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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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 design

🔧5mm precision fit

🛠️durable steel build

€ 19.83

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Tune like a pro, adjust with confidence!

BUILT TO LAST - Crafted from premium steel for unmatched durability and long-term reliability in your guitar maintenance toolkit.
TRUSTED BY PROS - Ranked #33 in Guitar Tools with a stellar 4.8-star rating from over 1,300 users—join the community of serious musicians who rely on MusicNomad.
COMFORT MEETS CONTROL - Ergonomic handle extends length and grip comfort, giving you superior control without hand fatigue.
PRECISION PERFECT FIT - Specifically engineered for all Martin guitars except select models, ensuring flawless truss rod adjustments every time.
LASER ETCHED SIZE MARKING - Never second-guess your tool size with a permanent, easy-to-read 5mm laser-etched marking on the metal.

The MusicNomad Premium Truss Rod Wrench (5mm) is a precision-crafted steel tool designed for nearly all Martin guitars. Featuring an ergonomic handle for enhanced comfort and control, plus a laser-etched size marking for quick identification, it’s a must-have for guitarists seeking reliable, professional-grade maintenance gear.

Specifications

ASIN	B086WN2YWC
Best Sellers Rank	#2,380 in Musical Instruments ( See Top 100 in Musical Instruments ) #33 in Guitar Tools
Body Material	Steel
Color Name	Blue
Customer Reviews	4.8 4.8 out of 5 stars (1,324)
Date First Available	April 8, 2020
Is Discontinued By Manufacturer	No
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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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€ 19.83

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

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

2 weeks ago

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Excellent communication throughout the order process. Product is perfect.

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