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العربية DIN 603 carriage bolts wholesale supplier
XZ Fastener supplies DIN 603 carriage bolts for wholesale buyers, hardware distributors, construction suppliers, OEM assembly teams, and project purchasing departments. These metric round head square neck bolts are used when the exposed side needs a smooth head and the square neck must resist rotation during tightening. For stable wholesale purchasing, buyers should confirm size range, thread length, material, strength class, finish, nut and washer matching, carton labels, pallet packing, and inspection documents before confirming production.
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Quick Specs
What Buyers Should Know Before Sourcing DIN 603 Carriage Bolts
DIN 603 carriage bolts are different from ordinary industrial bolts. The smooth round head is installed on the exposed side, while the square neck under the head seats into wood, soft material, or a square hole to prevent rotation.
Wholesale buyers should not judge these bolts by diameter and length only. Head diameter, head height, square neck width, square neck depth, thread length, and coating thickness can affect assembly. If the order is supplied as a set, confirm compatible industrial nuts and washers before packing begins.
Common Purchasing Descriptions
Clear wholesale descriptions reduce quotation delays and help the supplier control packing accurately. Common examples include:
- 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, mixed metric sizes, zinc plated, barcode labels and export pallet required.
For broader supply planning, buyers can review XZ Fastener’s fastener products and related standard fasteners.
Detailed Specifications Table
| Specification Item | Typical Wholesale Requirement | Buyer Checkpoint |
|---|---|---|
| Product Type | DIN 603 carriage bolts, round head square neck type | Confirm standard reference and any customer drawing notes. |
| Size Range | Common metric sizes such as M5 to M20; other sizes according to order requirement. | Provide diameter, length, and thread length for each item. |
| Head and Neck | Round head with square neck below the head | Check head diameter, head height, square neck width, and neck depth. |
| Thread | Metric coarse thread is common; partial thread is typical for many sizes. | Specify if full thread or special thread length is required. |
| Strength Class | 4.6, 4.8, 8.8; stainless A2-70 or A4-70 | Match strength class with the connected material and mating nut grade. |
| Surface Finish | Plain, zinc plated, black oxide, hot dip galvanized, zinc flake, passivated stainless | Choose finish according to corrosion exposure, appearance, and cost target. |
| Inspection Documents | Material certificate, dimensional report, hardness report, tensile report, coating report upon request | State document requirements before purchase order confirmation. |
| Packing | Bulk carton, small box, bag set, barcode label, export pallet | Define carton weight, label format, item code, and mixed-carton rules. |
Material and Grade Explanation
Class 4.6 and 4.8 carbon steel carriage bolts are common for timber joints, fencing, furniture, hardware, and general construction use. They are practical where high tensile strength is not the main design requirement.
Class 8.8 can be selected for stronger assemblies, but buyers should review the nut grade, washer use, square neck seating, and connected material. Stainless A2-70 and A4-70 are used when corrosion resistance is required.
If the same wholesale order includes DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, or metric hex head bolts, use separate item codes and carton labels to avoid mixing during receiving and resale.
Surface Finish Selection Guide
| Finish | Typical Wholesale Use |
|---|---|
| Zinc Plated | Common for indoor hardware, brackets, furniture, and general distributor stock. |
| Black Oxide | Used for appearance-focused machinery parts where light protection is acceptable. |
| Hot Dip Galvanized | Used for outdoor fencing, guardrails, timber structures, and exposed hardware. |
| Zinc Flake | Selected where improved corrosion resistance and controlled coating thickness are specified. |
| Passivated Stainless | Used for stainless carriage bolts in wet, outdoor, or mildly corrosive environments. |
For finish comparison across product groups, buyers can review XZ Fastener’s coated fasteners. When ordering zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts with carriage bolts, keep finish descriptions separate on the RFQ.
Manufacturing and Quality Control
Wholesale supply requires repeatable production, not just an acceptable sample. For DIN 603 carriage bolts, factory control focuses on head forming, square neck dimensions, thread rolling, heat treatment where required, coating quality, and packing accuracy.
Control Points for Wholesale Orders
- Confirm DIN 603 size list, material, grade, finish, and nut or washer requirement.
- Check raw material grade and heat number traceability when required.
- Inspect round head diameter, head height, square neck width, and square neck depth.
- Verify thread pitch, thread length, go/no-go gauge fit, and burr condition.
- Apply heat treatment according to specified property class where applicable.
- Check coating appearance, coverage, adhesion, and thread function after finishing.
- Pack by size, grade, finish, item code, and batch number for warehouse control.
For non-standard head or square neck dimensions, XZ Fastener can review drawings through its customized service. Buyers comparing metric references can also use the DIN and ISO fastener standards guide.
Applications
DIN 603 carriage bolts are used where a smooth exposed head, anti-rotation neck, and nut-side tightening are needed. Common applications include:
- Wood-to-metal joints and timber construction.
- Fencing, gates, outdoor hardware, and guardrail assemblies.
- Furniture, racks, brackets, and light steel components.
- Trailer hardware, agricultural equipment, and repair stock.
- Wholesale distributor programs for metric carriage bolts in multiple sizes and finishes.
How to Get a Faster Quotation
Wholesale quotation is faster when the RFQ gives complete commercial and technical details. This also helps avoid wrong packing and document gaps before shipment.
| 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 | Class 4.8 carbon steel, Class 8.8 carbon steel, A2-70 stainless, A4-70 stainless. |
| Finish | Zinc plated, hot dip galvanized, black oxide, zinc flake, plain, or passivated stainless. |
| Nut and Washer Matching | Bolt only, or supplied as a set with nuts and washers. |
| Quantity | Pieces per size, carton quantity, annual demand, 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. |
For item review and quotation, buyers can contact XZ Fastener with drawings, photos, samples, or an itemized purchasing sheet.
FAQ
What is a DIN 603 carriage bolt?
It is a metric round head square neck bolt. The round head gives a smooth exposed surface, and the square neck helps prevent rotation while the nut is tightened.
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 grades are common for wholesale supply?
Class 4.6 and 4.8 are common for general hardware and construction use. Class 8.8 is available for stronger assemblies. Stainless A2-70 and A4-70 can be supplied for corrosion resistance.
Which finish should be used for outdoor applications?
Hot dip galvanized, zinc flake, or stainless steel may be used depending on exposure level, assembly fit, and buyer specification. Zinc plated carriage bolts are more common for indoor or light-duty use.
Why is the square neck dimension important?
The square neck must seat correctly in the mating material or hole. If it is too loose, the bolt may spin. If it is too large, installation can damage the connected part.
What information is needed for a wholesale quotation?
Please send the size list, material, strength class, finish, quantity, nut and washer requirement, packaging method, and inspection document requirements.
Send Your DIN 603 Wholesale Inquiry
Send your DIN 603 carriage bolt size list, finish, quantity, packaging method, nut and washer requirement, and inspection requirements. XZ Fastener can review wholesale 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