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-3xx series, cross-section 0.210 in, widths no / 1 / 2 back-up ring 0.2835 / 0.3135 / 0.4125 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9955 in (bore less the mid diametral clearance 0.0045 in)

-3xx series, cross-section 0.210 in: gland depth 0.1715 in, groove-bottom radius 0.0275 in, mouth edge break 0.005 in, widths no / 1 / 2 back-up ring 0.2835 / 0.3135 / 0.4125 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9955 in (bore less the mid diametral clearance 0.0045 in), hole Ø 1.000 in, 0.200 in lands. Middle of each printed range; the layout is a sample, not a standard.

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

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From the full sheet

O-ring groove dimensions, static radial gland (piston and rod), AS568 cross-sections: every size, notes, mating features and sources. How deep and wide is the groove for an AS568 O-ring in a static piston or rod seal?

Other sizes

• -0xx series, cross-section 0.070 in, widths no / 1 / 2 back-up ring 0.0955 / 0.1405 / 0.2075 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9965 in (bore less the mid diametral clearance 0.0035 in)
• -0xx series, cross-section 0.070 in, widths no / 1 / 2 back-up ring 0.0955 / 0.1405 / 0.2075 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0035 in (rod plus the mid diametral clearance)
• -1xx series, cross-section 0.103 in, widths no / 1 / 2 back-up ring 0.1425 / 0.1735 / 0.2405 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9965 in (bore less the mid diametral clearance 0.0035 in)
• -1xx series, cross-section 0.103 in, widths no / 1 / 2 back-up ring 0.1425 / 0.1735 / 0.2405 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0035 in (rod plus the mid diametral clearance)
• -2xx series, cross-section 0.139 in, widths no / 1 / 2 back-up ring 0.1895 / 0.2105 / 0.2775 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9955 in (bore less the mid diametral clearance 0.0045 in)
• -2xx series, cross-section 0.139 in, widths no / 1 / 2 back-up ring 0.1895 / 0.2105 / 0.2775 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0045 in (rod plus the mid diametral clearance)
• -3xx series, cross-section 0.210 in, widths no / 1 / 2 back-up ring 0.2835 / 0.3135 / 0.4125 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0045 in (rod plus the mid diametral clearance)
• -4xx series, cross-section 0.275 in, widths no / 1 / 2 back-up ring 0.3775 / 0.4105 / 0.5405 in. Piston-style sample ring (grooves in the outside): bore 2.000 in, piston Ø 1.9945 in (bore less the mid diametral clearance 0.0055 in)
• -4xx series, cross-section 0.275 in, widths no / 1 / 2 back-up ring 0.3775 / 0.4105 / 0.5405 in. Rod-style sample block (grooves in the bore): rod Ø 2.000 in, housing bore Ø 2.0055 in (rod plus the mid diametral clearance)