English
  • Hongji

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji Featured Image
  • Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji
  • Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji
  • Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji
  • Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji
  • Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji

Short Description:


Product Detail

Product Tags

Related Video

Feedback (2)

We pursue the management tenet of "Quality is remarkable, Company is supreme, Name is first", and will sincerely create and share success with all clientele for Hex Socket Head Cap Screws , 10mm Hex Screw , Stud Bolts , With advantage of industry management, the company has always been committed to supporting customers to become the market leader in their respective industries.
Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji Detail:

Description

QUICK Response

QUICK Quotation

QUICK Delivery

READY TO SHIP DELIVERY

10000+ SKU in warehouse

We Commit for RTS items:

70% items delivered within 5 days

80% items delivered within 7 days

90% items delivered within 10 days

Bulk orders, please contact customer service

Hex socket countersunk screw ZP 8
Hex Socket Flat Head Screw Drawings

d M3 M4 M5 M6 M8 M10 M12 (M14) M16 (M18) M20 (M22) M24
P Pitch 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3
α tol.(+2) 90° 90° 90° 90° 90° 90° 90° 90° 90° 90° 90° 60° 60°
b L≤125mm 12 14 16 18 22 26 30 34 38 42 46 50 54
125＜L ≤ 200 / / / 24 28 32 36 40 44 48 52 56 60
L＞200 / / / / / 45 49 53 57 61 65 69 73
dk Max=Nominal 6 8 10 12 16 20 24 27 30 33 36 36 39
Min 5.7 7.64 9.64 11.57 15.57 19.48 23.48 26.48 29.48 32.38 35.38 35.38 38.38
ds Max=Nominal 3 4 5 6 8 10 12 14 16 18 20 22 24
Min 2.86 3.82 4.82 5.82 7.78 9.78 11.73 13.73 15.73 17.73 19.67 21.67 23.67
e Min 2.3 2.87 3.44 4.58 5.72 6.86 9.15 11.43 11.43 13.72 13.72 16 16
k Max 1.7 2.3 2.8 3.3 4.4 5.5 6.5 7 7.5 8 8.5 13.1 14
s Nominal 2 2.5 3 4 5 6 8 10 10 12 12 14 14
Min 2.02 2.52 3.02 4.02 5.02 6.02 8.025 10.025 10.025 12.032 12.032 14.032 14.032
Max 2.1 2.6 3.1 4.12 5.14 6.14 8.175 10.175 10.175 12.212 12.212 14.212 14.212
t Max=Nominal 1.2 1.8 2.3 2.5 3.5 4.4 4.6 4.8 5.3 5.5 5.9 8.8 10.3
Min 0.95 1.55 2.05 2.25 3.2 4.1 4.3 4.5 5 5.2 5.6 8.44 9.87

Detail description

hex socket countersunk screw 11
Hex socket countersunk screw ZP 3

High strength fasteners will produce crispness when galvanized.  Need special attention.

Hydrogen embrittlement is usually characterized by delayed fracture under stress.  There have been automobile springs, washers, screws, sheet springs and other galvanized parts, in a few hours after assembly has been broken, the fracture proportion of 40% ~ 50%.  In the process of using cadmium-plated parts of a special product, there was batch crack fracture, and a national key problem was solved and a strict dehydrogenation process was formulated.  In addition, there are some hydrogen embrittlement does not show delayed fracture phenomenon, such as: electroplating hanger (steel wire, copper wire) due to many times of electroplating and pickling plating, hydrogen penetration is more serious, often appear in use a fold will occur brittle fracture phenomenon;  The mandrel of a shotgun, after several times of chroming, fell to the ground and broke;  Some quenched parts (large internal stress) will crack when pickling.  These parts are severely hydrogenated and crack without external stress, which can no longer be used to restore the original toughness by dehydrogenation. 

The higher the material strength, the greater the hydrogen embrittlement sensitivity. This is a basic concept that must be clarified by surface treatment technicians when compiling electroplating process specifications.  Steels with tensile strength σb>105kg/mm2 required by international standards should be subjected to pre-plating stress and post-plating dehydrogenation treatment accordingly.  The French aviation industry requires corresponding dehydrogenation treatment for steel parts with yield strength σs>90kg/mm2. 

Due to the good correspondence between steel strength and hardness, it is more intuitive and convenient to judge the hydrogen embrittlement sensitivity of material by hardness than by strength. Because a perfect product drawing and machining process should be marked with steel hardness. In the electroplating, we found that the hardness of steel around HRC38 began to show the risk of hydrogen embrittlement fracture. For parts higher than HRC43, dehydrogenation should be considered after plating. When the hardness is about HRC60, dehydrogenation treatment must be carried out immediately after surface treatment, otherwise the steel parts will crack within a few hours.

Packing

Packaging and delivery
Packaging and delivery1
Packaging and delivery2
Packaging and deliver3
Packaging and delivery4
Packaging and delivery3

About us

Yongnian Hongji
ce3
cer2
ce1
ce6
ce5
ce4

* The following diagram identifies the different trade incoterms. Please select the one you prefer.

Yongnian Hongji1

Product detail pictures:

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji detail pictures

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji detail pictures

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji detail pictures

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji detail pictures

Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji detail pictures

Related Product Guide:
Like a result of ours specialty and repair consciousness, our enterprise has won a superb popularity amid buyers everywhere in the environment for Factory Supply Screw Tnut - DIN7991 Hex Socket Countersunk Screw Grade Carbon Steel Zinc Plated Grade 8.8 10.9 – Hongji , The product will supply to all over the world, such as: Cologne, Norway, Honduras, Relying on superior quality and excellent post-sales, our products sell well in America, Europe, the Middle East and South Africa. We are also the appointed OEM factory for several worlds' famous products brands. Welcome to contact us for further negotiation and cooperation.
    • The factory has advanced equipment, experienced staffs and good management level, so product quality had assurance, this cooperation is very relaxed and happy!
    5 Stars By Janet from Belgium - 2017.11.01 17:04
    Although we are a small company, we are also respected. Reliable quality, sincere service and good credit, we are honored to be able to work with you!
    5 Stars By Dee Lopez from Jakarta - 2017.04.28 15:45
    Write your message here and send it to us

    HOT-SALE PRODUCT

    Quality First, Safety Guaranteed