Table 1. Automotive industry threshold values from MIL-STD-31000 Rev. A, Appx. C [11].

	Native Data			Derivative Data
Criteria/Use Case	Design	Analysis	Manufacturing	ISO 10303	Visualization	Translation
Curve criteria
Large curve or segment gap (G-CU-LG)	.01 mm max	.01 mm max	.01 mm max	.01 mm max	NR	.01 mm max
Non-tangent curves or segments (G-CU-NT)	2 max	O	O	3 max	O	O
Tiny Curve or segment (G-CU-TI)	.01 mm min.	.01 mm min.	.005 mm min.	.005 mm min.	NR	.005 mm min.
Self-Intersecting curve (G-CU-IS)	0.01 mm	0.01 mm	0.01 mm	.01 mm	NR	0.01 mm
Surface criteria
Non-Tangent surfaces or patches (G-SU-NT)	2 max	O	O	3 max	NR	3 max
Narrow surface or patch (G-SU-NA)	.01 mm min.	A	.005 mm min.	.005 mm min.	NR	.005 mm min.
Self-intersecting surface (G-SU-IS)	.01 mm	0.01 mm	.01 mm	.01 mm	NR	.01 mm
Edge loop criteria
Self-intersecting loop (G-LO-IS)	.01 mm	0.01 mm	0.01 mm	.01 mm	NR	.01 mm
Face criteria
Large edge face gap (G-FA-EG)	.01 mm max	.01 mm max	.01 mm max	.01 mm max	NR	.01 mm max
Narrow face (G-FA-NA)	.01 mm min.	.01 mm min.	.01 mm min.	.01 mm min.	NR	.01 mm min.
Embedded faces (G-FA-EM)	NA	A	.01 mm min.	.01 mm min.	NR	.01 mm min.
Inconsistent face on surface (G-FA-IT)	T	T	T	T	T	T
Shell criteria
Large face gap (G-SH-LG)	.01 mm max	.01 mm max	.01 mm max	.01 mm max	NR	.01 mm max
Over-used edge (G-SH-NM)	>2	A	>2	>2	>2	>2

O – Optional when required by design, A – value agreed by sender and receiver, U – user preference, NR – not required, T – logical value true