美标螺纹

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3-4 UNC

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3 1/4-6 UN3 1/4-8 UN3 1/4-10 UNS3 1/4-12 UN3 1/4-14 UNS3 1/4-16 UN3 1/4-18 UNS3 3/8-6 UN3 3/8-8 UN3 3/8-12 UN

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