# IMS B68 Competition 1 Cup H24.5 (B681TH24.5E)

> Espresso compatibility data from EspressoFit. Confidence: **manufacturer (Tier 1 — manufacturer primary source read firsthand)**.
> Sources last read firsthand: 2026-07-26.
> Canonical page: https://espressofit.com/baskets/ims-b68-competition-1-cup/

## Specifications

- **Diameter:** 58 mm
- **Depth:** 24.5 mm
- **Type:** non-pressurized (single-wall)
- **Brand:** IMS

## Fits these machines

- Gaggia Classic GT (58mm portafilter) — https://espressofit.com/machines/gaggia-classic-gt/
- Gaggia Classic Pro (E24) (58mm portafilter) — https://espressofit.com/machines/gaggia-classic-pro/

## Notes

The **single-shot** basket in IMS's B68 series — the Ø68-border line IMS assigns
to Gaggia (alongside Carimali and La Cimbali). At 24.5mm deep with a perforated
area of just **Ø30mm**, it is built to keep resistance up under a small dose:
IMS rates it 7.5–9.5g for a dark roast, rising to 9.5–12g for a light one.

The 253 holes are hexagonally arranged and **circular with a conical cross
section** — the shape IMS's competition line is built around, tapering through
the basket floor so flow accelerates rather than stalls at the exit.

Pair it with the [2-cup B682TH24.5M](/baskets/ims-b68-competition-2-cup/) if you
pull both singles and doubles. Note the geometry difference from the B70 line:
the border is Ø68mm rather than Ø70mm, which is precisely why IMS keys Gaggia to
this series. Verified against IMS's official product page and Competition
catalogue.

## Sources

- https://www.imsfiltri.com/filters/B681TH24.5E.html
  - Official IMS Filtri product page ('B681TH24.5E FILTER BASKET', Competition Series, 1 Cup), read firsthand 2026-07-26. Specs verbatim: 'Border: Ø 68 mm', 'Body: Ø 60 mm', 'Height: 24.5 mm', tamper 'Ø 58 mm', '253 holes in hexagonal pattern', holes 'Circular with conical cross section', over a 'Ø 30 mm area optimized for 1-cup flow'. Capacity 7.5/9.5 gr (dark roasted), 8/10 gr (medium), 9.5/12 gr (light). Amazon listing verified firsthand 2026-08-03: 'IMS B681TH24.5E PRECISION FILTER 1 CUP 6/9 g H24.5' — the B681TH24.5E code in the listing title matches this entry exactly. Add-to-cart present, i.e. actually buyable, at the time of checking.
- https://www.imsfiltri.com/IMS-competition-Catalogue.pdf
  - Official IMS Competition Series catalogue, read firsthand 2026-07-04. Its B68 series heading reads 'B68 (BORDER Ø 68 mm) CARIMALI, GAGGIA, LA CIMBALI' — IMS assigns Gaggia to the B68 series (Ø68 border), not the Ø70 B70 series, which is why B68 baskets cross-reference the Gaggia machines here.

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Compatibility reference, not a substitute for your machine's manual. Every claim above cites the source it came from; see https://espressofit.com/methodology/ for how entries are verified. Corrections: corrections@espressofit.com.