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Stainless steel anchor shackle designed for the job:

  • A flush hex head allows for smooth passage through the bow roller
  • A socket wrench or a crescent wrench could be easily used to open or close the pin even after many months of use.
  • A hole in the hex head is designed to safety wire the pin to prevent pin loosening.
  • Mantus shackles are forged and use high quality 316 stainless steel.

Galvanized anchor shackles with Breaking Strength six times the working load limit:

Working Load Limit (lbs) Recommendations* Ultimate Breaking Strength (lbs)
Size Galvanized Hi-Test Shackles 316 Drop Forged Stainless Shackles Hi Test G4 Chain (artificially inflated use the bold number) G3 Chain Proof-coil,BBB Galvanized Hi-Test Shackles 316 Drop Forged Stainless Shackles Hi Test G4 Chain G3 Chain Proof-coil,BBB
1/4 1,000 1,000 2,600/1,950 1,300 5,000  5,000 7,800 5,200
5/16 1,500 1,300 3,900/2,900 1,900 9,000  6,500 11,700 7,600
3/8 2,000 1,500 5,400/4,050 2,650 12,000  7,500 16,200 10,600
7/16 3,000 2,000 7,200/5,400 N/A 18,000 10,000 21,600 N/A
1/2 4,000 3,000 9,200/6,900 4,500 24,000 15,000 27,600 18,000
5/8 6,500 4,000 39,000 20,000
 *These are manufacturer’s recommendations and often differ from one marine manufacturer to another, our shackles are strong enough to use with Hi Test Chain, just pick one size larger than the chain.
 *The working load limit  called out on our shackles is 1/6th of the breaking strength vs  the ratio of 1/5th for the Grade A shackles.  So when sizing our shackled it is more useful to compare the ultimate breaking strength of the   shackle to that of the chain.
Using stainless steel shackle with galvanized chain:
  • When sizing a stainless steel shackle for your anchor and Grade 30  galvanized chain, pick a shackle one size larger than the chain and  the shackle will be the same strength as the chain.
  • When sizing a stainless steel shackle for your anchor and Grade 40  galvanized chain, only a shackle one size larger will fit and the shackle will be 60 – 70% the strength of the chain, we recommend to using a mantus swivel to match the strength of the shackle connection to that of the Grade 40 chain.

Using galvanized shackle with galvanized chain:

  • When sizing a galvanized steel shackle for your anchor and Grade 30 galvanized chain, pick a shackle the same size as your chain.
  • When sizing a galvanized steel shackle for your anchor and Grade 40 galvanized chain, pick a shackle one size larger than the chain and  the shackle will be the same strength as the chain.