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China, Japan, South Korea, North Korea, Mongolia, Hong Kong-China, Macao-China, Taiwan-China, Vietnam, Laos, Cambodia, Thailand, Myanmar, Malaysia, Singapore, Indonesia, Brunei, Philippines, East Timor, Nepal, Bhutan, India, Pakistan, Bangladesh, Sri Lanka, Maldives, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, Turkmenistan, Iran, Iraq, Azerbaijan, Georgia, Armenia, Turkey, Syria, Jordan, Israel, State of Palestine, Saudi Arabia, Bahrain, Qatar, Yemen, Oman, United Arab Emirates, Kuwait, Lebanon, Cyprus, Afghanistan, Norway, Sweden, Finland, Denmark, Iceland, Aland Islands, Bonaire,SaintEustatiusAndSaba, Faroe Islands, Estonia, Latvia, Lithuania, Belarus, Russia, Ukraine, Moldova, Kosovo, Germany, Poland, The Czech Republic, Slovakia, Hungary, Austria, Liechtenstein, Switzerland, United Kingdom, Ireland, Netherlands, Belgium, Luxembourg, France, Monaco, Guernsey, Isle Of Man, Spain, Portugal, Andorra, Italy, Greece, Malta, Vatican, San Marino, Slovenia, Croatia, Albania, Romania, Bulgaria, Serbia, Macedonia, Bosnia and Herzegovina, Montenegro, French Southern Territories, Egypt, Sudan, Tunisia, Algeria, Libya, Morocco, Ethiopia, Somalia, Eritrea, Djibouti, Uganda, Tanzania, Rwanda, Burundi, Seychelles, Kenya, South Sudan, Reunion, Mayotte, Chad, Central African Republic, Cameroon, Equatorial Guinea, Gabon, The Republic of Congo , The Democratic Republic of the Congo, The Democratic Republic of Sao Tome and Principe, Mauritania, Western Sahara, Senegal, Gambia, Mali, Burkina Faso, Guinea, Guinea-Bissau, Cape Verde, Sierra Leone, Liberia, Republic of Côte d'Ivoire, Ghana, Togo, Benin, Niger, Nigeria, Angola, Zambia, Malawi, Zimbabwe, Mozambique, Republic of Botswana, Namibia, Republic of South Africa, Swaziland, Lesotho, Madagascar, Mauritius, Comoros, Saint Helena, Australia, New Zealand, Papua New Guinea, Solomon Islands, Vanuatu, Micronesia, Marshall Islands, Palau, Fiji, Kiribati, Nauru, Tuvalu, Samoa, Tonga, Niue, The Cook Islands, American Samoa, Cocos Islands, Guam, Northern Mariana Islands, New Caledonia, French Polynesia, Tokelau, Wallis And Futuna, Canada, United States, Mexico, Bahamas, Cuba, Jamaica, Haiti, The Dominican Republic, Saint Kitts and Nevis, Antigua and Barbuda, Commonwealth of Dominica, Saint Lucia, Saint Vincent and the Grenadines, Barbados, Grenada, Trinidad and Tobago, Anguilla, Bermuda, Greenland, Guadeloupe, Jersey, Cayman Islands, Martinique, Montserrat, Saint Pierre And Miquelon, Puerto Rico, Sint Maarten, United States Minor Outlying Islands, U.S.Virgin Islands, Guatemala, Belize, Salvador, Honduras, Nicaragua, Costa Rica, Panama, Colombia, Venezuela, Guyana, Suriname, Ecuador, Peru, Llívia, Brazil, Chile, Argentina, Uruguay, Paraguay, Curacao, Falkland Islands, French Guiana
Grade 12.9 bolts have the following characteristics:
High Tensile Strength: The minimum tensile strength can reach above 1220 MPa. Compared with ordinary bolts, they can withstand greater tensile forces without breaking, fully meeting the high requirements of fasteners for special occasions and components in industrial and mining enterprises.
High Hardness
Meeting Rockwell Hardness Standard: The Rockwell hardness (HRC) can range between 39 and 44. This high hardness enables the bolts to better maintain the shape and dimensional accuracy of the threads during the tightening process, making it less likely to have problems such as deformation and wear, thus ensuring the reliability and tightness of the connection.
Good Toughness
Undergoing Special Treatment: Through reasonable heat treatment processes such as quenching and tempering, the bolts possess good toughness while maintaining high strength and high hardness. When subjected to dynamic loads or impact loads, they can effectively absorb energy, avoiding brittle fracture and prolonging the service life of the bolts under complex working conditions.
Precise Dimensional Accuracy
Strict Manufacturing Process: The production process strictly adheres to high-precision standards. Advanced processing equipment and precision molds are used to ensure the precise dimensions of each part of the bolts. For example, parameters such as the pitch and thread form of the threaded part meet strict tolerance ranges, with a general accuracy of up to ±0.03 mm, enabling a tight and accurate fit with the nut and effectively preventing loosening.
Good Interchangeability
Strong Universality of Components: Due to the high dimensional accuracy, grade 12.9 bolts have good interchangeability with their matching nuts, washers and other components. During installation and maintenance, damaged or non-compliant bolts can be conveniently replaced. Bolts of the same specification can be interchangeably used in different steel structure components, improving the construction efficiency and the universality of materials.
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