Standards reference
Engineering Standards
Reference pages that explain which standards sit behind DraftFit tools, what each standard covers and where the calculator scope stops.
ISO 286-1:2010 / ISO 286-2:2010
ISO 286 — Limits, Fits and Tolerance Classes
DraftFit reference page for the ISO 286 tolerance-code system used for linear sizes, tolerance classes and fits.
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ISO 3601 series; ISO 3601-2:2025 for housing dimensions
ISO 3601 — O-Rings and Housing Dimensions
DraftFit reference page for the ISO 3601 series used around O-ring dimensions, quality and housing design.
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ISO 1101:2017
ISO 1101 — Geometrical Tolerancing
DraftFit reference page for ISO 1101 geometrical tolerancing concepts, symbols and interpretation.
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ISO 273:1979
ISO 273 — Clearance Holes for Bolts and Screws
Reference overview of ISO 273 clearance-hole series and how DraftFit uses them in the metric thread and bolt tool.
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ISO 898-1:2013
ISO 898-1 — Mechanical Properties of Steel Bolts, Screws and Studs
DraftFit reference page for ISO 898-1 property classes used in preliminary metric bolt calculations.
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DIN 6885-1:2021-11
DIN 6885-1 — Parallel Keys and Keyways
DraftFit reference page for DIN 6885-1 parallel-key and keyway dimensions used in shaft connections.
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ASME Y14.5-2018 (R2024)
ASME Y14.5 — Dimensioning and Tolerancing
DraftFit reference page for ASME Y14.5 GD&T workflows and the differences users should watch when switching from ISO GPS conventions.
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