TitleProduct

Grade 8 Socket Head Cap Screws

  • Price:

    Negotiable

  • minimum:

  • Total supply:

  • Delivery term:

    The date of payment from buyers deliver within days

  • seat:

    Fujian

  • Validity to:

    Long-term effective

  • Last update:

    2020-02-02 20:21

  • Browse the number:

    126

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Xiamen Xinhengjie Hardware Co., Ltd.
Contactaixin:

xinhengjie(Mr.)  

Email:

telephone:

phone:

Arrea:

Fujian

Address:

No. 257, Tong'an Garden, Industrial Concentration Zone, Tong An District, Xiamen City, Fujian Province.

Website:

http://www.xhj-screw.com/ http://xinhengjie.display-ad.net/

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Product Introduction

Stainless steel screws are widely used in machinery, petrochemical, telecommunications, chemical, construction, power, textile, sports equipment, paper, sewage, shipbuilding, automotive and other industries. With the improvement of domestic economic living standards, the application range of stainless steel screws will be more widely.


Product Parameters

Product name

High Strength Steel Thread Hex Head Screw

Product grouping

Self-tapping screws

Material

High Strength Steel, Stainless Steel, Carbon Steel

Types

Hexagon Head

Groove

Hexagon

Head style

Hexagonal

Standard

DIN, GB, ANSI, BSW, JIS

Performance level

12.9grade

Transport packaging

Small Box+Carton+Pallet or as Customer Request

Specification

M24*139

Trademark

Xinhengjie

Place of origin

Xiamen, China

Weight

425g

Heat treatment


Surface treatment

White zinc, blue white zinc, color zinc, black zinc, nickel, copper

Unit price (FOB)

2.24$

Minimum order quantity

50000Pcs

One day production

80000-150000PCS/day


Material Selection Principle

Stainless steel screw selection principle:

The choice of stainless steel materials is mainly considered from the following five aspects.

1. For stainless steel screw materials, especially in mechanical properties, especially strong

Degree requirements.

2. Requirements for the corrosion resistance of materials under working conditions.

3. The requirements of the working temperature on the heat resistance (high temperature strength and oxidation resistance) of the material.

4. Requirements for material processing performance in terms of production process.

5. Other aspects, such as weight, price, procurement and many other factors must be considered.


Magnetic

People often think that magnets adsorb stainless steel, verify its pros and cons and authenticity, do not absorb non-magnetic, think it is good, the goods are genuine; if the attractor is magnetic, it is considered a counterfeit fake. In fact, this is an extremely one-sided, unrealistic way of distinguishing mistakes. There are many types of stainless steel screws, which can be divided into several categories according to the structure at room temperature:

1. Austenitic type: such as 304, 321, 316, 310, etc.

2. Martensite or ferrite type: such as 430, 420, 410, etc.

The austenite type is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic.

Most of the stainless steels used for decorative tube sheets are austenitic 304 materials, which are generally non-magnetic or weakly magnetic. However, magnetic properties may occur due to fluctuations in chemical composition or processing conditions due to smelting, but this cannot be considered as Counterfeit or unqualified, what is the reason?

It is mentioned above that austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to segregation or improper heat treatment during smelting, a small amount of martensite or ferrite in austenitic 304 stainless steel is caused. Body organization. Thus, 304 stainless steel will have weak magnetic properties.

In addition, 304 stainless steel is cold-worked, and the microstructure is also transformed into martensite. The greater the cold work deformation, the more martensite transformation and the greater the magnetic properties of the steel. Like a batch of steel strips, it produces Φ76 tubes with no obvious magnetic induction and produces Φ9.5 tubes. Due to the large deformation of the bending, the magnetic induction is obvious. The rectangular tube produced is larger than the round tube, especially the angled part, and the deformation is more intense and the magnetic is more obvious.

In order to completely eliminate the magnetic properties of the 304 steel caused by the above reasons, the austenite structure can be restored by high-temperature solution treatment, thereby eliminating magnetic properties.

In particular, the magnetic properties of 304 stainless steel caused by the above reasons are not at the same level as the magnetic properties of other materials such as 430 and carbon steel. That is to say, the magnetic properties of 304 steel always show weak magnetic properties.

This tells us that if the stainless steel strip is weakly magnetic or not magnetic at all, it should be judged as 304 or 316 material; if it is the same as the magnetic steel, it shows strong magnetism, because it is judged not to be 304 material.


Product Application Scenario

Stainless steel screws are widely used in machinery, petrochemical, telecommunications, chemical, construction, power, textile, sports equipment, paper, sewage, shipbuilding, automotive and other industries. With the improvement of domestic economic living standards, the application range of stainless steel screws will be more widely.


FAQ

Q1: Can you provide samples?

A: For our regular products, we offer free samples. For customized bolts, tooling and proofing charges need. All free samples not including its courier charge.


Q2: How to ensure that every process's quality?

A: We implement strict ISO quality control, and have 8 steps checking in production .


Q3: What is the lead time of the product?

A: Generally 30-50 days after the deposit.


Q4: Where is you company?

A: Our company is lacated in Xiamen, Fujian, China.


http://www.xhj-screw.com/