ringbolt

• ring bolt
• ring-bolt

From ring +‎ bolt.

ringbolt (plural ringbolts)

1. an eyebolt with a captive ring passing through it
   • 1840, R[ichard] H[enry] D[ana], Jr., “CHAPTER XXXV”, in Two Years before the Mast. […] (Harper’s Family Library; no. CVI), New York, N.Y.: Harper & Brothers […], →OCLC:

     The anchors and ring-bolts, and other iron work, were blackened with coal-tar

• ringbolt hitching

• “ringbolt”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• trobling