T51 127mm 5" threaded button bits could be produced as per your requirements completely, such as flat face or drop-center face; normal body or retrac body; spherical buttons, ballistic buttons or parabolic buttons.
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T51 threaded button bits are:
R22-32mm, R22-36mm, R22-38mm, R22-41mm;
R25-33mm, R25-35mm, R25-37mm, R25-38mm, R25-41mm, R25-43mm, R25-45mm;
R28-37mm, R28-38mm, R28-41mm, R28-43mm, R28-45mm, R28-48mm;
R32-41mm, R32-43mm, R32-45mm, R32-48mm, R32-51mm, R32-54mm, R32-57mm, R32-64mm, R32-76mm;
T38-64mm, T38-70mm, T38-76mm, T38-89mm, T38-102mm, T38-127mm;
T45-76mm, T45-89mm, T45-102mm;
T51-89mm, T51-102mm, T51-115mm, T51-127mm;
T60-92mm, T60-96mm, T60-102mm, T60-115mm, T60-118mm, T60-127mm, T60-140mm, T60-152mm etc.