USA-Made Cradle Compounding Kit – Aluminum Sheaves & 316 Stainless Hardware 4" × 3/4" Sheaves with 3/4"-10 × 3-1/2" Axle Bolts for Compound Boat Lift Systems Convert your boat lift from a straight-line setup to a compound cable system with our Cradle Compounding Kit featuring aluminum sheaves and A4 / 316 stainless steel hardware. Each kit includes four 4" diameter × 3/4" wide aluminum sheaves manufactured in the United States with SAE 841 oil-impregnated sintered bronze bushings (Oilite®), plus matching 3/4"-10 × 3-1/2" axle bolts precision-machined in the USA with built-in zerk grease fittings. The included axle bolts, lock washers, and hex nuts are A4 / 316 marine-grade stainless steel for improved corrosion resistance in saltwater environments. Material Note: Sheaves are aluminum with bronze bushings. Included hardware (axle bolts, lock washers, and hex nuts) is A4 / 316 marine-grade stainless steel. Application Note: Designed for use in typical 8,000 lb-class four-sheave compound boat lift configurations.* Key Features Designed for 8K-Class Compound Systems: Intended for typical four-sheave compound lift layouts used on 8,000 lb-class systems.* USA-Made / USA-Machined Components: Sheaves are manufactured in the USA, and axle bolts are machined in the USA for precise fit and function. Complete Compounding Kit: Includes 4 sheaves, 4 axle bolts with built-in zerk fittings, 4 lock washers, and 4 hex nuts for a matched installation. 316 Stainless Hardware: Axle bolts, lock washers, and hex nuts are A4 / 316 stainless steel for strong corrosion resistance in marine environments. Built-In Zerk Grease Fittings: Helps simplify maintenance and extend service life without full teardown. SAE 841 Bronze Bushings: Oil-impregnated sintered bronze bushings help reduce friction and minimize sheave and cable wear. Product Description Upgrade Your Lift with a Matched Compound Kit: This kit is built for customers converting from a straight cable setup to a compound arrangement using properly matched sheaves and axle hardware. The U.S.-made aluminum sheaves help maintain consistent groove tolerances, while the U.S.-machined axle bolts provide a precise fit with integrated lubrication access. Marine-Grade Hardware Where It Matters: The included axle bolts, lock washers, and nuts are made from A4 / 316 stainless steel for improved resistance to rust, pitting, and corrosion in coastal and saltwater applications. Built-in zerk fittings make routine greasing faster and more convenient. Clear Material Separation: This kit combines aluminum sheaves for smooth cable handling with 316 stainless steel hardware for corrosion resistance and long-term marine durability. That combination gives lift owners the benefit of purpose-built sheaves and upgraded stainless support hardware in one package. Compatibility: Designed to fit most 3/4" pulley brackets and cradle beam applications commonly found in side-mount, overhead, and pile-mount boat lift systems, as well as other demanding industrial sheave applications. Specifications Intended Application: Typical 8,000 lb-class four-sheave compound lift systems* Sheaves (x4): Made in USA – 4" diameter × 3/4" wide, aluminum, SAE 841 oil-impregnated sintered bronze bushing (Oilite®) Cable Capacity: Up to 5/16" Axle Bolts (x4): 3/4"-10 × 3-1/2", machined in USA from imported 316 stainless blanks, built-in zerk fitting Lock Washers (x4): 316 stainless steel Hex Nuts (x4): 316 stainless steel Recommended Use: Boat lift compounding conversions, dock lift maintenance, and related marine sheave applications SAE 841 is a porous, oil-impregnated sintered bronze bearing material designed for long-life, low-maintenance rotation. Important: A compound system may reduce required line pull through mechanical advantage, but it does not automatically increase the rated capacity of the complete lift system. Final suitability depends on the full lift design, cable size and condition, bracket alignment, structure, installation quality, and maintenance. *Intended for use in typical four-sheave compound configurations on 8,000 lb-class lift systems. Actual suitability depends on overall lift design, boat weight, cable routing, cable condition and size, bracket alignment, installation quality, maintenance, and all related system components. Monster Bolts does not certify complete lift systems. Customers should verify application suitability with the lift manufacturer or a qualified marine lift professional before use. Kit assembled in Florida. Sheaves are U.S.-manufactured; axle bolts are machined in the USA from imported 316 stainless blanks; lock washers and nuts are globally sourced to Monster Bolts specifications. Why Choose This Kit? Built for Marine Service: Aluminum sheaves paired with 316 stainless hardware for saltwater-minded performance. Matched Components: Everything needed for a four-corner compound setup in one kit. Built-In Maintenance Access: Zerk fittings help keep the system lubricated and operating smoothly. Clear Material Transparency: No confusion—aluminum sheaves, bronze bushings, and 316 stainless hardware. Order Yours Today! Upgrade your lift with a purpose-built Cradle Compounding Kit featuring aluminum sheaves and 316 stainless steel hardware. Buy now for fast U.S. shipping and support from Monster Bolts. ✔️ USA-made sheaves ✔️ USA-machined axle bolts ✔️ 316 stainless hardware for marine environments Need assistance? Contact our support team | Shipping & Return Policy
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