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DONGSHAO is a leading fastener manufacturer in China, specializing in high-quality washers type medium for bolts. These washers play a critical role in bolted connections by distributing clamping force, preventing loosening, and protecting the surface of connected parts. Manufactured with precision stamping technology and high-grade steel, our washers ensure excellent dimensional accuracy and mechanical performance. They are widely used in steel structures, bridges, power infrastructure, photovoltaic systems, and rail transit projects.

Why Choose DONGSHAO Medium Washers?Enhanced Connection Stability

Precisely controlled inner diameter (d), outer diameter (dc), and thickness (h) effectively distribute bolt preload, prevent local overpressure, and reduce the risk of structural deformation — significantly improving the safety and durability of critical connections.

Superior Material & Heat Treatment

Made from high-quality carbon steel or alloy steel, combined with in-house heat treatment (our own Dongshao Heat Treatment Plant), our washers offer high hardness, good toughness, and excellent wear resistance. Various surface finishes such as hot-dip galvanizing and Dacromet are available to meet different anti-corrosion requirements.

Full In-House Production Control

From raw material procurement, cold heading/stamping, heat treatment, to surface finishing — all processes are completed within our own facilities. This ensures strict quality control at every stage and guarantees reliable delivery times.

Complete Size Range & Customization Support

Standard stock covers sizes from M3 to M100. We also accept non-standard, custom-designed washers based on customer drawings to meet special project needs.

Product Parameter

(mm)	Φ3	Φ4	Φ5	Φ6	Φ7	Φ8	Φ10	Φ12	Φ13	Φ14	Φ16	Φ18	Φ20	Φ22	Φ23	Φ24	Φ25	Φ26	Φ27	Φ28	Φ30	Φ32	Φ33	Φ35	Φ36	Φ40	Φ45	Φ50	Φ55	Φ60	Φ65	Φ70	Φ75	Φ80	Φ85	Φ90	Φ95	Φ100
d min	3	4	5	6	7	8	10	12	13	14	16	18	20	22	23	24	25	26	27	28	30	32	33	35	36	40	45	50	55	60	65	70	75	80	85	90	95	100
d max	3.06	4.075	5.075	6.075	7.09	8.09	10.09	12.11	13.11	14.11	16.11	18.11	20.13	22.13	23.13	24.13	25.13	26.13	27.13	28.13	30.13	32.16	33.16	35.16	36.16	40.16	45.16	50.16	55.19	60.19	65.19	70.19	75.198	80.19	85.22	90.22	95.22	100.22
dc	6	8	10	12	14	16	20	25	25	28	28	30	32	34	36	38	40	40	40	42	45	50	50	52	52	58	62	68	75	80	90	95	100	110	110	115	120	125
h	0.8	0.8	0.8	1.6	1.6	2	2.5	3	3	3	3	4	4	4	4	4	4	5	5	5	5	5	5	6	6	6	7	8	9	9	9	10	10	12	12	12	12	14

Company Strength & Production Capabilities

About Us: Hebei Dongshao Fastener Manufacturing Co., Ltd. was founded in the 1980s and has grown into a high-tech enterprise integrating R&D, production, and sales. With a construction area of over 10,000 square meters, a workforce of more than 100 employees, and over 20 engineering technicians, we are now a group company operating multiple subsidiaries, including:

Yongnian County Southeast Fastener Manufacturing Co., Ltd.

Handan Dongke Metal Surface Treatment Plant

Dongshao Heat Treatment Plant

 

We have been repeatedly recognized as a "315 Excellent Credit Reference Demonstration Unit" in Hebei Province.

Production Equipment: Our factory is equipped with advanced cold heading machines, dozens of sets of hot stamping equipment, and newly imported high-speed nut forming machines from Taiwan. Our machinery includes:

Cold heading machines

Pneumatic punching presses

Hydraulic presses

Thread rolling machines

CNC lathes and conventional lathes

Milling, grinding, and drilling machines

Heat treatment furnaces

Surface Treatment & Quality Control: With our in-house surface treatment and heat treatment facilities, we offer hot-dip galvanizing, Dacromet coating, blackening, phosphating, and other finishes to enhance corrosion resistance and meet diverse environmental requirements.

 

Applications & Key Customers

Industry Applications: Our medium washers are widely used across multiple industries:

Steel Structures & Construction: High-rise buildings, airports, convention centers

Transportation: Highways, bridges, railway (including high-speed rail)

Energy: Wind power towers, nuclear power equipment, photovoltaic solar mounting systems

Infrastructure & Mining: Heavy machinery, pipeline connections, metallurgical equipment

 

Representative Cooperative Cases: We have established long-term, stable partnerships with many leading companies, including:

CFHI Tianjin Heavy Industry Co., Ltd.

China Railway 14th Bureau Group Co., Ltd.

China Construction Second Engineering Bureau – Nuclear Power Construction

Sinohydro Bureau 12 Co., Ltd.

Fujian Hongguan Road & Bridge Anti-Corrosive Technology Co., Ltd.

Xinbang Construction Group Co., Ltd.

China Jianzhong Nuclear Fuel Co., Ltd.

 

Global Market & Export Experience

Export Destinations:

Our products are not only sold throughout China but also exported to:

Southeast Asia

Europe

North America

South America

Africa

We have earned high praise from customers worldwide for our consistent product quality and reliable after-sales service.

 

Our Service Commitment

We are dedicated to providing a full-range service experience:

Pre-Sale Service: Our technical team helps customers understand product features and benefits, provides professional advice, and customizes solutions based on specific project requirements.

In-Sale Service: We handle order processing, logistics tracking, and on-time delivery to ensure a smooth and hassle-free purchasing process.

After-Sale Service: We offer post-sales support, maintenance guidance, and customer training to ensure you enjoy continued value and satisfaction after using our products.

 

Call to Action

If you are looking for the best Washers Type Medium for Bolts at competitive prices, DONGSHAO is your trusted partner. We welcome inquiries for samples, quotations, or customized solutions.

Send Inquiry Now – Our sales team will reply within 24 hours.