Products

Product Overview

A saddle washer—also referred to as an M‑shaped spring washer, double‑curved lock washer, or GB/T 860 saddle elastic washer—is a specialized fastening component with a distinctive saddle‑like contour on both sides. Its unique geometry features two opposite curvatures, creating two contact points on the mating surface. This design provides superior axial preload and vibration absorption compared to standard flat or single‑curved washers.

Saddle washers are primarily designed to prevent bolts or nuts from loosening while reducing vibration and noise in equipment. Their unique saddle‑shaped structure and elastic design make them highly effective in various complex working conditions, significantly enhancing the stability and service life of machinery.

How It Works

When a saddle washer is compressed between a bolt head or nut and the workpiece, its M‑shaped profile flattens elastically. The two arched sections generate a distributed thrust load that maintains bolt preload, compensates for thermal expansion and joint settlement, and actively resists rotational loosening. Unlike standard curved washers (single arch), the saddle washer provides higher load capacity at the same deflection while offering improved resistance to side‑to‑side movement.

Material Specifications

Surface Finishes Available:

• Plain (as‑manufactured)

• Zinc Plated (blue‑white / yellow zinc)

• Dacromet / Geomet (high corrosion resistance)

• Black Oxide / Black Phosphate

• Hot Dip Galvanized

Key Features

• Superior Vibration Damping – M‑shaped dual‑arch design provides two independent spring arms for enhanced energy absorption and noise reduction.

• Higher Load Capacity – Delivers greater preload than standard curved washers of equal size.

• Anti‑Loosening Performance – Dual contact points increase friction and resistance to bolt rotation under dynamic loads.

• Thermal Compensation – Maintains clamp load across wide temperature ranges, accommodating thermal expansion and contraction.

• Compact Design – Minimal axial space requirement, ideal for dense assemblies and confined spaces.

Applications

Saddle washers are also used in aerospace applications where every component must meet stringent safety and performance standards, providing reliable connections that can withstand extreme conditions including high pressures and temperatures.

Quality Assurance

Shanghai Malaxy Industry Co., Ltd., a recognized leader in China‘s fastener industry, operates under strict quality management systems with ISO 9001 certification. All saddle washers undergo dimensional inspection (per DIN 137B, GB/T 860, and ASME B18.21.1 standards), hardness testing (HRC 40–50 for spring steel grades), and load‑deflection verification before shipment. Material certificates (Mill Test Certificates) are available upon request.

Packaging & Lead Time

Standard packaging: small boxes → poly bags → export cartons → pallets (custom packaging accepted).
Lead time: 15–30 days depending on order quantity.
Shipping ports: Shanghai, Ningbo.

Why Choose Shanghai Malaxy?

As a leading fastener manufacturer with a verified 100% on‑time delivery record and a perfect 5.0/5.0 customer rating, Shanghai Malaxy combines technical expertise with operational excellence. Our international sales team provides responsive service, technical support, and customized solutions for global B2B buyers seeking reliable saddle washer supply at competitive wholesale prices.