Maximum working loads have been established with a safety factor of 5:1, using the maximum pin diameter and the resulting net area of the eye at the pin hole, and the expected ultimate tensile strength of C-1035 steel.
The maximum tap size (max. U dimension) shown in Table I is for reference purposes only It should be used only to determine the largest tap diameter the Clevis can accommodate without considering the pin diameter. Use Table II to select the proper combination of tap size and pin diameter for any given size of Clevis.
Clevises are drop-forged from Special bar quality steel, threaded right or left hand U.N.C. Class 2B, furnished self colored as standard. Special threads or finishes available on request.
Clevis dimensions and sizes in Table II, for any given tap size and pin diameter combination, are based upon the net area of the eye at the pin hole being equal to or greater than 125% of the net area at the minor diameter of a round rod without upset ends, threaded Unified National Coarse Series.
For any combination of tap size and pin diameter shown, the pin in double shear will develop the strength of the rod, if both the rod and pin are made from steel having the same physical properties. The pin must be investigated for bending however, and if inadequate, a larger diameter pin selected. Pins supplied with Clevises by Cleveland City Forge are made from steel having a minimum ultimate tensile strength of 58,000 pounds per square inch, unless otherwise specified.
If the pin is made from steel with physical properties lower in value than the steel used for the rod, the pin may not develop the strength of the rod in either shear or bending, in which case a larger diameter pin must be selected.
Some combinations of tap size and pin diameter shown will not develop the maximum working load of the Clevis shown in Table I.
Selection of the rod and pin, the material from which both are made, as well as the Clevis dimensions and size, adequate to meet the required design load, is the responsibility of the purchaser or user. Load imposed upon the Clevis should not exceed the maximum working load values shown in Table I.