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: 341865325

Details

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

✋Ergonomic handle for control

🔧5mm precision fit

⚙️Durable steel build

$36.47

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Description

🎸 Tune Like a Pro, Adjust with Confidence!

BUILT TO LAST - Crafted from durable steel with a sleek black nickel finish for long-lasting, reliable adjustments.
BALL END DESIGN - Easily reaches deep truss rods inside the soundhole for hassle-free adjustments.
TRUSTED BY PROS - Top-rated tool with 4.8 stars from over 1,300 musicians who demand quality and precision.
ERGONOMIC COMFORT - Extended handle design offers superior grip and control, reducing hand fatigue during fine tuning.
PRECISION 5 MM FIT - Laser-etched size ensures perfect compatibility with most Martin guitars, avoiding guesswork every time.

The MusicNomad Premium 5mm Truss Rod Wrench is a precision-engineered tool designed specifically for most Martin guitars. Featuring a durable steel construction with a black nickel finish, an ergonomic handle for enhanced comfort, and a ball end design for deep soundhole access, it ensures effortless and accurate truss rod adjustments. Trusted by thousands of musicians, this wrench raises the standard in guitar maintenance tools.

Specifications

ASIN	B086WN2YWC
Batteries Included	No
Batteries Required	No
Best Sellers Rank	#4,885 in Musical Instruments ( See Top 100 in Musical Instruments ) #36 in Acoustic & Classical Guitar Parts
Brand	MusicNomad
Country of Origin	USA
Customer Reviews	4.8 4.8 out of 5 stars (1,316)
Date First Available	13 June 2012
Does it contain liquid?	No
Generic Name	Premium Truss Rod Wrench - 5mm for Martin Guitars
Item Dimensions LxWxH	15.8 x 9.1 x 1.3 Centimeters
Item Weight	48.1 g
Item model number	MN236
Manufacturer	MusicNomad Equipment Care
Material	Metal
Model	MN236
Model Name	Premium Truss Rod Wrench - 5mm for Martin Guitars
Net Quantity	1.0 Count
Number of items	1
Product Dimensions	15.8 x 9.14 x 1.27 cm; 48.19 g

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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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$36.47

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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