there is a case we usually meet, do you know it? Yes! a plastic part has two screws located along the same axis, the pitch and tightening direction should be the same, it simples mold structure design and the part production.
there is a case we usually meet, do you know it? Yes! a plastic part has two screws located along the same axis, the pitch and tightening direction should be the same, it simples mold structure design and the part production.
There are wide varieties of fastener hardware on the market today used by manufacturers in the assembly of every single product we use daily. Shoulder screws, while not typically found in your local hardware store, are extensively used in almost every industry because they are incredibly versatile and offer unique attributes when installed.
What are shoulder screws?
Shoulder screws, also called Shoulder Bolts or Stripper Bolts, are a type of screw with three distinct sections: the head, the unthreaded shoulder, and the threads. These types of screws consist of integral threads that are present on half or less of the screw shank and the rest of the shaft is enlarged and smooth to allow the bolted material the ability to rotate or move around the screw axis. These types of screws come in two varieties – commercial and precision. What is the difference between commercial and precision?
Vented Shoulder Screw
Commercial shoulder screws are all made to the ASME B18.3 standard (for inch sizes) and ASME B18.3.3 (for metric sizes). The shoulder diameter can measure between ¼” to 2”, the thread class is 3A, and the shoulder tolerance is +0.005/-0.005.
Precision shoulder screws, also known as tight tolerance shoulder screws, are not governed by standard sizing like commercial shoulder screws are. The shoulder diameter can measure between 3/32” to ½”, the thread class is 2A, and the shoulder tolerance can range between +0.000/-0.001 to -0.0005 to -0.0015. The shoulder length of a precision shoulder screw also has a tighter tolerance at -0.000 to +0.002.
Working with an experienced plastic injection molder and engineering team is a critical component to avoiding many issues that can occur during the design and development process. If you keep these factors in mind during the design process, and align with a knowledgeable plastics engineer, you will be on track to get your product to market quicker and within your budget.
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i am a plastic product designer, I can discuss more detail about plastic product design when I feel free
you are welcome any time!
as a product designer, I usually design plastic parts, I can understand your opinion
this is a rule for designing a plastic part, actually many design rules for designing a plastic part are very special
thanks for sharing this design detail, very good!