What does FG 260 mean?

FG is grey (flake graphite) cast iron in IS 210, and 260 is its minimum tensile strength in MPa, measured on a separately cast test bar.

Is FG 260 the same as GG25?

They are close equivalents (GG25 is now called EN-GJL-250).

Can grey cast iron be welded?

Only with special methods and care (preheat, nickel electrodes, slow cooling), usually for repairs. Design new parts so they do not need welding.

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FG 260 grey cast iron

Also called: FG260, grey cast iron, CI casting, GG25, EN-GJL-250, ASTM A48 Class 40, IS 210

FG 260 is a grade of grey cast iron from the Indian standard IS 210; the number is its minimum tensile strength, 260 MPa. Grey iron casts easily, machines well and damps vibration, so it is used for machine beds, housings, pump bodies and brake parts.

Quick facts

Standard: IS 210 (grey iron castings)
Tensile strength: 260 MPa minimum (test bar)
Typical hardness: About 180–230 HB
Structure: Graphite flakes in a mainly pearlitic matrix
Strengths: Castability, machinability, vibration damping, compressive strength
Weakness: Brittle: low elongation and impact strength

Grades of grey cast iron (IS 210)

Grade	Tensile strength (min)	Closest European / old German
FG 150	150 MPa	EN-GJL-150 / GG15
FG 200	200 MPa	EN-GJL-200 / GG20
FG 260	260 MPa	EN-GJL-250 / GG25
FG 300	300 MPa	EN-GJL-300 / GG30

ASTM A48 Class 40 is close to FG 260. Strength in the actual casting depends on the wall thickness.

Typical uses

Machine tool beds, columns and bases
Gearbox and pump housings
Valve bodies for low pressure
Brake drums and discs
Flywheels and pulleys
Engine blocks and cylinder liners

Grey iron or SG iron?

Grey iron is cheaper, easier to cast and damps vibration better, but it is brittle. SG (ductile) iron is much stronger and tougher, and is chosen when the part takes shock or bending loads.

Need parts made in FG 260 grey cast iron?

Post your requirement free. Workshops that take your kind of work see it and get in touch. You only talk to the ones that fit.

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Related job work

Machines

Materials

SG iron 500/7

Questions

What does FG 260 mean?: FG is grey (flake graphite) cast iron in IS 210, and 260 is its minimum tensile strength in MPa, measured on a separately cast test bar.
Is FG 260 the same as GG25?: They are close equivalents (GG25 is now called EN-GJL-250).
Can grey cast iron be welded?: Only with special methods and care (preheat, nickel electrodes, slow cooling), usually for repairs. Design new parts so they do not need welding.

The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 8 October 2026.