PROFESSIONAL MANUFACTURER OF HARDWARE PRODUCTS
Jinan Meierde Industry Co., Ltd
Carbon Steel Carriage Bolt – Cup Head Square Neck Bolt
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Product introduction
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| ①,dsmin ≈ 螺纹直径 ②,公称长度L≤75mm和规格d≤M12的螺栓，允许制出全螺纹。 |
Product Overview
Our Cup Head Square Neck Bolt is also known as a carriage bolt, round head square neck bolt, or mushroom head square neck bolt. It is manufactured from premium carbon steel and designed for wood-to-wood and wood-to-metal connections where a flush, low-profile finish and reliable anti-rotation performance are required.
The bolt is inserted through a pre-drilled hole. When the nut is tightened, the square neck bites into the wood, preventing the bolt from spinning. This allows installation with only one wrench on the nut side.
Key Features
Cup / Dome Head: Smooth rounded head for a neat, finished look with low protrusion.
Square Neck: Locks into timber to stop rotation during tightening.
Carbon Steel Construction: High tensile strength and durability for heavy-duty use.
Anti-Rotation Design: No need to hold the head with a wrench.
Tamper-Resistant: Smooth head makes removal from the head side difficult.
Multiple Finishes: Zinc plated, hot-dip galvanized, black oxide, Dacromet, etc.
Metric & Inch Sizes: Available in a wide range of diameters and lengths.
Customizable: Partial thread, full thread, special lengths, and custom markings available.
Technical Specifications
| Item | Details |
|---|---|
| Product Name | Carbon Steel Carriage Bolt / Cup Head Square Neck Bolt |
| Material | Carbon Steel (Q235, 35K, 45#, 10B21, etc.) |
| Standard | DIN 603, ISO 8677, ASME B18.5, or custom |
| Grade | 4.8, 8.8, 10.9 / Grade 2, 5, 8 |
| Head Type | Cup Head / Dome Head / Round Head |
| Neck Type | Square Neck |
| Thread Type | Metric Coarse, UNC, UNF |
| Thread Style | Partially Threaded (standard); Fully Threaded optional |
| Diameter | M5 – M24 / 1/4" – 1" |
| Length | 20 mm – 300 mm / 1" – 12" |
| Finish | Plain, Zinc Plated, Hot-Dip Galvanized, Black Oxide, Nickel Plated, Dacromet |
| Packing | Bulk Carton, Small Box, Poly Bag, Pallet, Custom |
| MOQ | [e.g., 1,000 pcs] |
| Lead Time | [e.g., 15–30 days] |
| Payment | T/T, L/C, Western Union, etc. |
Available Sizes – Examples
| Thread Size | Common Lengths | Typical Applications |
|---|---|---|
| M6 | 30–100 mm | Furniture, light decking |
| M8 | 40–150 mm | Fencing, railings, decking |
| M10 | 50–200 mm | Timber framing, playgrounds |
| M12 | 60–250 mm | Heavy decking, structures |
| M16 | 80–300 mm | Construction, agriculture |
| 1/4" – 3/4" | 1" – 12" | Inch-series projects |
Custom sizes are available upon request. Exact dimensions can be supplied according to DIN 603, ISO 8677, or customer drawings.
Applications
Decking and boardwalks
Fencing and gates
Timber framing and pergolas
Railings and handrails
Playground equipment
Agricultural machinery
Truck beds and trailers
Furniture and woodworking
General construction and repair
Product message
Jinan Western Industrial park, Jinan City, Shandong Province
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