boat sju
Contributor
The retainer band screw heads on my R108 are stripped. Before I drill them out, are they a standard screw that I can get at a hardware store or will I need to get them on-line?
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Some of the later ones used hex key (Allen wrench) cap screws, but the earlier ones used Fillister head screw. Fillister heads machine screws are available with slotted heads or for Phillips screw drivers.
I personally prefer the slotted head for a standard screw driver.
The early screws were 4-40, but as mentioned, they later used finer threads. The 4-48 screws are standard US screws, but I have the impression that they might have used a metric thread in some of them, but I don't know (some of these regulators were built in Italy).
The 4-40 and 4-48 Fillister head screws are easily found at McMaster-Carr. They are available in Stainless Steel or brass (I buy the Stainless Steel).
McMaster-Carr
McMaster-Carr
You may need to buy a box of screws, but they are less that $5 for 100 of the 4-40 and about $9 for 40 of the 4-48 size. A life time supply, for about the same that will cost you at a local hardware store (if you include gas and maybe your time).
Good luck
Note:
The ANSI basic major diameter of a #4 screw is 0.112 inches. The thread pitch is 40 threads per inch for the coarse thread (#4-40) and 48 threads per inch for the fine thread (#4-48).
clamps screwed down face to face with No thread protusion and a rounded end.