Power, Feeding & Durability

• Triple feed (unison feed) system – bottom feed, needle feed and walking foot all work together, so every layer moves in sync, preventing slippage and puckering even on bulky or sticky materials.
• Double needle lockstitch – sew two perfectly parallel rows in a single pass for both decorative and structural seams.
• Japanese hooks and shafts – high-precision drive parts designed for smooth running, long life and consistent stitch quality.
• Heavy-duty build: this machine is a true “workhorse”, made for long shifts and demanding upholstery shops, not hobby use.
• Assembled with a servo motor, providing strong torque, quieter operation and fine speed control for detailed work.

Materials & Applications

The SPEEDWAY SW-4420N is designed for medium to heavy-weight materials, typical in professional upholstery and leather shops:

1. Furniture upholstery – sofas, armchairs, cushions, decorative panels and borders.
2. Automotive interiors – seat covers, door panels, armrests, headrests and trim.
3. Marine & RV upholstery – boat seats, cockpit cushions, backs and interior panels.
4. Leather & synthetic leather – bags, gear, straps, moto seats, saddlery components.
5. Canvas & technical fabrics – heavy canvas, laminated textiles and coated fabrics used in covers, bags and industrial products.

When you need strong, clean twin-needle seams on tough materials, the SW-4420N is built to do that all day, every day.

Key Features

• Double needle heavy-duty lockstitch industrial machine
• Triple feed (unison feed) – walking foot + needle feed + bottom feed
• Uses Japanese hooks and shafts for durability and smooth performance
• Designed specifically for upholstery, leather and heavy textiles
• Different gauge sets available (various needle spacings to match your application: decorative, structural, close or wide spacing)
• Produces two parallel rows of stitching in one pass for extra strength and a high-end look
• Ideal for seat seams, decorative topstitching, quilted panels, bands and straps
• Servo motor included for quiet, energy-efficient operation and excellent speed control
• Heavy-duty construction for continuous professional use

Technical Specifications (typical configuration)

• Model: SPEEDWAY SW-4420N
• Machine Type: Double needle heavy-duty unison feed walking foot
• Feed System: Walking foot + needle feed + bottom feed (triple feed / unison feed)
• Hooks: Japanese vertical-axis hooks (double)
• Material Range: Medium to heavy-weight materials (upholstery fabrics, vinyl, leather, canvas, technical textiles)
• Max Sewing Speed: typically up to 2,000–2,500 stitches per minute (depending on material and setup)
• Max Stitch Length: up to 9 mm (forward and reverse, model-dependent)
• Needle Gauge: multiple gauge sets available (e.g. close, medium and wider spacings depending on order)
• Needle System: typically DPx17 / 135×17 (sizes approx. #18–#24 depending on material and thread)
• Presser Foot Lift:
• By hand: heavy-duty range
• By knee: up to approx. 16–20 mm (for bulky upholstery assemblies)
• Lubrication: Automatic / central lubrication system
• Motor: Energy-saving servo motor, 110V (or regional voltage as specified)

(Exact speed, gauge and setup may vary depending on how the machine is configured for the customer.)

What’s Included

• SPEEDWAY SW-4420N double needle heavy-duty walking foot machine head
• Servo motor, mounted and wired
• Industrial table & stand, fully assembled
• Built-in bobbin winder and thread stand
• Standard double-needle gauge set (additional gauges available separately), needles and basic accessory kit