Mizuno JPX-850 Forged Irons

Mizuno JPX-850 Forged Irons

Mizuno’s new material is 30% stronger than traditional 1025E steel billets – allowing for a thinner face and extreme ball speeds.
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JPX-850 Forged Iron Set

Born Out of Boron.

After 6 years of development - the introduction of BORON to Mizuno’s Grain Flow Forging process allows the JPX-850 Forged to overcome the distance limitations of traditional forged irons.

Mizuno’s new material is 30% stronger than traditional 1025E steel billets – allowing for a thinner face and extreme ball speeds. The result is an incredible iron that combines Grain Flow Forged precision and feel with shocking distance. A combination that was unachievable before BORON.

This new, thinner face is strategically reinforced by a Power Frame cavity which places weight to the extreme corners of the club head for maximum forgiveness along with increased distance. A clean, sleek design combined with these breakthrough technologies delivers an iron that looks and plays like nothing before.

Key Technology

  • Power Frame: Enables entire face to flex for increased ball speeds and distance.
  • Grain Flow Forged 1025 BORON: 30% stronger material for thinner face and longer distance while delivering soft, solid, consistent feel.
  • Ultra CNC Milled Pocket: Higher launch angle and increased ball speeds in 4 through 7 irons.

Standard Shaft: True Temper XP 115 – R300, S300
Standard Grip: Mizuno M-31 360 .58 Round

“This is distance generated by genuine technology, rather than just cranking lofts or using longer shafts. It used to be that you had to give up distance to play a Forged iron … but with the JPX-850 Forged you no longer have to.”
-Chris Voshall, Senior Engineer

Mizuno JPX-850 Forged Irons Expert Review

Written By: Bob Gomavitz

Player Stats:
  • Age: 57
  • Handicap: 4.6
  • Years Playing Golf: 45
  • Being an absolute equipment junkie, I was approached by GolfDiscount.com to write reviews and share my findings with you. Having been chosen to write a number of Taylormade product reviews for GolfWRX.com I felt that this is an excellent opportunity to put my knowledge to use.


The Takeaway

The JPX 850 Forged features Mizuno’s Power Frame Technology. To increase forgiveness, the Power Frame Technology distributes the weight to the 4 corners of head. The Dual Max COR Pocket offers an increased rebound area for max distance. Add in their thinnest-ever, multi-thickness face for higher ball speeds and you have one hot head! The sole offers players a dual relief design for solid ball striking. Add in the Grain Flow Forged Boron steel that is 30% stronger than the 1025E steel and you get an even thinner face.

Who's It For?

I would have said in the past that Game Improvement irons are more for 18+ handicappers. Purists most likely will still walk by this section in the stores, but so be it. Now, pretty much any type of player can play this class of Game Improvement irons without hesitation, and there is one main reason. What held back the better players in previous years from using this class of iron was the hot spots, or jumpers as they’re called, which creates inconsistent distances from the same club number. The OEM’s have done a fabulous job correcting this issue with better technology in head and groove design.

Final Take

One of the best looking Game Improvement irons out there, no doubt. Simple, clean and efficient. If feel comes first and then forgiveness, this is the head that you need to try. The playability was very close to the non-forged version, but with even better feel. The ball flight was maybe a touch lower, but tight. Cosmetically, I prefer this head over the blue backed, non-forged version. Best looking Game Improvement head on the market.

Club Tested: 6-Iron; Shaft: Nippon 950; Loft: 28°

Read the 2015 Game Improvement Irons Guide
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