Grover F-Style 309 Mandolin Tuning Machines

  • 15 Reviews
  • Write a review

Grover F-style mandolin tuners are available in two different gear configurations, with engraved die-cast baseplates and 18:1 gear ratio.

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Worm under string post, nickel, 4L/4R

Item # 5675
In stock, ready to ship!


3 or more $53.11
6 or more $48.33

Worm under string post, gold, 4L/4R

Item # 5675-G
In stock, ready to ship!


3 or more $71.29
6 or more $64.88

Worm over string post, nickel, 4L/4R

Item # 5674
In stock, ready to ship!


3 or more $53.11
6 or more $48.33

Worm over string post, gold, 4L/4R

Item # 5674-G
In stock, ready to ship!


3 or more $71.29
6 or more $64.88
Quantity Discount Prices apply when you buy multiples of the same item number.
Total: $0.00
Quantity: 20


Grover F-style mandolin tuners are available in two different gear configurations, with engraved die-cast baseplates and 18:1 gear ratio.

These are complete sets of 4-left/4-right tuners on two baseplates, with removable pearloid plastic knobs.

Standard 29/32" (23mm) string post spacing; screws and knurled press-fit bushings included. 11/32"-diameter (8.73mm) pegholes required.

Available in two different gear configurations:
#5675 with worm gear under string post (turn the the knob counterclockwise to tighten the string)
#5674 with worm gear over string post (turn the knob clockwise to tighten the string)
Important: These two styles may not be interchangeable on the same peghead.
See Specs before ordering.

Tip: Plate-mounted tuners can't work efficiently if the pegholes are improperly drilled. Our Mandolin Peghead Drill Jig ensures precise 29/32" spacing for accurate alignment for these tuning machines.

    • Item #
    • Weight
    • 5674
    • 0.442 lbs. (0.2 kg)
    • 5674-G
    • 0.450 lbs. (0.2 kg)
    • 5675
    • 0.448 lbs. (0.2 kg)
    • 5675-G
    • 0.450 lbs. (0.2 kg)

Ratings & Reviews

Grover F-Style 309 Mandolin Tuning Machines

  • Based on 15 Reviews
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Swapping out Gotoh tuners on the Loar M-600

By Stephen Gallagher from Reno, NV 
(Customer's Reviews) Monday, December 08, 2014

I have a Loar M-600 mandolin which comes stock with Gotoh tuners. I've had real trouble keeping in tune and getting to proper tune with the strings jumping sharp of what I'm trying to achieve. I decided to try Grovers with a lower gear ratio. I have to tell you that they work great! Installation was easy. The machine holes lined up and three out of the five screw holes lined up. I used the existing bushings and screws. All I had to do was drill pilot holes at each end of the back of the machines in place on the mando scroll. The original screw holes are covered by the back plates and do not interfere with the new holes. The Gotoh machine plates extended a little further toward the nut side of the tuners so you can see a slight impression of the end of the plate in the wood on the back of the scroll. Not a big deal. The tuners are far superior and make tuning to proper pitch a snap. Delivery from Stew-Mac was quick. Money well spent.

Good fit for the Epiphone MM-50E Mandolin

By Rayman from Franklin, OH
(Customer's Reviews) Monday, May 13, 2013

If you are considering these tuning machines for your Epiphone MM-50E I would highly recommend them. Perfect fit, easy tuning & stays in tune unless you bump or turn the keys. I have used them on mine for a month and I love them!

great tuners

By Ferenc from Berlin, Germany
(Customer's Reviews) Thursday, January 03, 2013

I've installed them on my new Eastman, I didn't even had to drill new holes, they really do fit and what's more important, work perfect. Now i'm thinking of replacing the tuners on my Gibson A1 also. As for the shop: super fast delivery, that is how an internet shop should work! thank you! It did not take more than 3 days including German customs after ordering!

Grover Tuners

By Steve Hinde from New Hartford, IA
(Customer's Reviews) Thursday, December 13, 2012

Excellent tuners for the price. Posts seem a bit loose at the base and can be loose after installation. But under load function ok. Would be nice to have a counterbore bit with 1/4 pilot the right size for the bushings. Would also be nice to have button options. Real mop or ebony or ivoroid. I also saw some differences in the mounting screws. Some bright brass and some matte in the same set.

Excellent Value

By The Lefty Luthier from Spring Branch, Texas
(Customer's Reviews) Wednesday, November 28, 2012

These tuners are every bit as good functionally and visually as Waverlys. I see no reason to spend a dime more than what these tuners cost unless the customer prefers status over functionality.

Washburn Machine Replacement

By Kevin Breeze from Tura Beach NSW Australia
(Customer's Reviews) Saturday, November 10, 2012

I had to replace the factory machines on a Washburn Mandolin as they were very hard to tune and after a considerable effort getting them in tune they would quickly slip out again. The answer was the Grover tuning machines. They tune up fast and stay in tune much longer. I only had to drill two holes. They look great and you can feel the quality. I'd recommend these over your common factory machines any day.

tuner I've used

By Dr. Michael D Mortensen DC from Fort Bragg, ca. 95437
(Customer's Reviews) Friday, September 21, 2012

they very good and work really nice and look good too!

Grover F-style mandolin tuners

By Doc Rock from Calgary
(Customer's Reviews) Friday, January 13, 2012

These are very smooth tuners, but beware in the installation thereof! The bushing recess is advertised as 11/32". I used a twist drill in reverse to ream the recess, and the bushing was too loose. I then used a 21/64" twist drill, and got the perfect fit. A word to the wise. I managed to build up the loose fit by gluing a ring of paper inside the too-large hole, but if you use a bit, use a 21/64" run in reverse to prevent its digging in.


By Wilmer Gingerich from Jamesport MO
(Customer's Reviews) Saturday, December 17, 2011

My Collings F5 went from a tuning aggravation to a dream!

A nice upgrade

By Fran+ºois from Toronto, Canada
(Customer's Reviews) Wednesday, September 28, 2011

These tuning machines were a direct replacement to the stock machines on my MK mandolin, which uses 'worm over string post' tuners, except for a few screw holes. The only drawback is that the tuners work the opposite way compared to the originals, i.e. clockwise to tune up on the lower strings side.

I guess Grover uses the same parts for 'worm over' and 'worm under' models, and the worms are made primarily for the 'worm under' model. Nevertheless the tuners are of top quality, with a smooth and precise action. For a mandolin this is very important due to the high-tension of the strings and micro-metric tuning requirement. Thanks to Stew-Mac for the fast shipping!

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