What are the specifications of hexagonal screws and Phillips screws

Hexagonal screw specifications

Thread specification: Hexagonal screws come in a wide range of thread specifications, commonly from M3 to M100. For example, common hexagonal bolt specifications used in building structures include M16, M20, M24, etc.; while high-strength hexagonal bolts commonly use M16 to M30. However, the performance of ultra-large high-strength bolts is unstable and should be used with caution.

Length: The length of hexagonal screws can be customized according to needs, with a maximum length of up to 500mm.

Performance Level: The performance levels of regular hexagon bolts include Grade 4.4, Grade 4.8, Grade 5.6, and Grade 8.8, and they are generally made of regular steel materials (such as Q235).

The performance levels of high-strength hexagon bolts are generally Grade 8.8 and Grade 10.9, with Grade 10.9 being the majority. High-strength bolts are made of high-strength steel, such as 45 steel (Grade 8.8s) and 20MnTiB (Grade 10.9S), and are prestressed bolts.

Head size: The head size of a hexagonal bolt corresponds to its thread specification. For example, the head size of an M5 bolt may reach 8.75mm, while the head size of an M8 bolt may be 13.64mm.

Hole size: For ordinary hexagonal bolts, Grade A and B holes are generally only 0.3 to 0.5mm larger than the bolt, while Grade C holes are 1.0 to 1.5mm larger than the bolt.

The difference between the bolt shank and the bolt hole of friction-type high-strength bolts can reach 1.5 to 2.0 mm, ensuring sufficient friction to transmit loads.

The difference between the bolt shank and the bolt hole of pressure-bearing high-strength bolts is slightly smaller, ranging from 1.0 to 1.5mm.

Cross recess screw specifications

Thread specification: The thread specification range for cross recessed screws is also wide, commonly ranging from M1.6 to M10. For example, the thread specifications for cross recessed pan head screws include M1.6 to M10.

The common specifications of cross recessed hexagon head three-in-one screws include various models ranging from M3 to M8.

Length: The length of cross recessed screws is also customized according to specific needs. For example, the length range of cross recessed hexagon head three-in-one screws covers 8 to 45 millimeters, with specific sizes such as 3×8, 4×10, 8×40, etc.

Head type: The head types of Phillips screws are diverse, including pan head, countersunk head, semi-countersunk head, cylindrical head, etc. Different head types are suitable for different application scenarios.

Slot size: The dimensions of the cross slot are strictly regulated, including slot width, slot depth, slot angle, etc. The appropriate size of the cross slot ensures good compatibility with the corresponding cross slot screwdriver, facilitating installation and removal.

Performance level and material: The performance level and material of cross-recess screws are also selected based on specific requirements. For example, the performance levels of carbon steel screws include 4.8, 5.8, etc., while the performance levels of stainless steel screws include A2-70, A4-70, etc.