BEARINGS

Which is better - a pulley with bushings or a pulley with sealed bearings? A pulley whose sheave turns on sealed ball bearings is usually more efficient than a pulley incorporating bushings. Output of a system using ball bearing pulleys is significantly higher than systems using all bushing pulleys and the same input forces.

Sealed bearing pulleys tend to be slightly more expensive, and are sealed closed to prevent contamination. While efficient, under extraordinary loads sealed bearings can be prone to damage. Pulleys with bushings tend to be less expensive and more durable than sealed bearing pulleys under heavy loads. In short; pulleys with bearings are higher maintenance. The best pulley for you depends on your specific application.

SMC 3” PRUSIK MINDING PULLEY

The unique shape of SMC’s aluminum side plates allow the efficient use of Prusik hitches as a belay or progress capture device. Constructed with a 3” diameter sheave running on a high efficiency ball bearing. Low profile fasteners help eliminate the possibility of the pulley snagging.

Key Features:

Ball bearing . Large top hole easily accepts 3 large carabiners . Designed for 11mm to 13 mm ropes . Precision machined aluminum side plates and sheaves . Sealed bearings . Double pulleys include a becket

Single

Tread 2.5”

SM158000N Double

SM158500N 2.5”

Sheave Weight 3”

$80.40 3”

$119.35

SMC 2” PRUSIK MINDING PULLEY

This mid sized PMP is the perfect choice for rigging with 11 mm (7/16”) rope or when you don’t have room for a 3” PMP. Pulley will accommodate up to 13 mm rope.

Key Features:

Precision machined aluminum side plates and sheaves . Sealed Bearings . Double pulleys include a becket . Also available in all Black

Single

Tread Weight 1.5”

SM152700N $58.20 Double

1.5” SM152800N $91.00

SMC MICRO PRUSIK MINDING PULLEY

Just the thing for smaller ropes and lighter loads, SMC’s Micro PMP’s are ideal for building a mini haul rig or anywhere that a compact lightweight system is needed. Double version is designed with a becket to accommodate compound and complex pulley systems. Max rope diameter 12.5 mm

Key Features:

Ball bearing . Precision machined aluminum side plates and sheaves . Sealed Bear- ings . Double pulleys include a becket . Also available in all Black

Single

Tread Weight 1”

SM153000N $38.65 Double

1” 16 SM154000N $76.50 MBS 3.5 oz (99 g) 5.8 oz (164 g) 22 kN (4,946 lbf) 47 kN (10,566 lbf)

CERTIFIED NFPA 1983, L

MBS 6.3 oz (179 g) 10.4 oz (295 g) 38 kN (8542 lbf) 54 kN (12,140 lbf)

CERTIFIED NFPA 1983, G

MBS 12.5 oz (354 g) 20 oz (590 g) 38 kN (8,542 lbf) 60 kN (13,488 lbf)

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