What surface treatment is applied to these bolts?

The surface is treated with blackening to form a dense oxide film, improving corrosion resistance.

What are the common specifications and sizes?

Common specifications include M2, M2.5, M3, M4, M5, M6, M8, M10, and M12, with lengths ranging from a few millimeters to tens of millimeters.

Where are these products mainly used?

They are widely used in mechanical equipment, furniture manufacturing, electronic devices, and construction engineering.

8.8 Grade High Strength Black Hexagon Socket Bolts Hexagon Socket Head Cup Screws

Name: 8.8 Grade High Strength Black Hexagon Socket Bolts Hexagon Socket Head Cup Screws
Brand: Hebei Tengyun New Materials Co., Ltd
SKU: 2093050952

Hebei, ChinaHebei Tengyun New Materials Co., Ltd

US$0.10

1 Piece

Sample price:US$0.10/piece.Request sample

Product profile

Customization

Available

Material

Carbon Steel

Type

Round Head

Model NO.

1-1

Groove

Hexagon

Connection

Common Bolt

Head Style

Round

Standard

DIN

Grade

8.8

Surface Treatment

Black

Use

Fastening Connection

Thread Type

Half Thread, Full Thread

Applicable Industries

Construction, Manufacturing

Transport Package

Container

Specification

1-30

Trademark

Huilin

Origin

Handan, Hebei

HS Code

0101101010

Production Capacity

50000

Key features

High Strength Grade: Made of carbon steel with heat treatment, offering strength grades 8.8, 10.9, and 12.9.

Corrosion Resistant: Blackening surface treatment forms a dense oxide film for long-term use in harsh environments.

Customizable Options: Supports full customization, minor customization, and flexible options based on samples or designs.

Versatile Applications: Widely used in mechanical equipment, furniture, electronics, and construction engineering.

Efficient Installation: Inner hexagon design allows easy tightening with wrenches or electric tools for improved efficiency.

Wide Specification Range: Available in sizes M2 to M12 with various lengths to meet diverse occasion needs.

Strict Quality Control: 100% visual and function inspection of finished products by dedicated QA/QC inspectors.

Reliable Manufacturer: Established in 2018 with 7 production lines and a 5000 sqm plant area in Hebei, China.

Company profile

R&D CapabilitiesProduction Process VisualizationQuality AssuranceHigh Repeat Buyers Choice

Hebei Tengyun New Materials Co., Ltd

Hebei, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 1 Year CertifiedNearest Port: Tianjin PortAverage Response Time: ≤4.57h

AI-Powered supplier vetting

SummaryThe supplier is explicitly identified as a professional technical supplier offering 3D software design and multiple customization modes. Its stated business scope covers power equipment and electronic components, machinery and metal-related products. Production information includes seven production lines and lead times within 15 working days in both peak and off-season periods. However, the supplier reports no available SDK, no in-stock capability, no overseas warehouse, no overseas agents or branches, and no valid manufacturing contract with affiliated subcontractors. Quality and supplier-management controls appear limited because finished products are checked by packing staff, production batches are not continuously reconciled, outsourcing procedures are absent, and no written service-supplier assessment procedures are maintained. Environmental assessment documentation and recent fire-drill activity are reported, but no specific certifications, customer cases, or after-sales service arrangements are...

Supplier typeThe supplier is explicitly described as a professional technical supplier. Its registered business scope spans power facilities and electronic components, mechanical parts, metal products, tools, structures, wire rope, chains, and related manufacturing and sales activities, indicating a broad industrial manufacturing and trading profile.

R&D capabilityThe supplier provides 3D software design services and is identified as having professional technical R&D capability, supporting some product-development capability. However, it explicitly has no available SDK, and the slices provide no information on patents, proprietary technologies, or measurable R&D outputs.

Production capacityThe supplier reports seven production lines and average lead times within 15 working days in both peak and off-season periods. Countervailing controls are weak: there is no valid manufacturing contract with affiliated subcontractors, no continuous production-quantity reconciliation, no outsourcing SOP, no in-stock capability, and finished products are checked by packing staff.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, and flexible customization. It also provides 3D software design services, indicating broad stated support for customized development and design work.