DIN 912 304 Stainless Steel 12.9 Grade Alloy Steel China Factory Hex Socket Cap Screws

Short Description:

30-year China fastener factory making DIN 912 hex socket head cap screws in all strength grades. Standard metric and inch sizes kept in bulk stock, custom lengths and special profiles accepted for industrial bulk orders. Direct factory pricing, steady batch quality.

Product Detail

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Product Overview

We stock and produce a full line of DIN 912 / ISO 4762 hex socket head cap machine screws — the standard high-strength fastener for industrial assembly work. All standard runs come off fully automatic cold heading and thread rolling lines, so thread profile stays uniform and size tolerance holds steady within 0.04μm. For odd parts like low-profile heads, step shanks or custom shoulders, we run in-house CNC turning to match your exact drawing.

Core Practical Advantage

1 High torque without easy stripping

Deep internal hex recess spreads tightening force evenly across the slot walls. Works with standard Allen wrenches and power drivers, no head deformation even on high-torque automatic assembly lines.

2 Flush fit for clean assembly

Cylindrical head sinks fully into counterbore holes, leaving a flat smooth surface. No sharp edges sticking out to catch on moving parts or ruin the product appearance, great for compact equipment and visible panels.

3 Stable clamping under vibration

Cold-rolled threads have consistent pitch and smooth engagement, so each screw delivers even clamping force. Loosening risk stays low on running machinery and equipment with long-term vibration.

4 One head style, wide use cases

Available in stainless steel for corrosion resistance and alloy steel for heavy load bearing. Covers everything from small electronic enclosures to heavy structural frame connections.

Socket Head Types & Drive Details

We carry multiple socket head configurations to fit different space and load requirements, all with standard hex socket drive for universal tool compatibility:

Standard socket cap head (DIN 912)

Most widely used high-strength style. Full cylindrical head for maximum drive strength, go-to choice for general machinery and structural joints.

Low-profile socket cap (DIN 7984)

Reduced head height for tight spots where standard heads won’t fit. Common for thin electronics panels and compact enclosure builds.

Button socket head (ISO 7380)

Rounded low-dome head with a smooth finish. Used for furniture, consumer products and exterior visible assemblies.

Countersunk socket head (DIN 7991)

Flat countersunk profile for fully flush surface mounting. Fits decorative panels and security equipment builds.

Flange socket head

Built-in flange face spreads clamping pressure wider. Removes the need for separate washers on sheet metal assembly work.

Custom head dimensions and exclusive drive profiles can be made strictly to customer drawings.

Full Size Range

Both metric and imperial sizing systems are available for global markets:

Metric sizes: M1.6 to M12, standard lengths 3mm to 100mm. Most M2 through M8 sizes are kept in 3-5 ton bulk stock in our warehouse, ready to ship same or next day for rush orders.
Imperial sizes: 4-40, 6-32, 8-32, 10-24, 1/4-20 and other common UNC/UNF specs, mainly for North American and European export projects.

Custom thread lengths, reduced shanks, shoulder structures and special head modifications are all workable. Standard material grades have no strict minimum order quantity — small trial runs are acceptable.

Material & Surface Finish Options

Three core material lines with matched surface treatments, pick based on your load demand, working environment and budget:

304 / 316 stainless steel (A2-70 / A4-80)

Standard natural passivated finish, electro-polishing available on request. 304 grade works for general indoor and outdoor use; 316 grade handles chloride corrosion better for coastal, chemical and marine sites.

Carbon & alloy steel (8.8 / 10.9 / 12.9 grade)

Finishes include clear zinc, yellow zinc, black oxide and dacromet. 12.9 grade SCM435 alloy steel is the standard pick for heavy machinery, mold bases and high-load structural joints.

Brass

Natural polished finish with good electrical conductivity, used for electrical terminals, instrument parts and decorative fastening.

All raw steel comes from well-known domestic mills with full batch traceability. Official material test certificates (MTC) can be provided with every order.

Main Application Fields

These hex socket cap screws work well for both manual assembly stations and high-speed automatic production lines, and are widely used in:

Industrial machinery, automation equipment, gearbox and motor mounting
Mold manufacturing, fixture and jig building, precision tooling setups
Automotive components, EV battery packs, chassis and interior trim fastening
Server racks, telecom cabinets, power supply units and industrial control enclosures
Solar PV mounting brackets, new energy storage systems and outdoor equipment
Furniture hardware, consumer products and decorative structural assemblies

In-House Quality Control Steps

Every production batch goes through full inspection before leaving the factory:

All finished screws run through automatic optical sorting machines for 100% dimensional check, covering socket depth, head height, thread diameter and total length. No manual spot-check shortcuts.
Random sampling tests for tensile strength, torque resistance, salt spray performance and thread fit with go/no-go gauges.
Extra checks like hardness testing, coating thickness measurement and drive fit verification can be added for custom orders on request.

Certifications: ISO9001, IATF16949, ISO14001, RoHS, REACH

About YH Fastener

YH Fastener started up in 1996, close to 30 years focused strictly on fastener production. Based in Dongguan with two production sites totaling over 20,000 sqm, we run 200+ sets of automatic cold heading, thread rolling and inspection gear, putting out over 1 million pieces per day.

Our products ship to more than 90 countries across Europe, North America, Southeast Asia and the Middle East. We provide full OEM/ODM custom service, from initial drawing evaluation and sample making all the way to mass production delivery.

Inquiry Guide

If you’re looking for a reliable hex socket machine screw supplier, send over your detailed requirements: thread size, head type, material grade, surface finish and estimated order quantity. Our sales team will get back to you with a clear quotation and lead time within 2 working hours.

Free stock samples are available — you just cover the shipping cost, and sample fees can be credited back on your first bulk order. Small trial orders start from 500 pieces for standard specs. Feel free to reach out for technical support or custom solution discussion.

FAQ

Q: Do you have standard DIN 912 socket cap screws in stock?

A: Yes, common M2-M8 sizes in 304 stainless and 8.8 grade steel are kept in bulk stock, ready for fast shipment.

Q: What strength grades do you offer for steel socket screws?

A: We have 8.8, 10.9 and 12.9 grade carbon and alloy steel options, with official strength test reports available.

Q: Can you make custom-length socket cap screws?

A: Yes, custom lengths from 3mm to 100mm are workable. Standard material grades have no strict MOQ.

Q: What surface finishes are available for carbon steel socket screws?

A: Clear zinc, yellow zinc, black oxide, dacromet and nickel plating are all available on request.

Q: Can you provide material test reports with orders?

A: Yes, official MTC and third-party test reports can be provided with every order as needed.

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