Knurled L Fin Tube (L-Foot) Tension Wound Finned Tubes
Datang’s knurled l fin tubes are manufactured to your exact specifications to meet the demands of your applications. We offer the following options:
- Tube materials available are carbon steel, alloy steel, stainless steel.
- Fin material is aluminum.
- Tube sizes from 1/2” O.D. to 2” O.D.
- Fin heights from 1/4” to 5/8”
- Fin pitch from 4 fins/in. to 11 fins/in.
- Tubes can be bent into the shapes required for your application.
Knurled L-Foot (KL) Finned Tubes Production Line
Why Choose Datang’s Knurled L-Foot (KL) Design?
Standard L-foot fins can lose grip and loosen during frequent thermal cycling, creating micro-gaps that drastically destroy your heat transfer efficiency.
Datang’s Knurled L-Foot (KL-Type) engineering solves this problem entirely:
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Anti-Loosening Mechanical Interlock: Before winding, the outer surface of the base tube is mechanically knurled with precise micro-ridges. The aluminum fin foot is then wound under high tension, forcing it directly into these ridges to create a rock-solid, permanent mechanical bond.
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Higher Temperature Threshold: While standard L-fins fail at higher temperatures, our KL-type tubes operate stably at up to 250°C (482°F) without any fin loosening or performance degradation.
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100% Base Tube Protection: The continuous, overlapping L-shaped feet provide near-complete surface coverage, shielding carbon steel or alloy base tubes from atmospheric moisture and harsh corrosive elements.
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Superior Mechanical Resistance: Exceptionally rugged and resistant to high-velocity air streams, mechanical vibrations, and high-pressure water washing.
- Datasheet
- Drawing
- Certificates
| Tube Material | Wall Thickness | Tube Diameter | Tube Length |
| All types | From 1.0 to 3.0 mm | 15.88 / 50.80 mm | Max. 18500 mm |
| 0.039 in to 0.118 in | 0.625 / 2 in | 728 in | |
| Fin Strip Material | Fin Strip Thickness | Fin Pitch | Production Capacity |
| Aluminum/Copper | From 0.4 to 0.5 mm | From 2.1 to 3.0 mm | 12000 m per day |
| From 0.015 to 0.019 in | From 8 to 11 fins/inch |
Knurled L Fin Tubes Appearance 100% Quality Inspection
Every production batch undergoes strict quality control, including dimensional checks, fin-to-tube bond testing (pull-off tests), and pneumatic/hydrostatic pressure testing.
KL Type Spiral Finned Tube Advanced Manufacturing Equipment
Our state-of-the-art automated CNC knurling and winding machines ensure uniform tension across the entire tube length without compromising the minimum wall thickness of the base tube.
Knurled l fin tube Secure Packaging for Global Export
We utilize heavy-duty, steel-reinforced wooden crating and specialized internal supports to guarantee that ultra-long or pre-bent finned tubes arrive at your facility in pristine condition.
