Standards
The Master O-Ring Size Chart: What It Shows, Why It Helps, and Who It Is For
A practical guide to the handbook Master O-Ring Size Chart: multi-standard sizing, nearest-match search, tolerances, back-up rings, and who gets the most from it.
O-Ring Cord Tolerances (RMA / ARPM E1, E2, E3)
Cross-sectional tolerance for extruded O-Ring cord: the RMA/ARPM Table 13 and ISO 3302-1 classes E1, E2 and E3 in inch and millimeter, how cord compares to a molded O-Ring, how material and durometer change what a mill can hold, plus sponge and cut length tables.
Master O-Ring Size Chart
Filterable multi-standard O-Ring size chart, search by ID or cross-section across AS568, ISO, JIS, BS, DIN and more.
O-Ring Size Charts & Standards (AS568 & Metric)
AS568 and metric O-Ring size charts, dash numbers, groove design, and how to measure an existing seal.
O-Ring Standards & Certifications
O-Ring standards and certifications The O-Ring Store supports: mil-specs, FDA, USP Class VI, 3-A Sanitary, NSF-61, RoHS/REACH, and full lot traceability under ISO 9001:2015.
