What is the difference between nylon lock nut and ordinary hex nut?

Nylon insert creates friction resistance to prevent loosening under long-term vibration; ordinary nuts need spring washers for auxiliary anti-loosening.

Do your bolts comply with international standards?

Yes. Most standard bolts strictly follow DIN912, DIN6921, DIN975, BS3410 standards. Metric sizes M3-M36 and partial inch sizes are all available.

What is the function of the flange serrations?

The serrations bite into workpiece surface to boost anti-slip resistance and lower the risk of bolt loosening under vibration.

Are the bolts and nuts packed and shipped as complete sets?

Yes, bolts and matching nuts are supplied as complete sets for one-stop purchase. Separate supply is also available upon request.

What strength grades can you supply?

Grade 8.8 and 10.9 are available in stock. Higher strength specifications can be custom produced.

Can specifications be customized?

Custom non-standard length and thread size are supported, and surface treatment can be adjusted as requested.

Customized High Strength Fastener Galvanizing Hex Flange Head Serrated Bolt with Hexagonal Nut

Name: Customized High Strength Fastener Galvanizing Hex Flange Head Serrated Bolt with Hexagonal Nut
Brand: Qewitco Fasteners Co., Ltd
SKU: 2149649612

Shandong, ChinaQewitco Fasteners Co., Ltd

US$0.01-0.20

1,000 Pieces

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Material

Carbon Steel

Type

Hexagon Head With Flange

Model NO.

Hexagon Flange Head Bolts

Connection

Common Bolt

Head Style

Hexagonal

Standard

DIN, ISO

Grade

8.8

Application

Machinery, Chemical Industry, Environmental, Building

Finish

Hot Galvanizing

Standards

DIN 6921

Custom Order

Customization by Drawing/Sample

Size Standard

Metric

ODM/OEM

Available

Service

Custom-Made Service

Material Test Certificate

Have

Delivery

15-30 Days

Packag Color

Customizable

Sample

Samples in Stock Are Free with Freight Collect

Price Terms

Fob/CFR/CIF/DDP/DAP

Quality Control

100% Quality Inspection

Application2

Connection,Fastening

Transport Package

Bulk Pack Small Boxed

Specification

M6-M24, custom lengths available

Trademark

Customized

Origin

China

HS Code

731816

Production Capacity

10000ton/Year

Key features

This hex flange serrated bolt comes with serrated flange to increase friction and prevent loosening after tightening.

The bolt is delivered together with matching nut for one-stop procurement, reducing separate stocking cost for buyers.

The product can be produced per DIN standard with stable thread precision to ensure smooth fitting between bolt and nut.

It is finished with Dacromet coating, featuring excellent salt spray resistance for outdoor, humid and mildly corrosive working environments.

The integrated hex flange eliminates the need for extra flat washers, saving assembly steps and spare parts.

Strength grades of 8.8 and 10.9 are available to fit equipment and steel structure fastening under different loads.

Company profile

Years of Export ExperienceExperienced TeamSelf-brandedHigh Repeat Buyers Choice

Qewitco Fasteners Co., Ltd

Shandong, China

CertifiedBusiness Type: Trading Company CertifiedR&D Capacity: ODM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc.Export Year: 2003-12-05Average Response Time: ≤1.10hTerms of Payment: T/T

AI-Powered supplier vetting

SummaryThe supplier demonstrates established export experience, with 90% of sales from exports and 22 years of exporting. It has ISO9001:2015 certification, raw-material traceability, quality assurance, and 100% finished-product inspection, although inspection is performed by packing staff and only two quality inspectors are reported. Customization is broad, covering samples, designs, full customization, minor customization, and flexible customization. Service strengths include in-stock capability, stated lead times within 15 workdays in both peak and off-season, and multiple payment and quotation terms. Limitations include no overseas warehouse, showroom, agent, branch, or overseas service-country coverage, no Fortune 500 cooperation, no new products launched in the last year, one R&D engineer, no popular-brand OEM, and an undocumented corrective/preventive-action process. Financial credibility cannot be assessed because the provided financial figures are excluded from evaluation.

Supplier typeThe supplier is strongly export-oriented, reporting 90% export sales and 22 years of export experience. It can provide in-stock service and accepts FOB, CIF, CFR, and EXW terms, but reports no overseas warehouse, showroom, agent, branch, or overseas service-country coverage.

CertificationsThe supplier reports an ISO9001:2015 certificate for both sustainable development management and management systems, plus other product compliance or sustainability certifications. The specific additional certifications are not identified, so the evidence supports ISO9001 holding but not broader certification strength.

R&D capabilityThe supplier reports one R&D engineer and no new products launched during the previous year. It also reports no available SDK and no popular-brand OEM capability, which indicates limited documented innovation evidence.

Production capacityProduction-related evidence includes raw-material traceability, 100% finished-product inspection, quality assurance, four own-brand quality-control capabilities, inventory capacity, and lead times within 15 workdays in both peak and off-season. Only two quality inspectors are reported, and finished products are checked by packing staff, so production capability is positive but quality-control depth is limited.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, full customization, minor customization, and flexible customization. This is direct evidence of broad customization capability.

Product Q&A

Q:Are your products certified? Can I get the certification files?

All our products comply with industry standards and hold valid certificates. Please send us a message, and we will provide you with the relevant certification documents promptly.

Q:Can you offer detailed dimension drawings and specifications?

We have complete size data for all items. Feel free to contact us to receive the detailed product dimensions.

Q:Do bolts and nuts need to be purchased in matching grades?

Definitely yes. Different strength grades have different hardness. Mismatched grades will cause thread stripping or bolt fracture under load.

Q:What finish is most suitable for coastal construction?

Choose Geomet coating for carbon steel fasteners; 316 (A4) stainless steel is the long-term stable option.

Q:Can we customize non-standard size bolts and nuts?

We support OEM & ODM customization for non-standard diameter, length, thread pitch and surface color.