Floor expansion carbon steel tension explosion Wall plug sleeve gecko floor expansion bolt

"Cross recessed pan head screws refer to cross recessed machine screws, denoted by the letter PM. The national regulations specify that the thread specification is M1.6-M10, the performance grade is 4.8, A-50, A2-70, CU2, CU3 and AL4, H and Z cross recessed pan head screws, and the product grade is A.
If other technical requirements are required, they should be selected from the current standards (such as GB/T196, GB/T3106, GB/T3098.1, GB/T3098.6, and GB/T3098.10)"

"Stainless steel nut
Hexagon nut (GB6170/DIN934), thin nut (GB6172/DIN439), heavy nut (metric, American), nylon lock nut (DIN985-DIN982 thick), all metal lock nut (DIN980M), cover nut (DIN1587), flange nut (GB6177/DIN6923), flange nut nylon lock nut (DIN6926), square welded nut (DIN928), hexagonal welded nut (DIN929), butterfly nut (GB62, DIN315, American) K hat, etc. Specification: M1.6-M64"

Knurled copper nuts are mainly used for injection molding, metal springs, profiled springs, craft gift springs, battery spring pieces, spring antennas, Keychain, phosphor copper spring CNC automatic lathe turning parts (copper turning parts, iron turning parts, aluminum turning parts), metal stamping parts, electronic hardware parts, iron shafts, single spline shafts, multi spline shafts, iron pins, non-standard screw nuts, connectors, fasteners Hardware products such as wire forming (metal wire business card holder, model aircraft landing gear, S-hook, R-type bolt, triangular buckle, D-type buckle) belong to the copper nut series.

"Hexagonal head bolts are divided into two types: outer hexagonal bolts and inner hexagonal screws.
According to the force bearing method of the connection, there are ordinary and reamed holes. The bolts used for reaming holes should match the size of the holes and be used when subjected to lateral forces. According to the shape of the head, there are hexagonal heads, round heads, square heads, countersunk heads, etc. Generally, countersunk heads are used in places where the surface is required to be smooth and without protrusions after connection, because countersunk heads can be screwed into the parts. Round heads can also be screwed into the parts. The tightening force of square heads can be greater, But the size is very large. Hexagonal heads are the most commonly used.
In addition, in order to meet the needs of locking after installation, there are holes in the head and the rod, which can prevent the bolts from loosening when subjected to vibration"

"When installing mechanical components on concrete foundations, the J-shaped or L-shaped end of this bolt is buried in the concrete for use.
The tensile capacity of the anchor bolt is the tensile capacity of the round steel itself, which is equal to the cross-sectional area multiplied by the allowable stress value (Q235B: 140MPa, 16Mn or Q345:170MPA), which is the allowable tensile bearing capacity during design.
Anchor bolts are generally made of Q235 steel, which is smooth and round. Thread steel (Q345) has high strength, making the thread of the nut not as easy as smooth and round. For smooth round anchor bolts, the burial depth is generally 25 times its diameter, and then a 90 degree hook with a length of about 120mm is made. If the diameter of the bolt is large (such as 45mm) and the burial depth is too deep, a square plate can be welded at the end of the bolt to make a large head (although there are certain requirements). The burial depth and bending hook are both to ensure the friction between the bolt and the foundation, so as not to cause the bolt to be pulled out and damaged"