Technical Specifications for Shackles

1. Dimensional Parameters

The document provides detailed nominal dimensions for shackles, including:

• Bow Diameter (dn): Ranges from 6.5 mm to 46 mm depending on the Working Load Limit (WLL).
• Pin Diameter (Dn): Varies from 8 mm to 51 mm.
• Inside Width at Pin (Wn): From 12 mm to 60 mm.
• Minimum Eye Diameter (en): Between 15.5 mm and 100 mm.
• Minimum Inside Length of Dee Shackle (S): Ranges from 20 mm to 139 mm.
• Minimum Inside Length of Bow Shackle (S): From 27 mm to 168 mm.
• Minimum Inside Width of Bow (Emin): Between 19 mm and 119 mm.

2. Mechanical Strength Parameters

• Manufacturing Proof Force (MPF): Specified in kiloNewtons (kN), values range from 9.8 kN to 491 kN depending on the shackle size.
• Minimum Breaking Force (BFmin): Also in kN, ranging from 24.5 kN up to 1226 kN.

3. Tolerances and Manufacturing Notes

The document specifies tolerances for various dimensions based on the shackle size (expressed in tons, t):

• Bow Diameter (dn):
• For 0.5 t up to 2 t: +1.5/-1 mm
• For 3.25 t up to 12 t: ±2.5 mm
• For 13.5 t up to 25 t: ±3 mm
• Bow diameter may be oval with allowed increase of +10% for sizes 3.25 t to 17 t, and +25% for 25 t.
• Pin Diameter (Dn):
• For 0.5 t up to 2 t: ±1 mm
• For 3.25 t up to 25 t: ±2 mm
• Inside Width at Pin (Wn):
• For 0.5 t up to 2 t: ±2.5 mm
• For 3.25 t up to 9.5 t: ±3 mm
• For 12 t up to 25 t: ±4 mm

4. Summary

This technical data sheet defines the critical dimensions and mechanical strength requirements for shackles across a range of Working Load Limits. It includes precise tolerances to ensure manufacturing quality and safety compliance. The data supports selection and verification of shackles for lifting and rigging applications, ensuring they meet minimum proof and breaking force standards.