The contact block of this series of switches is standard. See page B 2 for types, drawing of contacts and assembly dimension.
,Model disingnation
 Designation
Signal
Description
 
 1.Mounting Hole
T2
T3
 Φ 22mm/ Φ 25mm
 Φ 30mm
 
 2.Type
BF
BL
BM
BA
BB
BK
BT
PB
 Flat Head
 Long Head
 Mushroom Head
 Long Head(Alternate)
 Mushroom Head(Alternate)
 Push-Lock
 Twin-Touch
 Simple
 
 3.Shape
R
S
L
 Round
 Square
 Rectangular
 
 4.Lens Color
R
G
Y
W
B
BL
 Red
 Green
 Yellow
 White
 Black
 Blue
 
 5.No.of Contact Blocks   Fitted
1-4
 1-4
 
 6.Type of Contact   Blocks fitted
A
B
C
 1a
 1b
 1a1b
1. The upper base and contact block in simple type are of one unit, available with  1a1b contact, Φ22mm/Φ25mm fixing hole, round type only.
2. The mounting holes of square series are Φ22mm/Φ25mm available.
3. Twin-Touch Push Button is available with rectangular shape.

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