Ⅰ: Code of product series: three-digit

      161: series 161 tact switch

Ⅱ: Code of product dimension: single-digit

      3: length×width=8.8mm×3.5mm

Ⅲ: Code of free position (FP): double-digit

      05: FP=5mm

Ⅳ: Code of fixed method: single-digit

      0: SMT,  type "一" terminal

      1: SMT,  type "Z" terminal

      2: SMT,  type "V" terminal

      3: DIP,  type "S" terminal

Ⅴ: 4-direction operating force: double-digit

      08: 80gf

Ⅵ: Product life: single-digit

      1: 60,000 times

      2: 100,000 times

Ⅶ: Derivative code: double-digit

      00: without special items

Ⅷ: Package: single-digit

      0=plastic bag  1=shrinked plastic package 

      2=tape package     3=tube  package    

      4=foam package    5=undetermined