575 MMC Forged

575 MMC Forged Irons

A Combined Progressive Cavity and Muscleback Forged Design with each Back Design Fully Made by Precision CNC Machining


  • Wishon Golf  Designed the First Forged Iron Created by CNC Machining  – the 575MMC machined muscle cavity irons take the precision of a CNC Machined forged iron to a higher level
  • Mixed Muscleback and Cavity Back Forged Design created for better players who prefer a more compact profile
  • Cavity Back in the Long and Mid Irons for moderate off-center hie forgiveness with blade muscleback design in the short irons
  • Progressive Weight Design extends throughout the full set – the CNC Machined cavity on the #3 to 7 irons gradually moves weight from a low to mid cavit y level.  The CNC Machined muscleback progresses the back weight from mid to higher
  • The 575MMC #8-Wedges are First CNC Machined Muscleback Irons ever created in the industry for precision in CG and weight distribution
  • CNC Machining Pattern Technology results in a beautiful milled surface texture.  575MMC available in RH in cavity back #3 – #AW with muscleback #5 – AW


A 360º view of the 575MMC CB Clubhead.

A 360º view of the 575MMC MB Clubhead.

Ratings and Reviews

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Rating: 4.0/5 (217 votes cast)


575 MMC Forged, 4.0 out of 5 based on 217 ratings


  1. Oh, also why 1035 instead of the mainstream 1025 or even S20C for the forged irons for softer feel? Simply cost or other concerns involved in the designing process?


    • Wilson
      Carbon steels softer than 1035 tend to ding and mark up much easier than do those of the 30 level and higher. Processing of the 1035 in the forging dies tends to be more consistent in our experience than with softer steels. In the end it is an absolute myth that the 20 series carbon steels are better in anyway for making a forged iron. There just is no advantage whatsoever to using the 20 series steels in iron head production.

  2. Happy 2019, Tom.

    I am thinking about using 575mmc heads on my daughter’s current junior graphite shafts. Questions arise as such:

    1.) With 5 iron 36 inches long at play, for example, would the additional club head weight of about 13 grams require us to tip the shaft by 0.5 or even 1 inch in order to maintain the same flex and bend profile? Or, it will be “softer” with the additional weight? For reference, My daughter’s current 8 iron club head weighs 261 grams compared to 575’s 274 grams.

    2.) Can the weight bore design in the hosel be ignored and insert the shaft as usual in order to minimize the swing weight?

    Thanks, much appreciated !

    • WILSON
      If your daughter’s 8 iron head weighs 261g then it is a head specially made for use by junior golfers and not by adults. The 575s certainly could be played by any golfer but only should be used if the player is able to play with adult swingweights and at lengths that are within +/-1″ of adult lengths. In addition because it is a shallow cavity back design it is not the best iron model to be used by a player who is not at least a 12 handicap or better. Unless she is definitely able to retain her swing timing and tempo and rhythm with the heavier head weights of the 575, she should not consider using them. The weight bore is there to allow clubmakers to increase head weight when needed should the golfer need to play normal swingweight ranges when the shaft is very light or when the length is a little shorter than standard. The weight bore is 7.5mm diameter so it is impossible for the shaft to penetrate down into the weight bore. The heads do not come lighter than 274g with their normal +/-3g weight tolerance. At a length of 36″ the 5 iron would play and feel about 6 swingweight points heavier than your daughter’s current irons. If she is not able to handle that much of a swingweight increase then in no way should she be thinking of using this design.

      Hope this helps,

    • First of all, thanks so much for the comments and expertise, Tom.

      It is so cool, having the original club designer to try to talk me out of purchasing a brand-new set of club heads he designed. This is the true passion and spirit of golf, much appreciated.

      I did not quite describe the situation that we are facing for my daughter in detail. We lengthened her junior driver by two inches last week and the swing weight increased to B1 (she can maintain her tempo and posture still and is ok with that). As a result, the irons and wedges become too light with the current setup. That is why we are thinking of replacing the club heads with heavier version and yours happen to come about 4, 5 grams lighter than the mainstream club heads with the hosel bore size of .370 (which is handy).

