















GK-502SP 3R/3L Guitar Tuning Pegs Lock String Tuner
SKU:Guitar Tuners-GK-502CSP-3R3L
PRODUCT DESCRIPTION
Upgrade your electric guitar with Guyker GK-502SP locking guitar tuners designed for smooth 1:18 tuning control, faster string changes, and stable string handling. This 3R+3L tuning peg set is suitable for compatible electric guitar replacement, repair, and custom build projects where the peg hole size, tuner layout, and mounting footprint match the size chart.
Key Features
- Locking tuner design: Helps make restringing faster and can reduce string slippage during regular playing.
- 1:18 gear ratio: Provides smooth and precise tuning adjustment for setup work, recording, and everyday playing.
- 3R+3L layout: Designed for guitar headstocks using three right-side and three left-side tuning machines.
- Screw-in hex head bushing: Built for secure installation on compatible headstocks.
- Multiple finish options: Available in Chrome, Black, Gold, Nickel, and Rainbow depending on the selected variant.
- Fitment reminder: Please verify your peg hole size, tuner layout, post diameter, string thru hole height, bushing size, and mounting screw position before ordering.
Technical Specifications
| SKU / Model | GK-502SP |
| Product Type | Locking Guitar Tuners / Guitar Machine Heads |
| Suitable For | Electric guitars with compatible 10 mm tuner holes and matching 3R+3L layout |
| Layout | 3R+3L |
| Gear Ratio | 1:18 |
| Peg Hole Requirement | 10 mm |
| Weight per pc / per set | 46.5 g / 348 g |
| String Post Overall Height | 25.5 mm |
| String Post Diameter | 6 mm |
| Max. String Gauge | 1.8 mm |
| String Thru Hole Center Height | 21 mm |
| Bushing Type | Screw-in hex head |
| Bushing Reference | Ø15.5 mm outer reference, Ø8.1 mm inner reference, and 9.3 mm height shown in size chart |
| Housing Reference | 41.4 mm height reference shown in size chart |
| Button Reference | 23.86 mm width and 17.1 mm height shown in size chart |
| Mounting Screw Reference | ST2.2 screw, 8 mm length shown in size chart |
| Finish Options | Chrome, Black, Gold, Nickel, Rainbow |
| Package Includes | 6 x guitar machine heads, 6 x threaded bushings, 6 x mounting screws, 6 x ferrules |
Compatibility Notes
Important: This tuner set is suitable for electric guitars with compatible 10 mm headstock holes and a matching 3R+3L tuner layout. Please compare the size chart with your original tuners before ordering. Check the peg hole size, post diameter, bushing dimensions, string thru hole height, tuner footprint, and mounting screw position. Minor modification may be required depending on the guitar model, production year, or existing hardware.
Package Includes
- 6 x guitar machine heads
- 6 x threaded bushings
- 6 x mounting screws
- 6 x ferrules
Installation Note
Before installation: Do not force the tuner posts or bushings into incompatible headstock holes. Align the tuner body and mounting screw holes carefully before tightening the screws.
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Size Reference
Important: Please refer to the size chart below and compare all dimensions with your original part before ordering.

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FAQS
Do you class a reverse headstock guitar as a left hand guitar?
How do I determine the right size/fit for a specific accessory?
Can you provide more details about the materials used in your products?
At Guyker, we prioritize the use of high-quality materials to ensure the durability and performance of our products. While the specific materials used may vary depending on the accessory, we commonly utilize materials such as:
■ Metals: We often use materials like stainless steel, aluminum, and brass for hardware, bridges, and other metal components.
■ Plastics: Certain accessories may incorporate durable and impact-resistant plastics such as ABS or polycarbonate for knobs, pickguards, and other components.
■ Woods: Some accessories, like guitar knobs or picks, may be made from various types of wood, including rosewood, ebony, or maple.
For more detailed information about the materials used in a specific product, we recommend reviewing the product descriptions or reaching out to our customer support team at [support@guyker.com] for further clarification.
Do you offer international shipping?
Yes, we offer international shipping to customers worldwide. When placing your order, please ensure that you provide accurate international shipping information, including your complete address and contact details.
Please note that international shipping may be subject to customs duties, taxes, and additional fees imposed by the destination country. These charges are the responsibility of the recipient and may vary depending on the country's customs policies.
What is your process for returning or exchanging a product?
To initiate a return or exchange, please follow these steps:
■ Contact our customer support team at [support@guyker.com] or visit our website's Returns/Exchanges page.
■ Provide your order details and the reason for the return or exchange.
■ Our customer support team will guide you through the process and provide you with a return/exchange authorization if applicable.
■ Follow the instructions provided, including packaging the product securely and attaching the necessary labels or documentation.
■ Ship the product back to us using a traceable and insured shipping method.
■ Once we receive the returned product and verify its condition, we will process the return or exchange accordingly.
Can I return or exchange a product if it's been used?
In most cases, products that have been used or show signs of wear may not be eligible for return or exchange unless there is a defect or error on our part. We recommend reviewing our specific return/exchange policy or contacting our customer support team at [support@guyker.com] to determine the eligibility of your particular product.
Do I need to cover the return shipping costs?
The responsibility for return shipping costs may vary depending on the reason for the return or exchange. In some cases, such as if the product is defective or if we made an error, we will provide a prepaid shipping label or reimburse your return shipping costs. However, if the return or exchange is due to a change of mind or a non-defective product, you may be responsible for the return shipping costs. We recommend reviewing our return/exchange policy or contacting our customer support team at [support@guyker.com] for specific details regarding return shipping costs.

GK-502SP 3R/3L Guitar Tuning Pegs Lock String Tuner
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