140pc Stainless Steel Feather Key Set – Drive Shaft Keys 3–6mm

JARBLUE 140-Piece Round Ended Feather Key Assortment

Keep your mechanical projects running smoothly with this comprehensive 140-piece set of round ended feather keys (parallel drive shaft keys) from JARBLUE. Crafted from high-grade stainless steel and CE-certified, these keys are precision-engineered to secure gears, pulleys, sprockets, and other rotating components firmly to drive shafts. With 16 size variants all packed into one organized box, this assortment is a must-have for machinists, engineers, hobbyists, and anyone working with mechanical assemblies.

Made in Mainland China.

Key Features

• 140-Piece Assortment: 16 different size combinations — 3mm, 4mm, 5mm, and 6mm cross-sections with lengths from 8mm to 30mm — covering the most commonly used drive shaft key dimensions.
• Stainless Steel Construction: Corrosion-resistant and durable, built to withstand demanding mechanical environments.
• CE Certified: Meets CE standards for quality and safety in metalworking applications.
• Round Ended (Woodruff-Style) Design: Rounded ends ensure easy insertion and a secure, rattle-free fit in keyways.
• Organized Storage Box: All 140 keys arrive in a clearly labelled box, keeping every size within easy reach on the workbench.
• Wide Compatibility: Suitable for CNC machinery, motors, gear assemblies, RC vehicles, lathes, and general metalworking projects.

Complete Contents (140pcs)

Specifications

• Brand: JARBLUE
• Material: Stainless Steel
• Certification: CE
• Total Pieces: 140
• Application: Metalworking, CNC, motors, gearboxes, lathes, mechanical assemblies
• High-Concern Chemicals: None
• Origin: Mainland China
• Package: 1× Organized box containing all 140 keys

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Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What are round ended feather keys used for in mechanical applications?

A: Round ended feather keys (also called parallel drive shaft keys) are precision fasteners used to secure rotating components — such as gears, pulleys, flywheels, and sprockets — firmly onto a drive shaft. The rounded ends allow smooth insertion into keyway slots while preventing relative rotation between the shaft and the component, ensuring efficient torque transmission in machinery, motors, lathes, and CNC equipment.

Q: What sizes are included in this 140-piece feather key set?

A: This JARBLUE assortment includes 16 size variants with cross-sections of 3mm, 4mm, 5mm, and 6mm, and lengths ranging from 8mm up to 30mm. Specific sizes include 3×3×8mm, 3×3×10mm, 3×3×12mm, 3×3×16mm, 4×4×10mm, 4×4×12mm, 4×4×16mm, 4×4×20mm, 5×5×12mm, 5×5×16mm, 5×5×20mm, 5×5×25mm, 6×6×16mm, 6×6×20mm, 6×6×25mm, and 6×6×30mm — making it ideal for a wide range of metalworking and mechanical assembly tasks.

Q: Are these feather keys suitable for both professional and DIY metalworking projects?

A: Yes. The CE-certified stainless steel construction makes these keys reliable for both professional machinists and DIY enthusiasts. They are compatible with standard keyway specifications found in hobby RC vehicles, home workshop lathes, small CNC machines, and industrial motor assemblies alike.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.