High-strength fasteners are fastener products with mechanical properties of 8.8 (bolts, studs, inner triangular screws), 8 (nuts), and 33H (set screws). The specific mechanical performance levels are bolt feces 8.8, l0.9, l2} nuts 8, 10, 12, and set screws 33H and 45H. The high-strength bolts are ma... read more
Screw (including bolt) connection and threaded connection are the most widely used detachable connections in precision machinery and instruments. The basic elements of combination screws and threaded connections are threads. The difference is that the screw connection uses connecting parts (screws, ... read more
In precision machinery and instruments, the connecting threads mainly use coarse and fine ordinary threads, and sometimes special fine threads. The difference between coarse thread and fine thread is that when the nominal diameter is the same, the anti-theft screw has a smaller pitch and thread dept... read more
There are many types of screw connections in precision machinery and instruments. Commonly used are cylinder head anti-theft screws, spherical cylinder head screws, and countersunk screws. Cylinder head screws are one of the most widely used screws. Enlarging the diameter of the screw head can incre... read more
Terminology of self-tapping screw connection strength (1) Screw-in torque The screwing torque is the torque required to screw the screw into the threaded bottom hole of the pillar to form a matching thread within the required screwing length. It consists of two parts, namely friction (this is the ma... read more
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