DescriptionHow to Select Hoist Rings

 

Hoist rings are load-centering eyebolts. They are designed to be rigged from the center or the side and may pivot or swivel.

 

Types

 

Some hoist rings connect directly to webbing, chain, or shackles. Others have a hook-end rather than a standard bail, eye, or ring. Basic types of hoist rings include:

 

  • Center-pull hoist rings are designed to be rigged from the center and should not be set up to be pulled from the side.
  • Side-pull hoist rings are designed to be rigged from the side and should not be set up to be pulled from the center.
  • Screw-mount lifting rings are hoist rings with a fixed base. They have mounting holes for screws. In terms of movement, pivoting hoist rings have an eye that is designed to pivot 180°.

Specifications

 

Product specifications for hoist rings include:

 

  • Maximum load capacity
  • Threaded length
  • Overall bail length
  • Overall bail width
  • Bail radius
  • Bail thickness
  • Weight

Material

 

Metallic hoist rings can be made of:

 

  • Aluminum - Lighter than steel, but not as strong.
  • Brass - Common copper-base alloy.
  • Bronze - Common copper-base alloy.
  • Steel and hardened steel - Many different grades of carbon steel and alloy steel are used as fastener materials.
  • Stainless steel - Stainless steel may not require anti-corrosion coatings, but cannot be hardened to the same degree as carbon steels.
  • Titanium - A metal that is used widely in the aerospace industry, titanium is suitable for specialized applications.
  • Proprietary alloys

FinishHow to Select Hoist Rings

 

In terms of finish, hoist rings are often:

 

  • Anodized.
  • Galvanized.
  • Plated with gold, silver, tin, or zinc.
  • Coated with black oxide which causes virtually no dimensional change.
  • Coated with phosphate which provide corrosion resistance and a better surface for the adhesion of primers and paints.
  • Finished with zinc chromate.


Thread Length


Thread sizes for hoist rings are measured in English units such as inches (in) or metric units such as millimeters (mm).

 

Inch-based measurements for rings include:

 

  • 1/4"
  • 5/16"
  • 3/8"
  • 7/17"
  • 1/2"
  • 5/8"
  • 3/4"
  • 7/8"
  • 1"
  • 1 1/8"
  • 1 1/4"
  • 1 3/8"
  • 1 1/2"
  • 1 3/4"
  • 2"
  • 2 1/4"
  • 2 1/2"
  • 2 3/4"

Fasteners designated as #16, #18, #20, #24 hoist rings are also available.How to Select Hoist Rings

 

Metric designations for hoist rings include:

 

  • M6
  • M8
  • M10
  • M12
  • M14
  • M16
  • M18
  • M20
  • M22
  • M24
  • M25
  • M26
  • M27
  • M28
  • M30
  • M32
  • M33
  • M35
  • M36
  • M38
  • M40
  • M42
  • M48
  • M56
  • M54

As a rule, the numbers which follow the letter “M” indicate the number of millimeters in diameter. For example, an M6 hoist ring is 6 mm in diameter. 

 

Standards

MS 15366 - Rings, connecting, round, hoisting sling, marine hardware

 

References

 

Image Credit:

 

Te-Co, Inc.