DIN7504 Hex Washer Lange Head Self Drilling Screw

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Product Description

Product Name

DIN7504 Hex Washer Lange Head Self Drilling Screw

Material

Carbon Steel, Stainless Steel 201/ 304/ 316  or others.

Size

8#-18*13 ~  14#-14*125

Standard Model

DIN ANSI JIS ASTM

Min Order

1000piece/ pieces


Packaging & Shipping

Packing

Inner Box + Carton Box + Pallet or Under Your Requirement

Supply capacity

10000000 piece/ pieces per month

Delivery time

5~20  days after deposit

Export market

Asia, America, Europe, Africa, markets.


Our Services

1. Reliable Supplier

2. High Quality

3. Standard Producing Technology

4. Competitive Factory Price

5. Fast Delivery


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Q:Who knows who invented the screw?
Greek mathematician Archimedes invented the thread, but until the 15th century only appeared the first screw, do not know who is its inventor. 1550 years with wood screws, until 1774 only invented a screwdriver. In 1936, Henry M. Philips applied for a patent for the screws of the crosshead head
Q:What is a self-tapping nail? Is it used? What are the characteristics of the shape? What is the difference with ordinary screws?
Self-tapping screw head shape with round head, flat head, semi-countersunk head and countersunk head and so on. Materials generally carburized steel, heat treatment after the surface hardness of not less than 45HRC.
Q:What is the damage to the mouth of the screw?
Screw nail head in the outside with a saw saw a word and then a word screwdriver out ,,, in the inside, with a drill to him to drill
Q:Specific conditions for use of spring washers
The inner tooth elastic washer and the outer tooth elastic washer circle are provided with a plurality of sharp elastic teeth which are pressed on the supporting surface, which can prevent the loosening of the fastener. The inner tooth elastic washer is used for the screw head with smaller head size. The elastic washer with teeth is smaller than the ordinary spring washer, and the fastener is even and reliable to prevent the looseness. Wave spring washers GB: GB/T 7246-1987 wave washers are divided into WG, WL type and WN type WG type WG type wave washer: wave washers for open type elastic washer, it usually can be installed in a small space, such as to reduce bearing prestress bearing running noise, improve the operation accuracy and stability of bearing there are also applications.
Q:How does the screw rust die?
Drop a few drops of oil or gently knock around a few times, to the rusty screw drops (to bubble better) gasoline or kerosene, washing the use of oxalic acid also
Q:Would like to know the role of flat washer?
In simple terms, the fastener medium has mainly above the washer, sealing, decompression, increase friction damping, fixed five role.
Q:What is the effect of the screw?
Screws are also called screws, and the screws can be divided into three categories: machine screws, set screws and special purpose screws.
Q:Why the screw thread more closely, spin into the more effort?
Because the length of the screw into a certain, do a certain job. The more tight the thread, the equivalent of the longer the distance rotation, power = distance × force, long distance, the need for force naturally small
Q:how to use Motor washer
Halo, brother, your question also detailed ah, there are a lot of places on a motor washer ah, do you mean where ah, you have to iron or plastic washers, spring washers, I think it is the plastic washer, mainly plastic washer 1 are leak proof, waterproof, anti oil,... 2 insulation, high pressure resistance, 3, vibration reduction, 4, reduce wear, basically on these several functions
Q:Screw hole slip wire how to do?
Can be in the original screw hole at the larger screw hole to cover the original screw hole, the most good new hole diameter is greater than the original hole diameter; 2. If the original thread hole has no space, then just change to other places to re- drilling

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