{"id":511,"date":"2012-04-01T20:43:59","date_gmt":"2012-04-01T20:43:59","guid":{"rendered":"http:\/\/wirerope.net\/2015\/2012\/04\/01\/double-pulleys\/"},"modified":"2022-06-16T21:50:01","modified_gmt":"2022-06-16T21:50:01","slug":"double-sheave","status":"publish","type":"post","link":"https:\/\/wirerope.net\/azwr\/double-sheave\/","title":{"rendered":"Double Sheave & Triple Sheave"},"content":{"rendered":"

DOUBLE SHEAVE<\/h2>\n

Strongest aluminum double sheave snatch-block type pulleys available. Designed for ropes up to 5\/8\u201d\u00a0diameter. Ultra-lightweight sheave fitted with Oilite\u00ae\u00a0<\/span>bushing, or sealed bearing and rotating high\u00a0strength alloy aluminum sideplates. Triangular rigging hole accepts up to three 13mm carabiners.<\/p>\n<\/div>

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\"double<\/span><\/div>
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2\u2033 DOUBLE SHEAVE WITH BECKET<\/h3>\n

This compact double sheave pulley was developed for 7\/16\u2033 to 1\/2\u2033 diameter ropes. Round rigging hole accepts two carabiners.<\/p>\n

Strength:<\/strong>\u00a08,100 lbf.
\nRWL:<\/strong>\u00a0810 lbs.
\nDimensions:<\/strong>\u00a06.5\u2033 x 2.25\u2033
\nPitch Diam:<\/strong>\u00a01.9\u2033
\nWeight:<\/strong>\u00a014 oz.
\nColor:<\/strong>\u00a0Red
\nRating:<\/strong>\u00a0General Use.<\/p>\n

610022<\/strong>\u00a0\u2013 2\u2033 Double, Oilite\u00ae Bushing
\n610022B<\/strong>\u00a0\u2013 2\u2033 Double, Sealed Bearing<\/p>\n

Exceeds NFPA 1983, 1985 Edition ANSI\/OSHA strength specifications.<\/p>\n<\/div>

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\"double<\/span><\/div>
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3\u2033 DOUBLE SHEAVE<\/h3>\n

Identical in design and specifications to the 3\u2033 Double Sheave Pulley with becket but WITHOUT the becket rigging point. Accepts ropes up to 5\/8\u2033 diameter.<\/p>\n

Strength:<\/strong>\u00a012,000 lbf.
\nRWL:<\/strong>\u00a0\u00a01,200 lbs.
\nDimensions:\u00a0<\/strong>8\u2033 x 3\u2033 x 3.5\u2033
\nPitch Diam:\u00a0<\/strong>2.3\u2033
\nWeight:\u00a0<\/strong>24 oz.
\nColor:<\/strong>\u00a0\u00a0Red
\nRating:<\/strong>\u00a0General Use.<\/p>\n

610023<\/strong>\u00a0\u2013 3\u2033 Double, Oilite\u00ae Bushing
\n610023B<\/strong>\u00a0\u2013 3\u2033 Double, Sealed Bearing<\/p>\n

Exceeds NFPA 1983, 1985 Edition ANSI\/OSHA strength specifications.<\/p>\n<\/div>

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\"3<\/span><\/div>
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3\u2033 DOUBLE SHEAVE WITH BECKET<\/h3>\n

Features two 2.75\u2033 diameter x 7\/8\u2033 wide sheaves separated by a high strength alloy aluminum plate with rigging becket and mounted on Oilite\u00ae bushing or sealed ball bearing. Main rigging point is constructed to accommodate three rescue carabiners. Another larger hole in the mid-section of the sideplates allows the unit to be used with the RSI Big Hook Carabiner. Accepts ropes up to 5\/8\u2033 diameter.<\/p>\n

