The IMS “Big Bang” (BB) B70 Series is a precision-engineered filter basket designed for standard 58mm commercial portafilters. This competition-grade basket features a unique hole distribution pattern that increases the distance between holes from the center to the edge.

This innovative spacing forces water to flow more through the center of the puck, correcting the common tendency for side-channeling and promoting a sweeter, more even extraction.

Compatibility

These baskets feature a standard 70mm border (B70) and fit most 58mm commercial groups, including:

• E61 Group Machines: Rocket, ECM, Profitec, Lelit, Faema, Expobar, etc.
• Other Commercial Groups: La Marzocco, Slayer, Synesso, Nuova Simonelli, Victoria Arduino, Rancilio.
• Tamper Size: 58mm-58.5mm (Precision 58.5mm tampers recommended)

Available Sizes & Capacities

Select the height based on your preferred dose. Note: Capacity ranges are estimates for Light / Medium / Dark roasts respectively.

• B702TFH21.5BB (21.5mm): 14g -18g (Standard Double)
• B702TFH23.5BB (23.5mm): 17g – 21g (Large Double)
• B702TFH25.5BB (25.5mm): 20g – 24g (Triple / High Dose)
• B702TFH27.5BB (27.5mm): 22g – 26g (Extra High Dose)

Technical Specifications

• Material: AISI 304 Stainless Steel (Food Safe)
• Border Diameter: 70mm (B70 Standard)
• Body Diameter: 60mm
• Hole Pattern: “Big Bang” (Variable spacing)
• Hole Shape: Conical cross-section (Electropolished)
• Configuration: Ridgeless (Typically requires a tighter portafilter spring)

Key Features

“Big Bang” Distribution
The holes are packed tighter in the center and spread further apart toward the edges. This design counteracts the “edge-channeling” effect often seen in flat extractions, directing the flow through the sweet spot of the coffee puck.

Electropolished Finish
The stainless steel surface is electropolished to remove microscopic roughness. This ensures the basket is easy to clean, highly resistant to corrosion, and allows the spent coffee puck to knock out cleanly.