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Home > products > Metal Bolt > Black M16 M20 Carbon steel Flat head Hexagon tapping screws Class8. 8 CSK screws

Black M16 M20 Carbon steel Flat head Hexagon tapping screws Class8. 8 CSK screws

Product Details

Place of Origin: China

Brand Name: JIA SHAN

Certification: ISO

Model Number: DIN, ASEM, ISO

Payment & Shipping Terms

Minimum Order Quantity: 100

Price: USD0.2/pcs-USD1/pcs

Delivery Time: 1-5 weekds

Payment Terms: T/T, Western Union

Supply Ability: Batch order abailable

Get Best Price
Highlight:
Usage:
Fastening
Size:
Various Sizes Available
Style:
Self Tapping Screws
Head Style:
Self Tapping Screws
Strength:
High
Finish:
Black
Manufacturer:
JIA SHAN Hardward Company
Length:
As Customisation
Package:
Small Packing+Carton Packing+Pallet
Standard:
DIN
Package Quantity:
100 Pieces
Shape:
Self Tapping Screws
Measurement System:
INCH, Metric
Port:
Shenzhen
Quality:
Inspection Before Shipment
Color:
As Customisation
Material:
Carbon Steel
Usage:
Fastening
Size:
Various Sizes Available
Style:
Self Tapping Screws
Head Style:
Self Tapping Screws
Strength:
High
Finish:
Black
Manufacturer:
JIA SHAN Hardward Company
Length:
As Customisation
Package:
Small Packing+Carton Packing+Pallet
Standard:
DIN
Package Quantity:
100 Pieces
Shape:
Self Tapping Screws
Measurement System:
INCH, Metric
Port:
Shenzhen
Quality:
Inspection Before Shipment
Color:
As Customisation
Material:
Carbon Steel
Black M16 M20 Carbon steel Flat head Hexagon tapping screws Class8. 8 CSK screws
Black M16 M20 Carbon steel Flat head Hexagon tapping screws Class8.8 CSK screws
Product Specifications
Attribute Value
Usage Fastening
Size Various sizes available
Style Self Tapping Screws
Head Style Self Tapping Screws
Strength High
Finish Black
Manufacturer JIA SHAN Hardward Company
Length As customisation
Package Small Packing+Carton Packing+Pallet
Standard DIN
Package Quantity 100 pieces
Shape Self Tapping Screws
Measurement System INCH, Metric
Port Shenzhen
Quality Inspection before shipment
Color As customisation
Material Carbon steel
Product Description
Black M16 M20 Carbon steel Flat head Hexagon tapping screws Class8. 8 CSK screws 0

Product Description:

  1. Ordinary self-tapping screws: The thread is 'self-tapping thread', also known as 'wide thread'. The surface is mostly plated.
  2. Self-cutting tapping screws: China's standard called 'self-tapping screws shaved end', the thread for the self-tapping thread or machine thread, cross groove is also 'H' type.
  3. Self-extruding tapping screws (self-tapping lock screws): Thread is generally machine thread, rarely use self-tapping thread.
  4. Self-drilling tapping screws (self-drilling screws): Self-drilling tapping screws thread, China, Germany and international standards for self-tapping thread.
  5. Metal drive screws (metal tapping screws): Metal drive screws thread for the multi-head, and with a certain helix angle of the special thread.
  6. Wallboard tapping screws (drywall nails): Wallboard white tapping screws for the trumpet head, cross groove (H-type), 60° tooth angle of the special thread.
  7. Fibreboard nails: Cross slot for Z-type, the surface treatment is mostly plating.
  8. Combination of self-tapping screws: Ordinary self-tapping screws combined with washers.
  9. Other self-tapping screws type: Including high and low teeth double lead self-tapping screws, coarse and fine teeth thread self-tapping screws, etc.
Applications

Although there are many types of self-tapping screws, they all have the following common points:

  • They are generally manufactured from carburised steel (99% of total production). They can also be manufactured from stainless steel or non-ferrous metals.
  • The product must be heat-treated. Carbon steel self-tapping screws must be carburised, and stainless steel self-tapping screws must be solution-hardened.
  • High surface hardness, good core toughness. That is, 'soft outside'. This is a major feature of the performance requirements of self-tapping screws.
  • The surface of the product requires surface protection treatment, generally plating treatment.
  • Cold heading process is adopted. Recommended high-speed cold heading machine and high-speed thread rolling machine production.
Class 8.8 Bolts

Class 8.8 bolts have higher strength than class 4.8 bolts. The number 8.8 represents its material strength grade, which provides greater tensile strength and torque tolerance than Class 4.8 bolts.

Class 8.8 bolts are usually used for some occasions that require large loads or important connections, such as the assembly of Bridges and large mechanical equipment. Class 8.8 bolts have high reliability and durability, which can ensure the fastness and safety of the connection.

Choice of Class 4.8 and Class 8.8 Bolts

In practical applications, appropriate grades of bolts should be selected according to specific engineering requirements and design requirements:

  • If the engineering structure does not have high strength requirements for bolts and the budget is limited, you can choose 4.8 class bolts.
  • For connections that need to withstand strong or heavy loads, class 8.8 bolts should be selected to ensure the safety and reliability of the connection.
Blackening Treatment

Blackening treatment has the following advantages:

  • Improved rust prevention: The protective film of iron tetraoxide on the surface inhibits the formation of red rust.
  • Less likely to flake off: Unlike plating, blackening is a surface treatment process that merely changes the surface of the part into a different substance.
Material Composition
No. C% Cr% Ni% Mo%
304 0.07 17.5-19.5 8.0-10.5 /
316 0.08 16.0-18.0 10.0-14.0 2.00-3.00
301 0.15 16.0-18.1 6-8 /
310 0.08 24-26 19-22 /
304L 0.03 18-20 8-12 /
316L 0.03 16-18 10-14 2-3
321 0.08 17-19 9-12 /
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Black M16 M20 Carbon steel Flat head Hexagon tapping screws Class8. 8 CSK screws 4