B21, China Town Mall, Midrand
WK747 4-Thread Overlock Sewing Machine
- Section : Machinery
- Category : Sewing Machines
- SKU : 1600192691017
747 High-speed overlock sewing machine features:
1.Suitable for overlocking and overedging workpiece of light and medium-thinckness materials.
2.Low sewing tension,neat and beautiful stitches even running at high speed.
3.Auto lubricaing equipment with stable runninh and excellent performance.
| Model | Stitch Length | Stitch width | Ratio | Sewing speed | C.B.M. | Weight |
| WK737 | 4mm | 3.6mm | 0.7-2 | 6000r.p.m | 470*330*480 | 34/32 |
| WK747 | 4mm | 3.6mm | 0.7-2 | 6500r.p.m | 470*330*480 | 34/32 |
| WK757 | 5mm | 3.6mm | 0.7-2 | 5500r.p.m | 470*330*480 | 34/32 |
- Shipping Timeframes: All orders are processed within 2-5 business days (excluding weekends and holidays). After your order has been processed, the estimated delivery time is before 03 Feb, 2026, depending on customs, Please note that due to high demand, some items may experience longer shipping times, which will be communicated at order confirmation email.
- Order Processing Time: Please allow 2-5 business days for us to process your order before it is shipped . Orders placed after 16:00 on Fridays, or during weekends and public holidays, will begin processing on the next business day. Processing times may be extended during peak seasons or sales events.
- Manufacturing Time: Some products needs manufacturing time, the manufacturing process will take approximately 10-30 business days depending on the product. This timeframe may vary depending on the complexity of the product and current demand. but this will be communicated with you during order confirmation.
- Returns and Exchanges: We offer a 30-day return policy for most items. If you are not completely satisfied with your purchase, you may return it within 30 days of receipt for a refund or exchange. Items must be unused, in their original packaging, and accompanied by proof of purchase. Return shipping costs are the responsibility of the customer, unless the item was damaged or defective upon arrival.
1. What is the WK747 4-Thread Overlock Sewing Machine designed for?
The WK747 is a high-speed 4-thread overlock machine designed for overlocking and overedging workpieces made from light to medium-thickness materials.
2. What are the key performance features of the WK747?
Key features include low sewing tension for neat stitches at high speed, automatic lubrication for stable running, and excellent overall performance for finishing edges.
3. What are the main technical specifications of the WK747?
Stitch length: 4 mm; stitch width: 3.6 mm; differential feed ratio range: 0.7–2 (as listed); maximum sewing speed: 6500 rpm; package dimensions: 470 × 330 × 480 mm; weight: listed as 34/32 (as provided).
4. What does '4-thread' mean and what stitch types can I make?
'4-thread' indicates the machine uses four threads to form a secure overlock stitch, commonly used for overlocking and overedging seams and finishing raw edges with stretch and durability.
5. Which fabrics are suitable for this machine?
The WK747 is suitable for light to medium-weight fabrics, including knits and woven materials typical of apparel and home textiles that require neat edge finishing.
6. How fast can the WK747 sew?
The machine's maximum sewing speed is specified at 6500 revolutions per minute (rpm), enabling high-speed production when properly adjusted.
7. What does the automatic lubrication do and how often should I service it?
The auto-lubrication system supplies oil to critical moving parts for smoother, more stable running. Regular checks and refilling of the oil reservoir per the manufacturer’s schedule (typically daily or weekly depending on use) and periodic full servicing are recommended.
8. How can I achieve neat, balanced stitches at high speed?
Ensure correct threading of loopers and needles, set appropriate thread tensions, use the right needle and thread for the fabric, keep the machine clean and well-lubricated, and perform a few test runs before production.
9. What are common troubleshooting steps for skipped stitches or loose loops?
Check and re-thread the machine (needles and loopers), replace bent or worn needles, verify thread tension settings, clean lint from feed and loopers, ensure proper lubrication, and confirm the correct needle size and type for the fabric.
10. How do I adjust stitch length and stitch width?
Stitch length is set via the machine’s stitch-length control (up to 4 mm for WK747). Stitch width is determined by the presser foot position and fabric edge guide; consult the machine manual for exact adjustment instructions.
11. What maintenance tasks should I perform regularly?
Regular maintenance includes cleaning lint and thread debris, checking/ refilling the lubricant reservoir, inspecting and replacing needles, checking tensions and threading, and having periodic professional servicing for timing and internal adjustments.
12. What are the physical/package dimensions and weight?
The listed package dimensions are 470 × 330 × 480 mm. The weight is provided as 34/32 (as listed); verify with the seller whether this refers to net/gross weight.
13. Are accessories or spare parts included, and where can I get them?
Included accessories may vary by seller or package. For specific included items and genuine spare parts (needles, loopers, presser feet, etc.), contact the seller or manufacturer directly.
14. How do I get setup help or a user manual for the WK747?
Request the user manual and setup instructions from your retailer or the manufacturer. Many suppliers provide PDF manuals, threading diagrams, and setup videos on request or via their website.
15. Who should I contact for warranty, repairs or technical support?
Contact the seller or the machine manufacturer for warranty registration, authorized service centers, and technical support. Keep your purchase records and serial number available when you call.
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