Brass Knurled Knob (Stepped) NB-DC-SR/NB-DC-R

[Nominal thread (M)] 3(0.5) / 4(0.7) / 5(0.8) / 6(1.0)
[Silicone rubber washer (SRW)]
[Material] Silicone rubber
[Color] Translucent
[Hardness] 50° (Durometer type A), 49° (IRHD reference value)
[NBR washer (RW)]
[Material] NBR
[Color] Black
[Hardness] 70° (Durometer type A), 63° (IRHD reference value)