That model name is an IMS product code — series, cup count, height and hole pattern are all encoded in it. IMS basket codes, decoded explains how to read one, and lists every code covered here.
The shallowest basket in IMS’s B70 line at 19.5mm — a true single-shot
basket rated 7–9g for a dark roast and 9–11g for a light one. Single baskets are
unforgiving because the puck is thin, so the shallow, narrow bed and the modest
177-hole count (0.30mm, normal pattern) are doing deliberate work: less open area
than a double keeps resistance up at a small dose.
If you mostly pull doubles, the H24.5
or H26.5 1-cup baskets sit higher in the
range. Standard B70 geometry otherwise — Ø70mm border, Ø60mm body, 60.5mm
external ridge — and the same official B70 fitment: La Marzocco, Rancilio, Lelit,
Rocket, ECM and the Breville Oracle. Gaggia is B68, not B70. Verified against
IMS’s official product page and Competition catalogue.
Other items confirmed to fit machines this one fits — useful if you're kitting out a single setup. The count is how many of those machines overlap; nothing here is a new fitment claim.
What size portafilter is the IMS B70 Competition 1 Cup H19.5 (B701TH19.5N) for?
It is a 58mm basket, 19.5mm deep, for 58mm portafilters.
Is the IMS B70 Competition 1 Cup H19.5 (B701TH19.5N) pressurized?
No — it is a non-pressurized (single-wall) basket, for freshly ground coffee.
Does the IMS B70 Competition 1 Cup H19.5 (B701TH19.5N) fit 54mm machines like the Breville Barista Express?
No. It is a 58mm basket, so it does not fit Breville's 54mm machines or any 54mm portafilter.
Which machines does the IMS B70 Competition 1 Cup H19.5 (B701TH19.5N) fit?
Breville Oracle; ECM Estetika; ECM Mechanika MAX II; Flair 58; La Marzocco GS3; La Marzocco Linea Micra; La Marzocco Linea Mini; Lelit Bianca (PL162T); Lelit Elizabeth (PL92T); Lelit Kate (PL82T); Lelit MaraX (PL62X); Lelit Victoria (PL91T); Rancilio Silvia; Rancilio Silvia Pro; Rancilio Silvia Pro X; Rocket Espresso Appartamento; Rocket Espresso Epica; Rocket Espresso Giotto Fast; Rocket Espresso Mozzafiato Fast; Rocket Espresso Porta Via; Rocket Espresso R Nine One — each confirmed against manufacturer sources (listed below).
Sources
https://www.imsfiltri.com/filters/B701TH19.5N.html(archived) — Official IMS Filtri product page ('B70 1 Cup - H19.5 Competition'), read firsthand 2026-07-26. Specs verbatim: 'Border: Ø 70 mm', 'Body: Ø 60 mm', 'Height: 19.5 mm', tamper 'Ø 58/58.4 mm', ridge 'External Ø 60.5 mm', '177' holes of 'Ø 0.30 mm' in the 'Normal pattern'. Capacity 7/9 gr (dark roast), 8/10 gr (medium), 9/11 gr (light).
https://www.imsfiltri.com/IMS-competition-Catalogue.pdf(archived) — Official IMS Competition Series catalogue, read firsthand 2026-07-04, whose 'For tamper 58 / 58.4' B70 compatibility list names La Marzocco, Rancilio, Lelit, Rocket, ECM and 'BREVILLE (The Oracle)' among the fitting brands — and 'FLAIR ESPRESSO (58)', which is why the Flair 58 is cross-referenced here; Gaggia is assigned to the narrower B68 series, so B70 baskets do not cross-reference Gaggia machines.