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Carriage Bolt
DIN603 Half Thread Square Neck Carriage Bolt
DIN 603 half thread square neck carriage bolt – metric cup head bolt with square neck under head and partial thread, diameters M5–M20 with ISO coarse pitch. Materials: carbon steel property classes 4.6, 4.8, 8.8, 10.9, 12.9 per ISO 898-1 or stainless steel A2/A4 grades per ISO 3506-1. Square neck embeds into matching hole providing anti-rotation during nut tightening. Thread length: b = 2d + 6 for L ≤ 125 mm; b = 2d + 12 for L > 125 mm. Finishes: zinc plating, hot-dip galvanizing, black oxide, Dacromet, PTFE/Xylan. Applications: timber-to-timber and timber-to-steel connections, truck platforms, shipbuilding, scaffolding, exhibition construction, heavy-duty transport crates, and marine shipping containers.
DIN 603 half thread square neck carriage bolt – metric cup head bolt with square neck under head and partial thread, diameters M5–M20 with ISO coarse pitch. Materials: carbon steel property classes 4.6, 4.8, 8.8, 10.9, 12.9 per ISO 898-1 or stainless steel A2/A4 grades per ISO 3506-1. Square neck embeds into matching hole providing anti-rotation during nut tightening. Thread length: b = 2d + 6 for L ≤ 125 mm; b = 2d + 12 for L > 125 mm. Finishes: zinc plating, hot-dip galvanizing, black oxide, Dacromet, PTFE/Xylan. Applications: timber-to-timber and timber-to-steel connections, truck platforms, shipbuilding, scaffolding, exhibition construction, heavy-duty transport crates, and marine shipping containers.
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Product Details
Product Introduction
Metric carriage bolts manufactured to DIN 603, product grade C. The fastener combines a round (mushroom) head, a square neck directly beneath the head, and a partial thread configuration. Thread sizes M5 to M20 in metric coarse pitch per ISO 261. The square neck engages a punched or broached square hole to provide positive anti-rotation locking while the nut is tightened from the opposite side. Material options include carbon steel property classes 4.6, 4.8, 8.8, and 10.9, plus stainless steel A2-70 and A4-80. Surface finishes: zinc plating, hot-dip galvanizing (HDG), black oxide, or Dacromet.
Material & Mechanical Properties
Carbon steel grades conform to ISO 898-1: class 4.6 (tensile 400 MPa, yield 240 MPa, low-carbon steel C1008–C1022); class 8.8 (tensile 800 MPa, yield 640 MPa, quenched and tempered medium-carbon or boron steel). Stainless grades to ISO 3506-1: A2-70 (tensile 700 MPa), A4-80 (tensile 800 MPa) for improved pitting resistance in chloride environments. Mechanical values are certified by lot with full traceability.
Geometry & Thread
DIN 603 half-thread geometry: thread length b=2d+6 mm for bolt lengths L≤125 mm, and b=2d+12 mm for L>125 mm. The unthreaded shank diameter equals the nominal thread diameter. Head diameter, head height, square neck length, and square width follow DIN 603 dimensional tables from M5 to M20. Equivalent standards: ISO 8677, BS 4933, NEN 303.
Anti-Rotation Locking
The square neck is designed to seat in a square punched or broached hole. Where a square hole is not practical, the neck may be driven into a round hole with a diameter approximating the square diagonal (about 1.2×d). The embedded neck prevents bolt rotation up to the nut’s proof load. In timber connections, the square neck compresses the wood fibres to achieve locking without a pre-formed square hole. The unthreaded shank length should exceed the thickness of the fastened material so that any shear plane intersects the plain shank rather than the threaded section.
Corrosion Protection
Standard finishes include electroplated zinc for indoor and sheltered outdoor use, hot-dip galvanizing for structural and exposed environments, black oxide for appearance and mild protection, and Dacromet for high corrosion resistance and freedom from hydrogen embrittlement in higher-strength classes.
