ANSI B18.6.3-1972, R1991 Appendix
ANSI B18.6.3-1972, R1991 Appendix
(OP)
I am trying to learn about why the Machinerys Handbook has a note at the foot of the Slotted Round Head Machine Screws table 12 stating "Not recommended, use Pan Head machine screws." So far I have not had access to the ANSI document itself. I am seeing this on page 1502 of edition #25 and on page 1577 of edition #26. Does this statement refer to all the round head screws in the table, or to part of them? Does anyone know why the std prefers pan head to round head? Thanx.





RE: ANSI B18.6.3-1972, R1991 Appendix
RE: ANSI B18.6.3-1972, R1991 Appendix
RE: ANSI B18.6.3-1972, R1991 Appendix
"Generally speaking, pan head screws have a larger head diameter and shorter head height as compared to the same thread size for round head screws. We do use some pan head screws here @ ___ but mostly round head. As I see it,
the "not recommended" refers to (ANSI B18.6.3-1972, R1991 Appendix) see pg. 1498 of edition #25, table 7. Very small diameter threads only from 0000,000 and 00 with diameters of .021 to .047" max. dia., NS designation. I would use round head."
I cannot see this in the Machinerys Handbook myself. I am guessing further info must be present in the ANSI specs, but I still need to learn this for myself, so that I can understand this issue properly. Please forgive me for seeming so stubborn and challenging. I am only trying to understand this better.
Is the guidance I was provided by the internal mechanical engineer quoted above true, or... do I need to persuade the company to change? No matter what, I would like a sound understanding of this issue, if only for myself and my future work. Does anyone have further thoughts on this to help me sort this out?
Hope my persistence doesn't drive anyone crazy! Thanx.
RE: ANSI B18.6.3-1972, R1991 Appendix