GB1099 ￠2￠2.5￠3￠4 Carbon steel semicircular key crescent key moon key C-type latch semicircular key pin

Our Carbon Steel Semicircular Key (also known as Crescent Key, Moon Key) with C-Type Latch and Key Pin is a professional-grade mechanical fastener, manufactured in strict accordance with the GB1099 standard—designed specifically for shaft connection, locking, and positioning in industrial machinery and equipment. Crafted from high-quality carbon steel, these semicircular keys offer excellent hardness, wear resistance, and tensile strength, ensuring stable performance and long service life in high-load mechanical operations.

 

Featuring a semicircular (crescent/moon) design paired with a C-Type latch and key pin, the fasteners provide a tight, secure fit between shafts and gears, preventing slippage and ensuring precise power transmission. The standard GB1099 specification guarantees compatibility with most industrial machinery, making them a versatile choice for mechanical assembly, maintenance, and repair.

 

Available in four common sizes—￠2, ￠2.5, ￠3, and ￠4—these semicircular keys cater to diverse shaft connection needs, suitable for use in motors, gearboxes, pumps, and other mechanical equipment. The carbon steel construction ensures durability and reliability, even in harsh industrial environments, while the precision machining ensures a perfect fit, reducing wear and extending the service life of your machinery.

 

Ideal for industrial machinery assembly, shaft and gear locking, mechanical equipment maintenance, and engineering projects, these GB1099 carbon steel semicircular keys (crescent/moon keys) combine professional standard, durability, and practicality. They are also suitable for wholesale orders, serving the needs of manufacturers, mechanical workshops, and maintenance teams.