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SKU:Guitar Tuners-GK-501D7CSP-3R3L
PRODUCT DESCRIPTION
Upgrade your guitar with GK-501D7SP locking tuning machines designed for faster string changes and precise tuning adjustment. With a 1:18 gear ratio, 10 mm peg hole requirement, and multiple layout options, these tuners are suitable for many electric guitar repair, replacement, and custom build projects.
Key Features
- Locking tuner design: Locking posts help make string changes faster and can reduce string slippage during tuning.
- 1:18 gear ratio: Provides smooth and precise tuning adjustment for setup and performance reliability.
- Multiple layout options: Available in 3R3L, 6R, 6L, 1R, and 1L options depending on the selected variant.
- Fitment reminder: Please check the 10 mm peg hole requirement, string post diameter, post height, and mounting screw position before ordering.
Technical Specifications
| SKU / Model | GK-501D7SP |
| Current Variant SKU Reference | Guitar Tuners-GK-501D7CSP-1R |
| Product Type | Locking Guitar Tuning Machines |
| Suitable For | Many electric guitars with compatible 10 mm headstock holes |
| Layout Options | 3R3L, 6R, 6L, 1R, 1L |
| Gear Ratio | 1:18 |
| Peg Hole Requirement | 10 mm |
| Weight per pc / per set | 37 g / 222 g |
| String Post Overall Height | 23 mm |
| String Post Diameter | 6 mm |
| Max. String Gauge | 1.8 mm |
| String Thru Hole Center Height | 28.5 mm |
| Bushing Type | Screw-in hex head |
| Finish Options | Chrome, Gold, Black |
| Material | Not provided |
Compatibility Notes
Important: These locking tuning machines are designed for many guitars with modern 10 mm headstock holes. Please confirm your guitar’s peg hole diameter, post height, string post diameter, and mounting screw position before installation. Guitar models may vary by production year, factory, and region, and minor modification may be required.
Package Includes
- Package quantity varies depending on the selected layout option.
- 3R3L option: 3 x right-side and 3 x left-side locking guitar tuning machines, 6 x threaded bushings, 6 x mounting screws, and 6 x ferrules.
- 6R option: 6 x right-side locking guitar tuning machines, 6 x threaded bushings, 6 x mounting screws, and 6 x ferrules.
- 6L option: 6 x left-side locking guitar tuning machines, 6 x threaded bushings, 6 x mounting screws, and 6 x ferrules.
- 1R option: 1 x right-side locking guitar tuning machine. Please confirm the exact included hardware before upload.
- 1L option: 1 x left-side locking guitar tuning machine. Please confirm the exact included hardware before upload.
Installation Note
Before installation: Compare the tuner dimensions with your original tuning machines. Do not force-fit the tuner if the peg hole, bushing, or screw position does not match your guitar.
Video Show
Size Reference
Important: Please refer to the size chart below and compare all dimensions with your original part before ordering.

VIDEO
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-501D7SP Locking Electric Guitar Machine Heads
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