Hexagon Screws High Strength Bolts Outer Hexagon Screws M6 Hot-Dip
Galvanized Hexagon Bolts Custom Non-Standard Fastener
Material: carbon steel, stainless steel, aluminum alloy, brass,
titanium alloy, nylon, etc
Surface treatment: zinc plating, nickel plating, tin plating,
passivation, sandblasting, oxidation, polishing, etc
Specifications: A variety of options or to customize
Standards: DIN, ISO, ANSI, ASME, BS, JIS, and non-standard
Grades: 4.8, 8.8, 10.9, 12.9, etc
Product packaging: plastic bag + tray + export carton, or according
to customer requirements
Production models: wire drawing machine, multi-power cold heading
machine, tooth rolling machine,
casting molding, heart walking, and so on
Scope of application: mechanical fasteners, industrial fasteners,
engineering fasteners, and other domestic and industrial use
Common screw problems:
First, the diameter of the screw: the diameter of the general screw
refers to the thickness of the threaded part.
In the production and national standards, the diameter of the
screws are tolerances, such as 10.5mm,10.62mm,
and 10.75mm are 11mm screws
Second, the length of the screw:
Countersunk (flat) screws are calculated according to the total
length of the screw,
while other hexagonal, round, etc. are calculated according to the
size of the screw.
The screw length also has positive and negative tolerances.
Three, screw specifications:
For example, M6*58 finger screws have a diameter of 6 and a length
of 58
4. Nut, flat washer, stop ring, and other dimensions:
The diameter (thickness) of the screws used shall prevail
Questions and Answers about carbon steel with alloy steel screws:
What are the performance levels of carbon steel and alloy steel
screws?
A: Bolt performance rating: 3.6, 4.6, 5.6, 6.8, 8.8, 9.8, 10.9,
12.9 and other more than ten grades
Second, what is the concept of hierarchy?
For example, the definition of 4.8 is: 4 represents 4*100=400MPa,
referring to the tensile strength of the bolt is 400Mpa,8 is the
bending strength ratio of 0.8,
and the nominal bending strength of 400*0.8=320Mpa, the higher the
level of bolt performance is better.
Three, what is the pitch?
A: Pitch is commonly known as tooth pitch, pitch represents thread
spacing, that is, spiral spacing,
defined as the axial distance of the corresponding point diameter
of the adjacent two teeth on the thread, the code is P
Fourth, what is the definition of high strength?
A: As long as the screw grade is more than or equal to 8.8, it is
considered a high-strength bolt
Five, how to choose different grades of bolts?
A: Normal general use at 4.8 level is enough, mechanical equipment
is generally noisy at 8.8 level or more,
there are anti-rust requirements to choosing stainless steel
