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DIN 912 Black Hexagon Socket Head Cap Bolt

DIN 912 black hexagon socket head cap screw – metric cylindrical head bolt with internal hexagon drive, manufactured to DIN 912 (withdrawn, superseded by ISO 4762), diameters M1.6–M42, coarse thread, thread tolerance 6g. Materials: carbon steel or alloy steel (e.g., 40Cr, SCM435, ML40CR), property classes 4.8, 8.8, 10.9, and 12.9 per ISO 898-1. Class 12.9: tensile strength 1,220 MPa, yield strength 1,098 MPa, hardness 39–44 HRC. Black finish: typically black oxide, providing basic corrosion resistance and non-reflective surface. Applications: machinery, hydraulic equipment, injection molding machines, die/fixture assembly, and general industrial fastening requiring high strength and compact installation.

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Product Details

DIN 912 Hexagon Socket Head Cap Screws | Black Oxide, Metric

Product Introduction
Metric socket head cap screws manufactured to DIN 912 (superseded by ISO 4762; equivalent to GB/T 70.1 and ASME B18.3.1M). The fastener features a cylindrical head with an internal hexagon drive, allowing installation in confined spaces where external wrenching heads cannot fit. Thread sizes M1.6 to M42 in standard metric coarse pitch. Property classes 4.8, 8.8, 10.9, and 12.9 per ISO 898-1. Standard finish is black oxide.

Material & Mechanical Properties

Class 4.8: low-carbon steel, tensile strength 400 MPa, yield strength 320 MPa.
Class 8.8: medium-carbon steel, tensile strength 800 MPa, yield strength 640 MPa.
Class 10.9: alloy steel, tensile strength 1040 MPa, yield strength 940 MPa.
Class 12.9: chromium-molybdenum alloy steel (SCM435 / 40Cr), oil-quenched and tempered, tensile strength ≥ 1220 MPa, yield strength ≥ 1098–1100 MPa, hardness 39–44 HRC.

Thread tolerance is 6g for classes 8.8 and 10.9, and 5g6g for class 12.9. Mechanical values are certified by lot with full heat traceability.

Geometry & Thread
Cylindrical head dimensions and thread lengths conform to DIN 912 / ISO 4762 tables. The internal hexagon drive is ISO 10664 compliant. Full-thread and partial-thread shank options are available.

Black Oxide Finish
Applied by chemical conversion, the black oxide coating produces a non-reflective matte black surface with mild corrosion resistance for indoor and dry environments. It does not materially alter thread dimensions, preserving the specified tolerance class. The finish provides initial lubrication during assembly and reduces the risk of thread galling. Because corrosion protection is limited, installed fasteners should be shielded from continuous moisture.

Application Suitability
Machinery housings, hydraulic manifolds, injection molding clamp plates, precision die and fixture assemblies, automotive engine and transmission components, and robotic joint fastening. The compact cylindrical head and internal hex drive make the screw suitable for high-strength joints in restricted access locations

DIN 912 Hexagon Socket Head Cap Screws | Black Oxide, Metric

Material & Mechanical Properties

Class 4.8: low-carbon steel, tensile strength 400 MPa, yield strength 320 MPa.
Class 8.8: medium-carbon steel, tensile strength 800 MPa, yield strength 640 MPa.
Class 10.9: alloy steel, tensile strength 1040 MPa, yield strength 940 MPa.
Class 12.9: chromium-molybdenum alloy steel (SCM435 / 40Cr), oil-quenched and tempered, tensile strength ≥ 1220 MPa, yield strength ≥ 1098–1100 MPa, hardness 39–44 HRC.

Thread tolerance is 6g for classes 8.8 and 10.9, and 5g6g for class 12.9. Mechanical values are certified by lot with full heat traceability.

FAQ

1. How do you let me trust you.

Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.

2. How about your price.

We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.

3. How do you control your quality.

Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods

4. Could you provide free samples?

For new customer, We can provide free samples for standard fastener, But the clients will pay the express

charges. For old customer, We will send you free samples and pay express charges by ourself.

5. What is your packing.

Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information

such as LOGO and pattern of customers.

6. What is your payment term

Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately.

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