The SPEEDWAY SW6-4D is a 2-needle 4-thread direct drive overlock industrial sewing machine engineered for high-volume apparel production — T-shirts, knitwear, sportswear, blouses, dresses, uniforms, and light-to-medium woven garment seam finishing. Built around a fully integrated direct drive servo motor (no belt, no power loss, lower noise), the SW6-4D delivers a max sewing speed of 6,500 sti/min with smooth variable speed control.
The SW6-4D replaces the SPEEDWAY SW 747 e, which we no longer carry: it is also direct drive, uses the same B27 / DC×27 needles and sews faster (6,500 vs 5,500 sti/min). The DC×27 (#9–#18) needle system handles light-to-medium fabrics with industrial-weight threads, while the adjustable differential feed ratio of 0.7 - 2 prevents stretching or puckering on knits and lets the operator dial in clean gathers when needed.
Complete with industrial fully submerged table and stand. Assembled, calibrated and test-stitched in Miami before it ships.
What's Included
- SPEEDWAY SW6-4D Direct Drive 2-Needle 4-Thread Overlock Machine Head (Ships Assembled)
- Integrated Direct Drive Servo Motor
- Industrial Fully Submerged Table & Stand
- Standard Overlock Presser Foot Set
- DC×27 (#9–#18) Needles
- Standard Accessories Kit
- Operator's Manual
Key Features
- 2-needle 4-thread overlock (ISO 514 — mock safety stitch) — clean overedge seam finish
- Direct drive integrated servo motor — quieter, more responsive, lower energy use vs belt-driven setups
- 6,500 sti/min max sewing speed — high-throughput apparel production
- DC×27 (#9–#18) needle system — industrial standard, widely available across suppliers
- 6 mm overedging width — strong edge finishing on apparel seams
- Stitch length adjustable up to 4.5 mm
- Bottom differential feed ratio 0.7 - 2 — perfect stretch and gathering control on knits and stretch fabrics
- 2-row feed dog — clean, slip-free fabric movement
- 5.5 mm max presser foot lift — accommodates multi-layer assemblies
- Automatic lubrication — long service life, minimal maintenance
- Balanced looper/needle thread take-up — uniform stitch quality
- Low vibration and operator-friendly thread path
- Ships complete with fully submerged industrial table and stand, assembled and test-stitched in Miami
Ideal For
- T-shirt and knitwear manufacturing — sleeve hems, side seams, shoulder seams
- Activewear and sportswear production
- Uniforms and workwear
- Light to medium woven apparel
- Blouses, dresses, and shirts — clean overedge finishing
- Children's wear and underwear panels
- Tape attaching, elastic insertion, edge binding on knits
- General apparel safety-stitch seam finishing in high-volume production
- Shops replacing a SPEEDWAY SW 747 e or moving up from a belt-driven overlock
Video Tutorials
See It in Action
Specifications
| Brand | Speedway |
| Model | SW6-4D |
| Machine Type | 2-Needle Overlock, Direct Drive |
| Stitch Type | 4-Thread Mock Safety (ISO 514) |
| Number of Needles | 2 |
| Number of Threads | 4 |
| Needle System | DC×27 (#9–#18) |
| Max Sewing Speed | 6,500 sti/min |
| Max Stitch Length | 4.5 mm |
| Overedging Width | 6 mm |
| Feed Dog Rows | 2 |
| Differential Feed Ratio | 0.7 - 2 |
| Max Presser Foot Lift | 5.5 mm |
| Feed Type | Drop Feed |
| Construction | Flatbed |
| Lubrication | Automatic |
| Motor | Built-in Direct Drive Servo Motor |
| Voltage | 110V |
| Head Dimensions | 480 × 335 × 480 mm |
| Net Weight | 28 kg |
| Gross Weight | 35 kg |
| Material Weight Range | Light to Medium |
| Table Type | Fully Submerged Industrial Table |
| Includes | Complete Setup with Table and Stand |
| Assembly | Ships Assembled |
