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Fixed position based upon thread engagement makes them alignment sensitive when pulling at an angle
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Can accommodate thru hole applications
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Load ratings are based upon a number of factors
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Size
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Ring size and thread size
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Material
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Commonly forged from carbon steel or stainless steel (carbon steel and stainless steel have different load ratings for the same size)
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Use angle
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Can only be used up to 45°
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Two different styles and numerous sizes available