Русский 
English 
Español 
Tiếng Việt 
العربية DIN 603 carriage bolts factory
XZ Fastener supplies DIN 603 carriage bolts for industrial buyers, distributors, construction hardware suppliers, and OEM assembly projects. DIN 603 is a metric round head square neck bolt used where the head must sit smooth on the exposed side while the square neck helps resist rotation during tightening. For accurate factory quotation, buyers should confirm diameter, length, thread length, material, strength class, surface finish, nut pairing, packing method, and inspection documents before production.
![DIN 603 carriage bolts factory product illustration](data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="1200" height="760" viewBox="0 0 1200 760"%3E%3Crect width="1200" height="760" fill="%23eef4fa"/%3E%3Crect x="84" y="82" width="1032" height="596" rx="28" fill="%23ffffff" stroke="%23b8c9d9" stroke-width="4"/%3E%3Cg transform="translate(220 166)"%3E%3Cellipse cx="212" cy="190" rx="162" ry="96" fill="%230b2f57"/%3E%3Cellipse cx="212" cy="174" rx="132" ry="72" fill="%231f78b4"/%3E%3Crect x="154" y="252" width="116" height="92" rx="8" fill="%230b2f57"/%3E%3Crect x="270" y="278" width="430" height="74" rx="10" fill="%237b8793"/%3E%3Crect x="688" y="268" width="96" height="94" rx="10" fill="%230b2f57"/%3E%3Cg fill="%23d7e1eb"%3E%3Crect x="312" y="280" width="18" height="70"/%3E%3Crect x="356" y="280" width="18" height="70"/%3E%3Crect x="400" y="280" width="18" height="70"/%3E%3Crect x="444" y="280" width="18" height="70"/%3E%3Crect x="488" y="280" width="18" height="70"/%3E%3Crect x="532" y="280" width="18" height="70"/%3E%3Crect x="576" y="280" width="18" height="70"/%3E%3Crect x="620" y="280" width="18" height="70"/%3E%3C/g%3E%3Crect x="112" y="418" width="662" height="54" rx="12" fill="%23123f6d"/%3E%3Crect x="166" y="492" width="500" height="34" rx="8" fill="%23b8c9d9"/%3E%3C/g%3E%3Ctext x="600" y="636" text-anchor="middle" font-family="Arial, Helvetica, sans-serif" font-size="34" font-weight="700" fill="%230b2f57"%3EDIN 603 Carriage Bolts%3C/text%3E%3C/svg%3E)
Quick Specs
What Buyers Should Know Before Sourcing DIN 603 Carriage Bolts
DIN 603 carriage bolts are easy to recognize: a smooth round head on top, a square neck below the head, and a metric threaded shank. The square neck is designed to seat into wood, square holes, or soft mating material so the bolt does not spin during nut tightening.
The common mistake is treating carriage bolts like ordinary industrial bolts. The head height, square neck size, neck depth, thread length, and mating surface all affect installation. When the joint uses a nut and washer, buyers should also confirm compatible industrial nuts and flat washers.
Common Purchasing Descriptions
A clear purchase description helps avoid wrong production and packing delays. Buyers often specify DIN 603 carriage bolts like this:
- DIN 603 carriage bolt, M8 x 60, Class 4.8, zinc plated, supplied with nut and washer.
- DIN 603 round head square neck bolt, M10 x 80, Class 8.8, hot dip galvanized, bulk carton packing.
- DIN 603 carriage bolt, M12 x 100, stainless steel A2-70, passivated finish, small box packing.
- DIN 603 carriage bolts, assorted metric sizes, zinc plated, export pallet, dimensional report required.
For wider purchasing programs, buyers can review XZ Fastener’s fastener products and related standard fasteners.
Detailed Specifications Table
| Specification Item | Typical Requirement | Buyer Checkpoint |
|---|---|---|
| Тип продукта | DIN 603 carriage bolts, round head square neck type | Confirm DIN 603 standard and any drawing-based deviations. |
| Диапазон размеров | Common metric sizes such as M5 to M20; other sizes according to order requirement. | Specify diameter, length, and thread length clearly. |
| Head and Neck | Round head with square neck below head | Check head diameter, head height, square neck width, and neck depth for installation fit. |
| Thread | Metric coarse thread is common; thread length depends on size and order requirement. | Confirm if full thread or partial thread is required for the application. |
| Strength Class | 4.6, 4.8, 8.8; stainless A2-70 or A4-70 | Match the strength class to joint load and mating nut grade. |
| Обработка поверхности | Plain, zinc plated, black oxide, hot dip galvanized, zinc flake, passivated stainless | Choose finish according to corrosion exposure and appearance requirement. |
| Inspection Documents | Material certificate, dimensional report, hardness report, tensile test, coating report upon request | List document needs before production starts. |
| Packing | Bulk carton, small box, bag set with nuts and washers, export pallet | Define carton weight, label details, and whether sets are required. |
Material and Grade Explanation
Low and medium carbon steel carriage bolts are common for general construction hardware, furniture, fencing, and wood-to-metal fastening. Class 4.6 and 4.8 are widely used where extreme tensile strength is not required.
