Crafter Blue 20mm MX03-117 FKM Rubber Strap Cut to Size
Product Overview
The Crafter Blue MX03-117 FKM Rubber Strap is purpose-built for Seiko Alpinist enthusiasts and owners of select Hamilton Khaki Field watches who demand a replacement band that matches the quality and character of their timepiece. Designed with meticulous attention to fit and function, this 20mm strap delivers a seamless, integrated look that eliminates the common gap between case and band found in generic alternatives. Whether you’re scaling mountain ridges or navigating daily commutes, the MX03-117 offers reliable performance, all-day comfort, and a refined aesthetic that enhances your watch’s original design.
Crafted from high-grade FKM rubber, this strap resists degradation from UV exposure, sweat, oils, dust, and harsh chemicals—ensuring it holds up under real-world conditions without fading, cracking, or losing flexibility. Unlike standard rubber or silicone bands, FKM material maintains its shape and texture over time, making it ideal for active lifestyles and long-term wear. The inclusion of custom-machined 316L stainless steel end links ensures a precise, gap-free connection to your watch case, creating a factory-finished appearance that elevates the overall look of your timepiece.
Key Features
- Premium FKM Rubber Construction: Engineered for resilience, this material withstands environmental stressors including UV rays, moisture, and chemical exposure, ensuring long-term durability and consistent appearance.
- Custom-Fit 316L Stainless Steel End Links: Precision-machined to match the exact curvature of Alpinist and compatible Hamilton cases, these end links provide a flush, OEM-style fit with no visible gaps or misalignment.
- Cut-to-Size Design: The strap can be trimmed to fit wrist circumferences from 5.9 to 8.2 inches (152mm–210mm), allowing for a personalized, secure fit that enhances comfort during extended wear.
- Quick-Release Spring Bars Included: Tool-free installation is supported by included replacement spring bars, enabling fast and easy strap changes without the need for specialized tools.
- Multiple Color Options: Available in Black, Blue, Orange, Green, Grey, and Desert Yellow, giving you the flexibility to match your watch dial, personal style, or activity.
- Brushed 316L Stainless Steel Clasp: Corrosion-resistant and finished with a subtle brushed texture, the clasp complements the watch case and end links while providing reliable security.
Technical Specifications
- Lug width: 20mm
- Buckle size: 18mm
- End link type: 316L Brushed stainless steel
- Clasp type: 316L Brushed stainless steel clasp
- Wrist size range: 5.9 inches to 8.2 inches (152 mm to 210 mm)
- Overall length: 100mm + 100mm
- Thickness: Approximately 5mm at the lug end, tapering to 3mm at the clasp
- Color options: Black, Blue, Orange, Green, Grey, Desert Yellow
- Lug end style: Stainless Steel End links
- Replacement spring bars: Included
Benefits & Use Cases
The MX03-117 is designed for watch wearers who value both form and function. Its FKM rubber construction makes it ideal for outdoor adventures, travel, and daily urban use, standing up to sweat, dirt, and weather without compromising comfort. The cut-to-size feature ensures a tailored fit for a wide range of wrist sizes, eliminating excess bulk and improving wearability during physical activity or long days on the wrist.
The precision-machined 316L stainless steel end links are a standout feature, engineered to follow the exact contours of the Seiko Alpinist case and compatible Hamilton Khaki Field models. This creates a seamless transition from case to strap, replicating the integrated look of factory-original bands. The result is a cohesive, professional appearance that enhances the watch’s design rather than detracting from it.
Installation is straightforward thanks to the included quick-release spring bars, allowing users to swap straps in seconds without tools. This makes the MX03-117 a practical choice for those who like to rotate bands based on occasion, outfit, or activity. Whether you’re dressing up for an event or heading out on a hike, this strap adapts to your needs with ease.
Compatible models include the full Seiko Alpinist Classic Series (SARB017, SARB013, SARB015, SPB117, SPB119, SPB121, SPB123, SPB197, SPB199, SPB201, SPB507, SPB503, SPB505), Alpinist GMT (SPB377, SPB379), Baby Alpinist (SPB155, SPB157, SPB159), and Hamilton Khaki Field references H70455133, H70455553, H70455160, H70455540, H70455733, H70405130, and H70405710.
Important Notes
Before purchasing, confirm your watch’s reference number to ensure compatibility with the MX03-117. While the strap is designed for a precise fit, users should carefully measure their wrist and follow trimming instructions to avoid cutting too much material. The included spring bars support quick release but should be handled gently during installation to prevent scratching the watch case. To maintain the strap’s appearance and performance, clean it regularly with mild soap and water. Avoid prolonged exposure to extreme heat or petroleum-based products. This product is manufactured by CRAFTER BLUE and was first made available on December 15, 2025. Warranty information can be found through the manufacturer’s official support page.
