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Home > Tools & Hardware > Hardware Accessories > Spring > Double-layer Spring Washer for Automotive Engine Assembly SAE Standard Lock Washer M14

Double-layer Spring Washer for Automotive Engine Assembly SAE Standard Lock Washer M14

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Double-layer Spring Washer for Automotive Engine Assembly SAE Standard Lock Washer M14 photo-5

Product Spotlights

Double-layer design provides superior locking force and vibration resistance for automotive engine assemblies. Meets SAE standard M14 dimensions. Made from high-grade spring steel (65Mn/60Si2Mn/50CrV) with customizable surface finishes. Precision manufacturing ensures consistent quality. Backed by Anping Boli Hardware's 20+ years of expertise and global export markets.

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

Key Specifications

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Material:

Other, Spring steel (65Mn / 60Si2Mn / 50CrV optional)

Size:

M14 (inner diameter 14mm, outer diameter 28mm, thickness 2.5mm)

Standard:

SAE (Society of Automotive Engineers) standard

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Anping County Boli Hardware Wiremesh Products Factory

2Yrs

Payment & Shipping

Payment Methods:

Port of Shipment:

tianjin shanghai qingdao

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
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Material Other, Spring steel (65Mn / 60Si2Mn / 50CrV optional)

Size M14 (inner diameter 14mm, outer diameter 28mm, thickness 2.5mm)

Standard SAE (Society of Automotive Engineers) standard

Type Double-layer spring lock washer

Finish Zinc plated, black oxide, or plain (customizable)

Application Automotive engine assembly, heavy machinery, industrial equipment

Packaging Bulk bags, boxes, or customized packaging

Hardness HRC 40-50 (typical range)

Anping County Boli Hardware Wiremesh Products Factory, established in 1998, is a professional manufacturer specializing in high-quality fasteners and hardware components. With over two decades of experience and an annual export value exceeding $5 million, we supply reliable locking solutions to global markets including North America, South America, Europe, and Asia. Our Double-layer spring washer for automotive engine assembly SAE standard lock washer M14 is engineered to provide superior anti-loosening performance in demanding engine environments. Designed to meet SAE specifications, this washer ensures consistent clamping force, vibration resistance, and long-term reliability—critical for automotive and industrial applications.

Product Features & Technical Specifications

Double-layer design for enhanced spring action and locking ability compared to single-layer washers
SAE standard compliance ensures dimensional accuracy and performance consistency
M14 size fits bolts with 14mm nominal diameter, providing reliable preload retention
High-grade spring steel material (65Mn, 60Si2Mn, or 50CrV available) for excellent elasticity and durability
Surface treatment options: zinc plating, black oxide, or plain finish—customizable to resist corrosion
Hardness range typically HRC 40-50, balancing strength and flexibility
Precision manufacturing ensures tight tolerances and consistent performance across batches
Ideal for automotive engine assembly, especially in cylinder head, connecting rod, and bearing cap applications

Parameter	Value
Nominal Size	M14
Inner Diameter (d)	14 mm
Outer Diameter (D)	28 mm ±0.5 mm
Thickness (t)	2.5 mm ±0.1 mm
Material	Spring steel (65Mn / 60Si2Mn / 50CrV)
Hardness	HRC 40-50
Surface Finish	Zinc plated, black oxide, or plain (customizable)
Packing	Bulk bags, boxes, or as per customer request

Advantages for Your Application

Enhanced vibration resistance: The double-layer spring design provides greater elastic deformation, effectively preventing bolt loosening under high-frequency vibration—common in engine assemblies.
Reduced maintenance costs: By maintaining consistent clamping force, the washer minimizes the need for retorqueing and reduces the risk of component failure.
Long service life: Premium spring steel and precise heat treatment ensure fatigue resistance and longevity, even in high-temperature engine environments.
Easy installation: Standard SAE dimensions allow drop-in replacement for existing M14 lock washers without modification.
Customizable options: Choose from various materials, surface treatments, and packaging to meet your specific production requirements.
Consistent quality: Our factory implements strict quality control procedures, including dimensional inspection and hardness testing, ensuring each batch meets SAE standards.

Why Choose Anping County Boli Hardware?

Since 1998, we have been dedicated to manufacturing high-quality hardware products. Our factory is located in Hengshui, Hebei, China, with convenient access to major ports such as Tianjin, Qingdao, Shanghai, and Foshan. With an annual export value of US$5 million to US$10 million, we have established a strong presence in markets across North America, South America, Europe, Africa, and Asia. Our team is committed to delivering products that meet international standards, and we offer flexible customization to align with your engineering drawings or specifications. Whether you require a small trial order or large-volume container shipment, we can accommodate your needs with competitive pricing and reliable delivery.

We understand that automotive engine components demand uncompromising quality. That's why our double-layer spring washers undergo rigorous testing to ensure they perform under the most challenging conditions. By choosing our product, you are partnering with a manufacturer that prioritizes precision, durability, and customer satisfaction.

Contact us today for a quote or to request samples. Let us help you secure your critical assemblies with a trusted locking solution.

Frequently Asked Questions (FAQ)

What is the difference between a double-layer spring washer and a standard single-layer one?
Double-layer spring washers provide approximately twice the spring force of single-layer washers of the same material thickness. This results in stronger locking action and better resistance to loosening under vibration and dynamic loads. They are ideal for critical applications like engine assembly.
Are these washers compatible with metric M14 bolts?
Yes, the inner diameter is 14mm, designed to fit standard M14 bolts. The outer diameter and thickness conform to SAE J238 dimensions for M14 lock washers.
What surface treatments are available?
We offer zinc plating (yellow or blue passivation), black oxide, and plain (as-rolled) finish. Other treatments such as Dacromet, phosphate coating, or hot-dip galvanizing are available upon request. Please specify your corrosion resistance requirements.
Can you provide custom sizes or materials?
Yes, we can customize the washer dimensions, material grade (e.g., 60Si2Mn, 50CrV), hardness, and surface finish according to your engineering drawings. A minimum order quantity may apply for custom items.
What is the typical lead time for an order?
For standard M14 double-layer spring washers, lead time is usually 15-25 days after order confirmation, depending on quantity. Custom orders may require additional time for tooling and material sourcing.
Do you offer samples for testing?
Yes, we can provide samples for evaluation. Please contact us with your shipping details. Sample costs and freight charges may apply, but we can refund the sample cost for bulk orders.
How do you ensure product quality?
We implement a quality management system that includes incoming material inspection, in-process dimensional checks, hardness testing, and final visual inspection. Each batch is accompanied by a test certificate showing compliance with SAE standards.
What is the packaging method?
We typically pack the washers in poly bags then into cartons or woven bags, with palletization for sea freight. Custom packaging (e.g., small boxes, blister packs, or barcode labeling) is available on request.