Manufacturing accuracy and limit deviation of compression springs

6.1 Manufacturing accuracy and limit deviation of cold rolled cylindrical spiral compression springs

Table 12-2-32

Project	Spring manufacturing accuracy and limit deviation
Limit deviation of load P at specified height△P/N	Effective coils n		≥3~10	＞10
	accuracy class	1	±0.05P	±0.04P
		2	±0.10P	±0.08P
		3	±0.15P	±0.12P
Limit deviation of spring stiffness P’ △P’/N.mm^-1	Effective coils n		≥3~10	＞10
	accuracy class	1	±0.05P’	±0.04P’
		2	±0.10P’	±0.08P’
		3	±0.15P’	±0.12P’
Limit deviation of spring outer diameter D₂ or inner diameter D₁Limit deviation /mm	Winding ratio C		≥4~8	＞8~15	＞15~22
	accuracy class	1	±0.01D Min ±0.15	±0.015D Min ±0.2	±0.02D Min ±0.3
		2	±0.015D Min ±0.2	±0.02D Min ±0.3	±0.03D Min ±0.5
		3	±0.025D Min ±0.4	±0.03D Min ±0.15	±0.04D Min ±0.7
Spring free height H₀ Limit deviation /mm	Winding ratio C		≥4~8	＞8~15	＞15~22
	accuracy class	1	±0.01H₀ Min ±0.2	±0.015H₀ Min ±0.5	±0.02H₀ Min ±0.6
		2	±0.02H₀ Min ±0.5	±0.03H₀ Min ±0.7	±0.04H₀ Min ±0.8
		3	±0.03H₀ Min ±0.7	±0.04H₀ Min ±0.9	±0.06H₀ Min ±1
Limit deviation of total coils △n₁	Total coils n₁ Limit deviation △n₁		1 ±0.25	2 ±0.5	3 ±1.0
Perpendicularity of the ground spring axis at both ends to the end face/mm	Accuracy Level		1	2	3
	Perpendicularity deviation		0.02H₀ (1°26′)	0.05H₀ (2°52′)	0.08H₀ (4°34′)

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6.1 Manufacturing accuracy and limit deviation of cold rolled cylindrical spiral compression springs

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