cartridge heaters, tolerance, engineering reference, voltage, heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters

Cartridge Heaters Metric Insertion Heaters.com

Cartridge Heaters Configurations Styles and Terminations Construction of Cartridge Heaters and Features Optional Features-Cartridge Heaters Mounting Options-Cartridge Insertion Heaters Electrical Terminations Cartridge Heaters Diameter, Tolerances, Actual vs Nominal Diameter-Cartridge Heaters Tolerances-Cartridge Heaters Installation Tips 2 and Preventive Maintenance-Cartridge Heaters Cartridge Heaters-FAQ's Evaluating 2 Your cartridge Heater Problems Heat Calculations Watt Density Catridge Heaters-2 Order Form-How to Order Cartridge Heaters Split Sheath Cartridge Heaters Square Cartridge Heaters Small Diameter, Miniature Pencil Heaters Bolt Cartridge Heaters
Search this site:

Profile Literature Links Sitemap Contact Us

Re: Tolerances-Cartridge Heaters/Insertion Heaters-Power, Length & Camber Tolerance:

Insertion Heater with S.SteelOver-Braid
Insertion Heater with S.SteelOver-Braid
Custom cartridge heaters
Cartridge Insertion Heater with Armour Leads with 90 Exit and Copper Elbow

Cartridge Heater Tolerances


The tables below give the maximum and minimum actual diameter of cartridge heaters available with National Plastic Heater. If you're looking for something specific that isn't in our list, you can call us toll free (877-674-9744) and tell us what you need or you can complete our cartridge heaters order form here and we will quote you within one business day.


Cartridge Heater Nominal Diameter Bore/Drill Size

Actual Diameter, Maximum

Actual Diameter, Minimum

 

Cartridge Heater NominalDiameter
HoleSize (Metric)

Actual Diameter, Maximum

Actual Diameter, Minimum

1/8" (0.125")

0.124"

0.120"

 

6mm

5.97mm

5.87mm

5/32" (0.15625")

0.155"

0.152"

 

6.5mm

6.48mm

6.38mm

3/16" (0.1875")

0.186"

0.183"

 

8mm

7.98mm

7.85mm

1/4" (0.250")

0.249"

0.244"

 

10mm

9.96mm

9.85mm

5/16" (0.3125")

0.312"

0.308"

 

12mm

11.96mm

11.86mm

3/8" (0.375")

0.374"

0.369"

 

12.5mm

12.47mm

12.34mm

1/2" (0.500")

0.499"

0.494"

 

13mm

12.98mm

12.85mm

5/8" (0.625")

0.624"

0.619"

 

15mm

14.99mm

14.86mm

3/4" (0.750")

0.749"

0.741"

 

16mm

15.95mm

15.82mm

15/16" (0.9375")

0.936"

0.928"

 

17.5mm

17.47mm

17.27mm

1" (1.000")

0.999"

0.991"

 

20mm

19.96mm

19.76mm

1-1/4" (1.250")

1.249"

1.241"

 

 

 

 

1.90" (1.900")

1.910"

1.890"

 

 

 

 

2-3/8" (2.375")

2.385"

2.365"

 

 

 

 


Cartridge Heater Tolerance of Power, Length, and Camber


Power tolerance, or how close the actual dissipated power at the specified voltage is to the specified power, is typically +5%/-10%. It is possible to have cartridge heaters built with tighter tolerances, but it will drive the price up. For instance, we have one customer who uses cartridge heaters as damping resistors in an RF application. For that guy, we specify the resistance and the resistance tolerance of the cartridge heater rather than its power.


Length tolerance, is a measurement of what the actual length is relative to the specified length. For our stock list cartridge heaters, length tolerance is 0.005" per six inches of length for units up to 12" long and 0.020" per foot for units over 12" long. For quick turn Build-To-Order cartridge heaters, length tolerance is 2%.


Camber tolerance, is a measure of straightness of the cartridge heater. Cartridge heaters may vary from a straight line by as much as 0.010" per foot for lengths up to 12", and by as much as 0.018" per foot for lengths greater than 12".






cartridge heaters insertion heaters
cartridge heaters-standardOhms Law Calculator cartridge heaters brochureCartridge Heaters, Metric Insertion Heaters-Brochure
slit sheath cartridge heatersTemperature Conversion Calculator cartridge heaters designDesign Your Cartridge Heaters-Here
square cartridge heatersVoltage Engineering Reference cartridge heaters problemsEvaluating Your Cartridge Heater Insertion Heater Problems
miniature small diameter cartridge heaters3 Phase Calculator-Delta & Wye cartridge heaters-installation tips and maintenanceCartridge Heater-Installation Tips & Preventive Maintenance
bolt cartridge heatersCalculator for Heating Solids, Fluids or Gases within a Specific Time cartridge heaters, metric insertion heaters additional informationAdditional Cartridge Heaters Information


Our industrial electric cartridge heaters including metric and imperial heaters...