      Ideally, the irons should have slightly heavier swing weight than that of the driver, yes? So B2 or B3 is fine at this point for the irons/ wedges (at least B1). Not to disappoint you, at age of 10, her handicap from the age-appropriate forward tees is pretty much zero (par 5s usually around 380 yards or so) and she shoots under pars regularly. From adult lady tees, the handicap is 10. Over the past two years, she finished in the top 3 in the annual junior world championships.

      Having said that, we still cannot let the club head be too heavy for her. So, is it ok to leave the weight bore in the hosel empty/ hollow and just assemble the shaft as usual? That is really the key. She does not want forgiving (may be foolish to say that though), she wants to feel where she hits it every time and improve from there. Of course, heavier heads may require further tip trims of the current shaft by 0.5 inch or so (.370 tip, 48 grams).

      Please kindly advice us whether it is ok to leave the weight bore in the hosel hollow. Otherwise, we may still buy the 575 MMC heads for her future use simply becuase of the beauty and quality of it.

      Once again, thank you very much for the inputs! We really appreciate the way you conduct your works.

    • WILSON

      IT is always my pleasure to be able to respond personally to help you. I really like this part of my work to be able to have personal contact with people who are interested in club technology and in my design work. I appreciate that very much.

      Thanks for taking the time to explain more clearly what you are asking. Yes, for sure, it is completely ok to build any of my models with the weight bore empty. It only exists to provide a way to increase the headweight whenever the clubs need to be made to a higher swingweight to fit the golfer . Leaving the weight bore empty is completely normal and OK. From your quoting of the swingweights and specs, I can tell that you know what you are doing to help your daughter have properly fit clubs to play with.

      And I must say, I am VERY IMPRESSED with your daughter being only 10 but being able to play as well as she does. I do hope she continues her growth in the game and that the game is always going to be fun and enjoyable for her to play. Best wishes in this great game.

    • Thanks, Tom, for the kind words. My daughter started at age 5 and she loves the game, even in cold rainy days (but that is kind of training already). The 575s are conforming to USGA and R&A rules, correct? We certainly do not want being reported in international tournaments in the coming years.

      One last question, why did you design the iron club heads 4 grams lighter than all others in the first place? Simply to be more flexible in adjusting swing weights?

      Once again, you love what you do and people like that a lot! Much appreciated, sir!

    • Wilson

      Yes, the 575 forged irons are all conforming to the USGA/R&A rules of golf. I have never thought of the head weights I choose for my iron designs as being lighter. These weights are what I have used for my iron models for a very long time. If you refer to big company irons which are only designed to be built to one series of standard specifications, it may be that the irons you have seen which are 4g heavier were made that way to specifically end up with a standard swingweight when built with a slightly lighter shaft at a standard length with a standard weight grip. I design my heads for custom clubmakers to build. That means I have to choose a weight that with the help of the weight bore in each head will allow the widest range of swingweight for the most commonly pursued shaft weights, length and grip weight. The weights I choose seem to allow the widest range of possible custom fitting assembly requirements.

      Thanks again for your interest for sure !

  3. Tom—I’ve had my 575s since 2014 and they’ve been great. Gary Pickle fitted me in TX. Since then, my swing has changed a bit and I’ve gotten a bit older, but my handicap and distance is the same. My longer irons in the set (5,6,7) are feeling heavy and are really inconsistent. I’ve actually taken to choking down on them by about an inch or inch and a half because it feels like I have to heave them a bit from the top to get them to the ball. Would you recommend having someone look at them again for me and retool them a bit or should I go to a completely new set? I now live in the Jacksonville, FL area. Thanks very much for your input.

    • BROCK
      First off you did good by working with Gary. Not only is he very knowledgeable in his fitting work but he is as entertaining of a guy as you can meet! He’s moved his shop and life down to the Lake of the Ozarks these days though so the Dallas area is certainly missing him now I think.

