Re: Coupler Mounting Screws
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Actually, binder head screws are used in conjunction with binder posts, a T-shaped internally-threaded post which fits in standard punched holes in paper. The posts and the screws are used to >>bind<< booklets and to get to topic, freight car diagram books. Having caused the ELHS to republish freight, passenger and locomotive diagram books, I am quite familiar with them.
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> On Behalf Of Daniel A. Mitchell
Sent: Friday, July 10, 2020 4:27 PM
Subject: Re: [RealSTMFC] Coupler Mounting Screws
What you illustrate is called a “binder-head” screw. They have the thinnest head among the common screw types. Due to the shallow head few have Phillips or cross-head driving recesses. They were developed to hold wires to terminals, called “binding”. They are commonly found in the electronics industry, especially on barrier-type terminal strips.
Slightly thicker and more rounded are “pan-head” screws. The thicker head allows, in addition the common slot, use of Phillips or cross-head driving recesses.
Next up in head thickness is the common “round-head” screw where the head is nearly hemispherical.
There are many other types. The more common include:
“stove-head” screws (sometimes called" truss-head”) that have a larger diameter thin head. The name comes from their original use in assembling sheet metal heating and cooking stoves.
“fillister-head” screws (sometimes called “cheese-head”) have a thick cylindrical head, usually with a slightly convex top surface. These are found mostly in machine assembly. Some of the Kadee plastic screws have this head.
Most of the thicker head styles are also available with “Allen” (hex socket) driving recesses, and nowadays “”Torx” or similar star-shaped recesses.
Complicating the issue is that every make uses slightly different shape and proportions, plus many commercial large-scale users specify their own designs.