Black Allen Key Bolts
Standard: ASME B 18.3
Thread Type: Coarse Thread, Full Thread
Commodity: Black Allen Key Bolts
Also Named: Hex Socket Bolt
Material: Carbon Steel
Property Class: 4.6、4.8、5.6、5.8、6.8、8.8、9.8、10.9、12.9
Diameter: 0#、1#、2#、3#、4#、5#、6#、8#、10#、12#、1/4、5/16、3/8、7/16、1/2、9/16、5/8、3/4、7/8、1、1-1/8、1-1/4、1-3/8、1-1/2、1-3/4、2、2-1/4、2-1/2、2-3/4、3、3-1/4、3-1/2、3-3/4、4
Finish: Plain, Black, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated
Head Type: Cap Head
Drive Type: Internal Hex
Alternative Standard: ISO 4762、DIN 912、JIS B 1176
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 black allen key bolts in China. Please feel free to buy high quality black allen key bolts made in China here from our factory. For price consultation, contact us.

As a global supplier of customized fastening solutions, AYA's senvice 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 | Black Allen Key Bolts |
Also Named | Hex Socket Bolt |
Material | Carbon Steel |
Standard | ASME B 18.3 |
Property Class | 4.6、4.8、5.6、5.8、6.8、8.8、9.8、10.9、12.9 |
Diameter | 0#、1#、2#、3#、4#、5#、6#、8#、10#、12#、1/4、5/16、3/8、7/16、1/2、9/16、5/8、3/4、7/8、1、1-1/8、1-1/4、1-3/8、1-1/2、1-3/4、2、2-1/4、2-1/2、2-3/4、3、3-1/4、3-1/2、3-3/4、4 |
Finish | Plain, Black, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated |
Head Type | Cap Head |
Drive Type | Internal Hex |
Thread Type | Coarse Thread, Full Thread |
Dimensions Table

