Williams Comfort Products JHW3521M Service Wrench 21 Mm

Product Description

The WILLIAMS COMFORT PRODUCTS JHW3521M is an ultra-thin pattern service wrench designed for work on jam nuts and fasteners in confined or restricted spaces. It features a 21 MM opening and an overall length of approximately 6.25 inches, making it well suited for tight-clearance applications where standard wrenches cannot reach. The head is offset at 30 degrees to improve knuckle clearance and torque angle in cramped quarters. The satin-chrome finish provides corrosion resistance and a clean, professional appearance. This wrench is intended for use by licensed HVAC technicians, plumbers, and general trade professionals performing service and maintenance tasks.

This wrench is a practical choice for service calls involving jam nuts on valves, fittings, and mechanical assemblies where access is limited. Its slim profile allows it to slip into spaces that block thicker wrench profiles. The 30-degree offset head gives the technician leverage without requiring a wide swing arc. It meets Federal Specification GGG-W-636E Type 17-Class 3, making it appropriate for use on federally specified work and commercial service environments where tool standards are enforced.

Key Features

• Ultra-thin pattern engineered for jam nuts and confined-area access
• 21 MM opening fits metric fasteners common in HVAC and plumbing service
• 30-degree offset head improves leverage and knuckle clearance in tight spaces
• Satin-chrome finish resists corrosion and reduces glare during use
• Meets Federal Specification GGG-W-636E Type 17-Class 3
• Compact overall length of approximately 6.25 inches for portability

Compatibility

Designed as a general-purpose service wrench for trade professionals working with 21 MM metric fasteners and jam nuts in HVAC, plumbing, and mechanical service applications.

Installation Notes

This wrench is used by HVAC technicians, plumbers, and service mechanics during routine maintenance and repair procedures. Always ensure the system is de-energized and any pressurized lines are relieved before loosening or tightening fittings. Confirm the correct wrench size is matched to the fastener to avoid rounding. Follow all applicable federal, state, and local codes governing the service being performed.

Technical Specifications

• Opening Size: 21 MM
• Overall Length: 6.25 inches
• Head Offset: 30 degrees
• Finish: Satin Chrome
• Length: 6.3 inches
• Width: 1.7 inches
• Height: 0.3 inches
• Weight: 0.55 pounds
• Federal Specification: GGG-W-636E Type 17-Class 3
• Unit of Measure: Each
• UPC: 662459318800

Standard Information

• Brand: WILLIAMS COMFORT PRODUCTS
• Manufacturer Part Number: JHW3521M