‘O’ rings
Standard sizes Charts 50, 72 & 17000:
please state the JW number followed
by material reference. If no material or
application conditions are specified, we
will supply our PB80 nitrile grade.
EXAMPLE: JW 50-001 PB80.
Aerospace sizes to BS ISO 3601-1:
please use the following example, where
XXXX denotes Size Code, YYY denotes ID,
and ZZZ denotes cross-section diameter.
EXAMPLE: ‘O’ ring – BS ISO 3601-1A-XXXX
– YYY x ZZZ – S, in FR10/80 to DTD 5612A
Grade 80.
Other sizes: please state ID, cross-section
diameter and material.
EXAMPLE: ID 49.4mm, DS 4.1mm, PB80
Back-up rings
Back-up rings are supplied in spiral form
unless single turn is stated. Also, they are
supplied in PTFE unless otherwise stated.
Back-up ring for Chart 50 inch sizes: for
back-up rings to fit inch size shafts and
cylinders, state the JW number for the ‘O’
ring. Also indicate spiral or single turn, and
material.
EXAMPLE: For a JW 50-433 (0.275”
diameter section) ‘O’ ring on a 5½” OD
shaft or 6” ID cylinder, order JW 50-433