Spring Lock Washer

Spring Lock Washer

5 month ago

4 0

Ningbo Yaoke Hardware Products Co., Ltd.

 2 year year

Product details

Double Coil Spring Washer | Helical Lock Washer HDG | Yokelink

Extended Tension for Wood Pole Shrinkage.

The Yokelink Double Coil Spring Lock Washer is an advanced fastening solution specifically designed for wood poleline and crossarm assemblies. Unlike standard single-coil washers, the unique double-coil helical design provides twice the reactive range (deflection).

Why Double Coil?

Utility poles and wooden crossarms naturally shrink over time due to weathering, aging, and moisture loss. This shrinkage causes standard hardware to loosen. Our double coil spring washers maintain continuous, active spring tension on the nut and bolt assembly, effectively compensating for wood shrinkage and eliminating the need for costly maintenance tightening.

Manufactured from high-carbon spring steel, these washers are Hot Dip Galvanized (HDG) to withstand the harshest outdoor utility environments without losing their spring temper.

Key Features of Double Coil Spring Washer:

Design: Two full helical coils for extended spring travel and tension.

Application: Ideal for wood pole connections prone to shrinkage.

Material: Premium High-Carbon Spring Steel.

Finish: Hot Dip Galvanized for maximum rust prevention.

Maintenance: Significantly reduces post-installation retightening costs.

Production Process of Double Coil Spring Washer

Double coil spring washers are produced from high‑quality spring steel strips. After material straightening and cutting, the strips are formed into a double coil spring structure by precision coiling machines. They are then heat treated to enhance elasticity and mechanical performance. Deburring and surface treatment are conducted. Finally, they are hot‑dip galvanized per ASTM A153. Production and inspection comply with IEEE C135.1 and IEEE C135.80 standards.

Yokelink Quality Control and Testing Equipments

We don't just reference standards; we also verify them in practice: each batch of products undergoes destructive tensile testing in our internal laboratory to ensure load performance exceeds the minimum requirements of IEEE C135.1 / IEEE C138.80 or CSA specification; we use optical comparators to ensure the geometric accuracy of chamfered tips and rolled threads, enabling convenient on-site installation; at the same time, we conduct comprehensive testing on Rockwell hardness, coating thickness, and other parameters, and each shipment is accompanied by the original manufacturer's material specifications (MTRs) and quality inspection reports, with all data traceable back to the raw material furnace number.

The Application of Double Coil Spring Washer

Double coil spring washers are widely used in overhead transmission and distribution lines, mechanical equipment, and bolted connections. They provide reliable elastic locking, effectively preventing loosening caused by vibration and dynamic loads. Made of spring steel with stable elasticity and hot-dip galvanized per ASTM A153, they offer good corrosion resistance. Fully compliant with IEEE C135.1 and IEEE C135.80 standards, they ensure safe, stable, and long-lasting fastening performance in outdoor and heavy-duty applications.

Yokelink Product Quality Inspection Report

We provide comprehensive inspection services for machine bolts, including SGS test bolts and formal Production Part Inspect Report (PPIR). The SGS tests verify the bolts’ compliance with international standards like ASTM A307 and IEEE C135.80, covering mechanical properties and corrosion resistance. The PPIR details all inspection items, ensuring each machine bolt meets dimensional, performance and quality requirements, providing reliable quality assurance for overhead line and industrial applications.

Technical Specifications of Double Coil Spring Washer

Part No.	Size Section	For Bolt Diameter	Weight
Part No.	Size Section	Inch	Kg / Pcs
A1438D	3/32"X9/64"	3/8	0.007
A1412D	5/32"X13/64"	1/2	0.018
A1458D	3/16"X15/64"	5/8	0.030
A1434D	7/32"X17/64"	3/4	0.047.

Cross Reference (Industry Equivalents):

Size Section	Part No.	HUBBELL	MACLEAN
Size Section	Part No.	HUBBELL	MACLEAN
3/32"X9/64"	A1438D	C2050188	J175
5/32"X13/64"	A1412D	C2050185	J176
3/16"X15/64"	A1458D	C2050186	J177
7/32"X17/64"	A1434D	C2050187	J178

(Note: Manufacturer part numbers are for reference only. Yokelink products are interchangeable based on IEEE standards.)

Frequently Asked Questions (FAQ)

Q1: What is the advantage of a double coil spring washer over a standard single coil washer?

A: A double coil spring washer provides twice the spring travel (deflection) compared to a single coil washer. In utility pole applications, this extra travel is crucial. It allows the washer to maintain continuous clamping force and keep the nut tight even when the wooden pole or crossarm shrinks significantly due to weather and aging.

Q2: Should I use a flat washer with a double coil spring washer on a wood pole?

A: Yes, absolutely. The double coil spring washer should be placed directly under the nut, but you must place a large square flat washer between the double coil washer and the wood pole. The square flat washer distributes the load to prevent crushing the wood, while the double coil washer maintains the tension.

Q3: Does the Hot Dip Galvanizing process affect the spring temper of the washer?

A: If not done correctly, excessive heat can reduce spring tension. However, Yokelink double coil spring washers are manufactured and galvanized using strictly controlled thermal processes that protect the high-carbon steel's temper, ensuring they retain their full spring action while providing excellent corrosion resistance.

Value-Added Supply Chain Services

1. Blanket Order & Free Warehousing

Yokelink offers Blanket Order programs: Place an annual order to lock prices, we manufacture your total volume and hold stock in our facility free of charge. Split Shipments: Schedule partial shipments (e.g., monthly or quarterly) based on your project progress. You get the benefits of just-in-time delivery without the risk of shortages.

2. DDP Shipping (USA Duties Included)Landed Cost Certainty

We handle the complex logistics. Our DDP (Delivered Duty Paid) service covers sea freight, US Customs clearance, and Section 301 tariffs. The price we quote is the final price delivered to your door / Warehouse.

3. Free Sample Program

We offer Free Samples to qualified commercial buyers for testing and approval.

Reference Information:

For IEEE C135.1 technical details behind our specification, see Understanding IEEE C135.1 Standard

https://www.yokelink.com/blog/understanding-ieee-c135-1-standard-for-zinc-coated-steel-bolts-and-nuts-in-overhead-line-construction-32333.html

Contact Now

If you are interested in the product, contact 2bvideo.com for more information for more information

To:: Ningbo Yaoke Hardware Products Co., Ltd.

Message:

Submit

Disclaimer：

The information of 2bvideo.com limited shown above is provided by the user or collected on the network. Video 2B does not guarantee the authenticity,accuracy and legitimacy of 2bvideo.com limited information. Video 2B does not involve legal relationships and disputes between users arising from transactions other than secured transactions on this website. Disputes shall be settled by you through negotiation. If you are the person in charge or relevant employee of this enterprise, if you find that the enterprise information is incorrect or want to manage thiscompany, please contact us jacklee1558@gmail.com, after you claim the enterprise, you can obtain management permission, publish supplyand demand information, bring consulting orders, and remove page advertisements.

Ningbo Yaoke Hardware Products Co., Ltd.

 Audited supplier

2 year

Address: China

Main Product: Industrial Fasteners, Utility & Pole Line Hardware , Power Transmission & Mechanical Parts, Agricultural & Farm Hardware, Industrial Tools & Accessories, Construction & Structural Metalware

 Contact now

Disclaimer：