. This task is usually handled by engineering technicians. For workers or for temporary selection on-site, it becomes difficult and unsuitable. Therefore, the calculation formula must be simplified to obtain an approximate formula to meet the needs of timely selection on-site. 

IV. Scraping Standards for Anchor Chain Attachment Buckles

If any of the following situations occur with the anchor chain attachment buckles, the components should be replaced or the product should be scrapped.

If the shape of the anchor chain attachment buckle twists by more than 10%, the component should be replaced or scrapped.

If rust and wear exceed 10% of the nominal size, the component should be replaced or scrapped.

If there are cracks in the anchor chain attachment buckle and the pin shaft after flaw detection, the component should be replaced or scrapped.

If the anchor chain attachment buckle and the pin shaft undergo obvious deformation, the product should be scrapped.

If there are cracks and scratches visible to the naked eye, the component should be replaced or scrapped.

To ensure the safe use of anchor chain attachment buckles Please regularly check the operation of the anchor chain accessory shackles. If they become unusable, replace them immediately to ensure production safety.