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The locking force of the nut is directly related to the mechanical equipment connected and the safety performance of the engine. Although bolts and nuts are small parts, they play an important role in connecting. Previously, the Kawasaki Kuo Apache helicopter crashed in Japan and the United States, but it was found that it was caused by corrosion and fracture of the propeller fixing nut. Therefore, the United States has requested Boeing to stop production of the aircraft and require design improvements. There are also a large number of car recalls due to loose nuts directly or indirectly causing other malfunctions
According to the requirements of the National Defense Laboratory, NADCAP, and S400, since 2009, the center has continuously participated in capacity verification organized by the China National Accreditation Service for Conformity Assessment (CNAS) and domestic authoritative institutions, including well-known organizations such as France PTP, the United States CTS, the United States GE-LCP, and China National Capital. The center's verification results are all satisfactory, and most of the results are in the median. Verified the accuracy of the experimental results of our center and maintained its advanced level of detection technology The national military standards implemented by this center mainly include: GJB715.17 "Fastener Test Methods - High Temperature Tension" GJB.23A "Fastener Test Methods - Tensile Strength" GJB715.18 "Fastener Test Methods - High Temperature Double Shear" GJB715.26A "Fastener Test Methods - Double Shear" GJB715.30A "Fastener Test Methods - Tensile Fatigue" GJB715.2 "Fastener Test Methods - Hardness" GJB715.13GJB715.5 Test Methods for Fasteners - Pre tightening Force for Installation of Formed Fasteners GJB715.4 Test Methods for Fasteners - Self locking Nut Pullout GJB715.14 Test Methods for Fasteners - TorqueGJB715.12 Test Methods for Fasteners - Stress PersistenceGJB715.29 Test Methods for Fasteners - Stress FractureGJB715.3 Testing Methods for Fasteners - VibrationGJB715.11 Testing Methods for Fasteners - Sealing Room temperature locking torque of self-locking nut High temperature locking torque of self-locking nut Locking torque of high locking nut Loosening torque of high locking nut Tightening torque of high locking nut Pre tightening force of high locking nut Nut loosening test Deformation Nut pushing test Nut tightening Horizontal vibration of nut at room temperature Horizontal vibration of nut at high temperature Nut airtightness Nut expansion test Torque coefficientFriction coefficient Tightening axial force Function of testing report:1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report 2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems100% inspection and testing process:1. Telephone communication and confirmation of requirements 2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:1. The testing industry is fully covered, meeting different testing needs 2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate 4. Free initial testing, with no testing fees charged 5. Self service order delivery for free on-site sampling 6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China
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