IRONHIT Brush Cutter Blade Kit — 9" 20T, 9" 36T & 10" 80T Carbide-Tipped Blades with 1" Arbor Adapters, Heavy-Duty Manganese Steel

IRONHIT brush cutter blades are heavy-duty, carbide-tipped and manganese-steel replacement blades designed to fit straight-shaft trimmers with a 1-inch (25.4 mm) arbor, supplied as three blade options plus adapter kits for installation.

These replacement blades give homeowners and landscapers several tooth-count options — 9" 20T, 9" 36T, and 10" 80T — so you can choose the balance of speed and torque you need for brush, weeds, small trees and dense undergrowth. Each blade has a 1" center hole and is built from impact-resistant manganese steel with carbide tips on select models for longer edge life. The package includes two different adapter kits and basic tools so most straight-shaft trimmers with a 1" arbor can be fitted quickly.

What are the differences between the 9" 20T, 9" 36T and 10" 80T blades?

Each tooth count affects cutting behavior: fewer, larger teeth clear thicker material faster; more teeth provide a smoother cut and can handle finer vegetation. The 10" 80T is intended for more aggressive cutting of dense brush, while the 9" options offer a mix of control and speed for varied tasks.

• 9" x 20T — wider tooth spacing, faster tear-out on thicker stems and light saplings.
• 9" x 36T — mid-range tooth count for mixed brush and heavier weeds.
• 10" x 80T — high tooth density and carbide tips for dense thickets and long-lasting edges.

How do I know these blades will fit my trimmer or brush cutter?

These blades are manufactured for straight-shaft trimmers and cutters that accept a 1" (25.4 mm) arbor hole. They will not fit gearboxes or machines with smaller or proprietary arbors. Always measure your arbor diameter and confirm your model compatibility before purchase.

• Center hole: precisely 1" (25.4 mm) for straight-shaft compatibility.
• Not compatible: ECHO SRM series, many RYOBI/DEWALT consumer trimmers with different fittings.
• Check your machine manual or measure arbor with calipers to be certain.

What is included in the adapter kits and how hard is installation?

The set includes two distinct adapter kits to suit common mounting arrangements plus simple hand tools for assembly. Installation is straightforward for anyone comfortable with basic weed-eater maintenance, but follow the included video and safety guidance to ensure secure mounting and correct torque.

• First kit: thrust plate guard washer, thrust washer, rider plate, lock nut and washers.
• Second kit: thrust washer, rider plate, two collar nuts of different sizes, screwdriver, L- and T-wrenches, and washers.
• Watch the setup video for step-by-step fitting and torque sequence recommendations.

What safety precautions should I follow when using these blades?

These are metal blades meant to cut woody material and can cause serious injury if misused. Wear sturdy protective gear, keep bystanders clear, and inspect mounting hardware before each use. Do not use on machines with incompatible arbors or handheld units not designed for metal cutting blades.

• Wear boots (preferably ankle-high), heavy jeans, eye and hearing protection, and gloves.
• Ensure all adapter components are tightened and the blade is seated correctly.
• Do not use on machines explicitly listed as incompatible (ECHO SRM series, RYOBI, DEWALT models as noted).

Who this is for: Landscapers, property owners and rural homeowners who need durable metal cutting blades for clearing brush, small trees and heavy weeds on straight-shaft trimmers with a 1" arbor. Choose the tooth count that matches your typical vegetation: lower tooth counts for thicker stalks and higher counts for dense, fibrous brush. If you are unsure about compatibility or experience installing blades, consult a technician or follow the supplied video closely.