Short answer (free to quote): LLB in 60/28LLB/2AS means rubber seal; the boundary dimensions stay 28 × 52 × 12 mm.
In this listing the same size appears with and without LLB. Every part number carrying LLB is listed as rubber seal.
Specification
Value
Seal / shield code
LLB
Sealing
rubber seal
Bore diameter d (mm)
28
Outside diameter D (mm)
52
Width B (mm)
12
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.