FST Pro 125 Stepless Steel Iron Shafts

FST Pro 125 Stepless Steel Iron Shafts

S/X Flex - 370 tip (125g) 4C1H/5C1H
In Stock
1-3 $19.50
4+ $17.50
Tip & Butt Trimming
Tip Prepping

FST Pro 125 Stepless Steel Iron Shafts

The FST Pro 125 Stepless steel iron shaft's tip-stiff design produces the lowest ball flight of any premium FST golf shaft.

  • .370" tip diameter
  • Available in S/X combination flex only
  • Tour-weighted shaft that generally appeals to skilled golfers
  • Stepless profile transfers vibration more evenly from the club head to the hands

Trimming Instructions

FST Pro 125 Stepless Steel Iron Shafts is rated 4.8 out of 5 by 6.
Rated 5 out of 5 by from Very Impressive I have put these shafts into a set of MPC heads. The shafts were tip cut to in between stiff and X flex. The total length was 1/4" over standard. These shafts are just the perfect for me with a driver swing speed average of 107mph and quick transition. The shaft tip is stiff and compares to TTDG in S300 , but the FST pro125 feel a lot smoother then the TTDG. Ball flight is great a strong low/med flight , very similar to S300 . Quality and finish is great and you can place the stickers were you like as they are not pre-set on the shafts. I like these shafts that much I may pull the Hi-Rev shafts in my wedges and fit 3 of these shafts trimmed to the same as the MPC's. If you swing hard with a quick transition these shafts could be a great match and save you some dollars over the big brands.
Date published: 2009-12-01
Rated 5 out of 5 by from FST Pro 125 Strong Purchased these for the price and definitely worth it. Driver speed of 115 mph. Flight went from low/mid and now a nice high ball flight. Very controllable and it also didn't take any distance away. Loving life. I had the shaft cut from 43" to .5" down to my Pitching Wedge. Couldn't get my 3 extra wedges only because of the tips being to big, a little upset but, still stuck to FST with the KBS and "WOW". FST won't let me down. Very Happy with these purchases.
Date published: 2013-07-02
Rated 5 out of 5 by from Smooth Steel Shaft Very Smooth compared to DG SL R300. I konw DG SL is lighter than Pro 125 but I compared those shafts during a test with Tricept F1. Keep it in Stiff trim, just enough to put power and to have a smooth response. Best value for the money regarding quality, weight and tip type. Now, I have to try Hi-Rev shaft for my wedges.
Date published: 2009-12-15
Rated 5 out of 5 by from Great low cost shaft. worked perfectly. replaced for my brother in law cause he broke 2 shafts. These worked great and were an awesome price for such a good quality shaft. Trimmed them so they will play like a project x 6.5
Date published: 2016-04-18
Rated 5 out of 5 by from Terrific shaft at a great price. A top quality steel iron shaft with a solid, stiff feeling tip - with better feel and a better price than the competition - from the manufacturers of KBS.
Date published: 2015-10-23
Rated 4 out of 5 by from Ok for the price There not a bad shaft but they play softer than i expected. After checking the s flex plays equal to a TT DG R300.
Date published: 2015-03-28
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Wanting to build a set of same length clubs with a spare set of Pings I have. Would these shafts be a recommendation?

Asked by: ACinSC
The FST 125 shafts will not fit the Ping I irons. The Ping I irons use a .355" taper tip shaft and the FST shafts are only available in .370" parallel tip which is to large to fit the Ping irons. The least expensive .355" taper tip shaft we sell is the TT Lite XL (2XLI). If you are making these the length of a 7 iron you would need to order all 7 iron shaft. If you are using a 6 iron length then order the raw length shafts for the 6 iron.
Answered by: JimY
Date published: 2017-02-13

How will these play if tipped to X flex with a 1 soft step in comparison to the same setup with KBS Tour C-Tapers? Similar flex? Softer?

Asked by: Chris
The FST 125 trimmed to an X flex would still play more flexible or softer then the C-Taper soft stepped one club. The FST shafts test almost a full flex softer then normal and the C-Tapers test a little stiffer then normal.
Answered by: JimY
Date published: 2017-02-07

Can I use collared ferrules on these shafts in the MMB-17 heads? I so, which ones are recommended?

Asked by: Chris
No, collared ferrules will not fit the MMB-17 irons. In our catalog we recommend the 74PI which is a plain black ferrule but you could use an .370" non collared ferrule with these irons. http://www.golfworks.com/golf-club-iron-ferrules-black/p/60PI/ http://www.golfworks.com/golf-club-iron-ferrules-colored-trim-ring/p/52PIS/
Answered by: JimY
Date published: 2017-02-07

I have the callaway diablo forged irons with the nippon 1100 uniflex shaft in them.how will these play as feel and ball flight and how should i tip trim them. thank you

Asked by: fonz57
The Nippon 1100 Uniflex shaft was made for Callaway so I do not have any specifications other then it weighted 110 grams. The FST 125 is a heavier shaft but it is a shaft that tests and plays more flexible then normal The FST 125 is a combinations S/X flex shaft. You would follow trim code IR33 for the S flex and IR35 for the S flex. There is a 2" difference between the trimming for an S and X flex. You could tip trim 1" more on top of the recommendation for the S flex to make the shaft play in between the S and X flex. The FST shafts tend to play more flexible then normal and your ball flights might be similar. You will likely feel the shaft weight difference.
Answered by: JimY
Date published: 2016-10-04

I currently game the new King F6 irons with the stock shaft offering in regular flex.  However, I have been fitted with the Mizuno Swing Analyzer for KBS C-Taper Stiff.  How would the Pro 125 compare with specs, stopping power and mid-low flight? 

Asked by: Will
The stock steel shaft in the King F6 irons is listed as an FST Flighted Steel and weights about 110 grams. Chances are if you reshaft with the Pro 125 it will not play much different then the stock shafts. The C-Taper tests stiffer then normal and plays a little stiffer then normal and the Pro 125 test and plays quite a bit more flexible then normal.
Answered by: JimY
Date published: 2016-05-31

Can you suggest trimming specs of the 125 pro to compare to c-taper lite stiff flex?

Asked by: Greanbay
To get the FST 115 Stepless Steel shaft to play similar the the C-taper lite S flex you would need to use the S/X flex 115 and tip trim it to possibly to the X flex. The 115 Stepless steel shafts play noticeably more flexible then normal.
Answered by: JimY
Date published: 2016-05-26

I have a set of Callaway Razr x back irons with the TT M-10 XP shafts in them. I would like to lower ball fight. What trimming would compare to KBS c-taper lite 110 stiff? My gamers have that shaft and would like to get flex similar.

Asked by: Greanbay
To get the FST 115 Stepless Steel shaft to play similar the the C-taper lite S flex you would need to use the S/X flex 115 and tip trim it to possibly to the X flex. The 115 Stepless steel shafts play noticeably more flexible then normal.
Answered by: JimY
Date published: 2016-05-23

I want to get these to play to at least the stiffness of a project x 6.5 or dynamic gold x100 or greater. I have heard that FST plays slightly weaker. Would I need to tip cut them more than the recommended amount? If so how much. THAnks 

Asked by: smmaddalena
If it were me and I wanted these to play in a 6.5 stiffness range I would consider just tip trimming the shaft to the finished length of each iron. I would do not butt trimming at all.
Answered by: JimY
Date published: 2016-03-30
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