Black & Decker 90559117 Line Cutting Blade – Genuine OEM Replacement String Trimmer Line Cutter Blade

Part Number: 90559117
Category: Outdoor Power Equipment Parts → String Trimmer Parts → Line Cutting Blades
Type: Black & Decker 90559117 Line Cutting Blade – Genuine OEM Replacement String Trimmer Line Cutter Blade

The Black & Decker 90559117 Line Cutting Blade is a genuine OEM replacement line cutter blade designed for compatible Black & Decker and Craftsman string trimmers. Mounted to the trimmer guard, this hardened steel blade automatically trims excess trimmer line to the correct operating length as new line advances. Manufactured to original equipment specifications, it provides a direct-fit replacement for worn, dull, bent, or damaged line cutter blades, helping maintain proper cutting diameter, efficient trimming performance, and reduced line waste.

Key Features & Benefits

• Part Number: 90559117
• Genuine OEM Black & Decker replacement part
• Replacement line cutting blade for string trimmers
• Automatically trims excess cutting line
• Helps maintain the correct cutting swath
• Reduces unnecessary line waste
• Hardened steel construction for durability
• Direct-fit OEM replacement
• Manufactured to original equipment specifications

Technical Specifications

Part Number: 90559117

Manufacturer: Black & Decker

Product Type: Line Cutting Blade

Material: Hardened Steel

Mounting Location: Trimmer Guard

OEM Part: Yes

Quantity: Sold Individually

Note: Mounting screw is sold separately.

Compatible Applications

The Black & Decker 90559117 Line Cutting Blade fits numerous compatible string trimmers, including:

Black & Decker

• 98020SE (Type 1)
• LST136 (Type 1)
• LST136 (Type 2)
• LST136B (Type 2)
• ST8600 (Type 1)

Craftsman

• 90098020 Trimmer/Edger
• CMCST98020 Series String Trimmers

Always verify your trimmer model, type number, and original part number before ordering to ensure proper compatibility.

Function of the Line Cutting Blade

The 90559117 Line Cutting Blade is an important component of the trimmer guard assembly. It helps to:

• Trim excess trimmer line to the correct operating length
• Maintain the designed cutting diameter
• Improve cutting efficiency
• Prevent excessive line consumption
• Support smooth automatic line feed operation
• Restore the trimmer's original cutting performance

Using a genuine OEM replacement blade helps ensure consistent line length and dependable trimming results.

Common Signs Replacement Is Needed

Replace the line cutting blade if you notice:

• Dull or rounded cutting edge
• Bent or damaged blade
• Excessively long trimmer line after feeding
• Increased line consumption
• Poor trimming performance
• Missing line cutter blade

A worn or damaged line cutting blade can allow excess line to extend beyond the intended cutting diameter, reducing efficiency and increasing strain on the trimmer.

Installation & Service Notes

Disconnect the trimmer from the power source or remove the battery before performing maintenance.

Remove the mounting screw securing the existing 90559117 Line Cutting Blade to the trimmer guard. Remove the worn blade, clean the mounting surface, and inspect the guard for damage. Position the replacement blade in the original orientation and secure it using the original mounting screw or a replacement screw if necessary. Verify that the blade is firmly attached before returning the trimmer to service. Installation typically requires only a screwdriver and can be completed in just a few minutes.

Important: Always verify your trimmer model and original part number before ordering. Wear gloves when handling the blade, as the cutting edge is sharp. Inspect the trimmer guard during replacement and replace any damaged guard components to ensure safe operation.

Maintenance Recommendations

• Inspect the line cutting blade regularly for wear or damage.
• Remove grass buildup from the trimmer guard after each use.
• Replace dull or bent blades promptly to maintain proper line length.
• Check that the mounting screw remains secure during routine maintenance.
• Keep the guard clean to ensure proper automatic line trimming.
• Use genuine OEM replacement parts to maintain factory fit, safe operation, and long-term string trimmer performance.