Husqvarna 581643666 Chainsaw Chain 16 in 325 050 66DL

Product Description

The HUSQVARNA 581643666 is an OEM replacement chainsaw chain designed for professional-grade cutting performance. Configured in the SP33G sequence, this chain features a 325-inch pitch, a 050-inch gauge, and 66 drive links fitted to a 16-inch bar. It is manufactured from steel and provides a precise fit for compatible Husqvarna chainsaw models. Licensed HVAC and general service trades, arborists, and outdoor power equipment technicians rely on OEM chains to maintain safe, consistent cutting performance. Replacing a worn chain with a factory-spec unit restores proper tension, reduces kickback risk, and preserves bar groove integrity.

This chain is suited for residential and light commercial cutting applications where bar length and chain pitch must match the original equipment specification. The 16-inch bar length and 325 pitch configuration are common in mid-range homeowner and prosumer-class chainsaws. Compatible models include the Husqvarna 435, 440, and 450 Rancher. Installing the correct OEM chain ensures the sprocket engagement and drive link profile remain within factory tolerances, which directly affects operator safety and cutting efficiency.

Key Features

• OEM part number 581643666 ensures exact fit for compatible Husqvarna models
• SP33G chain type engineered for efficient, low-vibration cutting
• 325-inch pitch and 050-inch gauge match original bar and sprocket specifications
• 66 drive links configured for 16-inch bar applications
• Steel construction for durability and resistance to wear during repeated use

Compatibility

Compatible with Husqvarna 435, 440, and 450 Rancher chainsaw models. Verify bar length, pitch, gauge, and drive link count against the existing chain before installation.

Installation Notes

Chain replacement should be performed by a qualified outdoor power equipment technician or a trained operator following the chainsaw manufacturer's service manual. Disengage the chain brake, remove the bar cover, and relieve all chain tension before removing the worn chain. Ensure the new chain is seated correctly in the bar groove and on the drive sprocket before tensioning to the manufacturer's specification. Always wear cut-resistant gloves when handling chainsaw chain.

Technical Specifications

• Chain Type: SP33G
• Bar Length: 16 inches
• Pitch: 325 inches
• Gauge: 050 inches
• Drive Links: 66
• Material: Steel

Standard Information

• Brand: HUSQVARNA
• Manufacturer Part Number: 581643666