A bolt is a type of fastener consisting of a head and a screw (a cylindrical body with external threads), which needs to be matched with a nut to securely connect two parts with through holes. Mechanical parts, cylindrical threaded fasteners with nuts. It is divided into ordinary bolts and high-strength bolts, and high-strength bolts are high-strength bolts, which belong to a standard component. A very important feature of high-strength bolts is that they are limited to single use and are generally used for connections, and repeated use is strictly prohibited. According to the stress state, it can be divided into friction type and pressure type; According to construction technology, it is divided into torsion shear high-strength bolts and large hexagonal high-strength bolts Bolt testing items:
Torque testing, torque testing, hardness testing, anti slip coefficient testing, effective torque, locking performance, torque coefficient, tightening axial force, friction coefficient, anti slip coefficient, screw-in test, gasket elasticity, toughness, hydrogen embrittlement test, flattening, expanding, hole expanding test, bending, (single or double sided) shear test, pendulum impact, stress relaxation, high-temperature creep, stress endurance test, lateral vibration Fatigue testing, metallographic analysis (microstructure analysis, microhardness testing), chemical composition testing, etc Bolt Testing Standards:
GB/T3098.1-2010 Mechanical Properties of Fasteners - Bolts, Screws, and Studs
ISO898-1 Mechanical Properties of Carbon and Alloy Steel Fasteners
GB/T3934 Technical Conditions for General Thread Gauges
Mechanical Properties of ISO3506 Corrosion Resistant Steel Fasteners
GB/T5779.1-2000 Surface Defects of Fasteners - General Requirements for Bolts, Screws, and Studs
GB/T3098.6-2000 Mechanical Properties of Fasteners - Stainless Steel Bolts Screws and Studs
GB/T16938-2008 Fasteners - General Technical Conditions for Bolts, Screws, Studs, and Nuts
GB/T16823.3-1997 Test Methods for Tightening of Threaded Fasteners
JB/T9151.1-1999 Test Methods for Fasteners - Dimensions and Geometric Accuracy - Bolts, Screws, Studs, and Nuts
SJ2495-1984 Fasteners - Self tapping Threads, etc
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 problemsBaijian 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