Blocks & Lowering Devices

Spring Lock Aluminum Blocks

Spring Lock Aluminum Blocks

Spring Lock Aluminum Blocks from ISC. These blocks are made from high tech aluminum alloy so they are incredibly light, but strong. Aluminum alloy bushings and sheaves are supported by stainless steel axles and bronze bearings. Bushings are easily accessed by quick-twist nob, and are captive, so they can't get lost. Cheek plates are broad enough to protect lines during use. Blocks are rated to 100 kN (working load limit of 4,800 lbs.) and weigh approximately 3.5 lbs. Sheave diameters are 2-3/4".
Description Item #
5/8" Aluminum Spring Lock Block (Blue, 4,800 lbs. Working Load Limit) RP 054A
3/4" Aluminum Spring Lock Block (Yellow, 4,800 lbs. Working Load Limit) RP 055A

Stainless Steel Blocks

Stainless Steel Blocks

Stainless Steel Blocks from CMI come with a 2-3/4" sheave and stainless steel bolt to maximize sling strength while the wide sideplates protect the rope from contact with rough bark. The upper bushings have a knurled knob and are captive so they can't get lost. Stainless steel and aluminum for durability in outdoor conditions. The RP130 handles rope up to 5/8", working load limit of 5,600 lbs., weighs 2.3 lbs. The RP131 handles rope up to 3/4", working load limit of 8,000 lbs., weighs 5.6 lbs.
Description Item #
5/8" Stainless Steel Block (5,600 lbs. Working Load Limit) RP130
3/4" Stainless Steel Block (8,000 lbs. Working Load Limit) RP131

Eye Slings

Eye Slings

Eye Slings are a popular tool for securing rigging hardware up in trees. We offer two styles of sling materials: Samson 3/4" Tenex, is a strong, loosely woven, flexible rope with no core and tensile of 22,000 lbs. (working load limit of 4,400 lbs.) and Samson 3/4" Stable Braid which is a common braided bull rope with a tensile of 19,000 lbs. (working load limit of 3,800 lbs.).
Description Item #
3/4" x 16' Tenex Sling (Blue) TNX 3416
3/4" x 14' Stable Braid Sling (Orange) SB 3414

Figure 8 Descender

Figure 8 Descender

The Figure 8 Descender is a commonly used friction device. When used properly, it will slow the rate of descent of an object, using varying degrees of tension. Made of aluminum, has a tensile of 35kN (7,700 lbs). NOTE: Gloves should always be worn when using these devices.
Description Item #
Figure 8 Descender F650

Rescue 8 Descender

Rescue 8 Descender

This Rescue 8 Descender is very popular because the ears keep rope from binding (hitching). Made of aluminum and has a tensile of 45kN (9,900 lbs). NOTE: Gloves should always be worn when using these devices.
Description Item #
Rescue 8 Descender 21366