MATERIAL

Our stainless steel tactile domes are made from type 304 Stainless Steel. (AISI 304, or SUS 304). We selected this material because of its low carbon content (0.08%) which offers the best oxidation resistance. Material thickness is .00315", .00395”, and .00470". Material is Vickers Hardness Hv-380 to Hv-420. We purchase our stainless steel from the United States and Japan.


TOOLING

We have four (4) different tools for each dome size. We offer a wide range of actuation force (tactile pressure) for our domes. With four different tools we can compensate for the material thickness and hardness variations and better meet your actuation force requirements. Our standard range of actuation force is from 8 +/- 2.0 oz. average (220 grams) to 20 +/- 2.0 oz. average (570 grams). Tactile pressure variations within a given lot of domes will be an average of 1.5 oz. from nominal. Upon request we can supply domes with actuation forces outside of our standard range, and custom dome designs are also available. We maintain our own in-house tool and die shop.


LIFE EXPECTANCY

Life expectancy of our Metal Domes (domes only, using an ASTM approved rubber tip) exceeds 1,000,000 actuations. You may get different results in your life testing depending on:
1. The type and condition of the surface to which the dome is mounted.
2. The design of the tip that contacts the dome.
3. The amount of force and overtravel you apply to the dome.


DOME SPECIFICATION

Contact Configuration __________________ SPST, Normally Open
Contact Bounce (on) ___________________ <.3 ms
Contact Bounce (off) ___________________ <6 ms
Operating Temperature _________________ -55 C to 125 C
Storage Temperature ___________________ -55 C to 125 C
Humidity _____________________________ 0 - 97% (no condensation)
Contact Resistance ____________________ <100 ohms
with nickel plating ______________________ <1 ohm
Voltage/Current Maximums ______________ 12 ma @ 24 volts DC, RL
Breakdown Voltage ____________________ Over 200 volts
Contact Life __________________________ Exceeds 1 million cycles (in most trip forces)