The screws are 4 8 and should be used with a wrench

It is the strength level, and the size of the hexagon determines how big the wrench to use, and what is the distance between the opposite sides of the hexagon, how big the wrench to use. The open end wrench used in the hexagon is more accurate to correspond to the hex nut because of the presence of hex head bolts.

and small hexagon head bolts.

Commonly used open-end wrench specifications are; The corresponding thread specifications are M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42 full set of hex wrenches.

The minimum specification is 3, and its correspondence is s3=m4, s4=m5, s5=m6, s6=m8, s8=m10, s10=m12, s12=m14-m16, s14=m18-m20, s17=m22-m24, s19=m27-m30, s24=m36, s27=m42.

Calculation method of the diameter of the threaded bottom hole before tapping: for brittle materials, according to the basic size pitch.

For plastic materials, according to the basic size of the thread - pitch + brittle material in the pure cutting state when tapping, the bottom hole size is the diameter of the bottom of the thread, and the plastic material will move to the thread path due to the plastic deformation after the material is stressed when tapping, so the bottom hole should be appropriately enlarged. For threaded holes below M6, regardless of the material properties, the basic size - pitch is uniform.

Bolt strength. How to determine the grade of ordinary bolts is divided into two kinds: A-grade, B-grade (refined bolts) and C-grade (crude bolts), A, B-grade bolts use grade and grade steel, C-grade bolts use grade and grade steel. High-strength bolts.

Grade and grade steel are used. 10 in the grade indicates that the ultimate tensile strength of the steel is fu=1000n mm2, which indicates the yield strength of the steel.

fy=, and so on for other models. Anchors.

Q235 or Q345 steel is used.

10 is M10, which is the common name for a nut or bolt with a nominal diameter of 10 mm.

How big is the wrench refers to the length of the opposite face of the nut on all six sides.

Due to different uses, the wall thickness of the nut is also manufactured into different thin thicknesses, that is, the outer diameter of the nut with the same nominal name is also different, and you can choose according to the situation. In fact, if you use it often, you will know it at a glance, and I have never seen a master who uses calipers to measure the nut and then choose the wrench.

A wrench is a commonly used installation and removal tool, which is a hand tool that uses the lever principle to twist the opening or sleeve fastener of bolts, screws, nuts and other threaded tightening bolts or nuts. Wrenches are usually made of structural steel made of carbon or alloy materials.

Wrenches are usually made with openings or sleeves for clamping bolts or nuts at one or both ends of the shank, and when used, external force is applied to the shank along the direction of thread rotation to turn the bolt or nut.

The threaded rod is 6m, which is commonly referred to as six screws.

The size of the bolt used in the torx wrench of 18 is 12 mm.

A screw is an inclined plane that utilizes an object.

Circular rotation and friction.

The principles of physics and mathematics are used to tighten the tools of the old man step by step. Screws are a generic term for fasteners, everyday colloquialism. Screws are an indispensable industrial necessity in daily life

Such as very small screws used in cameras, glasses, clocks, electronics, etc.; General screws for televisions, electrical products, musical instruments, furniture, etc.

As for engineering, construction, and bridges, large screws and nuts are used.

Transportation equipment, airplanes, trains, automobiles, etc., are used with both large and small screws. Screws have an important role in industry, and as long as there is industry on the earth, the function of screws will always be important. Screw is a common invention in people's production and life for thousands of years, according to the application field, it is the first major invention of human beings.

Basic meaning. Screw, also known as "screw" screw] (screw.

screw" (screw rod). In fact, screws are a common name, and screws and screws are different from each other. Screws are generally called wooden screws.

It is the kind with a pointed tip at the tip, pitch.

It is larger, and is generally used for fastening wooden parts and plastic parts. The screw rod is a machine screw (machine screw), which is the kind with a flat head at the front end, with a small and uniform pitch, and is generally used to fasten metal and machine parts.

10 wrenches to tighten the socket screws of M12.

Tighten 6m screws, which is six rods thick.

25mm screws with a 25mm wrench.

Screws, also some people call them "screws", "screws". In fact, screws are a generic name, and screws.

The screws are all distinct from each other. Screws are generally called wooden screws. It is the kind with a pointed tip at the tip, pitch.

It is larger, and is generally used for fastening wooden parts and plastic parts. The screw rod is a machine screw, which is the kind with a flat head at the front end, with a small and uniform pitch, and is generally used to fasten metal and machine parts.

Information and use of wrenches:

Manual wrenches, also known as ordinary wrenches, are mainly used in ordinary life and work, and their use is relatively simple, mainly divided into single-ended wrenches, double-ended wrenches, live wrenches, plum wrenches, multi-purpose wrenches, percussion wrenches, socket wrenches, socket drivers, and torque wrenches.

Torque wrenches, cross wrenches, ratchet wrenches.

Hook wrenches, Allen wrenches.

Inner quad wrenches, manual clutch torque wrenches, pipe wrenches, T-wrenches, L-wrenches, triprongs, crescent wrenches, oil drum wrenches, tire wrenches, spark plugs.

Wrenches, filter wrenches, combination wrenches, other wrenches, etc. Torque wrenches are divided into signal wrenches, pointer wrenches, and digital display wrenches.

According to the characteristics of the fastener to be tightened, the corresponding wrench is selected. Tighten, hold the end of the wrench handle with your hand and tighten firmly in a clockwise direction;Unscrew, rotate in a counterclockwise direction.

Hexagon wrench for M4 stop screws.

Allen wrench, its correspondence is S3 = M4, S4 = M5, S5 = M6, S6 = M8, S8 = M10, S10 = M12, S12 = M14-M16, S14 = M18-M20, S17 = M22-M24, Code Leg S19 = M27-M30, S24 = M36, S27 = M42.

Hexagon wrenches, commonly used open end wrenches are as follows:

The corresponding thread specifications are M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42

Hex wrench construction:

1. The hexagonal wrench has a working end with hexagonal holes or twelve angular holes at both ends, which is suitable for occasions where the working space is narrow and ordinary wrenches cannot be used.

2. According to its different structures, it can be divided into dull wrenches, plum wrenches, dual-purpose wrenches, socket wrenches, hook wrenches, hexagon wrenches, torque wrenches, and special purpose wrenches such as percussion wrenches.

3. The wrench is usually made of carbon structural steel or alloy structural steel. <>

An 8mm socket wrench is used for hexagon bolts, and a 16mm socket wrench is used for hexagon bolts for pants.

Expansion:

Metric hex bolt and socket (torx) wrench side size comparison table:

The bolt size corresponds to the wrench or socket opposite the side size.

m3m4 7mm

m5 8mm

m6 10mm

m8 13mm(14mm)

m10 16mm(17mm)

m12 18mm(19mm)

m14 21mm(22mm)

m16 24mm

m18 27mm

m20 30mm

m22 34mm

The dimensions in parentheses are GB old standard sizes.

Metric Allen Bolt and Allen Wrench Size Comparison Table:

Allen bolts correspond to the size of the Allen wrench.

M3 Hu Naheng.

m4 3m5 4

m6 5m8 6

m10 8m12 Min shirt 10

m14 12

m16 14

m18 14

m20 17

m22 17