Parker’s LM158-60 is a 60-durometer blue Fluorosilicone (FVMQ) O-ring material. LM158-60 meets AMS-R-25988 Class 3, Grade 60 (AMS-R-M25988/3), a specification for aircraft fuels and lubricants. Fluorosilicone (FVMQ) is a silicone polymer chain with fluorinated side chains for improved oil and fuel resistance. The mechanical and physical properties are very similar to those of Silicone (VMQ).

O-Ring Size (AS-568): 009
Inner Diameter (In.): 0.208
Cross Section (In.): 0.070
Specification: Commercial
O-Ring Size Series: 000 Series