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Product Description
Iroda S-53 is a 45° hot-knife tip designed for the Iroda/Pro-Iroda SolderPro 80 and SolderPro 90 (including 90K kit) series of cordless butane soldering irons.
Key Specifications
- Tip style: Hot knife, 45° blade
- Blade thickness: 0.5 mm
- Blade width: 6 mm
- Overall length: Approximately 24.5 mm
- Base/bottom diameter: Ø 9.8 mm (threads into the iron’s tip housing via the standard locking nut)
- Operating temperature (on compatible irons): Approximately 752 °F (400 °C)
- Equivalent power range of the host tools: 25–80 W
It is the standard hot-knife tip in the SolderPro 90K kit and is also used on the SolderPro 80.
Design and Construction
The S-53 is a catalytic hot-knife attachment typical of Iroda’s butane tools. It contains a delicate internal catalyst that converts the butane/air mixture into flameless heat at the blade. The thin 45° cutting edge is designed to melt and slice foam, plastic, rope, and similar materials rather than solder joints.
Like other tips in the series, it uses a quick-change design: the entire tip assembly unscrews via a knurled nut. Always allow the tip to cool fully before changing it, and avoid overtightening or mechanical shock, as the internal catalyst is fragile. Do not use the blade as a pry bar or cold cutter.
Compatibility
Primarily for:
- Iroda SolderPro 90 / 90K
- Iroda SolderPro 80 / 80K
It is not interchangeable with the S-05 hot-knife used on the smaller Pro-50/Pro-70 series, or with the PS-9 hot-knife used on Pro-100/110/120/150 tools. The Ø 9.8 mm base and overall form factor are specific to the 80/90 platform.
Typical Applications
The 6 mm, 0.5 mm-thick 45° blade is optimized for heated cutting and sealing rather than electrical soldering:
- Cutting and shaping foam
- Trimming plastic, rope, webbing, and synthetic line
- Heat-sealing cut edges to reduce fray
- Crafts, model making, upholstery, and packaging work
- Light field and workshop cutting where a portable butane tool is more convenient than a dedicated hot knife
It is not intended as a primary soldering tip. For precision electronics use the S-51 conical tip; for wiring and larger joints use the S-52 chisel tip.
Performance Notes
On the SolderPro 90, the tip reaches working temperature in about 17 seconds. Heat output is adjustable via the iron’s gas control lever (mid-setting is typically recommended). Runtime of the iron itself is up to about 53 minutes per fill on mid setting, depending on gas quality and conditions.
Proper care significantly extends tip life:
- Let the blade heat fully before cutting.
- Wipe residue off the hot edge rather than scraping it cold.
- Avoid forcing the blade through thick or abrasive materials.
- Do not run the tip dry for extended periods or subject it to mechanical impact.
- Keep the catalyst assembly free of melted plastic buildup.
Related Tips in the Same Series
The SolderPro 80/90 platform uses the S-5x family:
- S-51 — 1 mm conical (precision soldering)
- S-52 — 2.4 mm chisel
- S-53 — Hot-knife (45°)
- S-54 — Hot-air blower
These share the same Ø 9.8 mm base for quick interchangeability.
In short, the Iroda S-53 is a genuine OEM 45° hot-knife tip for cutting and sealing foam, plastic, and synthetics on the compact SolderPro 80 and 90 butane irons. It is a consumable part intended as a direct replacement or spare for the hot-knife tip supplied with those tools.
