Mushroom Head Square Neck Bolts
Standard: ASME B 18.5
Thread Type: UNC Thread / Full Thread
Commodity: Mushroom Head Square Neck Bolts
Also Named: Black Oxide Carriage Bolts
Material: Carbon Steel
Property Class: 4.6、4.8、8.8
Diameter: 10#、1/4、5/16、3/8、7/16、1/2
Finish: Plain, Black, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated
Alternative Standard: DIN 603、ANSI/ASME B 18.5.2.3M、JIS B 1171
MOQ: 1000kgs
Lead Time: 30 to 60 days
Product Introduction
AYA Fasteners (Hebei) Co., Ltd. is one of the most experienced manufacturers and suppliers of mushroom head square neck bolts in China. Please feel free to buy high quality mushroom head square neck bolts made in China here from our factory. For price consultation, contact us.

As a global supplier of customized fastening solutions, AYA's service process is also as close to customers as AYA's products. From describing needs to follow-up services, AYA will promptly and spare no effort to help customers solve any fastening problems that arise, to eliminate the concern of customers.
Product Description
Product Name | Mushroom Head Square Neck Bolts |
Also Named | Black Oxide Carriage Bolts |
Material | Carbon Steel |
Standard | ASME B 18.5 |
Property Class | 4.6、4.8、8.8 |
Diameter | 10#、1/4、5/16、3/8、7/16、1/2 |
Finish | Plain, Black, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated |
Thread Type | UNC Thread / Full Thread |
Dimensions Table

| Thread Size d d | 10# 0.1900 | 1/4 0.2500 | 5/16 0.3125 | 3/8 0.3750 | 7/16 0.4375 | 1/2 0.5000 | 5/8 0.6250 | 3/4 0.7500 | 7/8 0.8750 | 1 1.0000 | |
| PP | UNC | 24 | 20 | 18 | 16 | 14 | 13 | 11 | 10 | 9 | 8 |
| ds | max | 0.199 | 0.260 | 0.324 | 0.388 | 0.452 | 0.515 | 0.642 | 0.768 | 0.895 | 1.022 |
| min | 0.159 | 0.213 | 0.272 | 0.329 | 0.385 | 0.444 | 0.559 | 0.678 | 0.795 | 0.910 | |
| dk | max | 0.469 | 0.594 | 0.719 | 0.844 | 0.969 | 1.094 | 1.344 | 1.594 | 1.844 | 2.094 |
| min | 0.436 | 0.563 | 0.688 | 0.782 | 0.907 | 1.032 | 1.219 | 1.469 | 1.719 | 1.969 | |
| k | max | 0.114 | 0.145 | 0.176 | 0.208 | 0.239 | 0.270 | 0.344 | 0.406 | 0.459 | 0.531 |
| min | 0.094 | 0.125 | 0.156 | 0.188 | 0.219 | 0.250 | 0.313 | 0.375 | 0.438 | 0.500 | |
| s | max | 0.199 | 0.260 | 0.324 | 0.388 | 0.452 | 0.515 | 0.642 | 0.768 | 0.895 | 1.022 |
| min | 0.185 | 0.245 | 0.307 | 0.368 | 0.431 | 0.492 | 0.616 | 0.741 | 0.865 | 0.990 | |
| k1 | max | 0.125 | 0.156 | 0.187 | 0.219 | 0.250 | 0.281 | 0.344 | 0.406 | 0.469 | 0.531 |
| min | 0.094 | 0.125 | 0.156 | 0.188 | 0.219 | 0.250 | 0.313 | 0.375 | 0.438 | 0.500 | |
| r | 0.031 | 0.031 | 0.031 | 0.047 | 0.047 | 0.047 | 0.078 | 0.078 | 0.094 | 0.094 | |
| R | 0.031 | 0.031 | 0.031 | 0.031 | 0.031 | 0.031 | 0.062 | 0.062 | 0.062 | 0.062 | |
Product Details

Product Advantages

Advantages Of Mushroom Head Square Neck Bolts
1. The mushroom head square neck bolts have a larger bearing surface for better load capacity.
2. It has a better holding capacity for the attached items due to its "square neck" structure.
3. Various materials are available for these bolts to meet physical and chemical requirements.
4. It can be applied in extreme environments due to its high-quality materials and advanced surface treatment.
5. AYA has over 30 production lines for standard products and ten pieces of equipment for customized products to meet all your fasteners' requirements.
6. AYA provides free OEM & OEM services to help you build your brands.
Quality Inspection

Every link in the production will be supervised by quality control personnel to ensure that the final product meets customer expectations.
Sophisticated testing instruments and experienced quality control personnel can provide customers with more accurate quality inspection reports.
Packaging & Container Loading

AYA's product packaging can not only provide very good protection to the product, but also improve the beauty of the product.
AYA provides custom labeling services.
Usage Scenarios

Why Choose AYA?

AYA provides exclusive services to 1000+ members from all over the world every year, with a unique chain service solution system, you only need to click the mouse to get exclusive fastening solution and enjoy door-to-door services.
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