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Why Should You Use Standard Metric Fasteners?

What is meant by the term “standard fasteners”? Generally, it refers to fasteners that are stocked on the shelf rather than made to order, which translates into shorter lead times. Often, looking at a catalog will give you a pretty good idea of what is available, but below are some general guidelines and a few exceptions to note.

Standard fasteners lengths follow a pattern. For short fasteners, typically lengths under 20mm are available in 8, 10, 12, 16 and 20mm. Lengths from 20mm to 70mm are available in 5mm increments, while lengths over 70mm skip to 10mm increments. For example, you can get an M10 x 65 or M10 x 70, but the next available length is M10 x 80.

Width Across Flats (WAF) for hex products can be a bit confusing. DIN standard hex head parts are generally stocked more than ISO standard hex heads. This can be significant in diameters M8, M10 and M12. DIN parts are 1mm larger WAF for these sizes, requiring a larger wrench to drive them. Other diameters share the same WAF for both standards. Many distributors consider DIN and ISO hex heads as equivalent even though the heads may be a slightly different size.

Metric socket head products are not readily available in all property classes. Socket head cap screws are offered in 8.8 and 12.9, but not in 10.9. Flat socket head cap screws and button socket head cap screws are available in 10.9, but not in 8.8 or 12.9. Exceptions can be made with special orders, but these are not considered standard.

Contact us through ProvenProductivity@bossard.com to learn more about standard, readily available fasteners.

 

Doug Jones
Applications Engineer
djones@bossard.com

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November 10, 2017

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