Portable heavy-duty machines
Sailrite
Ultrafeed LS-1
Sailrite Ultrafeed LSZ-1
Photo: Sailrite
Portable heavy-duty machines
F5 · Professional
Sailrite Ultrafeed LSZ-1
Price
Not available
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Data from official source
The Ultrafeed LSZ-1 is Sailrite's heavy-duty portable machine for people sewing boat canvas, awnings and upholstery away from an industrial shop floor: a walking foot with oscillating shuttle, straight and zigzag stitch on the same body, and a dedicated WorkerB motor in place of the hand crank found on ordinary portables. It sews thread from Tex 30 to Tex 92 — heavy-duty thread for canvas and sail work, not dressmaking cotton.
A 34 mm needle bar stroke and straight stitch up to 6 mm let it handle multiple layers of coated fabric or light leather, while zigzag reaches 5 mm width for reinforcement and buttonholing. Lubrication is manual, as on many portables meant to be used away from a workshop — on a boat, in a van, on a folding table.
It's built for occasional heavy work, not continuous production: a top speed of 550 stitches per minute suits someone who travels with the machine, not a shop sewing in one spot all day.
01 · Verified data
Technical specifications
| Parameter | Value | Source |
|---|---|---|
| Power supply | 110 V / 50-60 Hz | manufacturer website |
| Maximum speed | 550 spm | Declared by the brand |
| Shuttle type | Oscillating | Declared by the brand |
| Maximum stitch length | 6 mm | Declared by the brand |
| Maximum stitch width | 5 mm | Declared by the brand |
| Minimum thread size (Tex) | 30 Tex | Declared by the brand |
| Maximum thread size (Tex) | 92 Tex | Declared by the brand |
| Motor power | 0.25 hp | Declared by the brand |
| Needle system | 135x16, 135x17 | Declared by the brand |
| Underarm space | 7" x 4.5" | Declared by the brand |
| Needle size range | #10–#22 | Declared by the brand |
| Lubrication | Manual | Declared by the brand |
| Feed type | Compound walking foot | Declared by the brand |
| Sold as | Complete set | Declared by the brand |
| Needle bar stroke | 34 mm | Declared by the brand |
02 · Summary
Pros and cons
In favour
- The walking foot moves multiple layers of coated fabric without puckering or slipping
- Sews thread up to Tex 92 — heavy-duty thread for boat canvas and sails, not dressmaking cotton
- The dedicated WorkerB motor replaces the hand crank found on ordinary portables source
- The 34 mm needle bar stroke is industrial-grade, not that of a domestic machine carried along
Worth knowing
- Lubrication is manual — it has to be checked and done by hand, unlike bench industrials with automatic lubrication
- Top speed is 550 stitches per minute — it can't keep pace with a production-line industrial
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