Galvanized Washers

Galvanized washers are metal gaskets with a galvanized surface, primarily used to enhance corrosion and rust resistance and extend service life. They are suitable for humid and corrosive environments, such as outdoor construction, shipbuilding, and automotive applications. The galvanized layer effectively isolates the substrate from corrosive media, making galvanized washers a commonly used anti-corrosion fastener component. Wanzhi Steel offers a full range of washers in various shapes and sizes, and accepts customization and coating treatments. If you are interested, please contact us.

Specification

Item	Galvanized washers
Place of Origin	Hebei, China
Surface Treatment	Galvanized, white zinc, color zinc, hot-dip galvanized
Zinc Plating Type	Electro-galvanizing, hot-dip galvanizing
Standard	DIN 125, DIN 9021, DIN 440, DIN 6916, USS, SAE, ISO, ANSI, JIS, GB, etc.
Thickness	0.3mm to 12mm
Grade/Hardness	Standard grades (such as 4.8 grade carbon steel washers), or HV100, HV200, HV300, etc.
Style/Type	Flat washers, spring washers, internal/external toothed/conical/clamping washers, self-locking washers (double fold DIN 25201), etc.
Shape	Round, square, irregular shape
MOQ	≥ 20,000 pieces
Sample	Free Available
Price Item	FOB, CIF, EXW, CFR, etc
Package	Plastic bags + cardboard boxes, or as per customer requirements.

Features and advantages

• Superior Corrosion and Rust Resistance: The dense zinc layer formed on the gasket surface through electro-galvanizing or hot-dip galvanizing provides excellent corrosion resistance and significantly extends service life.
• Pressure Distribution: Increases the stress-bearing area, preventing bolt/nut heads from sinking into the connected materials.
• Reduced Friction: Provides a smooth bearing surface.
• Loosening Prevention and Vibration Resistance: Self-locking washers (such as DIN 25201) or toothed washers effectively prevent loosening of connections due to vibration.
• Gap Filling: Compensates for unevenness in the connection surface, enhancing sealing.

Application areas

• Building Facilities: Steel structure factory buildings, bridges, guardrails, and pipe support connections and fastening.
• Vehicles and Ships: Vehicle assembly, chassis components, motorcycles, and ship parts.
• Heavy Machinery: Mining machinery, agricultural machinery, engineering equipment, and conveyor belt systems.
• Furniture and Decoration: Outdoor furniture, metal frame assembly, and interior decoration fixing.
• Electrical and Telecommunications: Electrical cabinets, cable trays, insulator fixing, and specialized insulating nails with self-locking washers.
• Industrial and Manufacturing: Production line equipment, server racks, warehouse shelves, and water pumps and valves.

Mechanical Performance Level

This is the most commonly used strength marking system for carbon steel fasteners (bolts, nuts, washers), mainly based on the ISO 898-1 international standard.

Meaning Analysis

1. Grade 4.8:

“4” = 1/100 of nominal tensile strength (N/mm²) → 400 N/mm²;

“.8” = 10 times the yield strength ratio (yield strength/tensile strength) → 0.8 → Yield strength = 400 × 0.8 = 320 N/mm²

Hardness Range

What does HV mean?

Hardness is an indicator of a material’s resistance to localized indentation, crucial for the deformation resistance of washers.

• HV: Abbreviation for Vickers hardness. A method of calculating hardness by pressing a diamond indenter into the material surface and measuring the diagonal length of the indentation.

The HV value measures whether a washer will excessively deform, flatten, or embed in soft material under bolt preload. The higher the number, the harder the material.

• HV100-150: Softer, used in general applications, low cost.
• HV200-250: Medium hardness, general industrial grade, suitable for 8.8 grade bolts.
• HV250-300+: High hardness, used in heavy-duty, high preload applications, suitable for 10.9/12.9 grade bolts.

 

Relationship between grade and hardness

• 4.8 grade: Recommended gasket hardness range HV100 – HV180, low carbon steel (Q235) with galvanizing or blackening treatment recommended.
• 8.8 grade: Recommended hardness range HV180 – HV250, medium carbon steel (35#, 45#), tempering + galvanizing.
• 10.9 grade / 12.9 grade: Recommended hardness range HV250 – HV350+, medium carbon alloy steel (40Cr, etc.), quenching and tempering + galvanizing/Dacromet coating.

