Industry solutions for high-strength screws and nuts fasteners on explosion-proof electrical equipment

Industry solutions for high-strength screws and nuts fasteners on explosion-proof electrical equipment

For explosion-proof equipment (explosion-proof cheerful pressure cabinets, electrical cabinets, cabinets, explosion-proof distribution boxes), screws and nuts, blind riveting nuts, and blind rivets fasteners are usually an essential part of maintaining the integrity of its explosion-proof type, especially explosion-proof "d" and some dust explosion-proof equipment, etc. must be used for special fasteners, which play a role in fastening the explosion-proof joint surface or to maintain the enclosure sealing is essential to ensure the integrity of the explosion-proof type. They play a role in fastening the explosion-proof joints or maintaining the sealing of the shell to ensure the integrity of the explosion-proof type, which is essential. If the pitch of the fasteners, tolerances, and other substandard, it is easy to fall off, lose, and other issues, thus affecting the explosion-proof performance of the equipment and the formation of safety hazards. Therefore, explosion-proof equipment should be selected to meet the requirements of the explosion-proof standard and through the test to verify the fasteners, and can only be replaced with the same fasteners.

Explosion-proof products, high-strength screws, high-strength nuts, and other fasteners play an essential role; we all know that explosion-proof electrical equipment is used for the explosion-proof shell to perform explosion-proof; if the fasteners out of any problem, then the explosion-proof shell with joint will not be a good match, but instead of gaps or other situations, then the explosion-proof products have lost the significance of the explosion-proof. Hence, the fasteners play an essential role in explosion-proof products. So fasteners play a crucial role in explosion-proof products.

Explosion-proof shell fastening bolt design mainly from the bolt strength, cast aluminum shell threaded tooth strength, bolt preload torque calculation, bolt loosening, and precision design.

High-Strength Grade 8.8 Steel Hex Head Screws： Made from Grade 8.8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Grade 8 steel hex head screws are marked with six radial lines. Length is measured from under the head.

Alloy Steel Ultra-Low-Profile Socket Head Screws: Made from alloy steel, these screws are nearly twice as strong as stainless steel ultra-low-profile screws. Their black-oxide finish provides mild corrosion resistance in dry environments. To fit in the tightest spaces, they have a head that's one-third the height of a standard socket head, but their low profile weakens their head. They are not recommended for critical fastening applications. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don't know tdon'ttch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.

18-8 Stainless Steel Low-Profile Socket Head Screws: Nearly as strong as steel, these stainless steel screws won't rust won'ttdoor, wash down, and other corrosive environments. With half the height of a standard socket head, these low-profile screws fit in tight spaces but are weaker than standard socket heads. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don't knowthdon'tchh or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.

DIN screws meet international standards for materials and dimensions.

Tighten DIN 6912 screws with DIN 6911 L-keys—these screws have a recess that matches the extended tip of those L-keys. DIN 6911 L-keys grip these screws snugly so you can install them in difficult-to-reach areas with just one hand. You can also install DIN 6912 screws with standard L-keys, but they won't grip the wants as securely.

Alloy Steel Thread-Locking Socket Head Screws: With a tensile strength of 170,000 psi, these alloy steel screws are more robust than Grade 8 steel screws and are nearly two and a half times stronger than stainless steel thread-locking screws. Their black-oxide finish provides mild corrosion resistance in dry environments. A nylon patch bonded to the threads adds friction to resist loosening from vibration. Screws are reusable, but their holding power lessens with each use. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don't know the pitch or the threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.

Screws that meet ASTM A574 comply with specifications and testing requirements for material quality. Screws that meet ASME B18.3 and ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

JIS Medium-Strength Steel Hex Head Screws: Made to Japanese Industrial Standards, these Class 8.8 steel screws are suitable for fastening most machinery and equipment. The zinc yellow-chromate plating resists corrosion in wet environments. Length is measured from under the head. Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don't know the pitch. Fine threads are closely spaced to prevent loosening from vibration.

Please contact our team if you need high-quality steel hexagonal head screws with more detailed specifications and related information.

Email:adelajonly@gmail.com,www.juxinfasteners.com.

Zinc yellow-chromate plated steel screws resist corrosion in wet environments.

