Height of an extension spring hook
where:
|
L 0 |
length of free spring [mm] |
|
L Z |
length of spring coiled part [mm] |
Most frequently used hooks of extension springs
|
Hook type and dimension instructions |
Image |
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Half hook, o = 0.55 to 0.8 D 2 |
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Usually: d ≤ 6.3 mm, D >= 3.15 mm, i >= 9 |
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Full loop, o = 0.8 to 1.1 D 2 |
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Used generally |
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Full loop on side, o ≈ D 2 |
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When moving the force out of spring axis does not matter |
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Full loop inside, o = 1.05 to 1.2 D 2 |
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Usually: d ≤= 10 mm, i >= 7 |
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Raised hook, o = 1.2 D 2 to 30 d |
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Usually for: d = 0.5mm to 4 mm, o ≤ 100 mm |
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Double twisted full loop, o ≈ D |
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Used generally |
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Double twisted full loop on side, o ≈ D 2 |
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When moving the force out of spring axis does not matter |
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