carbon steel carriage bolts exporter
XZ Fastener exports carbon steel carriage bolts for importers, distributors, hardware wholesalers, construction suppliers, and project buyers that need round head square neck bolts with consistent dimensions and export-ready packing. These bolts can be supplied as DIN 603 carriage bolts, coach bolts, mushroom head square neck bolts, or custom anti-rotation bolts according to order requirement. Carbon steel options include low carbon and medium carbon steel with zinc plating, hot dip galvanizing, black oxide, or plain oil finishes. Buyers can source DIN 603 carbon steel carriage bolts with matching nuts, washers, labels, inspection documents, and shipment details confirmed before production.
Standard
DIN 603, coach bolt types, drawing-based parts
Strength
Common carbon steel grades; higher grades by order review
Material
Carbon steel, low carbon steel, medium carbon steel
Finish
Zinc plated, hot dip galvanized, black oxide, plain oil
Application
Wood-to-metal, timber, construction, fencing, machinery
What Buyers Should Know Before Sourcing Carbon Steel Carriage Bolts
Export sourcing should start with the correct bolt geometry. Carriage bolts use a smooth round head and a square neck below the head, which helps resist rotation during tightening. Buyers should confirm whether they need DIN 603 dimensions, inch coach bolt dimensions, a special square neck, standard thread length, full thread, or a drawing-based design.
Confirm head and square neck details
Round head diameter, head height, square neck width, square neck height, shank length, and thread length should match the hole and mating material. Related carriage bolt products can be reviewed when buyers need standard and custom options.
Separate carriage bolts from hex bolts
Carriage bolts are not the same as DIN 933 full thread hex bolts or metric hex head bolts. If the purchase order also includes Grade 8.8 carbon steel hex bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, or hot dip galvanized DIN 933 bolts, each line should be specified separately.
Prepare export packing requirements early
Importers often need carton weight limits, barcode labels, pallet marks, private labels, or mixed-size separation. Confirming these details before production helps reduce receiving and warehouse sorting problems after shipment.
Common Purchasing Descriptions
Clear purchasing descriptions help avoid wrong head shape, unsuitable finish, or missing packing information. Common buyer wording includes:
- DIN 603 carbon steel carriage bolts, M8 x 60, zinc plated, round head square neck, export carton packing.
- Carbon steel coach bolts M10 x 100, hot dip galvanized, with matching hex nuts and flat washers.
- Mushroom head square neck bolts, low carbon steel, black oxide finish, bulk carton packing.
- Round head square neck bolts according to drawing, carbon steel, controlled neck height and thread length.
- Zinc plated carbon steel carriage bolts for timber brackets, fencing hardware, and construction hardware stock.
- Mixed fastener shipment with carbon steel carriage bolts, DIN 933 full thread hex bolts, flat washers, and hex nuts packed by item and size.
If the order includes carriage bolts, hex nuts, washers, and other bolt types, separate every item by standard, size, grade, finish, packing unit, and inspection requirement.
Detailed Specifications Table
| Item | Specification | Export Purchasing Notes |
|---|---|---|
| Product name | Carbon steel carriage bolts | Also called coach bolts, mushroom head square neck bolts, or round head square neck bolts. |
| Common standards | DIN 603, ANSI/ASME coach bolt types, drawing-based parts | State the exact standard because head and neck dimensions may differ. |
| Diameter range | Common metric sizes such as M5-M20; other sizes reviewed by order | Actual range depends on length, grade, finish, and production method. |
| Length | Standard lengths or custom lengths according to drawings | Confirm standard thread length, full thread, partial thread, or custom thread length. |
| Thread | Metric coarse thread; fine pitch or inch thread available upon request | Thread pitch must be stated clearly for non-standard or export stock items. |
| Material | Low carbon steel, medium carbon steel, selected carbon steel grades | Material should match forming, strength, coating, and application requirements. |
| Strength | Common carbon steel property classes; higher strength by order review | For heavy-load applications, confirm bolt grade, nut grade, washer size, and tightening method together. |
| Finish | Plain, zinc plated, yellow zinc, black oxide, hot dip galvanized | Finish should match service environment, appearance, and expected corrosion resistance. |
| Inspection | Head dimensions, square neck, thread gauges, finish appearance, coating thickness, packing checks | Inspection reports and third-party checks can be discussed before production. |
| Export packing | Bulk cartons, small boxes, bags, pallet packing, labels, barcodes, private packing | Packing can be arranged according to destination and order requirement. |
Material and Grade Explanation
Carbon steel carriage bolts are selected for cost-effective fastening in timber, metal brackets, construction hardware, equipment guards, and general industrial assemblies. Low carbon steel is common for standard carriage bolts because it forms well during heading. Medium carbon steel or higher property classes may be reviewed when higher strength is required.
Buyers should avoid treating all carbon steel bolts as the same grade. Material choice, heat treatment, forming process, thread rolling, and finish can affect the final performance. When comparing carriage bolts with Grade 8.8 carbon steel hex bolts, this guide on what 8.8 means on a bolt gives useful background for purchase decisions.
Carriage bolts should also be matched with suitable hex nuts and washers. For timber or slotted brackets, washer size and bearing surface can influence joint performance and field installation.
Inspection can include round head dimensions, square neck size, thread fit, coating condition, quantity, labels, and packing marks.
