Yoke 542 Series Forged Snatch Block with Hook - 12 or 15 tonnes

Features

• YOKE Forged Snatch Blocks are manufactured of the highest quality forged alloy steel.
• Available from 12 tonnes to 15 tonnes, for wire rope sizes 19mm to 22mm.
• Part number, wire rope size and working load limit are marked on each block.
• Permanent batch codes link to test certificates for easy
• Supplied with bronze bushings and pressure lube fittings.
• Meets or exceeds all requirements of ASME B30.26.
• Safety factor 4:1
• Fatigue rated
• Supplied with a Certificate of Conformity
• Factory fitted with an RFID chip for serial and certificate traceability.
• Sheave groove bottom is hardened to 35 Rc to maximise durability.
• Closed die forged steel sheave

Specifications

*Minimum Ultimate Load is 4 times the Working Load Limit.

Dimensions

Item No.	B (mm)	E (mm)	F (mm)	G (mm)	L (mm)	R (mm)	T (mm)
8-542-12	60	140	67	166	565	498	50
8-542-15	60	140	67	220	614	547	50
8-542-1510	60	140	67	280	739	672	50

Loads on Blocks

Angle Factor Multipliers

The Working Load Limit (WLL) for Yoke Group blocks indicates the maximum load that should be exerted on the block and its connecting fitting. This total load value may be different from the weight being lifted or pulled by a hoisting system. It is necessary to determine the total load being imposed on each block in the system to properly determine the rated capacity block to be used. A single sheave block used to change load line direction can be subjected to total loads greatly different from the weight being lifted or pulled. The total load value varies with the angle between the incoming and departing lines to the block.

The following chart indicates the factor to be multiplied by the line pull to obtain the total load on the block.

Sheave Size and Wire Rope Strength

Strength Efficiency

Bending wire rope reduces its strength. To account for the effect of bend radius on wire rope strength when selecting a sheave, use the table above.