Brass Knurled Knob (Slotted) NB-A-SR/NB-A-R

[Nominal thread (M)] 2.6(0.45) / 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)