Surface Finish Selection Guide
The finish should be selected according to the working environment, visual requirement, installation method, and expected service life. Carbon steel carriage bolts are commonly exported with zinc plating for general use, hot dip galvanizing for outdoor construction, black oxide for indoor appearance, or plain oil for temporary storage protection.
| Finish | Typical Export Use | Buyer Note |
|---|---|---|
| Plain / oil | Indoor storage, temporary protection, later finishing | Not recommended for long outdoor exposure without additional protection. |
| Zinc plated | General hardware, light outdoor use, brackets, guards, furniture | Common choice for DIN 603 carbon steel carriage bolts. |
| Yellow zinc | Hardware stock, visible assemblies, timber brackets | Confirm appearance and corrosion requirement before ordering. |
| Black oxide | Indoor machinery, appearance-focused assemblies, light protection with oil | Black oxide is not the same as heavy outdoor corrosion protection. |
| Hot dip galvanized | Outdoor timber, construction, fencing, utility structures | Thread fit and matching nut compatibility should be checked due to thicker coating. |
For broader finish comparisons, review XZ Fastener’s fastener coating guide.
Manufacturing and Quality Control
Export production begins with review of the standard, diameter, length, head dimensions, square neck dimensions, thread pitch, carbon steel grade, finish, packing method, destination requirement, and inspection documents. Depending on size and quantity, carbon steel carriage bolts can be produced by cold heading, hot forging, thread rolling, machining, or combined processes.
Order confirmation
XZ Fastener checks the purchase description, drawing, material requirement, head shape, square neck, thread length, finish, labels, and inspection documents. Buyers can browse broader fastener products when the shipment also includes nuts, washers, anchors, screws, and hex bolts.
Production control
Common control points include head diameter, head height, square neck width, square neck height, shank length, thread gauge fit, burr control, coating appearance, and mixed-size prevention.
Custom export orders
For special neck dimensions, extra-long lengths, non-standard thread, special head profiles, or private packing, XZ Fastener can review custom fasteners from drawings, samples, photos, or buyer packing specifications.
Applications
Carbon steel carriage bolts are used when a smooth round head, anti-rotation square neck, and practical one-side tightening are useful. They are common in timber and metal assemblies where the bolt head remains visible or where the square neck helps hold the bolt in place.
- Wood-to-metal fastening
- Timber construction and brackets
- Fencing and outdoor hardware
- Truck body and trailer assemblies
- Machinery guards and frames
- Furniture and agricultural equipment
- Utility structures and support frames
- Distributor and maintenance replacement programs
For structural or safety-critical assemblies, confirm the bolt grade, nut grade, washer size, tightening method, and finish requirement before placing bulk export orders.
How to Get a Faster Quotation
A clear export inquiry helps XZ Fastener quote carbon steel carriage bolts accurately. Please provide:
- Size list, such as M6 x 30, M8 x 60, M10 x 100, M12 x 120.
- Standard or drawing, such as DIN 603, coach bolt type, or custom round head square neck design.
- Material and strength requirement, such as low carbon steel, medium carbon steel, or a specified property class.
- Thread requirement, including coarse thread, fine pitch, full thread, partial thread, or exact thread length.
- Finish requirement, such as plain, zinc plated, yellow zinc, black oxide, or hot dip galvanized.
- Quantity for each size and expected delivery schedule.
- Packaging requirement, including bulk carton, small box, bag, pallet, label, barcode, or private packing.
- Inspection requirements, such as dimensional report, coating thickness, material certificate, or third-party inspection.
- Destination port, delivery term, shipping marks, and any carton or pallet weight limits.
For a structured inquiry, use the request a quote page or contact XZ Fastener with drawings, photos, or a spreadsheet.
FAQ
What is a carbon steel carriage bolt?
It is a round head bolt with a square neck under the head. The square neck helps resist rotation during tightening, making it useful for timber, brackets, guards, and many wood-to-metal assemblies.
What standard is commonly used for metric carriage bolts?
DIN 603 is a common standard for metric mushroom head square neck bolts. Buyers should still confirm diameter, length, thread length, material, finish, and packing requirement in the purchase order.
Can carbon steel carriage bolts be hot dip galvanized?
Yes. Hot dip galvanized carriage bolts can be supplied for outdoor and timber construction applications. Because the coating is thicker than zinc plating, thread fit and matching nut requirements should be confirmed.
Can XZ Fastener export matching nuts and washers?
Yes. Matching hex nuts, flat washers, spring washers, and assembled packing can be supplied according to bolt size, finish, packing method, and order requirement.
Are carriage bolts the same as hex bolts?
No. Carriage bolts have a round head and square neck, while hex bolts have an external hex head. If a project also needs DIN 933 full thread hex bolts or metric hex head bolts, those should be listed as separate line items.
What documents can be requested before shipment?
Buyers may request dimensional inspection reports, coating thickness reports, material documents, packing lists, visual inspection records, and other documents according to order requirement.
Can custom carriage bolts be exported from drawings?
Custom head diameter, square neck size, thread length, special finish, marking, and packaging can be reviewed from drawings, samples, photos, quantity, and application details.
Send Your Carbon Steel Carriage Bolt Inquiry
Send your size list, finish, quantity, packaging method, and inspection requirements. Include the standard or drawing number, head and square neck requirements, thread length, matching nuts and washers, destination, shipping marks, and any carton or pallet requirements. XZ Fastener will review the details and prepare a quotation according to your order requirement.
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