Strength:<\/strong>\u00a012,000 lbf.
\nRWL:<\/strong>\u00a01,200 lbs.
\nDimensions:<\/strong>\u00a010\u2033 x 3\u2033 x 3.5\u2033
\nPitch Diam:<\/strong>\u00a02.3\u2033
\nWeight:<\/strong>\u00a024 oz.
\nColor:<\/strong>\u00a0Red
\nRating:<\/strong>\u00a0General Use.<\/p>\n

610025<\/strong>\u00a0\u2013 3\u2033 Double w\/ Becket, Bushing
\n610025B<\/strong>\u00a0\u2013 3\u2033 Double w\/ Becket, Bearing<\/p>\n

Exceeds NFPA 1983, 1985 Edition ANSI\/OSHA strength specifications.<\/p>\n<\/div>

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\"Stainless<\/span><\/div><\/div>
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RP125 4″ DOUBLE SHEAVE<\/h3>\n

Stainless steel pulley sideplates, two 4\u2033 aluminum sheaves, needle bearing, and stainless steel axle.<\/p>\n<\/div>\n\n\n\n\n
Model<\/span><\/td>\nMBS<\/span><\/td>\nRope Capacity<\/span><\/td>\nSize<\/span><\/td>\nWeight<\/span><\/td>\n<\/tr>\n
RP125<\/td>\n25,000lbs<\/td>\n5\/8″<\/td>\n9″ x 4.75″<\/td>\n4lb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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TRIPLE SHEAVE<\/h2>\n<\/div>
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\"triple<\/span><\/div>
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4\u2033 TRIPLE SHEAVE WITH ROTATING SIDEPLATES<\/h3>\n

The only triple sheave pulley with rotating sideplates. Designed for 7\/16\u2033 \u2013 5\/8\u2033 ropes. Can be reaved at any point on the line. 5:1 triple over double block and tackle system possible when used in conjunction with Double Sheave Pulley with becket. High strength alloy aluminum construction with Oilite\u00ae Bushing or Sealed Bearing. Triple carabiner rigging point.<\/p>\n

Tensile Strength:<\/strong>\u00a015,000 lbf.
\nRWL:<\/strong>\u00a01,500 lbs.
\nDimensions:<\/strong>\u00a010\u2033 x 4\u2033 x 4.5\u2033
\nPitch Diameter:<\/strong>\u00a03.5\u2033
\nWeight:<\/strong>\u00a070 oz.
\nColor:<\/strong>\u00a0Gold
\nRating:<\/strong>\u00a0General Use<\/p>\n

610034<\/strong>\u00a0\u2013 4\u2033 Triple, Oilite\u00ae Bushing
\n610034B<\/strong>\u00a0\u2013 4\u2033 Triple, Sealed Bearing<\/p>\n

Exceeds NFPA 1983, 1985 Edition ANSI\/OSHA strength specifications.<\/p>\n<\/div>

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\"Stainless<\/span><\/div><\/div>
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RP135 4″ TRIPLE SHEAVE<\/h3>\n

Stainless steel pulley sideplates, three 4\u2033 aluminum sheaves, needle bearing, and zinc-plated steel axle.<\/p>\n<\/div>\n

\n\n\n\n\n
Model<\/span><\/td>\nMBS<\/span><\/td>\nRope Capacity<\/span><\/td>\nSize<\/span><\/td>\nWeight<\/span><\/td>\n<\/tr>\n
RP135<\/td>\n30,000lbs<\/td>\n5\/8″<\/td>\n8″ x 4.75″<\/td>\n5.25lb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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BEARING vs. BUSHING<\/h2>\n

In rescue loads, the friction difference between bushings and bearings is minimal. It is only with loads that are greater than 5,000 lbs. that you begin to see the difference in friction. Ball bearings can dent the bearing race (brinelling). Sealed bearings can become contaminated with grit and seize. Oil Impregnated bronze bushings are stronger because there is a constant interface between the shaft, bushing, and pulley sheave. The bronze bushing is made from a soft material that will conform to the contaminant. Additionally, pulleys with bushings can be taken apart and cleaned.<\/p>\n<\/div>

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