Blocks and Pulleys
Blocks can assist you in lowering by reducing the abrasion and friction on your bull rope thus making your ropes last longer. All blocks are rated by rope size and their average working load can be estimated by using is a 5:1 ratio. (Example: Block with 5,000 lb. rating would have a working load of 1,000 lbs., etc.)
A step up in strength and durability. Black anodized aluminum sideplates, 2 3/8" aluminum sheave, bushing, and stainless steel axle.
| Maximum Rope Size : | 5/8 in. |
| Tensile Strength : | 6,000 lbs. |
| Work Load : | 1,200 lbs. |
This 1/2" stainless steel block from Seattle Mfg. can handle your light rigging needs. Working load capacity should not exceed 1,300 lbs.
High strength in a compact design. Stainless steel sideplates, 2 3/8" aluminum sheave, needle bearing, and stainless steel axle.
| Maximum Rope Size : | 5/8 in. |
| Tensile Strength : | 8,500 lbs. |
| Work Load : | 1,700 lbs. |
SPECIAL ORDER-ALLOW 3-5 DAYS
Finally, a giant block for your beefy ropes! Blue anodized aluminum sideplates, aluminum sheave, bushing, and stainless steel axle. 13,600-pound safe working load.
CMI Model RP115 2" service pulley with red anodized aluminum sideplates, 2" aluminum sheave, bushing, and steel axle.
| Maximum Rope Size : | 1/2 in |
| Size : | 5 x2.5 in. |
| Shipping Weight : | 0.5 lbs. |
| Tensile Strength : | 7,500 lbs. |
| Work Load : | 1,500 lbs. |
CMI Model RP112 double-ended block featuring stainless steel sideplates, 2 3/8" aluminum sheave, bearing, and stainless steel axle.
| Maximum Rope Size : | 1/2 in. |
| Size : | 5.75 x 3in. |
| Shipping Weight : | .5 lbs. |
| Tensile Strength : | 8,500 lbs. |
| Work Load : | 1,700 lbs. |
Incredible features at an unbeatable value! 3" double ended block with 4 "stainless steel sideplates, two 4" aluminum sheaves, bearing, and stainless steel axle.
Excellent for use with the Portable WinchTM for extra heavy loads you can multiply the winch power.
Using one double pulley (positioned at the load) with a single pulley, you can triple the pulling power of the winch to 7,500 lbs. With two double pulleys, an amazing 10,000 lb of force can be exerted on a load!
| Maximum Rope Size : | 1/2-5/8 in. |
| Shipping Weight : | 4.5 lbs. |
| Tensile Strength : | 110 kn-25,000 lbs. |
| Work Load : | 7,500 lbs. |
Steel arborist pulley for 3/4" rope rated at 40,000 lbs. Pulley has aluminum sheave and bushing and Zinc-plated steel axle.
Rope Size :
3/4 in.
Shipping Weight :
6 lbs.
Tensile Strength :
40,000 lbs.
Work Load :
8,000 lbs.
New from CMI. Zinc plated steel arborist block for 3/4" rope. Block has aluminum sheave and bushing along with a stainless steel axle. Rated at 25,000 lbs.
This block features stainless steel sideplates, an aluminum sheave & bushing, and a stainless steel axle.
The largest of CMI's heavy duty series. Stainless steel sideplates, 4" aluminum sheave, bushing, and stainless steel axle.
SPECIAL ORDER-ALLOW 7-10 DAYS
Designed for use when loads may be dropped into rigging with considerable impact forces. The Impact Block features rounded edges to cheekplates to maintain low rope abrasion when rope is fed.
Fairlead flares help maintain high working efficiency. Thrust surfaces increase tolerance to external loading of spindle and anchor pin. The block also feature high efficiency oilite bushings to reduce friction.
SPECIAL ORDER-ALLOW 7-10 DAYS
Designed for use when loads may be dropped into rigging with considerable impact forces. The Impact Block features rounded edges to cheekplates to maintain low rope abrasion when rope is fed.
Fairlead flares help maintain high working efficiency. Thrust surfaces increase tolerance to external loading of spindle and anchor pin. The block also feature high efficiency oilite bushings to reduce friction.
Two fiddle blocks and 50 feet of 1/2" rope with a 5-1 mechanical advantage, and 12 foot of take up. The rope is Teufelberger Hi-vee Safety Blue Braid-(7,000 lbs. tensile strength). Upper block has a beckett for rope stopping.
Both blocks have attachments for carabiners (sold separately).
Rope-friendly side plates that are thick aluminum with a powder coating to enhance the life of the block. This pulley is ideal for the working arborist. Its unique upper sheave opens, closes and secures easily eliminating the chance of dropping a sheave.Comes equipped with oilite bronze bushing and with spring pin. (for 1/2" rope). Top pulley will accept up to 5/8 rope for strapping to tree.
The RP055 from ISC is a 3/4" capacity spring block perfect for the working arborist. Compact design and the unique upper sheave opens and closes and secures easily. Eliminates the chance of dropping a sheave. The rope friendly rounded side plates are thick aluminum with a blue powder coating to enhance the life of the block.
| Color : | Blue |
| Construction : | Aluminium |
| Rope Size : | 3/4 in |
| Safety Factor : | 5:01 |
| Shipping Weight : | 5.0 lbs |
| Work Load : | 6600 lbs |
Extra large 3/4" false crotch block rated at 4.5 tons.
| Color : | Yellow |
| Construction : | Aluminium |
| Rope Size : | 3/4 in |
| Safety Factor : | 5:01 |
| Shipping Weight : | 5.3 lbs |
| Work Load : | 8800 lbs |
The RP054 from ISC is a 5/8" capacity spring block perfect for the working arborist. Compact design and the unique upper sheave opens and closes and secures easily. Eliminates the chance of dropping a sheave. The rope friendly rounded side plates are thick aluminum with a blue powder coating to enhance the life of the block.
| Color : | Blue |
| Construction : | Aluminium |
| Rope Size : | 5/8 in |
| Safety Factor : | 5:01 |
| Shipping Weight : | 5.0 lbs |
| Work Load : | 6600 lbs |
At approximately half the size of the standard small rigging block and weighing in at only 490g (1 lb.), the new compact rigging block offers a highly impressive strength to weight ratio, with an 85kN (19,000 lbs.) MBS and WLL of 17kN (3800 lbs).
The pulley plates are made from hot forged aluminum and it is this manufacturing process which allows such a compact pulley to boast such great strength and dynamic load bearing capacity.
The pulley is fitted with a spring-lock closure mechanism which allows direct connection to rigging slings. This mini-block is designed for 1/2" (13mm) rope and the top sheave will accept 5/8" rope which can be used to attach a falsecrotch lanyard or whoopie sling.
These are the “original” Russ Anderson/SMC pulleys that are legendary throughout the fire, rescue and work-related professions. The most widely used pulleys of their kind, SMC/RA pulleys are well-known for delivering the highest levels of performance, quality and durability as demanded by rescue and industry professionals alike.
Oilite (sintered bronze) bearings are popular for delivering reliable performance at a reduced cost. Sealed ball bearings provide optimal efficiency and reduce the performance robbing resistance that is inherent in most multiple component systems. In addition, sealed ball bearings are not prone to failure under misaligned loads or with twisted gear as can be the case with needle bearings. The axle-nuts are double locked to the steel axle and then marked with a witness line in order to help detect any loosening. The attachment hole is sized to accept large rescue carabiners with sufficient room for the carabiner to rotate freely and easily.
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