Product Terminology

Blocks | Sheaves | Bearings / Bushings | Other

Blocks

Also known as pulleys, blocks are tools designed to move or change the direction of an item or load; generally featuring an Eye or Hook support. This product is made from steel-zinc electroplated finish.

BOLT BLOCK
A threaded fastner is substituted for an eye or hook. This product allows the user to mount to a female fastner or use a threaded nut to secure it.
DECK BLOCK
This product allows the user to mount the item horizontally or vertically.
FLAT MOUNT BLOCK
This is a block that can be mounted vertically or horizontally using the customer's choice of fastners.
GABLE BLOCK
This is a "Fixed Eye Block" that uses stamped parts. This block does not swivel; it has a fixed mounted eye at the top of the block.

Sheaves

A machined grooved wheel made from cold drawn bar stock-zinc electroplated finish. The groove diameter of the sheave is equal to the maximum cable size.

MULTIPLE SHEAVE
This is a product that allows multiple wire lines to be applied to the block or pulley.
SHEAVE BORE OR INSIDE DIAMETER (I.D.)
This is the hole dimension through a sheave that a shaft or bolt is mounted.
SHEAVES OUTSIDE DIAMETER (O.D.)
This is the diameter of the sheave.

Bearings/Bushings

This product is pressed into the center of a sheave. It is made from a powdered metal process and then oil impregnated for self lubrication. When applied to sheaves, these products increase the median load application.

Other

SIDEPLATES
This is the outer covering of a pulley. This part is stamped from low carbon coiled steel-zinc electroplate.
FORGINGS
Eyes & Hooks are produced using the drop forge technique. This method ensures optimum strength. Our forgings are also zinc electroplated.
FASTNERS
Rivets & Clevises are formed from low maleable steel wire.
HOOK-EYE SUPPORT
This part allows the eye of the hook to swivel in an assembled block or pulley.
SPACERS
Spacers are used to reduce the I.D. (inside diameter) of a sheave according the customer's needs.
STRESS FORMULA
This formula determines the stress generated in pounds on the block.
(L x A = S) Load in pounds (L) multiplied by the Angle of pull (A) equals Stress on the block (S).
SAFE WORK LOAD LIMIT
This is the maximum load (in lbs.) which can be applied to the block and which has been established by Block Division, INC. (Load Capacity)