Zhejiang Nanyuan Sewing Equipment Co., Ltd. is one of the leading manufacturers and suppliers of 2 needle 4 thread overlock sewing machine in China, featured by quality products and low price. Welcome to buy bulk automatic sewing machines for sale here and get quotation from our factory. Customized orders are welcome.
M343D-FLY 2 Needle 4 Thread Overlock Sewing Machine
The M343D-FLY is a 2 needle 4 thread overlock sewing machine manufactured by Zhejiang Nanyuan Sewing Equipment Co., Ltd. under the registered Fly Butterfly brand. Engineered for home sewers, tailoring shops, and small garment studios, this 4-thread serger delivers professional-grade seam finishing on fabrics ranging from delicate silks to sturdy denims. Its standout white body with floral motifs and an array of red adjustment dials combines aesthetic appeal with practical functionality - a machine that looks as good as it sews. Clear threading guides printed directly on the machine body make setup intuitive, even for first-time overlock users.
Key Selling Points
4-Thread Professional Overlock
Unlike basic 3-thread sergers, the M343D-FLY uses a 2-needle 4-thread system that simultaneously trims, seams, and overcasts fabric edges in a single pass. The extra thread adds seam durability, making it suitable for stretch knits, woven fabrics, and multi-layer projects.
Beginner-Optimized Threading System
Full-color threading diagrams are printed directly on the machine body, eliminating the need to reference a separate manual. Color-coded thread paths guide users through each looper and needle - from unpacking to first stitch in under 10 minutes.
Wide Fabric Versatility
Engineered needle and presser foot system handles the full fabric spectrum: lightweight silks and chiffons for evening wear, medium-weight cottons and linens for everyday garments, and heavy denims and canvases for structured projects - all with consistent stitch quality.
Intuitive Red Dial Controls
Multiple red adjustment dials on the top panel control stitch length, stitch width, differential feed, and thread tension. Each dial is clearly labeled, making real-time adjustments simple during sewing without stopping to consult documentation.
Registered Fly Butterfly Brand
The Fly Butterfly trademark is a registered brand of Nanyuan, representing a dedicated line of consumer-oriented sewing machines designed for retail appeal, user experience, and brand recognition in international markets.
Stable Compact Chassis
A small footprint with a weighted, vibration-resistant base keeps the machine steady during high-speed overlocking. The compact dimensions fit comfortably on standard sewing tables and can be stored in cabinets when not in use.
Technical Specifications
| Parameter | Specification |
| Model Number | M343D-FLY |
| Brand | Fly Butterfly - Registered Trademark |
| Machine Type | 2 Needle 4 Thread Overlock Sewing Machine |
| Body Color | White with floral motifs |
| Thread Configuration | 2 needles + 2 loopers = 4 threads |
| Stitch Types | Overlock seam with simultaneous trim + seam + overcast |
| Suitable Fabrics | Silk, chiffon, cotton, linen, denim, canvas, knits, synthetics |
| Control Interface | Multiple red adjustment dials (top panel) |
| Threading System | Color-coded guides printed on machine body |
| Differential Feed | Adjustable (via dedicated dial) |
| Adjustable Parameters | Stitch length, stitch width, thread tension, differential feed |
| Chassis | Weighted anti-vibration base, compact footprint |
| Brand Owner | Zhejiang Nanyuan Sewing Equipment Co., Ltd. |
| Origin | Jinyun County, Lishui, Zhejiang, China |
Application Scenarios
| Scenario | Details |
| Garment Construction & Tailoring | Build complete garments with factory-quality overlocked seams. The 4-thread system is ideal for T-shirts, dresses, activewear, and lingerie - fabrics that require both stretch tolerance and seam strength. |
| Denim & Heavy Fabric Projects | Overlock raw edges on jeans, jackets, canvas bags, and upholstery panels. The sturdy needle system and adjustable differential feed prevent puckering on heavyweight materials while maintaining a clean, professional edge finish. |
| Home Décor & Soft Furnishings | Finish curtain hems, cushion covers, table linens, and bed sheets. The 4-thread overlock prevents fraying on woven fabrics and adds a decorative finished edge visible in high-end home textiles. |
| Stretch Knit & Sportswear | Sew yoga wear, swimwear, leggings, and baby clothes with seams that stretch without snapping. The 4-thread configuration adds built-in elasticity that moves with the fabric. |
| Small-Batch Production & Alterations | Tailors and alteration shops use the M343D-FLY for quick hemming, seam finishing, and edge overcasting on customer garments. Consistent output quality meets professional service expectations. |
The Fly Butterfly Brand Difference
Fly Butterfly is a registered brand line from Zhejiang Nanyuan Sewing Equipment Co., Ltd., created to serve the consumer and home-sewing market with machines that balance style, simplicity, and professional performance. Unlike industrial-class machines designed for factory floors, Fly Butterfly products are tuned for the home studio - quieter operation, intuitive controls, and retail-ready packaging.