Application Suitability
Used in timber-to-steel, timber-to-timber, and steel-to-steel connections where a smooth round head is required on the finished face and anti-rotation locking is needed on the blind side. Typical applications include wooden structures, fencing, agricultural equipment, machinery guards, and general fabrication. Carbon steel class 8.8 is specified for higher-strength joints; stainless grades are used in food, marine, and architectural applications.
Technical Parameters
| Place of Origin | CHINA |
| Standard | DIN603 Half Thread Square Neck Carriage Bolt |
| HS CODE | 7318159001 |
| Brand Name | QBH |
| Certification | ISO9001 |
| Material | 35K, 40Cr, 35CrMo, SCM435, etc. |
| Size | M3-M64 |
| Production Process | Cold forging≤300mm, Hot forging≤1000mm |
| Class | 4.8/ 6.8/ 8.8/ 10.9/ 12.9 |
| Delivery Time | Within 30 Days |
Product Introduction
Metric carriage bolts manufactured to DIN 603, product grade C. The fastener combines a round (mushroom) head, a square neck directly beneath the head, and a partial thread configuration. Thread sizes M5 to M20 in metric coarse pitch per ISO 261. The square neck engages a punched or broached square hole to provide positive anti-rotation locking while the nut is tightened from the opposite side. Material options include carbon steel property classes 4.6, 4.8, 8.8, and 10.9, plus stainless steel A2-70 and A4-80. Surface finishes: zinc plating, hot-dip galvanizing (HDG), black oxide, or Dacromet.
Material & Mechanical Properties
Carbon steel grades conform to ISO 898-1: class 4.6 (tensile 400 MPa, yield 240 MPa, low-carbon steel C1008–C1022); class 8.8 (tensile 800 MPa, yield 640 MPa, quenched and tempered medium-carbon or boron steel). Stainless grades to ISO 3506-1: A2-70 (tensile 700 MPa), A4-80 (tensile 800 MPa) for improved pitting resistance in chloride environments. Mechanical values are certified by lot with full traceability.
Geometry & Thread
DIN 603 half-thread geometry: thread length b=2d+6 mm for bolt lengths L≤125 mm, and b=2d+12 mm for L>125 mm. The unthreaded shank diameter equals the nominal thread diameter. Head diameter, head height, square neck length, and square width follow DIN 603 dimensional tables from M5 to M20. Equivalent standards: ISO 8677, BS 4933, NEN 303.
Anti-Rotation Locking
The square neck is designed to seat in a square punched or broached hole. Where a square hole is not practical, the neck may be driven into a round hole with a diameter approximating the square diagonal (about 1.2×d). The embedded neck prevents bolt rotation up to the nut’s proof load. In timber connections, the square neck compresses the wood fibres to achieve locking without a pre-formed square hole. The unthreaded shank length should exceed the thickness of the fastened material so that any shear plane intersects the plain shank rather than the threaded section.
Corrosion Protection
Standard finishes include electroplated zinc for indoor and sheltered outdoor use, hot-dip galvanizing for structural and exposed environments, black oxide for appearance and mild protection, and Dacromet for high corrosion resistance and freedom from hydrogen embrittlement in higher-strength classes.
Application Suitability
Used in timber-to-steel, timber-to-timber, and steel-to-steel connections where a smooth round head is required on the finished face and anti-rotation locking is needed on the blind side. Typical applications include wooden structures, fencing, agricultural equipment, machinery guards, and general fabrication. Carbon steel class 8.8 is specified for higher-strength joints; stainless grades are used in food, marine, and architectural applications.
Technical Parameters
| Place of Origin | CHINA |
| Standard | DIN603 Half Thread Square Neck Carriage Bolt |
| HS CODE | 7318159001 |
| Brand Name | QBH |
| Certification | ISO9001 |
| Material | 35K, 40Cr, 35CrMo, SCM435, etc. |
| Size | M3-M64 |
| Production Process | Cold forging≤300mm, Hot forging≤1000mm |
| Class | 4.8/ 6.8/ 8.8/ 10.9/ 12.9 |
| Delivery Time | Within 30 Days |
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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