Stainless Steel Screws

Stainless Steel Screws are stainless steel screws, a commonly used fastener with good corrosion resistance and mechanical properties. Its main function is to connect and fix two or more parts, and it is widely used in construction, electronics, machinery, furniture and other fields.

Application:

Stainless Steel Screws can be used to fix metal sheets, plastic parts, wood, composite Materials, etc., suitable for indoor and outdoor construction, equipment assembly, automobile manufacturing, home appliance installation, furniture manufacturing, shipbuilding industry and fastening needs in high temperature and humid environments. Due to its excellent corrosion resistance, it is also widely used in marine, chemical and medical equipment.

Material:

Stainless steel screws are usually made of the following types of stainless steel:

304 stainless steel: common general grade, good corrosion resistance, suitable for most application scenarios

316 stainless steel: added molybdenum element, stronger resistance to chloride corrosion, suitable for seaside or chemical environment

410 stainless steel: high hardness, suitable for high-intensity load scenarios, but slightly inferior corrosion resistance

201 stainless steel: low price, suitable for non-critical connections with low requirements for rust prevention

Features:

Strong corrosion resistance

A dense passivation film is naturally formed on the surface of stainless steel screws. The main component is trivalent chromium oxide (Cr₂O₃), with a thickness of about 1.5~3 nanometers. Although it is extremely thin, it can effectively block the intrusion of corrosive media such as air, moisture, acid and alkali. In the neutral salt spray test (ASTM B117), 304 stainless steel screws can withstand salt spray corrosion for more than 720 hours, and 316 stainless steel can withstand more than 1000 hours. In contrast, ordinary galvanized carbon steel screws can only last for 24~96 hours.

Even if the surface is slightly scratched, the passivation film can automatically repair itself within minutes and restore its protective function. This "self-healing ability" makes stainless steel screws particularly suitable for seaside, high humidity, high salt spray, acid and alkaline environments, such as chemical plants, ship docks, sewage treatment equipment, etc.

High strength

Stainless steel screws have excellent mechanical properties. For example, the tensile strength of common 304 stainless steel reaches **≥520 megapascals (MPa), 316 material can reach ≥580 MPa**, and 410 martensitic stainless steel can even reach **≥750 MPa**. After cold working, its surface hardness can reach Rockwell hardness HRB 95~100, which is much higher than ordinary carbon steel screws (HRB 70~80).

At the same time, it has strong wear resistance, is not easy to deform or break, and can still maintain stable structural strength in high temperature (such as above 300°C) or low temperature (tens of degrees below zero) environments, which is very suitable for repeated disassembly and assembly, high load, continuous vibration and other working conditions.

Diversified specifications

Stainless steel screws have a full range of products, with regular sizes covering M1-M24 (metric) and #0-1/2 (imperial UNC/UNF) threads, and lengths ranging from 3 mm to 200 mm, meeting the assembly needs from micro-precision equipment to large structural parts.

There are rich head types, including cross head, slotted head, internal hexagon, external hexagon, plum head, anti-theft head, countersunk head, round head, pan head, flange head, etc., and the thread types can be coarse teeth, fine teeth, wood teeth, self-tapping teeth, self-drilling teeth, etc.

At the same time, it supports non-standard customization services, and customizes the parameters such as threads, head shapes, surface treatment, materials, etc. according to the customer's drawings or samples to meet the personalized needs of special Industries.

High aesthetics

Stainless steel has a natural metallic luster and a smooth and bright surface. Even without electroplating, it has a good decorative effect. The finished product can be further subjected to a variety of surface treatment processes such as wire drawing, mirror polishing, sandblasting, passivation, blackening, etc. to enhance the overall texture.

Its oxidation resistance and pollution resistance also make the appearance last as new, which is suitable for furniture, Lighting, electronic equipment housing, building curtain walls and other application scenarios with high requirements for appearance.

Environmentally friendly and non-toxic

Stainless steel itself does not contain heavy metals such as lead, cadmium, mercury, hexavalent chromium, etc., and complies with EU RoHS, REACH, PAHS and other environmental protection standards. It does not release harmful gases or dust and is harmless to the human body and the environment.

Therefore, stainless steel screws are widely used in food processing equipment, drinking water systems, medical devices, household appliances and other fields with strict requirements on hygiene and safety.

