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Hex Nut

Carbon Steel Heavy Hex Nut

Heavy hex nuts in carbon steel, heat-treated to property classes 8, 10, and 12 under ISO 898-2. The increased width across flats and greater thickness compared to standard nuts raise proof load values, matching bolt tensile requirements up to class 12.9.

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Product Details

Product Introduction

Heavy hex nuts in carbon steel, heat-treated to property classes 8, 10, and 12 under ISO 898-2. The increased width across flats and greater thickness compared to standard nuts raise proof load values, matching bolt tensile requirements up to class 12.9.

Material & Mechanical Properties
Forged from medium carbon steel; quenched and tempered per grade. Proof stress and hardness values are verified by lot with available mill test reports (MTRs).

Class 8: Compatible with class 8.8 bolts.
Class 10: Proof load aligns with class 10.9 bolt ultimate strength.
Class 12: Service-rated for class 12.9 high-tensile assemblies.

Dimensional Specifications
Conform to ASME B18.2.2 heavy hex and ISO 4033 thickness series. Coarse metric thread to ISO 724 as standard; fine thread series optional. The wider bearing face distributes clamp load and limits embedding in structural steel plates.

Surface Protection
Plain oiled, zinc electroplated (ASTM B633 Fe/Zn 5–8 μm), or hot-dip galvanized (ASTM A153). Galvanized nuts are supplied with overtapped threads to accommodate bolt coating allowance without assembly interference.

Assembly & Torque Control
Installation requires a calibrated torque wrench and controlled preload, following established torque-reference values for the bolt’s property class and surface condition. Coarse pitch and heavy hex geometry reduce stripping risk and permit higher installation torque before thread yield.

Application Suitability
Structural steel connections to EN 14399, bridge and building steelwork, heavy machinery mounting, high-stress automotive chassis joints, and other bolted assemblies where proof-load matched nut performance is specified.

Technical Parameters

Place of Origin	CHINA
Standard	Carbon Steel Heavy Hex Nut
HS CODE	7318160000
Brand Name	QBH
Certification	ISO9001
Material	35K, 40Cr, 35CrMo, SCM435, etc.
Size	M3-M90
Production Process	Cold forging and hot forging
Class	4/ 6/ 8/ 10
Delivery Time	Within 30 Days

Product Introduction

Heavy hex nuts in carbon steel, heat-treated to property classes 8, 10, and 12 under ISO 898-2. The increased width across flats and greater thickness compared to standard nuts raise proof load values, matching bolt tensile requirements up to class 12.9.

Material & Mechanical Properties
Forged from medium carbon steel; quenched and tempered per grade. Proof stress and hardness values are verified by lot with available mill test reports (MTRs).

Class 8: Compatible with class 8.8 bolts.
Class 10: Proof load aligns with class 10.9 bolt ultimate strength.
Class 12: Service-rated for class 12.9 high-tensile assemblies.

Dimensional Specifications
Conform to ASME B18.2.2 heavy hex and ISO 4033 thickness series. Coarse metric thread to ISO 724 as standard; fine thread series optional. The wider bearing face distributes clamp load and limits embedding in structural steel plates.

Surface Protection
Plain oiled, zinc electroplated (ASTM B633 Fe/Zn 5–8 μm), or hot-dip galvanized (ASTM A153). Galvanized nuts are supplied with overtapped threads to accommodate bolt coating allowance without assembly interference.

Assembly & Torque Control
Installation requires a calibrated torque wrench and controlled preload, following established torque-reference values for the bolt’s property class and surface condition. Coarse pitch and heavy hex geometry reduce stripping risk and permit higher installation torque before thread yield.

Application Suitability
Structural steel connections to EN 14399, bridge and building steelwork, heavy machinery mounting, high-stress automotive chassis joints, and other bolted assemblies where proof-load matched nut performance is specified.

Technical Parameters

Place of Origin	CHINA
Standard	Carbon Steel Heavy Hex Nut
HS CODE	7318160000
Brand Name	QBH
Certification	ISO9001
Material	35K, 40Cr, 35CrMo, SCM435, etc.
Size	M3-M90
Production Process	Cold forging and hot forging
Class	4/ 6/ 8/ 10
Delivery Time	Within 30 Days

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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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