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303

McKissick

Blocks

Construction and Crane Blocks

Some of the most important considerations in your block requirements are:

AVAILABLE BEARING TYPESr Bronze BushedS.A.E. 660 bronze with gure 8 oil groove (See Fig. B-1).r Double row sealed tapered roller bearing (See Fig. T-1).r Straight roller bearing (See Fig. R-1).r Full Complement Cylindrical Roller bearing (See Fig. F-1).

Fig. R-1Fig. B-1 Fig. F-1Fig. T-1

THE SHEAVENote the groove form with proper line support and gently rounded lips to prevent line chang when !eet angles etc. are present.

Note the groove is completely machined to proper line size.

Note the dense martensitic structure clearly outlined by the etch. This !ame hardened surface in the wear area of the sheave always presents a smooth, uncorrugated, proper size groove face to the line. Sheaves 14 (356mm) di-ameter and over are !ame hardened in groove to minimum 35 Rockwell C. Smaller sheaves can be !ame hardened on special order.

Unretouched photograph of a section cut from a !ame hardened McKissick sheave (etched 2-1/2 Minutes) (NH4)2S408).

ADDITIONAL CONNECTIONS

ALL CRANE AND CONSTRUCTION BLOCKS CAN BE FURNISHED WITH:

Swivel shackle, in selectedcapacities, with bronze thrust or roller thrust bearing.

Single hook in capacities to 300 tonnes (See page 469).

Duplex swivel hook in standard capacities to 1,000 tonnes. Larger sizes available(See page 465).

Quad swivel hook from 200 tonnes and larger.