What is the difference between A2 and A4 stainless steel bolts?

A2 (304) is ideal for standard outdoor and industrial use, while A4 (316) contains molybdenum, offering higher corrosion resistance for marine, chemical, and salt-spray environments.

Will stainless steel bolts rust over time?

Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection.

Customized ISO 4014 Black Oxide Carbon Steel Grade 12.9 Half Partial Thread Hexagon Hex Bolt M8

Name: Customized ISO 4014 Black Oxide Carbon Steel Grade 12.9 Half Partial Thread Hexagon Hex Bolt M8
Brand: Ningbo Mianxuan Import &Export Co., Ltd.
SKU: 2290862695

Zhejiang, ChinaNingbo Mianxuan Import &Export Co., Ltd.

US$0.01

1,000-2,999 Pieces

US$0.005

3,000-9,999 Pieces

US$0.001

10,000+ Pieces

Sample price:US$0.00/piece.Request sample

Product profile

Customization

Available

Material

Carbon Steel

Type

Hexagon Head

Model NO.

ISO 4014

Connection

Common Bolt

Head Style

Hexagonal

Standard

DIN, ANSI, GB, JIS, BSW, GOST, ISO

Grade

12.9

Application

Machinery, Chemical Industry, Environmental, Building

Finish

Black

Quality

100% Tested

Price

Factory Price

Lead Time

15-30 Days

Surface

Plain, Zinc Plated (Blue, White, Black, Yellow)

Package

Standard Package or Customer's Packing

Box

Customer's Brand Box/Plain Box

MOQ

Can Be Negotiated

Shipment

by Sea / Truck / Plane / Express

Exterior Finish

Customized

Sample

Available

Customized

Available

Service

One-Stop Service

Online Sales

24 Hours Online

OEM/ODM

Available

Head

Hexagonal

Transport Package

Bulk Packaging, Small Box(Glue Box, Color Box)

Specification

M1.6-M64

Trademark

Mianxuan, Customized

Origin

Zhejiang, China

HS Code

7318159090

Production Capacity

1000tons Per Month

Key features

CE Certified for EU Construction Compliance: Structural fasteners fully compliant with EN 14399 and EN 15048. A Declaration of Performance (DoP) is provided with every shipment.

REACH & RoHS Compliant - Cr+6 Free: All surface treatments use trivalent chromium (Cr+3) passivation. Full compliance documentation provided.

Full Material Traceability: EN 10204 3.1 MTR with heat number traceability from the steel mill to the final shipment. SGS, TUV, and BV third-party inspection available.

Engineered Surface Treatments: Zinc Plated (Cr+3), Hot Dip Galvanized, Geomet (Cr-Free), Zinc-Nickel Alloy. Salt spray resistance from 72 to 1,200+ hours.

Structural Bolting - EN 14399 HR/HV Systems: Preloaded bolt assemblies for steel construction. CE certified with full DoP. Available in HDG and Geomet finishes.

100% Final Inspection: Visual sorting, dimensional gauging, and mechanical sampling on every batch before packing. Defective units eliminated at source.

Company profile

High Repeat Buyers ChoiceYears of Export ExperienceR&D CapabilitiesODM Services

Ningbo Mianxuan Import &Export Co., Ltd.

Zhejiang, China

Business Type: Manufacturer/FactoryExport Year: 2014-07-01Nearest Port: Ningbo, Zhapu, ShanghaiAverage Response Time: ≤2.80hTerms of Payment: LC, T/T, Western UnionInternational Commercial Terms(Incoterms): FOB, EXW, CFR, CIF

AI-Powered supplier vetting

SummaryNingbo Mianxuan Import & Export Co., Ltd. is a manufacturer based in Zhejiang, China, specializing in metal products and auto parts. The company holds ISO 9001 and TS 16949 certifications, indicating adherence to quality management standards. It lacks a structured after-sales service capability and does not have in-stock service or overseas facilities. Financial information is available, but specific trade figures are unknown. The supplier has a moderate R&D team and offers ODM services, but no new products were developed recently. The company provides comprehensive customization services and operates over ten production lines, though it does not engage with major brand OEM services.

Supplier typeThe supplier is a manufacturer/factory located in Zhejiang, China.

CertificationsThe supplier holds TS 16949 and ISO 9001 certifications, demonstrating strong quality management systems.

After-Sales capabilityThere is no evidence of a structured after-sales service system, as there are no written procedures or records available.

Production capacityThe company operates more than ten production lines with an annual output of US$10 Million - US$50 Million.

Customization capabilityThe supplier offers extensive customization services, including full and minor customization from samples and designs.

Product Q&A

Q:What thread standards do you follow?

Our screws comply with DIN, ISO, ANSI, and JIS standards, and can also be customized according to customer drawings.

Q:What stainless steel grades do you supply for bolts?

We supply multiple grades including A2-70, A2-80, A4-70, A4-80, 304, 316, and 410SS, suitable for different mechanical strength and corrosion-resistance requirements.

Q:Do you provide samples before mass production?

Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order.

Q:How do you control product quality?

Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards.

Q:Do you offer OEM or customized production?

Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling.