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Hi-Tek Series 725



Series 725 was Hi-Tek Corporation’s DIN-compliant discrete mechanical switch keyboard series.



Not long after Series 725 was introduced, it was fully retooled, with the rounded plunger design being replaced with an angular style. One possible theory is as follows:


  1. Series 725 production was initially set up in the United States
  2. NMB (later Minebea) moved the production to Thailand
  3. Shipping the tooling to a new country is time-consuming
  4. Production in a new factory will take time to get going

As such, it is possible that NMB that shipping the tooling to another country would be too much of a risk: it would mean a cessation of manufacturing for an undefined period, as any mishaps with import, installation, production etc. would mean an end to manufacturing output until it was resolved.

From this it could be suggested that NMB had replica tooling constructed and tested in Thailand, built to a revised and simpler design for cost efficiency and ease of construction (perhaps from what was learnt from making the original tooling) and once the Bang Pa-in factory was up to speed, the US tooling was scrapped.


The following details are taken from the RT-8200W brochure. The force and travel figures are standard for NMB keyboards.

Contact body Spring temper phosphor bronze
Contact surface Gold alloy inlay
Pretravel 0.070±0.020″ (1.78±0.5 mm)
Total travel 0.140±0.020″ (3.56±0.5 mm)
Operating force 2.0±0.5 oz (57.1±14.2 gf)
3.0±0.5 oz (space bar)
Tactile force 85.6±14.2 gf (audible click keyswitch)
Rated lifetime 100 million cycles