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SKU:GK-501D7SP-BK/GD-6R
PRODUCT DESCRIPTION
Upgrade your guitar tuning system with Guyker GK-501D7SP 1:18 locking electric guitar machine heads. Designed for tuning stability, smooth adjustment, and secure string locking, this tuner set is suitable for electric guitar replacement and upgrade projects with matching specifications.
Key Features
- Locking tuner design: Helps secure the string at the post for improved tuning stability and easier string changes.
- 1:18 gear ratio: Provides smooth and precise tuning adjustment for electric guitar setup work.
- Screw-in hex head bushing: Designed with a screw-in hex head bushing structure for secure installation.
- Multiple configuration options: Available in 6R, 6L, and 3R+3L packaging options for different headstock layouts.
- Two finish options: Available in Black + Gold and Blue + Chrome finishes.
- Fitment reminder: Please confirm your peg hole size, string post requirements, and tuner layout before ordering.
Technical Specifications
| SKU / Model | GK-501D7SP Series |
| Product Type | Locking Tuner |
| Gear Ratio | 1:18 |
| Bushing Type | Screw-in Hex Head |
| Weight | 37 g per pc / 222 g per set |
| Peg Hole Requirement | Ø9.8 mm |
| String Post Diameter | Ø6 mm |
| Max String Gauge | 1.8 mm |
| Color / Finish Options | Black + Gold, Blue + Chrome |
| Packaging Options | 6R, 6L, 3R+3L |
Size Reference
| Peg Hole Requirement | Ø9.8 mm |
| String Post Diameter | Ø6 mm |
| Bushing Length | 12.1 mm |
| Bushing Inner Diameter | Ø6.1 mm |
| Washer Outer Diameter | Ø15 mm |
| Washer Inner Diameter | Ø8.2 mm |
| Button Length | 18.6 mm |
| Button Width | 13.9 mm |
| Measurement Tolerance | ±1 mm |
Compatibility Notes
Important: Please confirm your guitar’s peg hole size, tuner layout, string post requirements, and mounting specifications before ordering. Installation requirements may vary by instrument model and headstock design.
Package Includes
- 6 x guitar machine heads
- 6 x threaded bushings
- 6 x mounting screws
- 6 x ferrules
Installation Note
Before installation: Professional installation is recommended. Always compare the new machine heads with your original tuners to confirm proper fitment before drilling, tightening, or mounting.

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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.

Guyker GK-501D7SP BK/GD Locking Electric Guitar Machine Heads
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