DIN933 Hexagon Socket Head Cap Bolt

Specification

DIN 933 Hex Head Cap Screws

DIN 933 Hex Head Cap Screws are fully threaded, have external coarse machine screw threads and, like other hex head screws, are used with both tapped holes and nuts. Their dimensions are similar to ISO 4017 and are available in Class 8.8, 10.9 and 12.9 steel and Class 70 (A2-70, A4-70) stainless steel; less common stainless steel sizes may be Class 50. Zinc plating protects against corrosion while plain finish is unplated and can rust. A2 stainless steel is considered the same as 18-8 and A4 is essentially 316. Class 8.8 and 10.9 thread tolerance for plain finish is 6g and 6h for plated; stainless steel is 6g; right-hand threads are standard. Also known as hex head bolts and tap bolts, all lengths are fully threaded. Length is measured from under the head to the tip. DIN 933 Hex Head Cap Screws are similar to ISO 4017, JIS B1180 and ANSI B18.2.3.1M. In contrast, DIN 931 is partially threaded and DIN 961 has fine threads. (Note: Thread pitch, the distance between threads, is traditionally omitted for fasteners with coarse threads but is included here for reference.)

DIN 933 - Hexagon head bolts with thread up to head

Current norm: DIN EN 24017
Equivalent norms: ISO 4017; CSN 021103; PN 82105; UNI 5739; EU 24017

Legend:

l - length of bolt
d - the nominal diameter of the thread
k - head height
r - radius
e - the diameter of the circumscribed circle (not less than)
s - size hex head turnkey
c - thickness of the mounting collar
a - length undercut

Makings:QBH

Steel: 5.6,5.8,8.8,10.9,12.9
Stainless: A2,A4
Plastic: Plastic Pa
Non Ferrous: Brass
Thread: 6g

Table according to DIN 933

Process flow

Cold forging

Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment(if need) ➨ Finish ➨ Packing

Hot forging

Cutting material ➨ hot forging ➨ turning ➨ shrink diameter(half thread) ➨thread rolling ➨ make heat treatment(if need) ➨ Finish ➨ Packing

Materials and Chemical compstition

PACKING

QBH BULK

20-25KG/CTN,36CTNS/PALLET

20-30KG/BAGS,36BAGS/PALLET

ONE TON/BOXES

50KG/ IRON DRUM,12 IRON DRUMS/PALLET

QBH SMALL PACKING

Packing in small boxes according to customer’s requirements

Packing in plastic bag according to customer’s requirements

QBH PALLET TYPE

SOLID WOOD FUMIGATION PALLET

EURO Pallet

THREE SPLINT PALLET

WOODEN BOX

The advantages of QBH

• QBH brand sales to the main quality assurance.
• Years of export trade management, excellent service, word-of-mouth guarantee.
• By working with TUV,escort for quality.
• Customization of non-standard parts can be made according to customer's requirements and drawings.
• For quality customers,we can provide a certain credit period

Product application

The DIN 933 are a hexagon shaped screws, manufactured from steel. Grade 10.9 metric bolts are produced using DIN 933 bolt material such as, either medium carbon steel, medium carbon steel alloy or low carbon boron steel. In order to qualify as a grade DIN 933 bolt 10.9 metric bolts, the allot has to be processed by both quenching as well as tempering. Usually, the DIN 933 bolt 10.9 is used in applications for bolting large and forged parts, and the automotive industry as well.

Jiaxing City Qunbang Hardware Co., Ltd. (brand: QBH) is a fastener enterprise integrating production, design, sales, and after-sales service. The company is located in the Hangzhou-Jiaxing-Huzhou Plain, close to Shanghai, Ningbo, and Zhapu ports. Thanks to its superior geographical position and convenient transportation, the company has natural advantages for export business.

The company mainly produces high-strength fasteners, with bolts and nuts as its core products. The main standards include DIN, ANSI/ASME, JIS, UNI, ISO, AS, BS, GB, and others. Our products are widely used in bridges, roads, petroleum pipeline facilities, wind power generation, and steel structure projects. Carbon steel bolts are available in grades 4.8, 5.8, 6.8, 8.8, 10.9, and 12.9; nuts in grades 4, 6, 8, and 10. Stainless steel fasteners are mainly made of 201, 304, and 316. Since its establishment, QBH has undergone over ten years of development. We are equipped with comprehensive testing equipment and maintain good cooperation with SGS and TUV. Each batch of products is accompanied by a 3.1 or 3.2 certificate, further ensuring quality.

In 2017, we registered the trademark “QBH” in China, the EU, and the United States, and obtained six fastener product patents. We have also been awarded the Zhejiang Province Science and Technology Small and Medium-sized Enterprise certificate and the ISO9001:2000 certificate. As the company continues to grow and customers demand more diversified products, we have further strengthened our manufacturing capabilities.

In 2025, QBH officially expanded with two new factories:

• China Factory (Ningbo):
  NINGBO QB FASTENER MANUFACTURING CO., LTD.
  Add: No.100, Tianshen Road, Jiulonghu, Zhenhai, Ningbo City, Zhejiang Province, China

• Vietnam Factory:
  Công ty TNHH Sản xuất và Thương mại Khải Tín Huy
  Add: Street No.1, Thuan Dao Expanded Industrial Park, Long Dinh Ward, Can Duoc District, Long An, Vietnam

With the addition of these new facilities, QBH has significantly increased production capacity, optimized cost structures, and enhanced supply chain flexibility. Starting from 2015, QBH had already begun cooperating with several fastener enterprises to enrich product variety and improve pricing. Now, with our own manufacturing bases in both China (Ningbo) and Vietnam, we can offer even more competitive prices, shorter lead times, and better quality control across a wider range of products.

QBH has always been committed to providing customers with efficient, convenient services and high-quality products. Our mission is to create a pleasant trading experience for our customers, deeply participate in their construction projects, and make progress together. This means we continuously strive to offer better and more cost-effective solutions, helping customers stand out in a competitive market.

QBH promises to always provide you with excellent quality, efficient service, and very competitive prices. We believe our cooperation is not only business-based but also an opportunity to open new markets together on a win-win basis. We thank all our past customers for their great support and help, which have allowed us to grow step by step. At the same time, we look forward to establishing new business relationships with you in the near future.