The SPEEDWAY SW7-4D is a 4-thread smart overlock machine built for high-speed, consistent seaming in professional apparel production. It runs plain seam and mock safety stitch configurations and shares the same smart automation platform as the SW7-5D — direct drive motor, automatic thread trimming, silent presser foot lifter, and a step motor system that automatically adjusts presser foot pressure to fabric thickness. The result is sustained output at up to 7,500 SPM with minimal manual intervention across varying fabric weights. Comes as a complete setup with table and stand included.
What's Included
- SPEEDWAY SW7-4D 4-thread smart overlock machine (ships assembled)
- Direct drive servo motor (integrated)
- Industrial table and stand
- Standard accessory kit
Key Features
- 4-thread plain seam and mock safety stitch — versatile configuration for standard seaming and decorative safety stitch appearance without a true chainstitch needle line
- Step motor system — automatically adjusts presser foot pressure to fabric thickness, eliminating manual adjustment when transitioning between fabric weights
- Automatic thread trimming — reduces cycle time and operator intervention on high-volume production runs
- Silent presser foot lifter — quieter, smoother operation during fabric positioning
- Direct drive motor — no belt, lower maintenance, quieter operation, and precise speed control
- 7,500 SPM maximum speed — high-volume sustained output for demanding production schedules
- Differential ratio 0.7–2.0 — handles stretch, woven, and layered fabrics without puckering or distortion
- Complete assembled setup — arrives ready to install and run with table and stand included
Ideal For
- High-volume garment production — fast, consistent 4-thread seaming with automated functions
- Variable fabric operations — automatic presser foot pressure adjustment reduces manual intervention across fabric weights
- Apparel manufacturing — plain seam and mock safety stitch cover primary seaming requirements
Video Tutorials
Machine Overview
How to Thread
Technical Specifications
| Model | SPEEDWAY SW7-4D |
| Machine Type | 4-Thread Smart Overlock (Plain Seam, Mock Safety Stitch) |
| Needle System | B27 / DCx27, sizes #9–#18 |
| Number of Needles | 2 |
| Number of Threads | 4 |
| Needle Spacing | 2 mm |
| Stitch Width | 2 mm × 4 mm |
| Stitch Length | 0.8–4.6 mm |
| Differential Ratio | 0.7–2.0 |
| Presser Foot Lift | 10 mm |
| Max Sewing Speed | 7,500 SPM |
| Auto Functions | Thread trimmer, presser foot lift, pressure adjustment |
| Motor | Direct Drive Servo Motor |
| Drive Type | Direct Drive |
| Setup | Complete — table and stand included |
