What are your terms of payment?

We can accept T/T, L/C for general Paypal and Western Union for small orders or sample orders.

What is your packing?

Our packing is 15-25 kg for one carton,36 or 48 pcs cartons for one pallet. One pallet is about 900-960 kg. We can make the customer's logo on the cartons. Or we customized cartons according to customers' requests.

Can we print our own logo?

Yes, we can make it according to your request.

White Zinc Plated Extension Hex Long Coupling Nut for Studs and Bolts

Name: White Zinc Plated Extension Hex Long Coupling Nut for Studs and Bolts
Brand: Ningbo Oukailuo Hardware Co., Ltd.
SKU: 2294425045

Zhejiang, ChinaNingbo Oukailuo Hardware Co., Ltd.

US$0.005-5.00

50,000 Pieces

Product specifications

Specification

Sample price:US$0.50/piece.Request sample

Product profile

Customization

Available

Material

Carbon Steel

Type

Hexagon Head

Model NO.

OKL-S131

Connection

Common Bolt

Head Style

Hexagonal

Standard

DIN, ANSI, GB, JIS, GOST, BSW

Product Name

Hex Long Coupling Nut

Keywords

Coupling Nut

Thread Type

Machine Thread (Metric)

Surface Finish

Zinc Plated (Clear/Blue/Yellow), HDG,Black Oxide

Size Range

Customizable (Thread: M3-M30; Length: 10mm-100

Style

Long Hex Coupling Nut

Features

Corrosion Resistant, Anti-Loosening, High Torque T

Compliance

DIN, ISO, ANSI/ASME, JIS,Custom

Applications

Automotive, Machinery, Construction, Electronics,

Transport Package

Standard Packaging or Customized

Specification

Standard Specifications or Customized

Trademark

OUKAILUO

Origin

Zhejiang, China

HS Code

7318160000

Production Capacity

300000000PCS/Year

Key features

High-Strength Carbon Steel: Made from premium carbon steel (Grade 4.8/8.8/10.9) for reliable durability.

Corrosion Resistant Finish: Bright zinc plating or HDG options provide basic corrosion resistance.

Secure Thread Engagement: Extended hex body design ensures strong connection between threaded rods.

Customizable Sizes: Thread sizes M3-M30 and lengths 10mm-100mm are available for customization.

Versatile Applications: Ideal for construction, scaffolding, machinery, and industrial use.

Precision Internal Threads: Uniform, precision-rolled threads ensure smooth mating with standard bolts.

Standard Hex Profile: Six-sided design allows easy installation with standard wrenches and sockets.

OEM/ODM Service: Supports customization from samples with dedicated R&D engineers.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceYears of Export ExperienceODM Services

Ningbo Oukailuo Hardware Co., Ltd.

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples CertifiedExport Year: 14 Years CertifiedNearest Port: Ningbo Port, Shanghai PortAverage Response Time: ≤2.84h

AI-Powered supplier vetting

SummaryThe supplier is a fastener manufacturer with capabilities spanning R&D, design, production, quality control, and after-sales service. It reports recent new-product development, ODM services, OEM experience with well-known brands, sample-based customization, five production lines, and approximately one-month lead times in both peak and off-peak periods. However, the available evidence also identifies important limitations: no supplier-management certification is listed, service procedures lack records, no overseas warehouse, showroom, agent, branch, or offline trade-show participation is reported, and no factory environmental impact assessment or regular fire drills were reported. Financial information is represented only by year labels, without substantive financial metrics, so credibility cannot be determined from the provided slices.

Supplier typeThe supplier describes itself as a fastener producer covering R&D, design, manufacturing, quality control, and after-sales service. Its reported five production lines and OEM/ODM activities support classification as a manufacturer rather than only a trading or service intermediary.

CertificationsThe supplier-management certification field is explicitly recorded as “NIL,” and no other certification is identified in the provided evidence. This is a stated absence of certification information rather than merely incomplete documentation.

R&D capabilityThe supplier reports new products during the past year, provides ODM services, and has two years of R&D engineer experience in the supplied data. These points support active product development, although the reported absence of an available SDK limits evidence of software or integration-oriented R&D capability.

Production capacityThe supplier reports five production lines, fastener-production experience, CNC machining with micron-level precision, and one-month lead times in both peak and off-peak seasons. Its Ningbo location and access to Ningbo and Shanghai ports further support logistics, although production capacity volume is not quantified.

Customization capabilityThe supplier explicitly offers customization from samples, ODM services, and custom-machined parts using CNC lathes. This provides direct evidence of both sample-based and design-oriented customization capability.

Client casesThe supplier states that it provides OEM services for well-known brands, which is direct evidence of customer experience with recognized-brand projects. However, no customer names, project details, or verifiable case records are provided, so the breadth and quality of its customer portfolio cannot be fully evaluated.

Product Q&A

Q:How about your price?

High-quality products at a reasonable price. Please give me an inquiry, and I will quote you a price for you to refer to at once.

Q:How do you control your quality?

We have our in-house QC daily and advanced optical inspection equipment. You could hire a third party for random inspection.

Q:Could you provide free samples?

For our regular products, we offer free samples. For customized screws, bolts, tooling, and moulding, charges are needed. All free samples do not including its courier charge.

Q:Do you accept small orders?

Sure, we can accept any orders. We keep lots of stock for ALL STAINLESS STEEL FASTENERS and CARBON STEEL FASTENERS, like pan head screws, flat head screws, Phillips screws,torx screws, hex screws, etc.

Q:How about your delivery time?

Generally speaking, if the goods are in stock, we can deliver them within 2-5 days. If the quantity is 1-2 containers, we can give you 25-35 days. If the quantity is more than 2 containers and you are very urgent, we can let the factory prioritize producing your goods.