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Din125 Din9021 Flat Washers

Product: Round flat washer
Standard: DIN125 DIN9021
Raw material: Carbon steel stainless steel .
Surface: Plain Black Zinc plated HDG Teflon, Geomet, Dacromet, Phosphating, etc..
Specification Range: M3-M100 customized products are available
Hardness: HV100, HV 200–300, HV 300–350, HV 430–530, HRC 26–45

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Product Introduction

Core Info

product-680-296

product-1201-394

product-1201-400

Product Overview

Flat washers (or flat gaskets) are essential auxiliary fasteners for mechanical assemblies, featuring a flat annular structure. Designed to pair with bolts, screws, and other threaded connectors, they comply with international/national standards like DIN 125, ISO 7089, and GB/T 97.1. Core functions include load distribution, surface protection, gap adjustment, and anti-loosening. Widely used in machinery, electronics, construction, and automotive industries, they excel in scenarios with hardness differences between connectors and workpieces, flat assembly spaces, or demands for stable connections.

Key Specifications

Raw Materials

Carbon steel (Q235, 1010, 1020): Cost-effective for general loads and dry environments;

Stainless steel (304/A2, 316/A4): Corrosion-resistant, ideal for humid/acid-alkaline conditions;

Copper alloy (brass, red copper): Conductive and corrosion-resistant, for electronics/electrical equipment;

Aluminum alloy: Lightweight and corrosion-resistant, suitable for lightweight assemblies;

Non-metals (rubber, silicone, PTFE): Sealing/insulating, for special media or insulation needs.

Surface Treatments

Plain, zinc plated, black oxide, hot-dip galvanizing (H.D.G), Dacromet, nickel plated, chromium plated.

Specification Range

Metric:

Inner diameter M1.6–M56, thickness 0.3mm–6mm (outer diameter matches bolts);

Imperial:

Inner diameter 1/4"–2", thickness 0.012"–0.25" (compatible with imperial threads).

Property Classes

Carbon steel:

General grade (4.8/5.6 bolts) and enhanced grade (8.8+ high-strength bolts);

Stainless steel:

A2-70, A4-70 (paired with stainless steel bolts);

Non-metals:

Graded by temperature/pressure/medium resistance.

Core Characteristics

Evenly distributes bolt pressure to avoid workpiece damage;

Protects surfaces from scratches during tightening (ideal for soft materials);

Compensates for assembly gaps for stable connections;

Versatile materials/specifications for diverse needs;

Easy to install without special tools.

Application Fields

Machinery/equipment (motors, pumps, machine tools), automotive (body, engine, chassis), electronics/instruments (circuit boards, precision devices), construction (steel structures, pipelines), home appliances/daily necessities.

Usage Precautions

Choose matching inner diameter (outer diameter fits assembly space);
Select materials/coatings based on environment (e.g., 316 stainless steel/Dacromet for corrosion);
Install flat (avoid tilting/multi-layer stacking);
Regularly inspect for deformation/rust/aging (replace if damaged);
Do not use mismatched/unqualified washers or inappropriate types for harsh conditions.

Sales & Logistics

Markets:

North America, Europe, Asia-Pacific, and global industrial hubs;

Packaging:

Small bags, cartons, pallets (customizable);

Orders:

Accepts bulk and small-batch purchases (negotiable delivery terms).

Quality Assurance

ISO9001:2015 certified; all products undergo dimensional and performance testing;
Provides long-term quality guarantees and technical after-sales support.

FAQ: Key vs. Spring Washers what's the difference ?

Aspect	Flat Washers	Spring Washers
Function	Load distribution, surface protection, gap adjustment	Anti-loosening + buffering
Structure	Flat annular (simple)	Spiral (elastic)
Application	General scenarios (often paired with spring washers)	Vibration/shock-prone environments
Materials	Diverse (including non-metals)	Mainly carbon steel/stainless steel

Established in 2005, our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide