The machined dimension of our products are in accordance with recommendations made by the International Electro-thermic Commission. Nevertheless, because of the very strict machining tolerances which have been adopted in our production process we recommend the use of our electrodes with our nipples, which are carefully matched to ensure the best performance. Likewise our products are matched according to their physical properties. However, our electrodes and nipples are interchangeable with those of other suppliers.

Our electrodes are usually offered with tapered nipples, 4 or 3 threads per inch, to the internationally accepted tolerances as per NEMA/IEC-239(1987)/IS-9050 (1979) specifications.


Dimensions



Nipples are tapered and generally have 4 threads per inch. However, if required, they can be made with 3 threads per inch
but only with electrodes of 300 mm (12”) diameter and above. These are shown in following tables:


DIMENSION OF ELECTRODES WITH 4 TPI NIPPLES
ELECTRODES NIPPLES 4 THREADS/ INCH
NOMINAL DIA DEPTH IEC
DESIGNATION
LENGTH
MAXIMUM DIA AVERAGE WEIGHT
INCH MM INCH MM INCH MM INCH MM lb kg
12
300 4.370 111 177T4N 8.5 216.0 7.000 177.80 15.50 7.00
14 350 5.118 130 203T4N 10.0 254.0 8.000 203.20 24.25 11.00
16 400 6.102 155 222T4N 12.0 304.8 8.750 222.25 34.20 15.50
16L 400 7.125 181 222T4L 14.0 355.6 8.750 222.25 38.60 17.50
18 450 6.102 155 241T4N 12.0 304.8 9.500 241.30 40.80 18.50
18L 450 7.125 181 241T4L 14.0 355.6 9.500 241.30 46.30 21.00
20 500 7.125 181 269T4N 14.0 355.6 10.625 269.88 60.60 27.50
20L 500 9.173 233 269T4L 18.0 457.2 10.625 269.88 71.69 32.50
22 550 7.125 181 298T4N 14.0 355.6 11.750 298.45 74.95 34.00
22L 550 9.173 233 298T4L 18.0 457.2 11.750 298.45 92.60 42.00
24 600 7.125 181 317T4N 14.0 355.6 12.500 317.50 28.20 40.00
24L 600 9.173 233 317T4L 18.0 457.2 12.500 317.50 108.00 49.00
26 650 9.173 233 355T4N 18.0 457.2 14.000 355.60 141.0 64.00
26L 650 11.187 284 355T4L 22.0 558.8 14.000 355.60 154.30 70.00
28 700 11.187 284 374T4L 22.0 558.8 14.750 374.65 180.70 82.00
30 750 12.163 309 406T4L 24.0 609.60 16.000 406.40 231.35 105.00
32 800 12.755 324 431T4L 25.0 635.0 17.000 431.80 275.00 125.00

Dimensions


DIMENSION OF ELECTRODES WITH 3 TPI NIPPLES
ELECTRODES NIPPLES 3 THREADS/ INCH
NOMINAL DIA DEPTH IEC
DESIGNATION
LENGTH
MAXIMUM DIA AVERAGE WEIGHT
INCH MM INCH MM INCH MM INCH MM lb kg
12 300 5.354 136 177T3N 10.667 271.00 6.975 177.17 17.60 8.00
14 350 6.023 153 215T3N 12.000 304.80 8.500 215.90 32.00 14.50
14 Long 350 7.125 181 215T3L 14.000 355.60 8.500 215.90 38.50 17.50
16 400 6.023 153 215T3N 12.000 304.80 8.500 215.90 32.00 14.50
16 400 6.692 170 241T3N 13.333 338.70 9.500 241.30 44.00 20.00
16 Long 400 7.125 181 241T3L 14.000 355.60 9.500 241.30 46.30 21.00
18 450 6.692 170 241T3N 13.333 338.70 9.500 241.30 44.00 20.00
18 450 7.126 181 273T3N 14.000 355.60 10.750 273.05 61.70 28.00
18 Long 450 9.173 233 273T3L 18.000 457.20 10.750 273.05 71.60 32.50
20 500 7.126 181 273T3N 14.000 355.60 10.750 273.05 61.70 28.00
20 Long 500 9.173 233 273T3L 18.000 457.20 10.750 273.05 71.60 32.50
22 550 7.362 187 298T3N 14.660 372.40 11.750 298.45 77.00 35.00
22Long 550 9.173 233 298T3L 18.000 457.20 11.750 298.45 94.80 43.00

The nipples for 300 mm (12”) diameter and above sizes electrodes are supplied with a system designed to prevent unscrewing unless a specific request to the contrary is made by the customer. We recommend the use of long nipples which help to achieve a reduction in the number of collar breaks. For changing from 4 threads per inch to 3 threads per inch or from standard to long nipples, we deliver special transfer nipples. Electrodes can be supplied with or without preset
nipples.