How is the quality controlled?

We perform 100% inspection (visual and functional) on finished products and ensure traceability of raw materials.

What payment terms are accepted?

We accept LC (Letter of Credit) and T/T (Telegraphic Transfer) as terms of payment.

What are the common applications for these bolts?

They are used for fixing items in place, material transmission, and applications involving large drill bits in machinery and construction.

Square Head Knurled Bolt Double Thread Bolts Hex Bolts with Knurling Black Coating

Name: Square Head Knurled Bolt Double Thread Bolts Hex Bolts with Knurling Black Coating
Brand: Shanghai Kinsom Precision Hardware Co., Ltd.
SKU: 943812185

Shanghai, ChinaShanghai Kinsom Precision Hardware Co., Ltd.

US$0.01-1.00

100,000 Pieces

Sample price:US$60.00/bag.Request sample

Product profile

Customization

Available

Material

High Strength Steel

Type

Hexagon Head

Connection

Common Bolt

Head Style

Round

Standard

DIN, ANSI, GB, JIS, BSW, GOST

Grade

10.9

Application

Machinery, Chemical Industry, Environmental, Building

Finish

Passivation

Transport Package

Standard Packaging

Specification

M4 M5 M6 M10 M12

Trademark

custom label

Origin

Shanghai China

HS Code

7318150000

Production Capacity

3000000PCS/Month

Key features

Extensive Material Options: Available in Stainless Steel 304/316, Carbon Steel, Alloy Steel, Aluminum, Brass, and Titanium.

Customizable Dimensions: Shank diameter M2.5-M30 and length 6-120MM can be customized to specific needs.

OEM and ODM Service: Full customization from samples or designs; send drawings for tailored fastener solutions.

High Hardness Grades: Hardness ranges from grade 4.8 to 12.9 to meet diverse strength requirements.

Versatile Surface Treatment: Options include Zinc, Nickel, Gold, Brass, Black Oxide, and Passivation.

Robust Corrosion Resistance: Salt spray test duration from 24 hours up to 1000 hours for enhanced durability.

100% Quality Inspection: Finished products undergo visual and functional inspection with traceable raw materials.

Multiple Head Types: Available in Flat, Oval, Truss, Round, Button, Pan, Fillister, and Square heads.

Company profile

Quality Assurance100% Finished Products InspectionQA/QC InspectorsFull Customization

Shanghai Kinsom Precision Hardware Co., Ltd.

Shanghai, China

Business Type: Manufacturer/Factory, Trading Company, Group Corporation CertifiedR&D Capacity: ODM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc.Export Year: 2014-02-18 CertifiedNearest Port: Shanghai PortAverage Response Time: ≤24h

AI-Powered supplier vetting

SummaryThe supplier is a manufacturing-oriented fastener and precision-machining supplier rather than a professional technical or 3D software design provider. It offers broad customization, including sample-based, design-based, full, minor, and flexible customization, and operates more than 10 production lines with multiple machining and forming machines. Finished-product inspection instructions are uniformly followed, with quality assurance and raw-material traceability identified. However, the supplier has no written procedures or records for supplier-service assessment, corrective and preventive actions, or customer complaint handling. It has no overseas agents, branches, warehouse, showroom, or offline trade-show participation. Financial records are indicated for 2022–2024, but no assessable financial results are provided. Innovation evidence is limited: no new products were reported in the past year, although ODM services are available. No certification or customer-case evidence is provided.

After-Sales capabilityThe supplier has in-stock service capacity and states that quality assurance and raw-material traceability are in place. However, it has no written procedures or records for corrective and preventive actions or effective customer-complaint handling, and it has no overseas agents, branches, warehouse, or showroom, limiting documented after-sales support infrastructure.

R&D capabilityThe supplier reports no new products during the past year, no SDK availability, and no professional technical-supplier or 3D software-design capability. It does provide ODM services and has one year of total R&D engineer experience reported, but the overall evidence does not demonstrate strong ongoing innovation capacity.

Production capacityThe supplier operates more than 10 production lines and lists diverse forming, machining, drilling, grinding, and cutting equipment for nails, screws, bolts, and CNC parts. It reports in-stock capacity, one-month average lead times in both peak and off-season periods, uniformly followed finished-product inspection instructions, and 11 years of export experience. However, it lacks a valid manufacturing-capacity contract with associated subcontractors, so the evidence supports substantial production capability but not fully controlled outsourced capacity.

Customization capabilityThe supplier explicitly offers customization from samples, customization from customer designs, full customization, minor customization, and flexible customization. ODM service is also available, providing direct evidence of broad product customization capability despite the absence of 3D software design services.