The looper (part #4039) is the part that actually makes the stitch on a blindstitch blind hemmer. As the curved needle passes through the fold of the fabric, the looper swings across and picks up the needle loop to form the single-thread chainstitch that holds an invisible hem. Every stitch the machine makes passes across this one component, which makes it a wear part: once the point dulls or the loop-taking surface wears, the machine starts skipping stitches, dropping the chain, or leaving an uneven hem — symptoms operators often chase through tension and needle depth before realizing the looper is the cause.
This is a genuine original SPEEDWAY part, manufactured in Taiwan — not a generic aftermarket copy. Part #4039 is the standard looper across the entire 101-class blindstitch platform, so it drops directly into a wide range of portable and industrial blind hemmers from multiple brands without modification.
Machine Compatibility — Available at Supra Sewing
- SPEEDWAY SW-101 — Industrial blindstitch blind hemmer with convertible swing arm
- SPEEDWAY SW 500e — Portable blindstitch blind hemmer
- CONSEW CM-101-1 — Single needle industrial blindstitch machine
Speedway Machine Compatibility
- SPEEDWAY SW-101
- SPEEDWAY SW 500e
Other Compatible Brands
- CONSEW — 75T, CM-101, CM-101-1, 221, 222, 250, 251
- CHANDLER — CM101 (101)
- TREASURE — BS-100, BS-101
- TONY — H101M
- LEWIS — C17
- YAMATA — CM-500
- ZOJE — ZJ-500
Cross-Reference Part Numbers
- 4039
- 101M
- CM500
- BS101 looper
Technical Specifications
| Brand | SPEEDWAY |
| Part Number | 4039 |
| Part Type | Looper |
| Machine Type | Blindstitch / Blind Hemmer |
| Stitch Formed | Single-thread chainstitch (blind hem) |
| Machine Class | 101-class blindstitch platform |
| Origin | Made in Taiwan |
| Condition | New — Genuine Original |
Ideal For
- Correcting skipped stitches and dropped chain on a blindstitch hemmer
- Scheduled preventive maintenance on production blind hemmers
- Alteration shops and tailoring workrooms running daily hemming
- Drapery and curtain workrooms hemming long panel runs
- Dry cleaners and garment repair counters offering same-day hemming
- Keeping a spare on the shelf so a hemming station never goes down mid-order
⚠️ Compatibility Notice: Always verify your machine model and subclass number before ordering. Part numbers and compatibility are provided as a reference only. Supra Sewing is not responsible for purchases made without confirming compatibility with your specific machine. All sales on replacement parts are final.
