Search behavior:
Dash mode filters by dash number (AS568) or size code/part code (ISO 3601 database rows).
Dash numbers are AS568 nomenclature; in ISO mode, exact AS568 dash geometry plus nearest ISO rows are shown for cross-reference.
Dimensions mode filters by d1 and d2 values from the database.
Material and hardness filters constrain rows where those metadata are present.
AS568 tabulated coverage includes the published dash list in the loaded dataset (including 800/900-series entries when present).
Current external coverage includes McMaster metric DIN/ISO rows plus a tabulated AS568 set.
If external data is unavailable, AS568 generated fallback rows are disabled to avoid non-tabulated geometry mismatch.
McMaster links open the direct dash-number catalog view when a dash match is available (SKU-specific part numbers like 9452K197 are separate).
Optional server-side McMaster API lookup can verify mapped part numbers when credentials/certificate are configured on the host.
Tolerance Worksheet
Enter nominal dimensions plus lower/upper tolerance limits to auto-calculate min/max dimensions. O-ring d1/d2 rows are shown at the active temperature.
Input
Nominal Size
Standard/Fit
Lower Tolerance
Upper Tolerance
Min. Dimension
Max. Dimension
Input Geometry
Hardness list is constrained to common available grades for the selected material.
Standards basis:
ISO 3601-1 is used for O-ring size/tolerance class context and designation metadata only.
ORD-5700 methods are used for squeeze, stretch-induced section change, gland fill, and eccentric-clearance checks.
Gland design checks are guidance-style engineering checks and are not defined by ISO 3601-1 itself.
Gap g is derived from worksheet diameters (radial modes), not from a manual fixed clearance input.
O-ring d1/d2 and their tolerance min/max values are temperature-adjusted from 73°F using the entered linear thermal expansion coefficient.
Note: ISO 3601 tooling assumptions are commonly based on 70 IRHD NBR shrink behavior; non-NBR families may require process/tooling compensation to hold class limits.
This build uses nominal-size calculations unless tolerance bands are supplied by the selected database entry.