Strengthening Book of Screws (Vol. 46)! Introducing the meaning of each number in the strength classification using "10.9" as an example in a blog format.
The strength classification of steel external threads is based on the combination of two elements represented by numbers. Let's take "10.9" as an example to examine the meaning of each number.
The first "10" indicates the tensile strength, which in this case is 1,000 MPa (megapascals) or 1,000 N/mm² (newtons per square millimeter) of tensile strength.
Tensile strength, as discussed in the screw reinforcement document Vol. 44, refers to the maximum stress that a bolt or screw can withstand when a tensile load is applied along its axis until it fractures. This value is expressed by dividing the load at fracture by the cross-sectional area of the bolt.
So, what does a stress of 1,000 MPa or 1,000 N/mm² mean? It means that a stress of 1,000 MPa (since 1M is one million, 1,000 MPa is one billion pascals) can be applied to an area of 1 m² without causing fracture, or that a stress of 1,000 N can be applied to an area of 1 mm² without causing fracture.
*For more detailed content, please refer to the related links. Feel free to contact us for more information.*
![[Technical Column] The Risks of Foreign Matter Contamination in Food Manufacturing Lines and Their Countermeasures](https://image.mono.ipros.com/public/product/image/eb6/2001076414/IPROS12998311793254762764.png?w=280&h=280)
![[Technical Column] The Strengths and Weaknesses of "Plastic Screws" as the Key to Weight Reduction](https://image.mono.ipros.com/public/product/image/3f8/2001076441/IPROS13775863295196528064.png?w=280&h=280)
![[Technical Column] About the Processing Methods for Custom Screws](https://image.mono.ipros.com/public/product/image/792/2001076446/IPROS70413530538053687221.png?w=280&h=280)
![[Technical Column] Unable to Distinguish the Pitch of Stainless Steel Screws](https://image.mono.ipros.com/public/product/image/682/2001076454/IPROS11935156944708318467.png?w=280&h=280)
