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Help CenterDouble-layer Spring Washer With Mill Test Report, 100% Inspection, Standard Compliant, Carbon Steel, M6-M24
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Anping County Boli Hardware Wiremesh Products Factory, a trusted manufacturer established in 1998, proudly presents our Double-layer Spring Washer with Mill Test Report, 100% Inspection, Standard Compliant, Carbon Steel, M6-M24. These washers are engineered to provide superior locking force and vibration resistance in critical fastening applications. With a mill test report accompanying every batch and 100% inspection before shipment, we ensure consistent quality and traceability for demanding industrial uses.
Key Features & Technical Specifications
- Double-layer design – Provides higher spring force compared to single-layer washers, preventing loosening under dynamic loads.
- Carbon steel material – Offers excellent strength and durability; suitable for general mechanical applications.
- Size range M6 to M24 – Covers most common bolt sizes; other sizes available upon request.
- Mill Test Report (MTR) – Each batch is supplied with a certified material test report to verify chemical composition and mechanical properties.
- 100% inspection – Every washer is checked for dimensional accuracy, hardness, and surface finish to meet strict quality standards.
- Standard compliant – Manufactured in accordance with widely accepted industry standards (e.g., DIN, ISO, GB) to ensure interchangeability.
Product Specifications Table
| Parameter | Details |
|---|---|
| Material | Carbon Steel (e.g., 45# steel, 65Mn) |
| Surface Treatment | Plain (black oxide/zinc plating optional) |
| Hardness | HRC 38-46 (typical) |
| Tensile Strength | ≥ 450 MPa (depending on steel grade) |
| Packing Options | Bulk, poly bags, small boxes, or custom per request |
| Port of Shipment | Tianjin, Qingdao, Shanghai, Foshan |
Customer Benefits
- Enhanced reliability – The double-layer design significantly reduces the risk of bolt loosening in machinery, automotive, and construction applications.
- Full traceability – Mill test reports provide complete material transparency, essential for quality assurance and compliance audits.
- Consistent quality – 100% inspection ensures that every washer meets dimensional and hardness specifications, minimizing rejects on your assembly line.
- Cost-effective solution – Direct from a manufacturer with over 25 years of experience, we offer competitive pricing without compromising quality.
Frequently Asked Questions (FAQ)
Q1: What is a double-layer spring washer, and how is it different from a single-layer washer?
A: A double-layer spring washer consists of two spring steel layers, which provide higher elastic recovery and greater clamping force under vibration. It is ideal for applications where a single-layer washer may not offer sufficient locking.
Q2: Are these washers available in stainless steel or other materials?
A: Currently, our standard offering is carbon steel. However, we can produce washers in stainless steel or other materials upon request – please contact us for custom requirements.
Q3: What does the mill test report include?
A: The mill test report (MTR) includes the chemical composition, mechanical properties (tensile strength, yield point, elongation), and hardness test results of the raw material used for your batch.
Q4: Is the 100% inspection performed for all dimensions or just visual?
A: Our 100% inspection covers key dimensions (inner diameter, outer diameter, thickness) and hardness. Visual inspection for surface defects is also included. Each washer is individually checked.
Q5: Do you supply washers in non-standard sizes outside M6-M24?
A: Yes, we can customize sizes outside the standard range. Please provide your specific requirements for a quotation.
Q6: What is the usual lead time for large orders?
A: For standard sizes, the lead time is typically 15–25 working days depending on quantity. Expedited shipping options are available upon request.
Q7: How are the washers packaged to prevent damage during transit?
A: Washers are packed in sturdy poly bags or small boxes, then placed in export cartons or pallets. We also use anti-rust paper or oil as needed to protect against moisture.
Q8: Can I request a sample before placing a bulk order?
A: Absolutely. We offer samples for customer evaluation. Please contact our sales team with your delivery address and size requirements.
Why Choose Us?
Since 1998, Anping County Boli Hardware Wiremesh Products Factory has been a reliable manufacturer in the hardware industry. With an annual export value of US$5 Million – US$10 Million, we serve markets across North America, Europe, Asia, Africa, Oceania, and more. Our commitment to quality is reflected in our 100% inspection policy and mill test reports for every order. We ship from major Chinese ports (Tianjin, Qingdao, Shanghai, Foshan) and offer flexible packaging to meet your logistics needs. Choose our double-layer spring washers for a dependable, cost-effective fastening solution backed by decades of manufacturing expertise.
Contact us today for a quote or to request a sample. We look forward to partnering with you!
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