JUKI Reinforced Plastic Bobbin 40244783 – Blue, Pack of 10
The JUKI Reinforced Plastic Bobbin 40244783 combines lightweight construction with excellent durability and strength. Made in Japan, this reinforced plastic bobbin is designed to help provide stable thread tension and consistent stitching performance.
Compared with conventional aluminium or iron bobbins, the lightweight plastic construction helps reduce running inertia, making it particularly useful for achieving stable stitching at different sewing speeds and on lightweight materials.
Key Benefits
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Lightweight Construction: Helps reduce running inertia and supports stable thread tension.
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Excellent Durability: Reinforced plastic provides strength and durability comparable to conventional aluminium and iron bobbins.
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Stable Thread Tension: Helps maintain consistent tension during sewing.
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Improved Stitch Quality: Supports beautiful and consistent stitches, especially on lightweight materials.
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Reduced Thread Bending: Helps reduce thread bending after intermittent sewing or thread trimming.
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Stable Start-Up Sewing: Helps reduce needle thread tension at the beginning of sewing.
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Made in Japan: Manufactured to JUKI quality standards.
Designed to Help Solve Common Sewing Issues
The JUKI reinforced plastic bobbin can help address common sewing issues such as:
- Difficulty adjusting thread tension.
- Irregular stitches when sewing lightweight materials.
- Unstable stitching at high and low sewing speeds.
- Loose stitches at the beginning of sewing.
Lightweight Design
Because reinforced plastic is lighter than aluminium and iron, the bobbin helps reduce running inertia and maintain stable thread tension. This can contribute to smoother operation and more consistent stitch formation.

High Durability
The reinforced plastic construction provides excellent durability. With minimal rubbing inside the bobbin case, the bobbin is designed to offer durability comparable to conventional aluminium and iron bobbins.

Reduced Running Inertia
The lightweight construction helps reduce thread bending that can occur after intermittent stitching or thread trimming. It also helps reduce the influence of the remaining bobbin thread amount on thread tension, contributing to more stable stitching performance.

Test conditions: Model used: LZ series at 3,000 rpm. Thread used: Resilon thread #60. Bobbin thread tension: 4g. Average values shown.
Product Details
| Brand |
JUKI |
| Product Type |
Reinforced Plastic Bobbin |
| Part No. |
40244783 |
| Colour |
Blue |
| Quantity |
10 Pieces |
| Country of Manufacture |
Japan |
Applicable Bobbin Part Numbers
| Application |
Blue (10 pcs.) |
Red (10 pcs.) |
Yellow (10 pcs.) |
| Lockstitch |
40244783 |
40245124 |
40245136 |
| 2-Fold Hook Lockstitch |
40244784 |
40245125 |
40245137 |
| 2-Needle |
40244785 |
40245126 |
40245138 |
| Zigzag / Buttonhole |
40244786 |
40245127 |
40245139 |
| Bar Tacking |
40244787 |
40245128 |
40245140 |
| Computer-Controlled Cycle Machine |
40244788 |
40245129 |
40245141 |