High reputation Steel Bolt - DIN6921 Serrated Head Flange Bolt Stainless Steel 304 316 – Hongji
High reputation Steel Bolt - DIN6921 Serrated Head Flange Bolt Stainless Steel 304 316 – Hongji
High reputation Steel Bolt - DIN6921 Serrated Head Flange Bolt Stainless Steel 304 316 – 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
| 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
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
About us
* The following diagram identifies the different trade incoterms. Please select the one you prefer.
Product detail pictures:
Related Product Guide:
Gaining purchaser gratification is our company's aim eternally. We're going to make great initiatives to create new and top-quality products, satisfy your exclusive prerequisites and supply you with pre-sale, on-sale and after-sale solutions for High reputation Steel Bolt - DIN6921 Serrated Head Flange Bolt Stainless Steel 304 316 – Hongji , The product will supply to all over the world, such as: Albania, Wellington, Palestine, During in 11 years, We have participated in more than 20 exhibitions, obtains the highest praise from each customer. Our company has been devoting that "customer first" and committed to helping customers expand their business, so that they become the Big Boss !
By Christopher Mabey from Southampton - 2018.12.11 11:26
The customer service reprersentative explained very detailed, service attitude is very good, reply is very timely and comprehensive, a happy communication! We hope to have a opportunity to cooperate.
By John biddlestone from Sudan - 2017.09.26 12:12
HOT-SALE PRODUCT
Quality First, Safety Guaranteed
