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Toroids & HV Terminals


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Spherical Metallic Terminals
toroids, terminals We now can supply you with spherical metallic terminals for your projects. Not only do these pieces offer aethestic value they also provide an amount of capacitance for enhancing the output of Tesla coils and supply the surfaces necessary for reducing leakage in high voltage dc sources. All have 3/8" mounting holes (not threaded). View free PDF sheet for other available sizes up to 65 inches!
- 4" Steel Spheroid, Good Up To 140 kv ... $9.95
- 2" Brass Spheroid, Good Up To 70 kv ... $9.95

Toroidal Terminals For HV Uses
Ready to use for Tesla coil and other high-voltage applications. If these will be used for high-voltage DC stacks or multipliers, they will need to be polished to a shiny mirror-like surface (you can do this yourself, or have it done for you).
toroids

Our laboratory has the tooling and now offers many sizes of toroidal terminals from 3" to 98". Have a look at our PDF sheet to see other available sizes from 3 to 98 inches!

Please contact us for Toroids 30" or larger as the shipping rates on these will vary depending on their destination.

These are spun aluminum of grade 1100-O (99% pure aluminum), with a welded seam on sizes above 12" that is smooth and cannot be seen. Aluminum wall thickness is approximately 1/16" (so the flat central area is about 1/8" thick, for example). Excellent for Tesla coils requiring a capacitive terminal, and high voltage DC generators up to 1.5 million volts. (Note that high voltage DC generators require a highly-polished surface to prevent leakage losses, which is contrary to Tesla operation where you want air leakage to make the sparks. High voltage DC generators should also use seamless toroids as these are easier to finish to a smooth mirror-like surface.)

- For coils up to 250kV, 8"x 2" with ¼" Center Hole  (visible seam) ... $53.50
- For coils up to 500kV, 12" x 3" with ¼" Center Hole  (visible seam) ... $89.50
- For coils up to 750kV, 18" x 4.5" with ¼" Center Hole (no seam) ... $312.50
    - The 18" toroid (with a visible seam) ... $169.95
    - The 18" toroid (no seam & highly polished, intended for Van de Graaff) ... $494.95
- For coils up to 850kV, 20" x 5" with ¼" Center Hole (no seam) ... $369.95
- For coils up to 1Mev, 24" x 6" Welded with ½" Center Hole (no seam) ... $469.95
- For coils over 1Mev, 30" x 7" Welded with ½" Center Hole (no seam) ... $645.95
- For coils up to 1.5Mev, 36" x 6" Welded with 1/2" Ctr Hole (no seam) ... call or email
- For coils up to 2Mev, 40" x 10" Welded with 1/2" Ctr Hole (no seam) ... call or email
- For coils up to 2Mev, 68" x 18" Welded with 1/2" Ctr Hole (no seam) ... call or email

Free PDF sheet

showing available sizes
up to 98 inches.

click to enlarge

Quantity discounts available. View free PDF sheet for other available sizes.

Toroidal terminals used for Tesla coils are for producing a capacitive load that lowers the impedance of the output, consequently giving a hotter and brighter spark. These pieces do not require smooth or shiny surface as do toroids used for high-voltage DC power supplies where smoothness is mandatory to prevent high-voltage Corona leakage.


Aluminum Oblate Terminal
Oblate Terminal We now can offer the high voltage researcher a 14-inch terminal that supports up to 500,000 volts. The 14" diameter (9" across the oblate) has a 3-3/4" hole for mounting onto an insulated column and can be used for the collector terminal of a Van de Graaff generator.

- 14" Aluminum Oblate Terminal ... $249.95

3+ @ $199.95ea.