Easy to process

Stainless steel materials have good mechanical processing properties and are suitable for a variety of processing methods such as turning, milling, drilling, tapping, etc. The processing size is accurate, the thread strength is good, and it is not easy to break the teeth.

In addition, the screw design meets the needs of automated assembly and can be efficiently used on automatic tightening and batch production lines, effectively improving production efficiency and reducing assembly costs. It is especially suitable for industrial scenes that require batch assembly, such as the electronics manufacturing industry, the automotive industry, and machinery manufacturing.

Advantages:

Rust-proof and durable

Stainless steel screws can maintain excellent rust-proof ability in various harsh environments with their excellent corrosion resistance. This is mainly due to the stable passivation film formed on its surface, which can effectively prevent oxidation reactions even under extreme conditions such as high humidity, strong acid and alkali, and salt spray. Long-term use can still maintain the stability of appearance and performance, greatly reducing the replacement frequency and maintenance operations caused by screw rust, reducing the overall maintenance cost, and is particularly suitable for outdoor facilities, marine engineering, chemical equipment and other fields.

Widely used

Stainless steel screws can be firmly fastened on a variety of substrates such as wood, metal, plastic, and composite materials to meet the connection needs of various structural parts. Whether in daily home furnishings, Electrical appliance manufacturing, or high-end aerospace, rail transportation, and construction, stainless steel screws can do the job. It is also compatible with various complex environments such as indoor and outdoor temperatures, humidity, and pollution levels, so it is regarded as one of the most versatile industrial standard parts.

Safe and reliable

Stainless steel screws have high strength and excellent mechanical properties. They are not easy to break, slip or loosen. Even if they are in an environment of vibration, heavy pressure or temperature difference for a long time, they can stably perform the fastening function and ensure the overall safety of the equipment structure. Whether used for high-precision mechanical structures or heavy-load bearing connections, their excellent toughness and fatigue resistance can provide lasting safety protection for the system.

Economical and efficient

Although the purchase price of stainless steel screws is usually higher than that of ordinary carbon steel or galvanized screws, their excellent corrosion resistance, durability and low maintenance cost make their "total cost of use cycle" much lower than other types of screws. In many scenarios where frequent maintenance is required or it is difficult to replace screws, stainless steel screws are undoubtedly a more economical and efficient choice, helping companies control long-term costs while ensuring product quality.

Strong customizability

Stainless steel screws support customized services of various specifications, sizes and shapes to meet the diverse needs of different industries and personalized projects. Customers can choose different head shapes such as cross slot, internal hexagon, external hexagon, and plum head according to specific uses, and can also specify the thread type (metric, imperial, fine pitch, coarse pitch, etc.), length, diameter, and surface treatment (such as passivation, blackening, polishing, etc.). This makes stainless steel screws not only suitable for standardized large-scale use, but also very suitable for customized solutions under special working conditions, helping to improve the overall product performance and process matching.

FAQ:

Will stainless steel screws rust?

In most environments, they will not rust, but if they are exposed to extreme environments such as strong acids and alkalis, high salt content, or due to surface damage, crack corrosion, etc. for a long time, local rust may occur. It is recommended to choose 316 material and pay attention to the installation method.

Can Stainless Steel Screws be used outdoors or in humid environments?

Absolutely. Both 304 and 316 stainless steel screws have excellent rust resistance and are very suitable for applications such as outdoor buildings, gardening facilities, and marine equipment that are in humid environments for a long time.

What is the difference between stainless steel screws and ordinary carbon steel screws?

Stainless steel screws are corrosion-resistant and have a longer life, while carbon steel screws are cheaper but easy to rust and require additional electroplating. In situations where rust prevention and high aesthetics are required, it is recommended to use stainless steel screws.

How to avoid the phenomenon of stainless steel screws biting (cold welding)?

During installation, you can use anti-seizing paste, control the tightening speed, avoid high temperature and high speed friction, and use different materials such as 304 to 304 or 304 to 316 to reduce the probability of cold welding.

What are the common specifications of stainless steel screws?

Common ones include M2-M12 metric threads, UNC/UNF American threads, head types include round head, flat head, countersunk head, internal hexagon, external hexagon, etc., and thread length and surface treatment can also be customized according to needs.