SST and QST Split Sheath Insertion Heaters
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![]() Expansion of the SST Split Sheath Heaters when energized is significant, improving heat transfer (B). Diameters are nominally .005″ undersized for maximum expansion in standard applications with a fit of .005″ – .007″. Where an inconsistently drilled or worn hole creates larger fit considerations, the SST Split Sheath Heater offers exceptional performance (C). The QST, or Quad’s effect is similar to the SST with the exception that there are four separate sections (D). Conductive heat transfer is superior to any available insertion heater (E). |
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TerminationsFig. XS Flexible Leads Figure XS shows both an SST and QST with standard flexible lead wires for temperatures to 850°F/450°C. 12″ length is standard. Specify longer length.Fig. YS Screw Terminals Figure YS shows an SST and QST with standard 8-32 x 1″ welded nickel plated steel studs. Easy terminal connections are made using lugs, leads or bus bar. Stainless steel, and other thread sizes or lengths are available. Consult BigChief. |
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TerminationsFig. AS Stainless Steel Armor Cable Lead Protection Armor cable is the best protection against abrasion or other damage to lead wires. A straight transition adapter with 12″ stainless steel armor cable and 14″ lead wires is standard. Specify longer length.Fig. DS Right Angle Stainless Steel Armor Cable Lead Protection Figure DS shows an SST Insertion Heater with right angle stainless steel armor cable protected leads. Figure DS is for use where spacing is limited and for wiring convenience. 12″ cable and 14″ overall length leads are standard. Specify longer length.Fig. FS Flexible Stainless Steel Braided Leads Figure FS flexible stainless steel braid protects leads from sharp edges. The braided sleeving is virtually as flexible as non-protected leads. 12″ stainles steel braid with 14″ leads are standard. Specify longer length.Fig. GS Right Angle Flexible Stainless Steel Braided Leads Figure GS right angle flexible stainless steel braid protects lead wires from abrasion and are full length flexible at a right angle orientation for installations with limited spacing. 12″ stainless steel braid with 14″ leads are standard. Specify longer length. |
* QST (QUAD) N/A in 3/8″ Diameter |
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TOLERANCES AND LIMITATIONS | |||||||
Nominal Sheath Diamter | 3/8″ | 1/2″ | 5/8″ | 11/16″ | 3/4″ | 1″ | |
Actual Sheath Diameter (±.003″) | .370″ | .495″ | .620″ | .682″ | .745″ | .995″ | |
Minimum Sheath Length | 5″ | 5″ | 5″ | 5″ | 5″ | 5″ | |
Maximum Sheath Length – SST | 72″ | 120″ | 120″ | 120″ | 120″ | 120″ | |
Maximum Sheath Length – QST | N/A | 60″ | 60″ | 60″ | 60″ | N/A | |
Minimum Ohms/inch of EHL | SST | .278 | .308 | .296 | .296 | .350 | .350 |
QST | — | .593 | .593 | .593 | .593 | — | |
Maximum Ohms/inch of EHL | SST | 11 | 21 | 21 | 21 | 26 | 26 |
QST | — | 38 | 38 | 38 | 38 | — | |
Maximum Voltage | 240 | 240 | 480 | 480 | 480 | 480 | |
Maximum Amperage | SST | 15 | 30 | 40 | 40 | 40 | 40 |
QST | — | 30 | 30 | 30 | 30 | — | |
Wattage | +5% – 10% | ||||||
Resistance | +10% -5% | ||||||
Sheath Length | +3% up to 20″; ±2% over 20″ |
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![]() Available Metric Diameters: 10mm, 12mm, 12.5mm, 14.5mm, 16mm, 18mm, 20mmFit = maximum inside diameter of hole minus minimum O.D. of sheath Example: a 3/8″ heater in a .375″ ±.001″ reamed hole would have a .007 fit .376 – .367 = .009Check the required temperature against the watt density and fit indicated on the graph above. |