Crosby M-491/G-491 blocks deliver fail-safe reliability and fast line speeds for demanding tower and derrick applications.
Crosby Tower & Derrick Hoist Blocks are high-dependability lifting solutions engineered specifically for the rigorous demands of tugger hoist and tower erection applications. Constructed with a fully recessed sideplate design, these blocks eliminate the gap between the sheave rim and sideplate, providing a failsafe capture of the sheave even in the event of center pin overloading.
The core features sealed tapered roller bearings, which extend the life of the center pin and allow for faster line speeds compared to standard snatch blocks. All load-bearing components, including the forged steel swivels, tees, yokes, and shackles, are Quenched and tempered for maximum durability and impact resistance.
Standards Complied:
API RP54 (Tugger/Derrick applications)
OSHA Directive CPL 2-1.36 (Tower applications)
ABS Type Approval (2019 Guide for Certification of Lifting Appliances)
The fully recessed sideplate design prevents the sheave from slipping, ensuring safety even during center pin overloading.
Sealed tapered roller bearings allow for significantly faster line speeds than standard snatch blocks.
Side plates are equipped with through-holes designed for secondary block securement devices.
All forged steel components (swivels, tees, yokes) are Quenched & Tempered to withstand harsh environments.
Features convenient lubrication access through the center pin for easy servicing.
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