| Size | 0# | 1# | 2# | 3# | 4# | 5# | 6# | 8# | 10# | 12# | 1/4 | 5/16 | |
| d | Screw Diameter | 0.06 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.19 | 0.216 | 0.25 | 0.3125 |
| PP | UNC | - | 64 | 56 | 48 | 40 | 40 | 32 | 32 | 24 | 24 | 20 | 18 |
| UNF | 80 | 72 | 64 | 56 | 48 | 44 | 40 | 36 | 32 | 28 | 28 | 24 | |
| UNEF | - | - | - | - | - | - | - | - | - | 32 | 32 | 32 | |
| ds | max=nominal size | 0.06 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.19 | 0.216 | 0.25 | 0.3125 |
| min | 0.0568 | 0.0695 | 0.0822 | 0.0949 | 0.1075 | 0.1202 | 0.1329 | 0.1585 | 0.184 | 0.2095 | 0.2435 | 0.3053 | |
| dk | max | 0.096 | 0.118 | 0.14 | 0.161 | 0.183 | 0.205 | 0.226 | 0.27 | 0.312 | 0.324 | 0.375 | 0.469 |
| min | 0.091 | 0.112 | 0.134 | 0.154 | 0.176 | 0.198 | 0.216 | 0.257 | 0.298 | 0.314 | 0.354 | 0.446 | |
| k | max | 0.06 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.19 | 0.216 | 0.25 | 0.312 |
| min | 0.057 | 0.07 | 0.083 | 0.095 | 0.108 | 0.121 | 0.134 | 0.159 | 0.185 | 0.21 | 0.244 | 0.306 | |
| s | Nominal Size | 0.05 | 0.062 | 0.078 | 0.078 | 0.094 | 0.094 | 0.109 | 0.141 | 0.156 | 0.156 | 0.188 | 0.25 |
| t | min | 0.025 | 0.031 | 0.038 | 0.044 | 0.051 | 0.057 | 0.064 | 0.077 | 0.09 | 0.103 | 0.12 | 0.151 |
| b | min | 0.5 | 0.62 | 0.62 | 0.62 | 0.75 | 0.75 | 0.75 | 0.88 | 0.88 | 0.88 | 1 | 1.12 |
| c | chamfer or radius | 0.004 | 0.005 | 0.008 | 0.008 | 0.009 | 0.012 | 0.013 | 0.014 | 0.018 | 0.022 | 0.025 | 0.033 |
| r | chamfer or radius | 0.007 | 0.007 | 0.007 | 0.007 | 0.008 | 0.008 | 0.008 | 0.008 | 0.008 | 0.010 | 0.010 | 0.010 |
| w | min | 0.020 | 0.025 | 0.029 | 0.034 | 0.038 | 0.043 | 0.047 | 0.056 | 0.065 | 0.082 | 0.095 | 0.119 |
| Size | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 | 7/8 | 1 | 1-1/8 | 1-1/4 | 1-3/8 | 1-1/2 | |
| d | Screw Diameter | 0.375 | 0.4375 | 0.5 | 0.5625 | 0.625 | 0.75 | 0.875 | 1 | 1.125 | 1.25 | 1.375 | 1.5 |
| PP | UNC | 16 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 6 |
| UNF | 24 | 20 | 20 | 18 | 18 | 16 | 14 | 12 | 12 | 12 | 12 | 12 | |
| UNEF | 32 | 28 | 28 | 24 | 24 | 20 | 20 | 20 | 18 | 18 | 18 | 18 | |
| ds | max=nominal size | 0.375 | 0.4375 | 0.5 | 0.5625 | 0.625 | 0.75 | 0.875 | 1 | 1.125 | 1.25 | 1.375 | 1.5 |
| min | 0.3678 | 0.4294 | 0.4919 | 0.5538 | 0.6163 | 0.7406 | 0.8647 | 0.9886 | 1.1086 | 1.2336 | 1.3568 | 1.4818 | |
| dk | max | 0.562 | 0.656 | 0.75 | 0.843 | 0.938 | 1.125 | 1.312 | 1.5 | 1.688 | 1.875 | 2.062 | 2.25 |
| min | 0.54 | 0.631 | 0.725 | 0.827 | 0.914 | 1.094 | 1.291 | 1.476 | 1.665 | 1.852 | 2.038 | 2.224 | |
| k | max | 0.375 | 0.438 | 0.5 | 0.562 | 0.625 | 0.75 | 0.875 | 1 | 1.125 | 1.25 | 1.375 | 1.5 |
| min | 0.368 | 0.43 | 0.492 | 0.554 | 0.616 | 0.74 | 0.864 | 0.988 | 1.111 | 1.236 | 1.36 | 1.485 | |
| s | Nominal Size | 0.312 | 0.375 | 0.375 | 0.437 | 0.5 | 0.625 | 0.75 | 0.75 | 0.875 | 0.875 | 1 | 1 |
| t | min | 0.182 | 0.213 | 0.245 | 0.276 | 0.307 | 0.37 | 0.432 | 0.495 | 0.557 | 0.62 | 0.682 | 0.745 |
| b | min | 1.25 | 1.38 | 1.5 | 1.5 | 1.75 | 2 | 2.25 | 2.5 | 2.81 | 3.12 | 3.44 | 3.75 |
| c | chamfer or radius | 0.040 | 0.047 | 0.055 | 0.062 | 0.070 | 0.085 | 0.100 | 0.114 | 0.129 | 0.144 | 0.160 | 0.176 |
| r | chamfer or radius | 0.010 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| w | min | 0.143 | 0.166 | 0.190 | 0.214 | 0.238 | 0.285 | 0.333 | 0.380 | 0.428 | 0.475 | 0.523 | 0.570 |
| Size | 1-3/4 | 2 | 2-1/4 | 2-1/2 | 2-3/4 | 3 | 3-1/4 | 3-1/2 | 3-3/4 | 4 | |
| d | Screw Diameter | 1.75 | 2 | 2.25 | 2.5 | 2.75 | 3 | 3.25 | 3.5 | 3.75 | 4 |
| PP | UNC | 5 | 4.5 | 4.5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| UNF | - | - | - | - | - | - | - | - | - | - | |
| UNEF | - | - | - | - | - | - | - | - | - | - | |
| ds | max=nominal size | 1.75 | 2 | 2.25 | 2.5 | 2.75 | 3 | 3.25 | 3.5 | 3.75 | 4 |
| min | 1.7295 | 1.978 | 2.228 | 2.4762 | 2.7262 | 2.9762 | 3.2262 | 3.4762 | 3.7262 | 3.9762 | |
| dk | max | 2.625 | 3 | 3.375 | 3.75 | 4.125 | 4.5 | 4.875 | 5.25 | 5.625 | 6 |
| min | 2.597 | 2.97 | 3.344 | 3.717 | 4.09 | 4.464 | 4.837 | 5.211 | 5.584 | 5.958 | |
| k | max | 1.75 | 2 | 2.25 | 2.5 | 2.75 | 3 | 3.25 | 3.5 | 3.75 | 4 |
| min | 1.734 | 1.983 | 2.232 | 2.481 | 2.73 | 2.979 | 3.228 | 3.478 | 3.727 | 3.976 | |
| s | Nominal Size | 1.25 | 1.5 | 1.75 | 1.75 | 2 | 2.25 | 2.25 | 2.75 | 2.75 | 3 |
| t | min | 0.87 | 0.995 | 1.12 | 1.245 | 1.37 | 1.495 | 1.62 | 1.745 | 1.87 | 1.995 |
| b | min | 4.38 | 5 | 5.62 | 6.25 | 6.88 | 7.5 | 8.12 | 8.75 | 9.38 | 10 |
| c | chamfer or radius | 0.207 | 0.238 | 0.269 | 0.300 | 0.332 | 0.363 | 0.394 | 0.426 | 0.458 | 0.489 |
| r | chamfer or radius | 0.020 | 0.020 | 0.036 | 0.036 | 0.036 | 0.036 | 0.036 | 0.036 | 0.036 | 0.036 |
| w | min | 0.665 | 0.760 | 0.855 | 0.950 | 1.045 | 1.140 | 1.235 | 1.330 | 1.425 | 1.520 |
Product Details

Product Advantages

Advantages
1. The black oxide Allen key bolts can protect against unintentional stripping of fasteners.
2. It has a pretty economical cost rate compared with the other types due to its low-cost surface treatment.
3. The black oxide provides a new appearance choice for the machines or other equipment.
4. It's made from high-quality steel materials, bringing a long service life and low maintenance cost.
5. AYA invested in the R&D of the new product for an annual income of about 10%.
6. AYA has built a complete logistic system to deliver the products globally.
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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