What certifications do you have?

We hold ISO9001 and RoHS certifications, and we are a verified supplier on Made-in-China.

What is your packaging standard?

Standard packaging is 20-25 kg per carton, with 36 or 48 cartons per pallet. Custom packaging with customer logos is also available.

ASTM F436 HDG Hardened Structural Flat Washer F436 Black Plain Flat Washer

Name: ASTM F436 HDG Hardened Structural Flat Washer F436 Black Plain Flat Washer
Brand: Bolnut Fastener Co., Ltd
SKU: 2223150705

Jiangsu, ChinaBolnut Fastener Co., Ltd

US$0.10

1 Piece

Sample price:US$0.10/piece.Request sample

Product profile

Customization

Available

Type

Flat Gasket

Material

Stainless Steel/Carbon Steel

Model NO.

ASTM F436

Combination Washer Structure

A Type

Combination Washer Packaging

All Inclusive

Spring Washer Type

Standard

MOQ

10000 PCS

Name

Hardened Structural Flat Washer

Certificate

ISO9001,RoHS

Finish

Black, Zinc, Plain, Hot DIP Galvanized

Transport Package

20-25kg/Carton+900kg Pallet

Specification

#1/4-#7/8

Trademark

BNT

Origin

China

HS Code

731815

Production Capacity

1000ton/Month

Key features

Comprehensive Finish Options: Available in Zinc, HDG, Black Oxide, Geomet, Dacroment, Anodization, and Nickel Plating.

Wide Material Selection: Stainless Steel (SS201-904L) and Carbon Steel grades to meet diverse corrosion and strength needs.

Flexible Customization: OEM/ODM services available with customization from samples, designs, or full specifications.

Fast Sample Delivery: Free samples for standard fasteners; samples under 1kg shipped free for new customers.

Strict Quality Assurance: Rigorous durability testing and technical design to enhance product lifespan and reliability.

Professional Manufacturing: Over 10 years experience with stamping, machining, and CNC for precise fastener production.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceYears of Export ExperienceFast Delivery

Bolnut Fastener Co., Ltd

Jiangsu, China

CertifiedBusiness Type: Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 13 YearsNearest Port: SHANGHAI , NINGBO ,ZHAPU , SHENZHEN, TIANJINGAverage Response Time: ≤0.82h

AI-Powered supplier vetting

SummaryThe supplier is identified as a trading company in Zhangjiagang, Suzhou, with business scopes covering labor protection products, apparel, textiles, communication equipment, electronics, and certain medical protective products. It is described as a professional technical supplier and offers multiple customization modes, ODM services, and OEM services for popular brands. However, it has only one R&D engineer, launched no new products in the past year, and does not provide 3D software or SDK services. Service procedures and complaint-handling procedures exist, but supplier approval records are incomplete. Financial information is represented only by reporting years, without performance values. No overseas warehouse, showroom, overseas branch or offline trade-show participation is reported.

Supplier typeThe supplier is explicitly classified as a trade company, while its stated scope includes labor protection products, apparel, textiles, medical protective equipment, communication equipment, and electronic products. It is also identified as a professional technical supplier, indicating a trading-oriented business with technical and customization support rather than confirmed manufacturing status.

After-Sales capabilityThe supplier has a clear complaint-handling procedure with followed records, and it has a corrective and preventive action mechanism with implementation records. However, its general service-assessment procedure has no records, and its approved-supplier list lacks approval signatures or dates, indicating documented but incompletely controlled service processes.

R&D capabilityThe supplier is identified as a professional technical supplier and offers ODM services, but it has only one R&D engineer, launched no new products in the past year, and lacks both 3D software design and SDK capabilities. This shows some technical development and design support, but limited demonstrated innovation output and digital R&D capability.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, full customization, minor customization, and flexible customization. It also provides ODM services, directly evidencing broad customization and design-manufacturing support.

Client casesA repeat-buyer preference of 50%–80% is reported, and the supplier states that it provides OEM services for popular brands. These are positive customer-related indicators, but no named customers, specific projects, order examples, or independently verifiable case details are provided.