Techflex ThermaShield Convoluted Heat Sleeve, 5/8” ID x 4 ft, Silver
Quick Overview
- Techflex ThermaShield Convoluted heat sleeve, 5/8" (15.9 mm) ID, 4 ft piece
- Seamless aluminized fiberglass: reflects radiant heat, rated to 1,200 degrees F
- Slides over hoses and harnesses and bends in any direction
- Fits -6 rubber, -8 PTFE and 5/16" push-lock
- Non-combustible; cuts with scissors
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$8.28
per EACH (USD)Techflex ThermaShield Convoluted Heat Sleeve, 5/8" (15.9 mm) ID, 4 ft Piece
Seamless aluminized fiberglass tube that slides over a hose or harness and bends in any direction: reflects radiant heat from headers, turbos and exhaust.
Techflex ThermaShield Convoluted is braided fiberglass with a laminated aluminum face, formed into a seamless, flexible tube. Racetronix is a Techflex distributor. With no seam, it covers the line all the way round and bends in any direction without opening up. The aluminized face reflects radiant heat and the fiberglass behind it insulates. It slides on, so fit it before the hose ends go on, or choose a size large enough to pass over them. Where the hose is already assembled, use the split T6 ThermaShield instead. This is the 5/8" (15.9 mm) size, sold as a 4 ft piece.
Key features
- Seamless: full coverage all the way round, with no seam to open in the heat.
- Reflects radiant heat; the maker rates the ThermaShield family to 1,200°F (649°C) without delaminating or turning brittle.
- Bends in any direction: suits lines that twist and turn.
- Non-combustible; halogen free; meets FAR 25. Minimum -76°F (-60°C).
- Cuts with scissors. Silver, 4 ft piece.
Which size fits my hose?
This size suits: -6 Stainless braided / nylon braided rubber hose; -8 PTFE hose, stainless braid; -8 PTFE hose, nylon over-braid; 5/16" Push-lock hose.
Choose the size whose inside diameter is equal to or just larger than the outside of your hose or bundle. If the sleeve has to slide over a hose end that is already fitted, size it to the largest part of the fitting instead, or use the split T6 ThermaShield, which wraps on.
Hose outside diameters are nominal values from our own hose pages. Measure your hose if in doubt.
ThermaShield Convoluted chart: all sizes
| Part | Inside diameter | ID (mm) | Wall | Weight per piece |
|---|---|---|---|---|
| 299-TCN0.38SV | 3/8" | 9.5 | 0.045" | 0.10 lb |
| 299-TCN0.50SV | 1/2" | 12.7 | 0.045" | 0.12 lb |
| 299-TCN0.63SV | 5/8" | 15.9 | 0.045" | 0.15 lb |
| 299-TCN0.75SV | 3/4" | 19.0 | 0.045" | 0.18 lb |
| 299-TCN1.00SV | 1" | 25.4 | 0.045" | 0.21 lb |
| 299-TCN1.25SV | 1-1/4" | 31.8 | 0.045" | 0.23 lb |
All sizes are silver and sold as 4 ft pieces.
Equivalents: other brands' slip-on aluminized sleeve
Shopping for another brand? These are slip-on aluminized fiberglass sleeves of the same inside diameter. Constructions differ, so they are near equivalents rather than identical.
| Our part | Instead of (brand) | Their part number | Description | Match |
|---|---|---|---|---|
| 299-TCN0.50SV | DEI | 010418 / 093418 | Heat Sheath 1/2", 36" / 50 ft | Near equivalent |
| 299-TCN0.75SV | DEI | 010403 / 093403 | Heat Sheath 3/4", 36" / 50 ft | Near equivalent |
| 299-TCN1.00SV | DEI | 010419 / 093419 | Heat Sheath 1", 36" / 50 ft | Near equivalent |
| 299-TCN1.25SV | DEI | 010404 / 093404 | Heat Sheath 1-1/4", 36" / 50 ft | Near equivalent |
Other brands' names and part numbers are their owners' trademarks, listed only to help you compare. Check sizes against your application.
Specifications
| Construction | Aluminum-laminated braided fiberglass, seamless convoluted tube |
| Inside diameter | 5/8" (15.9 mm) |
| Wall | 0.045" (1.1 mm) |
| Temperature | Up to 1,200°F (649°C) without delaminating (maker's family rating); minimum -76°F (-60°C) |
| Flammability | Non-combustible; halogen free; meets FAR 25 |
| Cutting | Scissors |
| Sold as | 4 ft piece, silver |
Installing ThermaShield Convoluted
- Cut the sleeve to length with scissors, a little longer than the run you need to cover.
- Slide it over the hose or harness before fitting the second hose end or connector.
- Position it over the hot section, aluminized face out, and secure the ends with stainless ties or clamps so it cannot slide away from the heat.
Which heat protection do I need?
Heat reaches a hose or wire in three ways, and each needs a different kind of protection.
- Radiant heat. A header or turbo throws heat out in every direction, like a stove element, and it reaches anything in line of sight. Reflective foil stops it best: the aluminized face bounces it back before it gets in.
