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The size of coach screw rods shall not be less than the requirements of Table 17.2.4.7.1.
Table 17.2.4.7.1 Minimum Coach Screw Rod Size
Pipe Size Diameter of Rod Minimum Penetration
in. mm in. mm in. mm
Up to and including 4 100 3/8 10 3 75
Larger than 4 100 NP NP NP NP
NP: Not permitted.

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