Quick Overview
Changing strings shouldn't mean winding each one around the post five times and retuning for an hour. Locking tuners let you drop the string in, tighten a thumbwheel, and tune up in minutes. The Guyker GK-501D7SP is a 1:18 locking tuner set with a 10 mm fit, three finishes and layouts for most electric guitars, starting at $34.99 for a full set of six.
It's the most-reviewed locking tuner among the models featured on Guyker's homepage, with a 4.81-star average from 211 reviews, and 188 of them are five-star. This Guyker GK-501D7SP review covers fit, features, price, and the one check you must do before you order. It also covers how to get 10% off with code TRUNGPHAM.
Key Features of the Guyker GK-501D7SP Locking Tuners
Faster string changes. The locking post holds the string in place, which Guyker says can speed up changes and reduce string slippage while tuning.
Smooth, precise tuning. A 1:18 gear ratio means a fine adjustment for each turn of the button, which helps when you're setting up or tuning between songs.
Pick your layout. The listing offers 3R3L (three per side for Gibson-style headstocks), 6R (six in a row for right-handed guitars), 6L for left-handed guitars, or single right or left tuners if you only need one replacement.
Three finishes. Chrome, black or gold. They come with a logo disc on each tuner and screw-in hex bushings.
Everything in the box. The 3R3L, 6R and 6L options each include six tuners, six threaded bushings, six mounting screws and six ferrules, according to the listing.
| Spec | Guyker GK-501D7SP |
|---|---|
| Type | Locking guitar tuning machines |
| Gear ratio | 1:18 |
| Peg hole requirement | 10 mm |
| String post | 6 mm diameter, 23 mm overall height |
| Max string gauge | 1.8 mm |
| String thru-hole center height | 28.5 mm |
| Bushing | Screw-in hex head |
| Weight | 37 g per tuner / 222 g per set |
| Layouts | 3R3L, 6R, 6L, 1R, 1L |
| Finishes | Chrome, black, gold |
| Material | Not listed on the product page |
Will the Guyker GK-501D7SP Fit Your Guitar?
This is the one thing to check. Guyker says these tuners are made for many electric guitars with modern 10 mm headstock holes. Before you buy, measure your peg hole diameter, string post height and diameter, and mounting screw position, and compare them with the dimensions above.
Guyker also warns that guitar models vary by production year, factory and region, and that minor modification may be needed. Don't force-fit them if the peg hole, bushing or screw position doesn't match. If your guitar has smaller 9 mm holes, look at a model built for that size, such as the GK-55SP.
GK-501D7SP vs GK-07SP, GK102SP-A and GK-55SP
Guyker sells several locking tuners. Here's how four compare, using the specs on each listing:
| GK-501D7SP | GK-07SP | GK102SP-A | GK-55SP | |
|---|---|---|---|---|
| Chrome set price | $34.99 (3R3L, 6R, 6L) | $37.99 | $49.99 (3R+3L) | $31.49 (6R) |
| Gear ratio | 1:18 | 1:18 | 1:21 | 1:15 |
| Peg hole | 10 mm | 10 mm | 10 mm | 9 mm |
| Weight per set | 222 g | 305 g | n/a | 244.2 g |
| Notes | 4.81★, 211 reviews | 4.6★ on Guyker's homepage | Zinc alloy body | Aimed at ST and TL guitars |
Pick the GK-501D7SP for the lowest set price with a 1:18 ratio and a light 222 g set. Pick the GK102SP-A if you want a finer 1:21 ratio. Pick the GK-55SP if your headstock has 9 mm holes.
Who It's For
Perfect if you…
- change strings often and want fewer wraps and faster tuning
- want a drop-in upgrade for a guitar with 10 mm peg holes
- need a full set of six, or only a single replacement tuner
- like a gold, black or chrome finish to match your hardware
Skip it if…
- your guitar has non-standard peg holes or needs a very specific vintage-style tuner
- you want to confirm the exact material first (the listing doesn't state it)
- you aren't comfortable measuring and comparing hole sizes
Pricing: How Much Do the Guyker GK-501D7SP Tuners Cost?
Prices depend on finish and layout:
| Finish | Single tuner (1R or 1L) | Full set (3R3L, 6R or 6L) |
|---|---|---|
| Chrome | $7.49 | $34.99 |
| Black | $9.49 | $44.49 |
| Gold | $10.49 | $52.49 |
Use code TRUNGPHAM for 10% off. If it applies in full, a chrome set drops to about $31.49. Our link applies the code automatically at checkout, and the final price is shown before you pay.
What else to know:
- Shipping: free standard shipping on orders over $59.99, otherwise $5.99. Production takes 1–3 business days, then 7–14 business days of shipping in the first zone, which includes the US
- Returns: 30 days, in original condition with packaging. Return shipping is on you for personal-reason returns
- Exchanges: for quality issues or damage, report defects within 48 hours with photos
- Payment: the product page offers 4 interest-free payments
→ Check today's price on Guyker
Pros and Cons
Pros
- 4.81 stars from 211 reviews
- Locking posts speed up string changes
- 1:18 gear ratio for smooth tuning
- Chrome, black and gold options
- Full sets from $34.99, or single tuners from $7.49
- Bushings, screws and ferrules included
- Light at 222 g per set
- Free shipping over $59.99 and a 30-day return window
Cons
- Fits 10 mm peg holes only, and may need minor modification on some guitars
- Material isn't listed on the product page
- Shipping takes 7–14 business days after production
- A single chrome set pays $5.99 shipping, since it's under $59.99
- Personal-reason returns cost you the return shipping
FAQ
Are the Guyker GK-501D7SP tuners locking?
Yes. They use locking posts, which Guyker says help make string changes faster and can reduce string slippage.
What size peg hole do they need?
They need a 10 mm peg hole. Check your guitar's peg hole, post height and diameter, and screw position before ordering.
What's in the box?
The 3R3L, 6R and 6L options include six tuners, six threaded bushings, six mounting screws and six ferrules. The 1R and 1L options are a single tuner.
What layouts are available?
3R3L for three-per-side headstocks, 6R for right-handed in-line, 6L for left-handed in-line, and single 1R or 1L tuners.
How much do they cost?
A chrome set is $34.99, black is $44.49 and gold is $52.49. Single tuners are $7.49 to $10.49.
Is there a discount code for Guyker?
Yes. Code TRUNGPHAM gives 10% off, and our link applies it automatically at checkout.
Is the Guyker GK-501D7SP Worth It?
Yes, if your guitar has 10 mm peg holes, this is a low-cost locking tuner upgrade with a very strong track record. You get a 1:18 gear ratio, three finishes, all the hardware in the box, a 4.81-star average from 211 reviews and a 30-day return window. A chrome set is $34.99, and code TRUNGPHAM takes another 10% off. Get the Guyker GK-501D7SP →