The Grain Flow Forging process was patented in 1998 – to create a precise iron head through multiple forging stages from a single billet of steel. Begin exploring what makes Grain Flow Forging a unique process…
Cast or ‘form forged’ head with loss of internal grain structure
Mizuno Grain Flow Forged with tight, reinforced grain structure.
One piece Grain Flow ForgingNeck and head are forged from the same single billet of steel, ensuring continuous grain through the head.
Competitor forged iron with welded neckUnlike a Mizuno Grain Flow Forged iron the iron is made with two parts – with no continuous grain through the head.
Click the heads below to hear the difference between cast and forged club heads
Raw Cast Iron
Polished cast iron
Grain Flow Forged iron
The first iron models produced through this refined process were the Pro MT and Mizuno Pro VS.
Each head within Mizuno's incredible TN‐87 was individually shaped by leading tour player Tommy Nakajima.