ISO 3601 is a multi-part standard for O-rings and their groove dimensions. Part 1 covers O-ring sizes, Part 2 covers housing dimensions (grooves) for general applications, Part 3 covers quality acceptance criteria, and Part 4 covers anti-extrusion rings (backup rings).

How much compression should an O-ring have?

Typical O-ring compression (squeeze) is 10–30% of the cross-section diameter. For static seals: 15–25%. For dynamic seals: 10–20%. Too much compression increases friction; too little causes leakage.

What surface finish is required for O-ring grooves?

For static seals: Ra ≤ 3.2 μm on groove surfaces. For dynamic seals: Ra ≤ 0.4 μm on the sliding surface, Ra ≤ 1.6 μm on groove bottom and sides. No sharp edges; break all corners with R0.2–0.5 mm.

How do I calculate groove depth for an O-ring?

Groove depth = O-ring cross-section × (1 - squeeze ratio). For example, with a 3.53mm cross-section and 20% squeeze: groove depth = 3.53 × 0.80 = 2.82mm. Add tolerance per ISO 3601-2.

What is the groove fill ratio?

Groove fill ratio is the percentage of groove volume occupied by the O-ring. Recommended: 70–85% for static, 75–85% for dynamic. Below 60% risks spiral failure in dynamic applications. Above 90% risks hydraulic lock.

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密封槽公差 — ISO 3601

依 ISO 3601 查詢 O 型圈槽尺寸與公差。選擇密封類型與截面積尺寸，即可查看槽深、槽寬及表面粗糙度要求。

ISO 3601-2O 型圈槽靜態與動態

溝槽尺寸

溝槽深度

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溝槽寬度

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壓縮率 (%)

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表面粗糙度

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邊緣倒角半徑

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槽深計算

典型壓縮率：靜態密封為 15–25%，動態密封為 10–20%。

標準槽尺寸 (ISO 3601-2)

d2 (mm)	靜態槽深	靜態槽寬	動態槽深	動態槽寬
1.78	1.35	2.5	1.47	2.4
2.62	2.05	3.6	2.20	3.4
3.53	2.82	4.7	2.95	4.6
5.33	4.34	7.0	4.50	6.9
6.99	5.74	9.1	5.90	9.0

所有尺寸單位為 mm。公差：槽深 ±0.05 至 ±0.10 mm，槽寬 ±0.10 至 ±0.15 mm，視尺寸而定。