Ⅰ: Code of product series: three-digit

      157: series157 tact switch

Ⅱ: Figure dimension (length×width): double-digit

      18: 4.0mm×1.8mm    30: 3.9mm×2.9mm

      35: 6.0mm×3.5mm    37: 6.0mm×3.7mm

      38: 6.0mm×3.8mm    47: 4.7mm×3.5mm   

      52: 5.2mm×5.2mm    62: 6.2mm×6.2mm   

      70: 7.0mm×3.4mm    12: 12.0mm×12.0mm

Ⅲ: Height(Free Position): double-digit

      15: 1.5mm      20: 2.0mm       25: 2.5mm  

      31: 3.1mm      33: 3.3mm       35: 3.5mm

      38: 3.8mm      40: 4.0mm       43: 4.3mm   

      50: 5.0mm      60: 6.0mm       70: 7.0mm    

      95: 9.5mm

Ⅳ: Operation force: double-digit

      07: 70gf          09: 90gf

     11: 110gf        13: 130gf

     16: 160gf        18: 180gf    

     20: 200gf        25: 250gf

Ⅴ: Fixed method: single-digit

      0: SMT, type "一" terminal

      1: SMT, type "Z" terminal

      2: SMT, type "V"  terminal

      3: DIP, type "S"  terminal

      4: DIP, type "八" terminal

      5: DIP, direction of switch function and

          mounting pin is vertical

      6: SMT, with a grounding terminal on the housing

Ⅵ: Product life: single-digit

      1: 50,000 times

      2: 100,000 times

      3: 300,000 times

      4: 1M times

      5: 3M times

Ⅶ: Derivative code: single-digit

      0: without special items  

Ⅷ: Package: single-digit

      0=plastic bag      

      1=shrinked plastic bag

      2=tape package 

      3=tube package

      4=foam package  

      5=undeterminedl

      6=plastic  bag without Halogen

      7=shrinked plastic bag without Halogen

      8=tape package without Halogen

      9=tube and foam package without Halogen