EN-GJL-250 (GG25) is the same material your supplier may list as ASTM A48 Class 35 or JIS FC250. This page maps the designations across standards and gives the ISO K-group machining starting point, brand-neutral.
| System | Designation |
|---|---|
| EN (EU) | EN-GJL-250 (GG25) |
| Werkstoffnummer | EN-JL1040 |
| AISI / ASTM / UNS (US) | ASTM A48 Class 35 (nearest) |
| JIS (Japan) | FC250 |
Compiled from the public standard designation systems (EN 10027, SAE/AISI, ASTM, UNS, JIS). Entries marked “nearest” are the closest commonly-cited counterpart, not a drop-in equivalent. Always verify against the material certificate.
At least one designation on this page is a nearest commonly-cited counterpart rather than a same-composition equivalent (structural and cast grades are specified by properties, not chemistry). Confirm suitability against the material certificate and the drawing requirement, not this table alone.
Grey iron is graded by tensile strength, so cross-standard matches are nearest-by-class. Short chips, abrasive cast skin: run dry, take the first cut under the skin, K-group data.
| ISO group | Starting Vc (coated carbide, turning) | Feed fn |
|---|---|---|
| K K · Cast iron | 100–250 m/min · 330–820 sfm | 0.2–0.5 mm/rev · .008–.020 ipr |
Group-level starting range from our speeds & feeds guide; convert to RPM with the speeds & feeds calculator. Condition, subgroup and operation shift the number — the material page has the detail: ISO K · Grey cast iron.
EN-GJL-250 (GG25) (Werkstoffnummer EN-JL1040) corresponds to ASTM A48 Class 35 (nearest) as the nearest commonly-cited counterpart — check the certificate before substituting. In JIS terms the counterpart is FC250.
It is an ISO K-group material, so the starting window is 100–250 m/min · 330–820 sfm at 0.2–0.5 mm/rev · .008–.020 ipr for coated-carbide turning, adjusted for condition and operation. For a grounded, brand-neutral pick — grade, geometry and cutting data across 13 brands — ask the advisor.
Not automatically: this pairing is nearest-by-properties, and structural or cast grades are specified by mechanical requirements. The drawing standard and the material certificate decide, not the cross-reference table.
Knowing the material is half the job; picking the grade and cutting data for the operation is the other half. That is what the advisor does, grounded in catalog data and honest when there is no verified match.