Short answer (free to quote): LLU in 6000LLUCM/5K means rubber seal; the boundary dimensions stay 10 × 26 × 8 mm.
In this listing the same size appears with and without LLU. Every part number carrying LLU is listed as rubber seal.
Specification
Value
Seal / shield code
LLU
Sealing
rubber seal
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.