carbon steel carriage bolts wholesale supplier
XZ Fastener supplies carbon steel carriage bolts for wholesale buyers, hardware distributors, construction suppliers, timber product manufacturers, and project contractors that need round head square neck bolts in repeatable batches. 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 carriage bolts are available with zinc plating, hot dip galvanizing, black oxide, yellow zinc, or plain oil finish. Buyers can source DIN 603 carbon steel carriage bolts with matching nuts, washers, carton labels, pallet packing, and inspection details confirmed before shipment.
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, yellow zinc, 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
Wholesale sourcing should focus on stable dimensions, repeatable finish, clear carton labels, consistent packing quantity, and correct item separation. Carriage bolts have a smooth round head and square neck under the head, so buyers should confirm the head diameter, square neck size, thread length, bolt length, material grade, finish, and packing method before ordering.
Confirm standard and stock range
DIN 603 is commonly used for metric carriage bolts, while inch coach bolts and drawing-based parts may have different head and square neck dimensions. Buyers can review related carriage bolt products when preparing a wholesale stock list.
Separate product families clearly
Carriage bolts are not the same as DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, or metric hex head bolts. If a wholesale order also includes zinc plated DIN 933 bolts, black oxide DIN 933 bolts, or hot dip galvanized DIN 933 bolts, each item should have its own line.
Plan packaging for resale
Wholesale buyers may need bulk cartons, small boxes, bags, barcode labels, private labels, pallet packing, or mixed-size separation. Confirming these details early helps reduce warehouse rework after delivery.
Common Purchasing Descriptions
Clear purchasing descriptions help avoid wrong head shape, unsuitable finish, or missing packing details. Typical wholesale wording includes:
- DIN 603 carbon steel carriage bolts, M6-M12 mixed sizes, zinc plated, bulk carton packing.
- Carbon steel coach bolts M8 x 80 and M10 x 100, hot dip galvanized, with matching nuts and flat washers.
- Mushroom head square neck bolts, low carbon steel, black oxide finish, small box packing.
- Round head square neck bolts according to drawing, carbon steel, controlled square neck and thread length.
- Zinc plated carbon steel carriage bolts for timber brackets, fencing hardware, and construction hardware stock.
- Mixed wholesale program with carbon steel carriage bolts, flat washers, hex nuts, and DIN 933 full thread hex bolts packed by size and item code.
If the order includes carriage bolts, hex nuts, washers, and other bolt types, separate every item by standard, size, grade, finish, packing unit, label requirement, and inspection requirement.
Detailed Specifications Table
| Item | Specification | Wholesale 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 | Wholesale programs often focus on high-moving sizes such as M6-M12. |
| 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 heavier loads, confirm bolt grade, nut grade, washer size, and tightening method together. |
| Finish | Plain, zinc plated, yellow zinc, black oxide, hot dip galvanized | Use consistent finish names on labels, invoices, and packing lists. |
| Inspection | Head dimensions, square neck, thread gauges, finish appearance, coating thickness, packing checks | Inspection reports and third-party checks can be discussed before production. |
| Wholesale 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.
Wholesale buyers should avoid treating all carbon steel fasteners as the same grade. Material choice, heat treatment, forming process, thread rolling, and finish can affect 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, carton marks, and pallet packing checks.
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 supplied with zinc plating for general stock, hot dip galvanizing for outdoor construction, black oxide for indoor appearance, or plain oil for temporary storage protection.
| Finish | Typical Wholesale 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
Wholesale production begins with review of the standard, diameter, length, head dimensions, square neck dimensions, thread pitch, carbon steel grade, finish, packing method, label format, 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 wholesale program 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 wholesale programs
For special neck dimensions, extra-long lengths, non-standard thread, special head profiles, private labels, or mixed fastener kits, XZ Fastener can review custom fasteners from drawings, samples, photos, or buyer packing specifications.
Applications
Carbon steel carriage bolts are practical wholesale items for distributors serving timber, construction, fencing, hardware, equipment repair, and general fabrication markets. The smooth head and square neck make them useful when a clean exposed head and anti-rotation support are required.
- 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 wholesale orders.
How to Get a Faster Quotation
A clear wholesale 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 reorder frequency.
- 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, delivery term, carton weight limit, pallet requirement, and shipping marks.
For a structured inquiry, use the request a quote page or contact XZ Fastener with drawings, photos, or a spreadsheet.
FAQ
Are carbon steel carriage bolts suitable for wholesale stock?
Yes. Carbon steel carriage bolts are common stock items for hardware distributors, construction suppliers, timber hardware sellers, and maintenance markets. The size and finish range should match local demand and reorder patterns.
What is the common metric standard for 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 carriage bolts be supplied with 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.
Which finish is best for outdoor wholesale programs?
Hot dip galvanized finish is often selected for outdoor timber, fencing, utility structures, and construction hardware. Zinc plating is common for general hardware and light outdoor use.
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.
Can private label packing be supplied?
Private labels, barcode labels, small boxes, bag packing, pallet marks, and buyer-specified carton formats can be discussed according to order requirement.
Can custom carriage bolts be supplied for wholesale orders?
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 Wholesale 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, carton label needs, pallet requirements, destination, and shipping marks. XZ Fastener will review the details and prepare a quotation according to your order requirement.
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