Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of carbon steel blue-white zinc plated carriage bolts din 603 square neck coach bolts in China. Welcome to buy bulk high quality carbon steel blue-white zinc plated carriage bolts din 603 square neck coach bolts made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
A good carriage bolt does two things: it holds tight, and it looks clean. Ours do both.
The rounded head sits flush against the surface - no snagging, no rough edges. Underneath, the square neck bites into the material during tightening, so the bolt doesn't spin. One wrench, one person, done. No helper needed.
We use carbon steel with a blue-white zinc finish. It's not stainless steel, but for most indoor and outdoor applications, it doesn't need to be. The coating holds up well against rust - 72 to 120 hours in salt spray tests - and costs about 60% less. That's a trade-off most of our customers are happy to make.
Choose Grade 4.8 for general use, or Grade 8.8 when you need extra strength. Both meet DIN 603 and ASME B18.5, so they'll match standard hardware anywhere.
Specifications
|
Item |
Carriage bolt |
|
Standard |
DIN603 |
|
Material |
Carbon steel |
|
Grade/Class |
4.8 (For general strength fastening, it can be used in conjunction with 4.8 grade Nuts.) |
|
Finish/Surface treatment |
Blue white zinc |
|
Size |
M4-M8,M10, M12, M14, M16, M18, M20.... |
|
Thread |
UNC/UNF |
|
Thread pitch |
0.8mm/1.5mm/2mm |
|
Measuring |
Inch/Metric |
|
Trade terms |
EXW/FCA/FOB/CIF/DAP/DDP |
|
Packaging style |
Small boxes+cartons+pallets Small bags+cartons+pallets Bulk +cartons+pallets Bulk +bags+pallets |
|
Customized |
Fasteners, Logo, Head mark, and packaging |
|
Logistic |
By air/By sea/By truck |
|
After-sales service |
24hours |
|
Payment terms |
30% T/T as deposit,70%balance before delivery |
|
Payment methods |
Bank account/Ali pay Qr code/Wechat Qr code/Western Union.... |
|
Original |
Handan city Hebei province China |
Key Features & Advantages
Cost-Effective Solution: Carbon steel with blue-white zinc plating provides excellent corrosion protection at approximately 60% lower cost than stainless steel alternatives - ideal for projects where budget matters without compromising on quality.
Anti-Rotation Square Neck: The square neck beneath the round head bites securely into wood or pre-punched metal slots, eliminating the need for a second wrench during installation. This enables one-person, one-tool assembly, saving significant labor time and cost.
Enhanced Corrosion Resistance: The blue-white zinc plating offers superior rust protection compared to standard bright zinc or yellow zinc finishes. With salt spray test resistance of 72-120 hours, it provides reliable protection for indoor, outdoor, and mildly corrosive environments.
Clean, Professional Appearance: The smooth round head delivers a flush, finished look that's ideal for visible applications. The bright blue-white finish adds a clean, high-quality aesthetic appeal.
High Strength Options: Available in Grade 8.8 for heavy-duty applications requiring high tensile strength, or Grade 4.8 for general-purpose fastening. Both options provide reliable mechanical performance.
Versatile Compatibility: Manufactured to DIN 603 and ASME B18.5 standards, ensuring global interchangeability and easy sourcing for international projects.
From our factory in Handan, China - direct supply, competitive pricing, and fast turnaround on bulk orders. Custom head markings, logo, and packaging options available. Distributors and dealers welcome.
FAQ
Q: What is the difference between blue-white zinc and standard galvanized coating?
A: Blue-white zinc (also called trivalent chromium zinc) provides 2-3 times better corrosion resistance than standard galvanized coatings, with a brighter, cleaner aesthetic finish and environmentally friendly trivalent chromium passivation.
Q: Can I get Grade 8.8 carriage bolts in blue-white zinc?
A: Yes, we offer both Grade 4.8 and Grade 8.8 options. Grade 8.8 is recommended for heavy-duty structural applications requiring higher tensile strength.
Q: What sizes do you offer?
A: We offer metric sizes from M5 to M20 and inch sizes from 1/4" to 3/4", with lengths ranging from 20mm to 200mm. Custom sizes are also available.
Q: re these bolts suitable for outdoor use?
A: Yes, the blue-white zinc plating provides reliable corrosion resistance for most outdoor applications. For coastal or marine environments, we recommend upgrading to 316 stainless steel carriage bolts.
Q: Do you provide samples?
A: Yes, samples are available upon request. We can ship samples within 3-5 days for your quality testing.
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