Mizuno has introduced its new JPX921 Series of irons, using Chromoly in a full body forged iron for the very first time.
The JPX921 Forged is the latest in the evolution in the JPX Series. The JPX921 Tour, JPX921 Hot Metal and Hot Metal Pro are engineered to help performance for particular swing types.
The JPX921 Forged offers the fastest ball speeds Mizuno has ever produced from a fully forged iron;. The JPX921 Tour blends precision with enhanced stability from off-centre strikes and the JPX921 Hot Metal and Hot Metal Pro represent the third generation of Mizuno irons to be crafted from high-strength Chromoly 4140M.
“Applying the potential of Chromoly means that the JPX921 irons hold their own in any simulator test, without having to crank 7 iron lofts at all cost. Look, feel, launch, spin and landing angles have to be right through the set–ltimately what sets Mizuno irons apart,” said David Llewellyn, director of R&D for Mizuno.
The JPX921 Forged iron integrates the power of Chromoly into a full body forged iron for the very first time. Initially applied in Mizuno’s Hot Metal irons, Chromoly has made the crossover to Mizuno’s and testing shows the fastest ball speeds Mizuno has ever produced from a fully Forged iron.
Grain Flow Forged HD in Mizuno’s facility in Hiroshima Japan, the JPX921 Forged irons offer an identifiable Mizuno feel. The integration of Chromoly 4120 allows for a clubface up to 0.5mm thinner.
Additional perimeter weighting with toe bias creates a Stability Frame to maximize results from off-centre strikes, while a 6.4 per cent wider CNC back milled slot further increases stability.
Despite this, the JPX921 Forged irons offer a sleeker, compact profile, a shorter blade length throughout, a beveled training edge and reduced offset. The feel is that of a traditional forged iron as the JPX921 Forged gets noticeably sleeker throughout the set.
Th JPX921 Forged is available in: 4-GW RH and 4–5 iron LH, combining with 6-GW JPX921 Tour in SEL (see below).
The most chosen Mizuno model among non-contracted professionals, the JPX900 Tour and JPX919 Tour were both played in major championship wins.
The new JPX921 Tour maintains its predecessors’ fusion of precision with stability from off-centre strikes. It’s now even thicker behind impact for an enhanced, softer feel with tour refined short irons for smoother turf interaction.
Grain Flow Forged HD from 1025E Pure Select Mild Carbon steel, the JPX921 Tour delivers an identifiable Mizuno feel. In addition, Mizuno’s Stability Frame with toe bias weighting promotes a longer, straighter and more consistent ball flight, even on off-centre strikes.
The shorter irons feature a narrower sole for improved turf interaction while a thicker cavity pad throughout the set, evolving from Mizuno’s study of vibration patterns, produces a harmonic impact that can be felt for a fraction longer.
With a pearl brush, anti-glare finish to minimize distractions over the ball, the JPX921 Tour offers the sharper, stripped-back functional look.
The JPX21 Tour is available in 4-GW RH, with 6-GW LH combining with JPX921 Forged in SEL (see below)
JPX921 Special Edition Leftie (SEL)
The first left-handed Mizuno JPX Tour irons since it’s conception in 2016, the JPX921 Special Edition Leftie (SEL) is built into a combination set with JPX921 Forged long irons (4-5) and JPX921 Tour mid and short irons (6-GW) for a balanced set up. Lofts have been pre-adjusted for distance gapping between the models.
JPX921 Hot Metal / Chromoly 4140M
The JPX921 Hot Metal represent the 3third generation of Mizuno irons to utilize the resilience of Chromoly. The Mizuno R&D department generally accepts that any new technology needs three generations to reach near-peak performance.
The JPX921 features Mizuno’s most complex face geometry to date. To produce additional energy from the clubface, the Hot Metal Pro version offers a more compact profile with reduced offset.
The use of Chromoly 4140M and a re-engineered CORTECH face, now 0.2mm thinner across the centre point, creates increasd ball speeds. The Seamless Cup Face featuring a variable thickness sole design allows the leading edge to act as a hinge, generating greater flex.
Three additional sound ribs produce a more solid sensation at impact while extreme perimeter weighting and toe bias in Mizuno’s Stability Frame help to deliver greater consistency from off-centre strikes.
“The introduction of Chromoly was the breakthrough Mizuno needed to take a step up in ball speed. We learn more about the potential of Chromoly with each generation and push it further each time,” said Llewellyn.