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The MP-20 HMB is Mizuno's answer to a specific problem. You want a thin topline and a compact shape that looks like a blade sitting behind the ball, but you also want the ball to go somewhere when you catch it a groove low. HMB stands for Hot Metal Blade, and the whole point is a hollow-body iron forged from 1025E mild carbon steel that hides its distance help inside a players profile.
This one lives in the Players Distance category, but it earns that label differently than a stamped-out game improvement iron. The lofts are on the stronger side for a forged club. The 7-iron sits at 32.5 degrees and the pitching wedge at 45, so you get ball speed and a flatter trajectory, but the head still finishes small enough to satisfy a good ball striker.
Mizuno built the MP-20 family so you can mix and match, and the HMB is the long-iron end of that conversation. A lot of players run HMB in the 3 through 6 iron and switch to the MP-20 blades or MMC as the numbers climb. On its own it is a full set that gives a low-to-mid handicapper real launch and forgiveness in the long irons without asking them to carry a shovel-shaped head.
In short
The Mizuno MP-20 HMB (2020) is a players-distance iron that blends ball speed with a clean shape. The set runs 3-iron to PW with a 32.5° 7-iron.
Refresh due soon
Brands in this category update about every 2 years, and the MP-20 HMB is 6 years old with no successor yet, so a new model could land any time. Grab it at clearance pricing now, or wait a few weeks to see what replaces it.
Based on release timing and this line's typical refresh cycle, not a live price quote.
| 3i | 4i | 5i | 6i | 7i | 8i | 9i | PW |
|---|---|---|---|---|---|---|---|
| 19.0° | 22.0° | 25.0° | 28.5° | 32.5° | 36.5° | 41.0° | 45.0° |
Stock steel shaft. Lofts are approximate and subject to manufacturing tolerances.
Typical carry by swing speed, adjusted for this set's actual lofts. Your numbers will vary with strike, shaft, and conditions.
| Club | Loft | Moderate swing~134y 7-iron | Average swing~149y 7-iron | Faster swing~163y 7-iron |
|---|---|---|---|---|
| 3-iron | 19° | 166 y | 185 y | 204 y |
| 4-iron | 22° | 158 y | 176 y | 193 y |
| 5-iron | 25° | 151 y | 168 y | 184 y |
| 6-iron | 28.5° | 143 y | 159 y | 174 y |
| 7-iron | 32.5° | 134 y | 149 y | 163 y |
| 8-iron | 36.5° | 124 y | 138 y | 151 y |
| 9-iron | 41° | 114 y | 127 y | 139 y |
| PW | 45° | 105 y | 117 y | 128 y |
Carry distances are modeled from TrackMan-based norms scaled to each club's loft, not measured for this exact model.
The hollow-body construction is the core of it. Where a muscleback iron is a solid piece of steel, the HMB is forged and then hollowed out, with tungsten placed low in the longer irons to drop the center of gravity and get the ball airborne. That tungsten is why a 3-iron this thin still launches. Mizuno Grain Flow Forges the body in Hiroshima, so the feel stays closer to a forged blade than you would expect from a hollow head. Inside the cavity is a vibration dampening structure that kills the hollow, clicky sound a lot of these designs produce. At address the topline is thin, the offset is minimal, and the sole is narrow. It reads as a players iron. The distance and the higher launch are engineered to stay out of sight until you hit it.
The Mizuno MP-20 HMB's 7-iron is lofted at 32.5° - traditional - aligned with classic iron loft standards. For a golfer with an 85-95 mph swing speed, this projects to a 7-iron carry of approximately 141-151 yards. The 5-iron (25°) to 7-iron gap of 7.5° is spread across a wide range, which may create overlapping distance windows with similarly lofted fairway woods or hybrids. The pitching wedge at 45° provides a conventional loft window that pairs cleanly with a 50-52° gap wedge.
HMB means Hot Metal Blade. It describes a hollow-body iron that looks like a blade at address but uses internal construction and tungsten weighting to add ball speed and launch. The name captures the goal, which is blade shaping with more distance and forgiveness than a true muscleback.
Yes, and that is how many players use it. The MP-20 line was designed as a combo system. A common build runs HMB in the long irons where you want easy launch and forgiveness, then transitions to the MP-20 MMC or MP-20 muscleback in the mid and short irons where you want more feel and control. The lofts and lengths are matched across the family to make this transition clean.
They are moderately strong for a forged iron but not jacked to game improvement levels. The 7-iron is 32.5 degrees and the pitching wedge is 45. That gets you extra ball speed and a flatter flight compared to a traditional blade, though it also means you may want to look at your gapping into the wedges since a 45 degree PW leaves a bigger jump down to a standard sand wedge.
It works well for a mid handicapper who strikes the ball reasonably cleanly and wants a compact, forged head. The hollow body and tungsten add real help in the long irons, so a 3 or 4 iron is far more playable than it would be in a muscleback. It is not a max-forgiveness iron though. If you miss the center often, a wider-soled game improvement cavity back will be more consistent.
Better, and that is the selling point. Because the body is Grain Flow Forged from 1025E mild carbon steel and packed with a vibration dampening insert, it gives a softer, more solid sensation at impact than a typical cast hollow-body distance iron. You get the ball speed without the hollow, hot click that turns a lot of players off.
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