Will this work for my 5mm Yamaha FS800?

Well, 5mm is 5mm. But Martins have recessed truss rods, meaning they're located further inside the soundhole. So the length of the wrench is ideal for reaching them. That said, if your Yamaha's truss rod hex is closer to the soundhole, this wrench may be too long to fit in it squarely, as the other side of the soundhole may interfere with it.

Will this fit a Martin d18 acoustic guitar

I would like to say yes, it should fit. It fits my custom Martin. I think there the same. I have read before that the D18 is a little deeper so you may need to go with a 51/2 or 6 inch long Allen. But I think 5mm is standard Martin.

I bought this as recommended, and it doesn't fit the martin lx1. which size should i get for the lx1?

You didn't specify if it's too big or too small, just that it doesn't fit. I'm assuming it's too big. Most Martin's take a 5mm wrench which this one is, or in some cases, a 4mm. If this one doesn't fit, try the 4mm.

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MusicNomad Premium Truss Rod Wrench 5mm for Martin Guitars (MN236)

Product ID: 202932578

Details

Brand
MusicNomad
Color
Blue
Item Package Quantity
1
Item Weight
1.7 Ounces
Material
Metal

✋Ergonomic handle grip

🔧5mm precision fit

⚙️Durable steel build

70.98 DT

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Description

🎸 Tune like a pro, feel the difference every strum!

MARTIN READY - Fits nearly all Martin guitars—join the elite circle of pros who trust it.
BUILT TO LAST - Premium steel construction for reliable, long-term tuning control.
PERFECT 5 MM FIT - Laser-etched size ensures you never guess, just adjust.
EFFORTLESS ACCESS - Ball-end design reaches tricky truss rods with ease.
COMFORT MEETS CONTROL - Ergonomic handle adds extra length for precision and comfort.

The MusicNomad Premium Truss Rod Wrench 5mm is a precision-engineered steel tool designed for nearly all Martin guitars. Featuring a laser-etched size, ergonomic handle, and ball-end design, it offers superior control and durability for effortless truss rod adjustments. Trusted by thousands, it’s a must-have for serious guitarists aiming for perfect neck relief.

Specifications

ASIN	B086WN2YWC
Best Sellers Rank	#1,743 in Musical Instruments ( See Top 100 in Musical Instruments ) #14 in Guitar Tools
Body Material	Steel
Color Name	Blue
Customer Reviews	4.8 4.8 out of 5 stars (1,336)
Date First Available	April 8, 2020
Item Weight	1.7 ounces
Item model number	MN236
Material Type	Metal
Product Dimensions	6.22 x 3.6 x 0.5 inches

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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70.98 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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