Common Sizes of Galvanized Washers

Nominal specifications (thread size)	ID (mm)	OD(mm)	Thickness (mm)
M4	4.3	9	0.8
M5	5.3	10	1.0
M6	6.4	12	1.6
M8	8.4	16	1.6
M10	10.5	20	2.0
M12	13.0	24	2.5
M16	17.0	30	3.0
M20	21.0	37	3.0
Note: These are standard sizes; all sizes can be customized. Inner diameters range from M1.6 to M64 and larger, as well as non-standard outer diameters and thicknesses are available.

Main Types of Washers

1. Galvanized flat washer: A flat, circular ring with a hole in the center. The simplest structure, used to reduce friction, distribute pressure, and fill gaps.

2. Galvanized spring washer: A ring with a beveled cut, shaped like a spring. Prevents loosening and provides shock absorption, utilizing elastic tension to provide continuous restoring force.

3. Galvanized internal toothed washer: Features a sharp, upward-curved serration on the inner side. The serrations embed into the bolt head and the surface of the connecting parts, preventing loosening and rotation.

4. Galvanized external toothed washer: Features a sharp, downward-curved serration on the outer side. The serrations embed into the nut and the surface of the connected parts, while providing a certain spring tension, preventing loosening and rotation.

5. Galvanized tapered washer: Has a tapered (or wedge-shaped) cross-section. Used to compensate for angular deviations, providing a flat bearing surface when the bolt shaft is not perpendicular to the connected surfaces.

6. Galvanized combination washer: A flat washer and a spring washer (or toothed washer) pre-assembled into a single component. Simplified installation, combining anti-loosening and pressure-dispersing functions.

7. Galvanized self-locking washers: Locking is achieved through the frictional force generated by metal deformation or the compressive resistance of the nylon ring.

• Double-fold type – the washer is pressed into a two-piece, fitted structure with raised sections.
• Nylon embedded type – a nylon ring is embedded in the inner hole of the washer.

Other Corrosion-Resistant Material Washers

Besides galvanized washers, there are many other common metal washers made of different materials, which are also one of our main product categories.

1. 304/316 Stainless Steel Washers: These have extremely strong corrosion resistance and are usually passivated to enhance the surface. Used in highly corrosive environments such as food processing, chemical manufacturing, and coastal areas.

2. Copper/Brass Washers: These have good conductivity and corrosion resistance, and are commonly used for electrical connections and magnetic field shielding. The surface may be polished or passivated.

3. Aluminum Washers: These are lightweight and have some corrosion resistance. Commonly used in aerospace, electronics, and lightweight structures. The surface is often anodized.

Package

Galvanized gasket manufacturer – Wanzhi Steel

We integrate manufacturing and trade, possessing a mature supply chain and capable of producing everything from standard to non-standard parts.

• Production utilizes advanced CNC stamping/punching equipment, ensuring precise dimensions and strict tolerance control, conforming to international standards.
• Diverse materials and processes are available, including galvanized carbon steel, stainless steel, aluminum, brass, and copper. We support various surface treatments and special processing, such as welding and tapping.
• Customization services: We support OEM/ODM, production according to drawings, branded packaging, etc., flexibly responding to your needs.
• Samples can be mailed for your testing and verification. With extensive export experience and an annual production capacity of 300,000 tons, we can deliver on time even for large orders.

 

Get samples or a bulk quote! Chat with Us Online,

or send an email to: info03@wanzhisteel.com

 

 

Wanzhi Steel is an ISO 9001-certified steel factory located in Hebei, China. It has been specializing in the production of  Copper Crush Washer, Common nails, Duplex nails, Roofing nail, Galvanized bolts, Coil nails, and Stainless Steel Anchor Bolts for 14 years, with a monthly output of 1,800 tons. With high-quality products and good services, its products have been exported to more than 120 countries around the world.

 

 

Leave Us A Message