Class 8.8 can be selected for stronger assemblies, but the mating nut, washer, and connected material must be checked. Stainless A2 and A4 are used when corrosion resistance is more important than carbon steel strength.
If the same shipment includes DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, or metric hex head bolts, each item should carry separate labels and packing references to prevent warehouse mixing.
Surface Finish Selection Guide
| Finish | Typical Use |
|---|---|
| Zinc Plated | General indoor hardware, furniture, brackets, and light-duty construction use. |
| Black Oxide | Machinery or appearance-focused applications where light protection is acceptable. |
| Hot Dip Galvanized | Outdoor fencing, timber structures, guardrails, and exposed construction hardware. |
| Zinc Flake | Improved corrosion resistance with controlled coating thickness where specified. |
| Passivated Stainless | Stainless carriage bolts for outdoor, wet, or mildly corrosive environments. |
For coating choices across multiple fastener types, see XZ Fastener’s coated fasteners. Buyers ordering zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts with carriage bolts should separate finish codes in the RFQ.
Manufacturing and Quality Control
Factory control for DIN 603 carriage bolts focuses on stable forming, accurate square neck dimensions, correct thread rolling, suitable heat treatment where required, and clean surface finishing. A smooth round head must be free from cracks, heavy dents, and poor forming marks.
Key Control Points
- Review DIN 603 size, drawing notes, material, grade, finish, and packing requirement.
- Check raw material grade and heat number traceability when required.
- Control round head diameter, head height, square neck width, and neck depth.
- Verify thread pitch, thread length, thread fit, and burr condition.
- Apply heat treatment where the specified strength class requires it.
- Inspect finish appearance, coating coverage, and thread function after coating.
- Pack by size, grade, finish, item code, and batch number for easier receiving control.
For special square neck dimensions or non-standard carriage bolt drawings, XZ Fastener can review requirements through its customized service. Buyers comparing standards can also refer to the DIN and ISO fastener standards guide.
Приложения
DIN 603 carriage bolts are used where a smooth exposed head, anti-rotation neck, and simple nut-side tightening are needed. Common applications include:
- Wood-to-metal and timber construction joints.
- Fencing, gates, guardrails, and outdoor hardware.
- Furniture, racks, brackets, and light steel assemblies.
- Agricultural equipment, trailer hardware, and maintenance stock.
- Distributor programs requiring metric carriage bolts in multiple sizes and finishes.
How to Get a Faster Quotation
For a faster factory quotation, send a complete RFQ instead of only a product name. The details below help confirm cost, production route, packing, and inspection scope.
| Information Needed | Example or Note |
|---|---|
| Size List | M6 x 40, M8 x 60, M10 x 80, M12 x 100, with thread length if critical. |
| Material and Grade | Carbon steel Class 4.8, carbon steel Class 8.8, stainless A2-70, stainless A4-70. |
| Finish | Zinc plated, hot dip galvanized, black oxide, zinc flake, plain, or passivated stainless. |
| Nut and Washer Requirement | Bolt only, or supplied as a set with nuts and washers. |
| Quantity | Pieces per size, annual demand, trial order, or container order plan. |
| Packing | Bulk cartons, small boxes, bag sets, barcode labels, pallet requirement. |
| Inspection | Dimensional report, material certificate, hardness report, tensile report, coating report. |
To begin order review, buyers can contact XZ Fastener with drawings, samples, photos, or an itemized purchase list.
Часто задаваемые вопросы
What is a DIN 603 carriage bolt?
It is a metric round head square neck bolt. The round head gives a smooth exposed surface, while the square neck helps prevent bolt rotation during nut tightening.
Can DIN 603 carriage bolts be supplied with nuts and washers?
Yes. They can be supplied as bolts only or packed as sets with compatible nuts and washers according to order requirement.
Which finishes are common for DIN 603 carriage bolts?
Zinc plated, hot dip galvanized, black oxide, plain, zinc flake, and passivated stainless finishes are common. Outdoor use often requires stronger corrosion protection than indoor hardware.
What grades are usually ordered?
Class 4.6 and 4.8 are common for general hardware and construction use. Class 8.8 may be selected for stronger assemblies. Stainless A2-70 and A4-70 can be supplied for corrosion resistance.
Why is the square neck dimension important?
The square neck must fit the mating material or hole correctly. If it is too loose, the bolt may spin. If it is too large, installation can damage the connected part.
What should I send for a DIN 603 factory quotation?
Please send the size list, material, strength class, finish, quantity, nut and washer requirement, packing method, and inspection requirements. A drawing or sample is useful for non-standard details.
Send Your DIN 603 Carriage Bolt Inquiry
Send your DIN 603 carriage bolt size list, finish, quantity, packaging method, nut and washer requirement, and inspection requirements. XZ Fastener can review carriage bolt factory orders together with related DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, metric hex head bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, hot dip galvanized DIN 933 bolts, and other industrial fasteners according to order requirement.
Request a Quote from XZ Fastener