Compression spring end form and height, formula for total Coils

Table 12-2-14 Calculation formula of total Coils n1, free height H0, and compression height Hb

Structure Type		Coils n	Free height H0	Compression height Hb
Ends are not tight Not ground		n	nt+d	(n+1)d
Ends not tight 1/4 turn flat		n+1/2	nt	(n+1)d
The end is not tight and not ground, and the support ring is 1 circle		n+2	nt+3d	(n+3)d
The ends are not tightly ground, the support ring is 3/4 turn		n+1.5	nt+d	(n+1)d
The ends are ground and flat, and the support ring is 1 circle		n+2	nt+1.5d	(n+1.5)d
The ends are ground and ground, and the support ring is 1-1/4 turns		n+2.5	nt+2d	(n+2)d

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