Zinc-flake-coated steel screws are about five times as corrosion resistant as zinc yellow-chromate plated screws and have good resistance to salt water and acids. They are also known as ultra coats and armor coats. To maintain corrosion resistance, use these screws with zinc-flake-coated nuts and washers.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don't know the threads per inch.

Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.

Screws that meet ASTM A354BD or SAE J429 comply with specifications and testing requirements for material quality.

Screws that meet ASME B18.2.1 or ASME B18.6.3 comply with specifications for dimensional standards.

High-Strength Metric Class 10.9 Steel Hex Head Screws： Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Dimensions meet ISO (formerly DIN) or DIN specifications. Length is measured from under the head.

Steel screws should be used in dry, noncorrosive environments. Zinc yellow-chromate plated and zinc-plated steel screws resist corrosion in wet environments. Blue-dyed screws are easy to distinguish. Black corrosion-resistant coated steel screws resist chemicals and withstand 1,000 hours of salt spray. To maintain corrosion resistance, use these screws with black ultra-corrosion-resistant-coated nuts and washers.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don't know the pitch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.

1. Strength: Selection of appropriate strength fasteners to ensure that the shell withstands the pressure of the explosion so that it does not fall off and

2. Blind holes: bolts without washers screwed into the shell wall blind holes, the bottom of the hole to retain at least one buckle of margin;

3. Protection: fasteners with spring washers, flat washers, countersunk holes, etc;

4. Torque: The tightening torque should be specified in the document, and the installation should be carried out according to that value.

5. Outside assembly:

(1) Hexagonal sockets: They must be tightened so that they protrude from the screw holes.

(2) Type I equipment: the head is protected by a圀 or countersunk hole or by the interior of the equipment.

(3) Class II equipment: Fastener holes must have a thread depth of h that allows thread engagement at least equal to the outside diameter of the fastener threads.

6. Material requirements: plastics and light alloys are not permitted.

7. Other requirements:

(1)Doors or covers fixed with threads should be additionally fixed with the help of hexagon socket set screws or equivalent methods; (2)Double screws should be fixed with the help of hexagon socket set screws or equivalent methods.

(2) Double-head screws shall be securely fastened and permanently fixed to the shell by fusion welding or riveting, or other equivalent methods; (3) Fasteners shall be fixed with the aid of hexagonal set screws or comparable techniques.

(3) Fasteners should not penetrate the wall of the explosion-proof shell unless they form an explosion-proof bond with the shell wall and the shell is not separable

(4) When bolts without washers are fully screwed into blind holes in the wall of an explosion-proof enclosure, the bottom of the holes shall be maintained with at least one total thread allowance; and

(5) For screw holes or double-headed bolts that do not penetrate the wall of the explosion-protected enclosure, the remaining thickness of the wall of the explosion-protected enclosure shall be at least 1/3 of the diameter of the bolt or double-headed bolt, with a minimum of 3 mm.

Explosion-proof electrical cabinets and distribution box shells generally have two types: flat and stop. The bolt plays a role in fastening and ensures plane clearance for the plane structure. For stop structure, when the explosion-proof surface only considers the cylinder part, the bolt only plays a fastening role while ensuring that the plane part is of the gap. When tapping threads directly on the shell should be noted that the fastener screw holes try not to pass through the shell of the explosion-proof, through the shell when the bottom of the screw holes should be left more than a 3mm margin, in the use of aluminum alloys and other light alloy materials to do the shell of the explosion-proof, due to the aluminum alloy strength is low, so it is necessary to often open (such as the replacement of the light source needs to be opened) of the shell of the explosion-proof fastening screws should not be used in the aluminum alloy shell of the direct tapping threads with the By pre-buried anti-loosening internal and external threaded steel sleeve to increase the strength of the screw hole and prevent failure due to thread rot. Do not open factory-installed bolts when the user replaces the light source or maintenance, it can be tapped directly on the shell fastening screw holes, but can not use fine threads; try to use coarse threads, and there are enough engaging buttons to meet the fastening requirements. In the design of shell fasteners, the first thing to distinguish is the role of the explosion-proof shell. Does it only play a role in fastening, or does both play a role in fastening and also play a role in ensuring the plane clearance? Then, confirm the maximum axial load of the bolt to choose the correct bolt.