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Lead Protection

Stainless Steel Braid

Stainless steel braid for cartridge heater

  • Swaged in stainless steel braid provides excellent abrasion protection while allowing the leads to be bent in a tight radius.
  • Because the braid is swaged in, it is extremely resistant to pulling out of the heater.

Unheated Length at Lead End of Heater

Heater Length 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 1"
Under 3" Long .25 .20 .35 .29 .39 .39 .54
Over 3" Long .86 .79 .94 .84 1.01 1.00 1.20

Stainless Steel Flexible Conduit

Stainless steel flexible conduit for cartridge heater

  • Flexible conduit (also known as armor or hose) provides maximum lead protection from abrasion but cannot be bent quite as sharply as stainless steel braid.
  • Flexible conduit is swaged into the heater for maximum protection.

Unheated Length at Lead End of Heater

Heater Length 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 1"
Under 3" Long .62 .60 .30 .23 .39 .39 .54
Over 3" Long 1.23 1.20 .89 .84 1.01 1.00 1.2
Conduit O.D. .275 .303 .303 .303 .37 .48 .48

Convoluted Conduit

Convoluted conduit for cartridge heater
  • Convoluted Conduit is not a seal at all, but rather a sealed, stainless steel, flexible hose brazed to the heating element. This protects the lead and covers the end of the heater. It is rated for applications up to 1100°F. 
  • Unlike standard conduit, Convoluted Conduit is sealed and provides complete water resistance at any temperature while forming a positive seal against contamination entering the heater.
  • While the hose is flexible, it is not recommended for applications with continuous flexing and movement. It is best used in applications where moisture or contamination is an issue.
  • It is available only on heaters 1/2" diameter and larger.
  • It is available on standard 5/8" diameter cartridge heaters, 3/4" diameter cartridge heaters and Gala style heaters. In most cases, Convoluted Conduit is brazed directly to the heater.

Convoluted conduit cutaway

Cutaway photo of convoluted conduit.


  O.D. I.D. Dynamic Bend Radius Static Bend Radius
Specifications .50" .25" 5" 1"


Type Max Rec. Comments
Silicone Rubber Fiberglass Sleeving 200°C Can sleeve both leads together or each lead separately.
Fiberglass Sleeving 240°C Good for lead protection and used over crimps.
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