      From what you say it sounds like you need to reshaft the irons with a lighter weight shaft and possibly also drop the swingweight. But first off the lighter shaft will drop the total weight of the irons which is what they weigh if you put them on a normal scale or just hold the club in both hands off the ground to feel the sum of the head + shaft + grip weight. Often times a change to a lighter shaft also causes the head to not feel as heavy during the swing. So if your sense of the irons feeling heavy now is such that you perceive the HEAD WEIGHT to feel too heavy, a drop in shaft weight might be enough to relieve this heavy sensation. Either way, this is where you need the services of a decent clubmaker to do the changes.

      Best way to go is to take ONE of the irons and have it re shafted with a shaft that is of the same flex but lighter by at least 20-25 grams over the shaft in the irons now. Have the swingweight set at about 2 to 3 swingweight points lower than what it is now in the irons. Then take that one iron and go out and hit shots for 3-4 sessions over the course of 8-10 days at least to see what you feel and think about it before you make any further decisions for whether to do all the irons. Weight feel things like this can really only be solved by trial and experimentation based on the advice like I offered here as the starting point for investigation. This is because we all have our own impressions of what feels heavy, what doesn’t, and whether the too heavy feel is more coming from the overall total weight or the swingweight/head weight feel.

      Hope this helps,

    • Thanks very much, Tom. Gary was fantastic. I’ve described his fitting process to a lot of golfers and they’re all blown away. He was fantastic and a great guy like you said. I’ll give the reshaft test a shot. Appreciate the help!

  4. I am an engineer that relishes knowledge captured from fixing, building, and tinkering. Recently discovered your videos and writings. Great information and enjoy the detail you share. Age has slowed my swing speed and steel shafts transmit too much discomfort. Assembled a couple sets of irons with graphite shafts for myself and a friend based on my fitted set over 15 years old. Although I improved more than 10 strokes, noticing some “feel” issues. Have to think too much about the right swing mechanics for each club. Thinking it is time to try MOI matched irons. Going to try my hand at making a set with your 575MMC Cavity backs at .375 shaft increments hoping to reduce standing over the ball thinking about how to swing the particular club in hand.

    • JIM

      Thanks much for your interest and your enjoyment of what we try to do with the information. Much appreciated. Send me an email at tww@wishongolf.com and ask me to send you a copy of the Excel spreadsheet we have for calculation of the MOI of any golf club. It’ll make the job a whole lot easier than doing it with the 3/8″ increment and 1/2 swingweight progression that some advise in lieu of having the proper equipment or information. You can still do the lengths in 3/8″ increments with the spreadsheet but it just makes it all much more accurate.


    • Hi Tom,

      I had my irons MOI matched a few years ago and really loved them and would like to have it done again with my current irons (575 MMC). The club fitter I know at my club (not Wishon certified) says the shafts need to be parallel tips to do it properly. I wasn’t aware of this. Is this correct or false information? Grateful for any info. Craig

    • CRAIG

      MOI matching can be done with any shaft regardless of weight, flex, bend profile or tip size. Now if the clubmaker is trying to do both MOI matching AND frequency matching at the same time, that becomes more of a pain in the neck with taper tip shafts vs parallel tip shafts, but it can still be done. But for MOI matching on its own, that can be done with parallel or taper tip version of a shaft with no problems. The tip configuration of a shaft has nothing to do with the club’s MOI. MOI is all about length, total weight, balance point and headweight. Not flex or bend profile.


  5. Hi I am 10 handicap and have been playing with an snake eyes 600 XC. How soft are this Irons? thanks

    • Most likely that iron is forged by Virage Tech Industrial which means the steel is a 1030 carbon steel which when finished should have a hardness on the Rockwell scale of HRB 85. That’s pretty typical for hardness when compared to just about every other forged carbon steel iron on the market today because, 1) there are so few forging companies around these days, 2) they all tend to use 1020/1030 carbon steel alloys which all end up being very close to the same hardness.


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