Registered Trademark
Fly Butterfly is a legally registered trademark, giving distributors and retailers brand protection and recognition in their local markets.
Consumer-First Design
Every Fly Butterfly machine, including the M343D-FLY, is designed with the home user in mind: clear controls, simplified threading, and aesthetics that appeal to modern sewing enthusiasts.
Retail-Ready Packaging
Colorful retail boxes with product imagery and feature highlights are designed to sell on store shelves and in e-commerce listings without additional repackaging.
Why Choose Nanyuan as Your Supplier
Over 20 years of sewing machine R&D and manufacturing experience. Factory-direct pricing with no intermediary markups.
6 utility model patents protect the proprietary overlock feed and looper mechanisms that deliver consistent stitch quality across all fabric types.
Triple ISO certification (9001/14001/45001) satisfies the compliance documentation required by importers in Europe, North America, the Middle East, and Southeast Asia.
Accepts wholesale orders and OEM/ODM customization. Contact our sales team for volume pricing and custom branding options.
FAQ
Q: What brand is the M343D-FLY?
A: The M343D-FLY is manufactured under the Fly Butterfly brand, a registered trademark of Zhejiang Nanyuan Sewing Equipment Co., Ltd. Fly Butterfly is Nanyuan's dedicated consumer sewing machine line.
Q: How is the 4-thread overlock different from a 3-thread?
A: A 4-thread overlock uses two needles and two loopers. This adds a second row of stitching to the seam, making it significantly stronger and more elastic than a 3-thread finish. It is the preferred configuration for garment construction, activewear, and any project where seam durability matters.
Q: Is the threading process really beginner-friendly?
A: Yes. The M343D-FLY features full-color threading diagrams printed directly on the machine body. Color-coded thread paths guide you through each looper and needle step by step. Most first-time users complete threading in under 10 minutes without external help.
Q: How do I adjust stitch length, width, and tension?
A: All adjustments are made through the red dials on the top panel. Each dial is clearly labeled for its function - stitch length, stitch width, differential feed, and thread tension. Simply turn the dial to the desired setting; no tools required.
Q: What fabrics can this machine handle?
A: The M343D-FLY works across the full fabric spectrum: delicate silks, chiffons, and satins for formal wear; medium cottons and linens for daily garments; and heavy denims, canvases, and upholstery fabrics for structured projects. Adjust tension and differential feed per fabric type.
Q: How large is the machine and where can I place it?
A: The M343D-FLY has a compact footprint with a weighted anti-vibration base. It fits comfortably on standard sewing tables, desks, and craft room cabinets. When not in use, it can be stored on a shelf or in a closet.
Q: What warranty and support is included?
A: The machine is covered by a 12-month warranty from delivery date; the motor is covered for 6 months. Spare parts are dispatched within 48 hours of a valid warranty claim. Exclusions: unauthorized modifications, incorrect voltage usage, and normal wear-and-tear.
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