Domed Adjustable Tungsten Round – 3.65 to 4.0 ounces


One domed adjustable tungsten round and two, 1/4 inch tungsten cubes for weighting a pinewood derby car. The dome is one inch in diameter. Total weight of approximately 4.0 ounces.


Product Content

One domed adjustable tungsten round and two, 1/4 inch tungsten cubes. Total weight of approximately 4.0 ounces.

Product Specifications

Diameter - 1 inch

Overall Thickness - 0.65 inch

Dome Height - 0.275 inch

Round Height - 0.375 inch

Sample Car with Domed Adjustable Round Painted Orange.
Car Thickness: 3/8 inch at back

What is Tungsten?

Tungsten is a metal with one of the highest densities. Tungsten is 1.7 times more dense than lead, 2.4 times denser than steel, and 2.7 times denser than zinc. race car.

From Randy:
"Looking to make a car with minimal wood and the weight focused at one location, such as the Car Described Here? This Domed Adjustable Tungsten Round allows the placement of the ballast weight at the desired point, and allows nearly 1/2 ounce of weight flexibility. The weight can be adjusted by adding one or two tungsten cubes (included), and/or tungsten putty as needed to adjust the weight. Just make sure to use epoxy to hold the cubes in place."

How to Use this Product

A Domed Adjustable Tungsten Round can be easily used for pinewood derby car weighting if the weight of the car body, wheels, and axles is less than 1.35 ounces. Drill a 1-1/16 inch diameter hole into the bottom of the block. Then cut out the car. After painting, epoxy the round into the hole with the domed extending above the top of the car. Then, after the car is finished, add one or two tungsten cubes, and/or some tungsten putty as needed to fine tune the weight of the car.

Need a drill bit for the Domed Adjustable Tungsten Round? Click Here for a 1-1/16 inch Forstner Bit.

Additional information

Weight 4.5 oz