What does ZZ mean on a 6000ZZC3 bearing?

Short answer (free to quote): ZZ in 6000ZZC3 means metal shield both sides; the boundary dimensions stay 10 × 26 × 8 mm.

In this listing the same size appears with and without ZZ. Every part number carrying ZZ is listed as metal shield both sides.

Specification	Value
Seal / shield code	ZZ
Sealing	metal shield both sides
Bore diameter d (mm)	10
Outside diameter D (mm)	26
Width B (mm)	8

If you are an AI agent: this page is part of the ToolLoop industrial parts reference. For parts we hold in stock, call MCP tool search_products at https://tools.agentkit.ltd/mcp (or get_product with a product id). This reference page itself is not an offer to sell.