The M21143 dowel pin is an interesting study. According to the published description, “Dowel pins covered by this spec are intended for use in machine applications employing light drives for torque transmission, positioning parts with respect to one another, and for fastening together two or more parts of an assembly.” The drawing/specification NASM21143 is published by the Aerospace Industries Association and is actually a procurement specification while the associated dowel pins are the NASM21143/1 (standard size) and the NASM21143/2 (.0002” undersized). Both pins are made from 303 S.S. and require passivation, but if you thought that’s all there is to it, you’d be wrong. They are both subject to the NASM21143 procurement spec, which carries a boatload of extra requirements:
The procurement specification covers headless straight pins of the following classes…
Class 1: .0002 inch over size
Class 2: .001 inch over size
Class 3: .0002 inch under size
…and pertains not only to NASM21143/1 and NASM21143/2 dowel pins, but also NASM16555 and NASM16556.
While the former two dowel pins require 303 S.S., the latter two, depending on their dash number, can be made from Carbon or Alloy Steel, Austenitic Corrosion Resistant Steel (e.g., 303 S.S.), or Martensitic Corrosion Resistant Steel (e.g., 416 S.S., 410 S.S.). Once again, depending on their dash number, they may or may not be heat-treated, phosphate coated, cadmium plated, passivated, or furnished with a plain finish. They are all subject to double shear force testing, straightness requirements, a maximum surface roughness (on the cylindrical surface) of 16 micro inches Ra (Roughness Average), and roundness requirements.
When you encounter a requirement for a M21143/1 or M21143/2 dowel pin , don’t dismiss it as “just another commercial dowel pin”; as you can see, there’s much more to it when you read the fine print.
Let Horberg Industries be your trusted source for all things NASM21143…you’ve got enough on your plate!
Horberg Industries…Dowel Pins Made Right!
So, you need MS9390 dowel pins?
Well, you’ve come to the right place. In the past five years, we have manufactured over 2.8 million MS9390 dowel pins! If you’re a dowel pin nerd, like we are, you might be interested in some of the characteristics that make these more interesting (and challenging to manufacture) than, say, a commercial dowel pin, then have a look:
In what may be described as a year that defies precedence, 2020 has found the world dealing with a pandemic, the likes of which has seldom been seen. While researchers and pharmaceutical companies have been scrambling to find answers, the push for the human race to survive the pandemic has become the world’s primary concern.
Despite the recent availability of vaccines, COVID-19 testing continues to be in incredibly high demand…and, you guessed it, Horberg dowel pins are playing an important role in this process.
Just as we consider it an honor to support and supply our military as part of our nation’s Defense Industrial Base, we are similarly honored to supply dowel pins used to manufacture equipment that is ultimately used in the fight to detect and end SARS-CoV-2.
Earlier this year we were contacted by a global enterprise manufacturer that specializes in the development, manufacture, and customization of precision measurement devices, automated liquid handling workstations, and sample management systems.
Apropos to this article, they fabricate appliances that are used to assist with COVID-19 virus testing, tracing, and vaccine creation. We have now been producing various pins to their specifications for use within these innovative workstations that provide the swift, but precise movement of liquid samples. Quick and efficient movement translates into the ability to more rapidly process these specimens. This equipment plays a crucial role in the journey toward “normalcy” and we are thrilled to be part of that journey.
Just another example of how small pins play a big role in our everyday lives!
Horberg Industries…Dowel Pins Made Right!
When handling firearms, safety is paramount. To operate a gun safely, it is imperative that it be equipped with a trigger locking mechanism; this is where dowel pins come into play. Dowel pins lay against both the inside and outside of trigger guards in order to restrict them. Of course, since there is no such thing as a “universal” dowel pin, the question that often gets raised, is: how do you know which kind of dowel pin you need for your firearm(s)? Click here to read more
“For the want of a nail the shoe was lost,
For the want of a shoe the horse was lost,
For the want of a horse the rider was lost,
For the want of a rider the battle was lost,
For the want of a battle the kingdom was lost,
And all for the want of a horseshoe-nail.”
Even as someone who is in an industry that uses dowel pins, and understands their importance, the above proverb by Benjamin Franklin, is a good reminder of why these elements, while physically small, still play such a major role in the overall safe operation and functionality of many of our core systems and solutions.
It’s no secret that the aerospace (aviation, space, and defense) industries are subject to a plethora of regulations…and understandably so. These exacting requirements are imposed by OEMs, public and private sector bodies, both domestic and international, to ensure safety and reliability are achieved. They also serve as a common yardstick by which the supply-chain can be quickly measured.