All Categories
History
This section provides an overview for waterproof screws as well as their applications and principles. Also, please take a look at the list of 7 waterproof screw manufacturers and their company rankings. Here are the top-ranked waterproof screw companies as of December, 2024: 1.YUHUANG Electronic Technology Co., Ltd., 2.ZHUHAI JIALI HARDWARE CO.,LTD., 3.Suzhou Anzhikou Hardware Technology Co., Ltd..
Table of Contents
A waterproof screw has a waterproof shield ring attached to the seating surface (behind the head of the screw) to block water leakage.
Since there is a small gap between the screw's seating surface and the object to be fastened, it is an easy entry path for water and organic solvents. The shield ring of a waterproof screw is highly water-resistant and airtight, and can close the gap between the seating surface and the object to be fastened. This is why they are used to protect electronic circuit boards in home appliances from water splashes and to prevent rainwater from penetrating machinery used outdoors.
Waterproof screws are used to protect precision instruments and water-sensitive equipment from water immersion.
In particular, waterproof screws are indispensable for the following equipment:
If waterproof packing and screws are purchased separately, the size may not fit or the seal may be weak. Therefore, waterproof screws with a set of waterproof shielding rings are used.
Waterproof screws are designed to be exposed to water, so the main body (screw part) is made of rust-resistant SUS. A waterproof shield ring that matches the size of the body is attached to the seat (back side of the head), which serves to seal the gap between the screw and the object to be fastened.
The shield ring is generally made of nitrile rubber (synthesized by polymerization of acrylothrin and 1,2-butadiene). Nitrile rubber can withstand solvents such as gasoline and alcohol as well as water, and can be used to prevent the penetration of oil and grease. However, it is corroded by ethyl acetate and ether, so if resistance to these organic solvents is required, use fluoroplastic (PTFE).
The procedure for using waterproof screws is as follows:
This will seal the gap between the seat and the object to be fastened with the shield ring, preventing water from entering the equipment.
The main material used for waterproof screws are stainless steel.
As described in the section on proper use, the tightening torque should be carefully selected to obtain sufficient tightening due to the presence of the shield ring. Particularly when designing equipment where human lives are at stake, sufficient consideration should be given.
Electrical corrosion is also an important factor. If the material of the waterproof screws differs from the material of the mating mechanical element or the object to be fixed, a difference in metal potential may result in corrosion. Particular attention should be paid to aluminum and stainless steel.
The surface treatment of waterproof screws should be selected according to the corrosion countermeasures against electric corrosion mentioned above, the quality of appearance, and the price.
Waterproof screws are basically intended for use in areas that are exposed to water, such as external covers. If not used properly, the mating nut may be damaged, or the product or equipment assembled with the waterproof screws may be damaged.
To prevent this, the basic approach is as follows:
Even if waterproof screws are used properly, gradual loosening of waterproof screws can cause the object to be fastened to become dislodged, which may lead to a serious accident involving human life, depending on the object to be fastened.
Loosening can be caused by the following two factors:
Tightening waterproof screws strongly is effective in preventing loosening, but it can also cause waterproof screws to break or destroy the screw holes. Especially when designing equipment that involves human life, it is necessary to calculate the allowable range of tightening force, as described in the section on proper use of waterproof screws.
When retightening screws in purchased products, if there is already a defined tightening force regulation, it is sufficient to tighten the screws accordingly.
Another method to prevent loosening is to use a loosening adhesive.
Since the principle of anti-looseness is friction, it is actually difficult to guarantee that it will never loosen. Sufficient testing is also something to consider.
*Including some distributors, etc.
Sort by Features
Sort by Area
YUHUANG Electronic Technology Co., Ltd. is a Chinese manufacturer of precision screws and fasteners. Established in 1998, the company is based in Dongguan, China. Its main activity include the design, production, and distribution of precision screws and fasteners. YUHUANG has a strong presence with a wide range of products, hence it serves a number of industries such as electronics, automotive, and machinery. The company also offer customization on diverse product lines including standard screws, bolts, and nuts, that are dependable and usable.
Suzhou Anzhikou Hardware Technology Co, Ltd. is a manufacturer and supplier of custom precision screws and fasteners founded in Jiangsu, China. The company mainly produces precision screws, including micro screws, CD pattern screws, nylon patch screws, waterproof screws, and combination SEMS screws. It also offers other fasteners and screw accessories. These products are utilized in leather goods, precision machinery, door and window, electronic, and toy fields. The company has a 2,000-square-meter production facility with CNC machining, screw machines, and inspection equipment. It is ISO 9001:2015 certified and exports to over 40 countries.
