ISC Medium 3/4" Aluminum Spring Block
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ISC Medium 3/4" Aluminum Spring Block
The ISC medium arborist block is a great tree rigging block for professional use. This block is built for serious use with practical features that set it above other tree rigging blocks. The upper sheave is over-sized so that it can accept up to 1” tree rigging slings. The block is secured with a spring-lock. To open, the user simply pushes the pin in, twists, and the sideplates may be swung open. The upper bushing and pin are retained, so they can't fall out during use.
The block accepts rigging ropes of up to 3/4” diameter, and tree rigging slings up to 1”. The load rating on the block is 33,720 lb MBS (150 kN), with a WLL of 6,744 lb (30 kN) at a 5:1 design factor. The surfaces of this block are rounded to be more rope-friendly. The sheaves are larger than other 3/4” block for a better bend radius in your rigging lines.
This arborist block is recommended for professional use in medium to heavy tree rigging. The combination of good design and strength is unbeatable at this price.
Purchase this kit as a package with a 3/4” x 2’-8’ Loopie sling and save.
PUL303WesSpur offers free ground shipping for orders that meet the following criteria:
The free shipping offer covers UPS Ground. UPS Ground runs Monday-Friday. Stump Grinder teeth and Chipper Blades eligible for the free shipping offer are shipped via USPS Priority Mail, in Medium Flat Rate Boxes. UPS Ground requires a physical address for delivery (no P.O. boxes).
WesSpur is happy to offer returns or exchanges on any equipment that is still in new condition. Our return policy is fairly simple and is meant to make your life easy. All regular stock items in new/unused condition may be returned for a full refund less shipping within 30 days of purchase. We do not charge restocking fees.
WesSpur can not accept the return of any used equipment or special-order items.
See our full Returns and Warranty Policy on the help page
| Manufacturer | : | ISC |
| Made in | : | UK |
| MBS | : | 33,720 lb / 150 kN |
| WLL (5:1) / (10:1) | : | 6,744 lb / 3,372 lb |
| Max Rope Diameter | : | 3/4” |
| Max Sling Diameter | : | 1” |
| Sideplate Material | : | Powder-coated aluminum |
| Sheave Material | : | Aluminum |
| Axle Material | : | Stainless Steel |
| Upper Sheave Diameter | : | 2” |
| Lower Sheave Diameter | : | 3 1/2” |
| Height | : | 8.75” |
| Width | : | 4.75” |
| Weight | : | 4.77 lb |
Each ISC Medium 3/4” medium arborist block is individually serial-numbered.
The American National Standards Institute (ANSI) has released the ANSI Z133 safety requirements which apply to arboricultural operations. Components of a rigging system must be used within their Working Load Limits.
ISC blocks are ANSI compliant when used within the manufacturer Working Load Limits.
A green log weight chart (found in the Samson Rigging Wheel) will aid in determining loads in tree rigging.
The full ANSI Z133 safety requirements are available on our tree care standards page.
