Round Head Square Neck Bolt / Carriage Bolt
A carriage bolt (also called coach bolt and round-head square-neck bolt) is a type of bolt. It is also known as a cup head bolt in Australia and New Zealand.
It is distinguished from other bolts by its shallow mushroom head and the fact that the cross-section of the shank, though circular for most of its length (as in other kinds of bolt), is square immediately beneath the head.[2] This makes the bolt self-locking when it is placed through a square hole in a metal strap. This allows the fastener to be installed with only one wrench, working from the opposite end. The head of a carriage bolt is usually a shallow dome. The shank has no threads and its diameter equals the size of the square cross-section.
The carriage bolt was devised for use through an iron strengthening plate on either side of a wooden beam, the squared part of the bolt fitting into a square hole in the ironwork. It is common to use a carriage bolt on bare timber, the square section giving enough grip to prevent rotation.
| Standard | ANSI/ASME B18.5/DIN603 |
| Strength Grade | Gr 2, 5, 8; Gr 4.8, 8.8, 10.9 |
| Material | Q195/35K/10B21/40CR/Stainless Steel 304 |
| Size | Dia 1/4''-1'', M5-M20, or customized |
| Exterior Finish | Plain/Zinc/Black/Decromet |
| Package | Bulk in carton, small box, or customized |
ASME B18.5
| Nominal Size or Basic Diameter | E | A | H | J | T | U | |||||||
| Body Diameter | Head Diameter | Head Height | Slot Width | Slot Depth | Fillet Radius | ||||||||
| Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | ||
| 1/4'' | 0.2500 | 0.2500 | 0.2450 | 0.4370 | 0.4180 | 0.1910 | 0.1750 | 0.0750 | 0.0640 | 0.1170 | 0.0970 | 0.0310 | 0.0160 |
| 5/16'' | 0.3125 | 0.3125 | 0.3070 | 0.5620 | 0.5400 | 0.2450 | 0.2260 | 0.0840 | 0.0720 | 0.1510 | 0.1260 | 0.0310 | 0.0160 |
| 3/8'' | 0.3750 | 0.3750 | 0.3690 | 0.6250 | 0.6030 | 0.2730 | 0.2520 | 0.0940 | 0.0810 | 0.1680 | 0.1380 | 0.0310 | 0.0160 |
| 7/16'' | 0.4375 | 0.4375 | 0.4310 | 0.7500 | 0.7250 | 0.3280 | 0.3020 | 0.0940 | 0.0810 | 0.2020 | 0.1670 | 0.0470 | 0.0160 |
| 1/2'' | 0.5000 | 0.5000 | 0.4930 | 0.8120 | 0.7860 | 0.3540 | 0.3270 | 0.1060 | 0.0910 | 0.2180 | 0.1780 | 0.0470 | 0.0160 |
| 9/16'' | 0.5625 | 0.5625 | 0.5550 | 0.9370 | 0.9090 | 0.4090 | 0.3780 | 0.1180 | 0.1020 | 0.2520 | 0.2070 | 0.0470 | 0.0160 |
| 5/8'' | 0.6250 | 0.6250 | 0.6170 | 1.0000 | 0.9700 | 0.4370 | 0.4050 | 0.1330 | 0.1160 | 0.2700 | 0.2200 | 0.0620 | 0.0310 |
| 3/4'' | 0.7500 | 0.7500 | 0.7420 | 1.2500 | 1.2150 | 0.5460 | 0.5070 | 0.1490 | 0.1310 | 0.3380 | 0.2780 | 0.0620 | 0.0310 |
FOR MORE PRODUCTS, PLEASE CLICK
BOLTS | SCREWS | NUTS | WASHERS |
CARRIAGE BOLT | SHOULDER BOLT | HEX HEAD BOLT | FLANGE BOLT |
Hangzhou Jiangxin Industry Co., Ltd
Established in 2004, Hangzhou Jiangxin Industry Co., Ltd is a national high-tech enterprise and a scientific and technological enterprise in Zhejiang Province. We are a professional fastener manufacturer that integrates production, research and development, and sales. With our world-class fastener production equipment and advanced ERP system for management, we ensure top-notch quality and efficiency.Our company holds the ISO9001 international quality management system certification and operates distribution outlets and logistics distribution centers in East China. We specialize in producing and supplying a wide range of standard and non-standard high-strength bolts and advanced expansion bolts. Our materials include various carbon steel and stainless steel 304 and 316, making our products suitable for high-speed rail, automobiles, ships, machinery, molds, electronics, and construction industries.
Our products are known for their exceptional performance, fast installation, beautiful appearance, compatibility, and stability. These advantages have made them highly favored by both Chinese and foreign merchants.
Business Varieties
- Bolts: outer hexagonal bolts, inner hexagonal bolts, carriage bolts, flange bolts, etc.
- Screws: machine screws, drilling screws, set screws, 12.9-grade plug screws, hexagonal wood screws, self-tapping screws
- Nuts: hexagonal nuts, K caps, nylon, stamped metal self-locking nuts, hexagonal flange nuts, cap nuts, rivet nut series, etc.
- Others: semi-hollow rivets, step rivets, and various non-standard tightening customization of firmware
Contact Us to Get A Quote
