Non fracturing Cross Recessed Hexagon Bolts with Indentation from China Xiaoguo®- manufactured from carbon steel or stainless steel.The performance grades are divided into 4.8 grade for ordinary and 8.8 grade for high strength. The surface treatments available include electro-galvanizing, hot-galvanizing, Dacromet coating or blackening.Stainless steel 304 and 316 have high tensile strength and do not require coating. They can resist rust by relying on the material itself.
We can provide non-standard customized services for Non fracturing Cross Recessed Hexagon Bolts with Indentation according to customer requirements. The customized content includes: thread diameter, length), cross-slot type, hexagon head edge dimension, thread form, etc. The customization service is based on the drawings provided by the customer. The products come with full-size inspection reports, hardness and torque test reports.
Why is the head of the Non fracturing Cross Recessed Hexagon Bolts with Indentation shaped like this?In fact, these designs are aimed at addressing the problems encountered in actual usage.
1.Hexagonal head
When dealing with rusted parts or situations where a firm lock is required, the cross-slot screwdriver is prone to slip when it reaches a certain degree of rotation.However, the hexagonal head is different. With a socket wrench, you can apply force to turn it, and there's no need to worry about slipping.So the usage of the Non fracturing Cross Recessed Hexagon Bolts with Indentation is usually as follows: First, use a Phillips screwdriver, and finally use a hex wrench to apply force and lock the screws in place.
2.Cross slot
The cross-slot screwdriver is easy to use and can also be used with an electric drill. In areas with poor visibility or where your hand cannot reach, the cross-slot is easier to operate than the hexagonal head.
3.Center indentation
The function of the concave groove is to transform the sharp corners at the bottom of the cross slot into smooth pits. The stress is thus dispersed, and the head is less likely to crack. Moreover, the tip of the screwdriver precisely fits into that pit, making it difficult for it to come out.
4.Hardened thread
The threads of the Non fracturing Cross Recessed Hexagon Bolts with Indentation have been specially hardened, making them harder than ordinary screws.All you need to do is drill a hole slightly smaller than the screw on the thin sheet metal, then screw it in. It will automatically cut the internal thread, without the need for pre-tapping. This saves time and effort.
| Mon | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST6.3 | ST8 |
| P | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 2.1 |
| a max | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 2.1 |
| da max | 3.5 | 4.1 | 4.9 | 5.5 | 7.1 | 9.2 |
| s max | 5 | 5.5 | 7 | 8 | 10 | 13 |
| s min | 4.82 | 5.32 | 6.78 | 7.78 | 9.78 | 12.73 |
| e min | 5.4 | 5.96 | 7.59 | 8.71 | 10.95 | 14.26 |
| k max | 2.3 | 2.6 | 3 | 3.8 | 4.7 | 6 |
| k min | 2 | 2.3 | 2.6 | 3.3 | 4.1 | 5.2 |
| r min | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 |
| No. | 1 | 2 | 2 | 2 | 3 | 3 |
| M | 2.5 | 3.5 | 4 | 4.4 | 6.2 | 7.2 |
| t min | 0.95 | 0.91 | 1.4 | 1.8 | 2.36 | 3.2 |
| t max | 1.32 | 1.43 | 1.9 | 2.33 | 2.86 | 3.86 |
| d max | 2.9 | 3.53 | 4.22 | 4.8 | 6.25 | 8 |
| d min | 2.76 | 3.35 | 4.04 | 4.62 | 6.03 | 7.78 |
| d1 max | 2.18 | 2.64 | 3.1 | 3.58 | 4.88 | 6.2 |
| d1 min | 2.08 | 2.51 | 2.95 | 3.43 | 4.7 | 5.99 |