Nok Corporation, founded in 1941 and based in Tokyo, Japan, is a manufacturer of several products, including sealing, rubber, and electronic products, and is part of the NOK Group. The company also makes flexible printed circuits (FPC), office automation equipment, and functional membranes, serving industries such as automobile, construction machinery, and electronic equipment. In 1960, the company expanded its production by constructing plants in Kumamoto, Fujisawa, and Shizuoka, and it was listed on the Tokyo Stock Exchange in 1961. In 1979, it was the first to set up a production base in the US before any Japanese automaker.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | YUHUANG Electronic Technology Co., Ltd. |
60.0%
|
| 2 | ZHUHAI JIALI HARDWARE CO.,LTD. |
20.0%
|
| 3 | Suzhou Anzhikou Hardware Technology Co., Ltd. |
20.0%
|
Derivation Method
The ranking is calculated based on the click share within the waterproof screw page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
Japan
|
3 | 60.0% |
|
China
|
2 | 40.0% |
23 products found
23 products
Musashi Oil Seal Industry Co., Ltd.
30+ people viewing
Last viewed: 13 hours ago
Fast Response
A seal washer is a washer that prevents leakage from the bolt part. Extremely high sealing performance can be expected as it completely prevents li...
TOCHIGIYA CO.,LTD.
20+ people viewing
Last viewed: 21 hours ago
■Features Waterproof lock handle. Since the key handle must be pushed and turned for locking and unlocking, there is no chance of the stopper turni...
Daimaru Screw Manufacturing Co., Ltd.
20+ people viewing
Last viewed: 1 day ago
■Features ・This one bottle has a leak prevention function. ・Excellent oil resistance, heat resistance, and weather resistance. - Excellent workab...
Tokyo Takukane Co., Ltd.
60+ people viewing
Last viewed: 1 minute ago
Asfa (R) WP" is a waterproof screw with a new concept that incorporates a flat washer in addition to the O-ring under the neck. Since the O-ring ca...
Musashi Oil Seal Industry Co., Ltd.
60+ people viewing
Last viewed: 1 day ago
Fast Response
■Summary A metal washer with baked rubber that prevents leakage from the bolt. A seal washer is a washer that prevents leakage from the bolt part. ...
Tokyo Hatsujo Manufacturing Co., Ltd.
60+ people viewing
Last viewed: 11 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
60+ people viewing
Last viewed: 12 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
50+ people viewing
Last viewed: 9 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
60+ people viewing
Last viewed: 13 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
60+ people viewing
Last viewed: 7 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
70+ people viewing
Last viewed: 3 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
60+ people viewing
Last viewed: 13 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
NITTOSEIKO CO., LTD.
10+ people viewing
Last viewed: 1 hour ago
Fast Response
4.0 Company Review
A new waterproof screw that incorporates an O-ring and flat washer. In addition to stable waterproof performance even when misaligned, it also enab...
Tokyo Hatsujo Manufacturing Co., Ltd.
70+ people viewing
Last viewed: 13 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
60+ people viewing
Last viewed: 8 hours ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Tokyo Hatsujo Manufacturing Co., Ltd.
70+ people viewing
Last viewed: 1 hour ago
Very Fast Response
Nippon Chemical Screw Co., Ltd. began selling polycarbonate screws in 1965, and continues to operate as Japan's only manufacturer specializing in p...
Hios Co., Ltd.
10+ people viewing
Last viewed: 1 day ago
Very Fast Response
■Main features - Highly airtight and waterproof, making it ideal for protecting electronic and precision equipment from getting wet. ・Since we are...
Azumaneji Co., Ltd.
40+ people viewing
Last viewed: 2 hours ago
■Water leak prevention screw (SEAL LOCK) If the fasteners come into contact with water, be careful of water leakage from the seat surface or thread...
Yoshikawa Shoko Co., Ltd.
20+ people viewing
Last viewed: 1 day ago
Yoshikawa Shoko Co., Ltd.
20+ people viewing
Last viewed: 1 day ago
Yoshikawa Shoko Co., Ltd.
10+ people viewing
Last viewed: 1 day ago
The new product, the stainless steel tile multi-screw for tile work, is a multi-type hex bit (8H) and cross bit (no. 2) that can be used for both h...
Yoshikawa Shoko Co., Ltd.
30+ people viewing
Last viewed: 1 day ago
Ideal for stopping the valleys of polycarbonate corrugated plates. Thin washer with small head φ8.5mm packing for fixing square corrugated steel pl...
Yoshikawa Shoko Co., Ltd.
10+ people viewing
Last viewed: 1 day ago
Ideal for stopping the valleys of polycarbonate corrugated plates. Thin washer with small head φ8.5mm packing for fixing square corrugated steel pl...
