carbon steel carriage bolts factory
XZ Fastener manufactures carbon steel carriage bolts for industrial buyers who need round head square neck bolts with stable dimensions, clean threads, and practical surface finishes. These bolts are commonly ordered as DIN 603 carriage bolts, coach bolts, mushroom head square neck bolts, or drawing-based anti-rotation bolts according to order requirement. Carbon steel carriage bolts can be supplied in common metric sizes, with zinc plating, hot dip galvanizing, black oxide, plain oil, or other finishes available upon request. Buyers can source DIN 603 carbon steel carriage bolts with packing, labeling, and inspection details confirmed before production.
Стандарт
DIN 603, coach bolt types, drawing-based parts
Strength
Common carbon steel grades; higher grades by order review
Материал
Carbon steel, low carbon steel, medium carbon steel
Finish
Zinc plated, hot dip galvanized, black oxide, plain oil
Приложение
Wood-to-metal, timber, construction, fencing, machinery
What Buyers Should Know Before Sourcing Carbon Steel Carriage Bolts
Carriage bolts are different from standard hex bolts because the round head provides a smooth exposed surface and the square neck helps resist rotation during tightening. Before sourcing, buyers should confirm whether the assembly needs DIN 603 dimensions, inch coach bolt dimensions, a special square neck, a full thread, a partial thread, or a drawing-based design.
Confirm head and neck dimensions
The round head diameter, head height, square neck width, square neck height, and thread length should match the hole, timber thickness, metal bracket, or fixture. Related carriage bolt products can be reviewed when buyers need standard and custom options.
Match grade to the application
Low carbon steel is common for general fastening, while medium carbon steel or higher property classes may be required for heavier mechanical loads. If the order also includes DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, or metric hex head bolts, list those items separately from carriage bolts.
Choose finish by service environment
Zinc plating is common for indoor and light outdoor use. Hot dip galvanizing is often selected for outdoor construction and timber structures. Black oxide is mainly used for indoor appearance and light protection unless additional oiling or coating is specified.
Common Purchasing Descriptions
Clear purchasing descriptions help avoid wrong head shape, wrong neck dimension, or unsuitable finish. Common buyer wording includes:
- DIN 603 carbon steel carriage bolts, M8 x 60, zinc plated, round head square neck.
- Carbon steel coach bolts M10 x 100, hot dip galvanized, with matching hex nuts and flat washers.
- Round head square neck bolts, low carbon steel, black oxide finish, bulk carton packing.
- Mushroom head carriage bolts with square neck, carbon steel, full thread or partial thread according to drawing.
- Zinc plated carbon steel carriage bolts for timber brackets, fencing hardware, and equipment guards.
- Separate fastener lines such as zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts when the same purchase order includes external hex bolts.
If the order includes carriage bolts, hex nuts, washers, and hex bolts together, separate each item by standard, size, grade, finish, packing quantity, and inspection requirement.
Detailed Specifications Table
| Предмет | Спецификация | Buyer 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 supply range depends on length, grade, and production method. |
| Length | Standard lengths or custom lengths according to drawings | Confirm whether thread length is standard, full thread, or custom. |
| Thread | Metric coarse thread; fine pitch or inch thread available upon request | Thread pitch must be stated clearly for non-standard items. |
| Материал | Low carbon steel, medium carbon steel, selected carbon steel grades | Material should match strength, forming, and finish requirements. |
| Strength | Common carbon steel property classes; higher strength by order review | For high-load applications, confirm bolt grade, nut grade, and washer requirement together. |
| Finish | Plain, zinc plated, yellow zinc, black oxide, hot dip galvanized | Finish should match the installation environment and expected service life. |
| Inspection | Head dimensions, square neck, thread gauges, finish appearance, coating thickness, packing checks | Special inspection reports can be discussed before production. |
| Packing | Bulk cartons, small boxes, bags, pallet packing, labels, barcodes, private packing | Can be supplied according to order requirement. |
Material and Grade Explanation
Carbon steel carriage bolts are usually selected for cost-effective mechanical fastening in timber, metal brackets, equipment guards, and general construction. Low carbon steel is easier to form and is common for standard carriage bolts. Medium carbon steel or higher property classes may be reviewed when higher tensile strength is needed.
Buyers should avoid assuming all carbon steel fasteners have the same strength. Material, heat treatment, thread rolling, and finish can affect final performance. For broader grade selection, review this guide on what 8.8 means on a bolt when comparing carriage bolts with Grade 8.8 carbon steel hex bolts.
Carriage bolts should also be matched with suitable hex nuts and washers. If the joint uses timber or slotted brackets, washer size and bearing surface can be as important as bolt diameter.
Inspection can include round head dimensions, square neck size, thread fit, surface finish, coating thickness, quantity, and packing marks.
Surface Finish Selection Guide
The surface finish should be selected according to the working environment, appearance requirement, installation method, and expected service life. Carbon steel carriage bolts are commonly supplied with zinc plating for general use, hot dip galvanizing for outdoor construction, black oxide for indoor appearance, or plain oil for short-term storage protection.
| Finish | Typical Use | Buyer Note |
|---|---|---|
| Plain / oil | Indoor storage, temporary protection, machining or later finishing | Not recommended for long outdoor exposure without additional protection. |
| Zinc plated | General hardware, light outdoor use, furniture, brackets, equipment guards | Common choice for DIN 603 carbon steel carriage bolts. |
| Yellow zinc | Hardware stock, timber brackets, visible assemblies | Confirm appearance and corrosion requirement before ordering. |
| Чернение | 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 nut compatibility should be checked due to thicker coating. |
For broader coating comparisons, review XZ Fastener’s fastener coating guide.
Manufacturing and Quality Control
Factory production begins with review of the standard, diameter, length, head dimensions, square neck dimensions, thread pitch, carbon steel grade, finish, packing method, and inspection requirement. Depending on size and quantity, carbon steel carriage bolts can be produced by cold heading, hot forging, thread rolling, machining, or combined processes.
Before production
XZ Fastener checks the purchase description, drawing, material requirement, head shape, square neck, thread length, finish, and inspection documents. Buyers can browse broader fastener products when the order also includes nuts, washers, anchors, screws, and hex bolts.
During production
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 carriage bolts
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.
Приложения
Carbon steel carriage bolts are used when a smooth round head, anti-rotation square neck, and practical installation are needed. They are common in timber and metal assemblies where the bolt head remains visible or where one-side tightening is helpful.
- 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
- Maintenance replacement bolt programs
For structural or safety-critical assemblies, confirm the bolt grade, nut grade, washer size, tightening method, and finish requirement before placing bulk orders.
How to Get a Faster Quotation
A clear 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.
For a structured inquiry, use the request a quote page or contact XZ Fastener with drawings, photos, or a spreadsheet.
Часто задаваемые вопросы
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 is the common standard 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 supply matching nuts and washers?
Yes. Matching hex nuts, flat washers, spring washers, and assembled packing can be supplied according to bolt size, finish, 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 produced 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, 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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