- Heat soak. Hot air and nearby hot parts warm a line slowly and steadily. Insulation stops it. Braided fiberglass traps thousands of tiny pockets of still air, the same way the insulation in a house wall does, and still air carries heat very poorly. Squash the fiberglass and the air goes, and most of the insulation with it.
- Flame, sparks and splash. A burst line, a backfire or weld spatter. This needs a covering that will not burn: a silicone jacket or a non-flammable fibre.
Foil-over-fiberglass products combine the first two: the foil reflects, the fiberglass insulates. Nothing should rest against a bare header; wrap the header, shield the line, or both.
| Situation | Use | Why it works |
|---|---|---|
| The exhaust itself: headers, down pipes, turbo crossovers | Header wrap | Keeps the heat inside the pipe, so far less of it radiates onto the hoses, wiring and bodywork around it. The best fix is usually at the source. |
| A hose or harness close to a header or turbo (strong radiant heat) | T6 ThermaShield split tube or ThermaShield Convoluted | The aluminized face reflects most of the radiant heat before it gets in, and the fiberglass behind it insulates against what does get through. |
| A firewall, floor pan, fuel cell or ECU box facing the exhaust | ThermaShield Flat or ThermaShield Wrap | The same foil over fiberglass, as a sheet that sticks on or wraps around odd shapes. |
| Lines in a hot engine bay: steady heat soak, little direct radiant heat | FireFlex fire sleeve | A thick layer of fiberglass holds still air, which insulates; the silicone jacket seals out oil, fuel and splash. Leave at least 1/8" of air gap so the fiberglass is never squashed. |
| Single wires, sensor and thermocouple leads near heat | Insultherm Tru-Fit fiberglass sleeving | A thin fiberglass braid that insulates without adding bulk. |
| Plug wire boots close to the headers | Insultherm spark plug boot sleeves | Double-thick fiberglass where the boot sits closest to the pipe. |
| Flame, sparks, weld spatter or molten splash | Dragon Sleeve, or FireFlex if the line also needs insulating | Dragon fibre will not burn and shrugs off sparks, but its thin wall holds little air, so it does not insulate much. FireFlex resists splash and insulates. |
All the lines compared:
| Product | What it is | Heat it handles | Continuous rating | How it fits | Best for |
|---|---|---|---|---|---|
| Techflex FireFlex fire sleeve | Thick fiberglass braid with a silicone jacket | Direct heat, open flame, oil and fuel splash | 500°F (260°C) | Slides on before the hose ends go on | Fuel, oil, brake and clutch lines near headers or turbos |
| Techflex T6 ThermaShield split tube | Aluminized fiberglass tube, split, closes with an adhesive strip | Reflects radiant heat | 491°F (255°C) material; reflects radiant heat from a 1,400°F source at 3/8" | Wraps around: no need to remove fittings | Assembled hoses and harnesses near exhaust |
| Techflex ThermaShield Convoluted | Seamless aluminized fiberglass, flexible convoluted tube | Reflects radiant heat | Not published | Slides on | Hoses and wires that bend in several directions |
| Techflex ThermaShield Flat (full adhesive) | Flat aluminized fiberglass with a full adhesive back | Reflects radiant heat | Not published | Sticks to any clean surface | Firewalls, floor pans, fuel cells, ECU boxes |
| Techflex ThermaShield Wrap (adhesive edge) | Flat aluminized fiberglass joined along one edge by adhesive | Reflects radiant heat | Not published | Wraps around odd shapes | Connectors, sensors, short runs |
| Techflex Insultherm Tru-Fit fiberglass sleeving | Acrylic-treated braided fiberglass | Direct heat, no flame or fluid seal | 464°F (240°C) | Slides on | Individual wires, thermocouple and sensor leads |
| Techflex Insultherm spark plug boot sleeves | Double-thick fiberglass sleeves, 7-1/2" long | Direct heat at the header | 1,200°F | Slips over the boot | Plug wire boots close to headers |
| Techflex header wraps: Insultherm, Header Wrap SI, Volcano Wrap | Woven tape wrapped around the pipe | Keeps heat inside the exhaust | Fiberglass 1,200°F; silica 2,000°F; basalt 1,300°F | Wrapped with 1/4" overlap, tied at the ends | Headers, down pipes, turbo crossovers |
| Techflex Dragon Sleeve | Thin double-wall braid of non-flammable Dragon fibre | Flame, sparks, weld spatter, molten splash; not an insulator | None published; the fibre decomposes at 842°F (450°C) | Slides on; the braid expands | Lines and wires exposed to sparks or open flame |
Frequently asked questions
Convoluted or the split T6 ThermaShield?
Convoluted is seamless, so it covers the line completely and bends freely, but it has to slide on. T6 is split and closes with an adhesive strip, so it goes on an assembled hose.
Convoluted or FireFlex fire sleeve?
Convoluted for radiant heat: lines within sight of a header, turbo or exhaust. FireFlex for steady heat soak, flame and fluid splash.
Can I use it on the exhaust pipe itself?
No. It protects lines and wiring from a nearby heat source. Wrap the pipe with header wrap.
Ratings are the maker's published figures.