Consists of the following cartridge/insertion heater categories:

cartridge heaters, tolerance, engineering reference, voltage, heaters  Standard imperial and metric round cartridge heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters  Medium watt density cartridge heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters  High watt density cartridge heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters  Split sheath cartridge heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters  Square cartridge heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters  Small diameter/miniature pencil heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters  Bolt cartridge heaters
cartridge heaters, tolerance, engineering reference, voltage, heaters  Custom cartridge/insertion heaters

Applications for the above include:

cartridge heaters, tolerance, engineering reference, voltage, heaters  Cartridge Heaters for-Extrusion Dies, Liquid Immersion
cartridge heaters, tolerance, engineering reference, voltage, heaters  Metric Heaters for-Plastic Molds and Injection Molding
cartridge heaters, tolerance, engineering reference, voltage, heaters  Insertion Heaters for-Plastics Extrusion
cartridge heaters, tolerance, engineering reference, voltage, heaters  Custom Cartridge Heaters for-Packaging Machinery, Labeling and Sealing
cartridge heaters, tolerance, engineering reference, voltage, heaters  Square and Round Cartridge Heaters for-Hot Plates and Platens, Hot Stamping
cartridge heaters, tolerance, engineering reference, voltage, heaters  Cartridge Heaters for-Hot Runner Molds, Various Types of Dies
cartridge heaters, tolerance, engineering reference, voltage, heaters  Insertion Heaters for- Medical Equipment and Other Industrial Applications

The square cartridge heater configuration simplifies wiring and installation while optimizing performance in a wide range of solid, liquid, and gas heating applications. Tooling applications are particularly well served by the square cartridge heater approach. Typical square cartridge heating applications include platens, molds, sealing bars, sealing plates and dies. Versatile slot style mounting simplifies installation in small tooling components such as bushings and nozzles and is particularly useful when leads must exit at a specific location on the component surface.

Some applications demand much longer heater life, that is where miniature small diameter pencil/cartridge heaters have immense application value. Life expectancies of five, seven or even ten years are not unreasonable for some mission-critical applications:


cartridge heaters, tolerance, engineering reference, voltage, heaters  Blood warmers used in medical theaters must never fail
cartridge heaters, tolerance, engineering reference, voltage, heaters  Battery conditioners for EVA spacesuits on the International Space Station must last ten years      before replacement, due to payload costs
cartridge heaters, tolerance, engineering reference, voltage, heaters  Here on earth, high throughput semiconductor chip testers must operate without significant      downtime for the 5 year life of the equipment. For these applications, a service life of 50,000 to      90,000 hours is a requirement that is both reasonable and attainable.

Some common issues with most standard cartridge heaters are as follows:

Heater removal: a cartridge heater will oxidize after many hours of operation and maybe difficult to remove. Consider drilling a through hole so the heater can be hammered out or choose a split sheath cartridge heater.

Lubricants: like graphite or silicone facilitate the insertion of the cartridge heater but can carbonize at higher temperature and then the heater will be really stuck.

The NPH split sheath cartridge heateris designed especially for platen, die or mold industrial heating applications where the holes are poorly drilled or worn through age. Independent expansion of each section of the split sheath cartridge heater when energized, creates intimate contact with the wall of the hole.

Through the patented split-sheath design and highly specialized manufacturing techniques, NPH split sheath insertion heaters reduce your total cost of process heating by an average of 40% over other heaters.

NPH’s split sheath cartridge heaters use a unique, patented split-sheath design that expand when energized to maximize heat transfer through greater contact with the wall of the bore. Better heat transfermeans less power is consumed to maintain the set point temperature, reducing operating costs.

Bolt cartridge heaters are used to tighten large bolts that secure heavy machinery and equipment. The shaft of the heater is inserted into the hollow bolt and energized to expand it, which allows further tightening of the nut. Manufactured with a high watt density, they heat up in just a few minutes, resulting in cost savings on reduced man hours removing nuts from bolts and studs. Large bolts can be heated to full expansion in just a few minutes. This heater design is manufactured with specific diameter sheaths to fit industry standard hollow bolts. High watt densities with special heated lengths distribute heat evenly to surrounding bolt.



cartridge heaters, tolerance, engineering reference, voltage, heaters cartridge heaters, tolerance, engineering reference, voltage, heaters

Telephone: 905-859-8225        Facsimile: 905-859-4691

sales@nphheaters.com

Toll Free: 1-877-674-9744