Special-Shaped Screws

Product Introduction

The counterhead hexagon grooved fixing screws are made of high-strength carbon steel, combined with counterhead design (90° cone angle) and hexagon drive structure to provide a flat mounting surface and high torque load-bearing capacity. The head groove design can be used with a flat screwdriver to assist in adjustment, and is suitable for scenes such as shaft sleeve positioning and axial fixation of mechanical components. Surface galvanized/nickel plating or passivation treatment to enhance corrosion resistance. Standard specifications cover M3-M12, suitable for precision instruments, automation equipment and high-precision assembly needs, ensuring stable locking and not loosening.

Features

1. Hexagonal hole: adapted to standard hexagonal wrench (such as 1.5mm-10mm), providing high torque tightening, single-line slotting: compatible with single-line screwdriver assisted fine adjustment, easy to precise positioning

2. Precision countersunk structure 90° conical angle countersunk: flush with the workpiece surface after installation to avoid interference, low profile design: suitable for assembly scenarios with space limitations

3. High-strength material selection, carbon steel: 8.8 grade/12.9 grade high-strength, surface galvanized/nickel plating (salt spray resistant 72h+) stainless steel: 304/316 material, corrosion resistant (316 salt spray resistant 96h+)

4. Professional locking function, tapered end: provides radial locking force to prevent the shaft from sliding relative to the sleeve, high hardness treatment: hardness HRC28-45 (carbon steel), HRB80-90 (stainless steel)

5. Surface treatment process, electroplating: galvanized (blue and white/color zinc), nickel plating, passivation: stainless steel electrolytic polishing + passivation

6. Widely adapted to specifications, metric specifications: M3-M12, length 5-50mm, US specification #4-1/2", supports non-standard customization

7. Typical application scenarios, the shaft and the hub are positioned and locked, the axial fixation of the synchronous pulleys and gears, and the precision instrument adjustment mechanism

Product Application

1. Synchronous pulley fixing: The tapered end accurately locks the transmission shaft to prevent radial displacement (torque ≥5N·m) Axial positioning of the gear: The counterhead design avoids interference with adjacent gears, and adapts to the gear set with a modulus of 0.5-2mm

2. Key connections of automation equipment: robotic arm joint locking: 12.9-level high-strength steel screws withstand 20,000 reciprocating vibration tests without loosening, linear guide rail installation: M6 screws and anti-loosening glue achieve ±0.01mm repeat positioning accuracy

3. Power transmission parts: Motor bushing fixing: 316 stainless steel material resistant to motor temperature rise (≤150℃) Coupling positioning: Grooved design facilitates fine-tuning of phase angle on site

4. Precision adjustment of instruments and instruments: Optical platform leveling mechanism: M4 screw counterhead structure ensures that the laser path is unobstructed, sensor bracket locks: nickel plating treatment prevents electromagnetic interference

5. Core components of transportation equipment: New energy vehicle motor: pass IP67 protection certification, resistant to salt spray for 1000h, high-speed rail bogie: 10.9-grade carbon steel screws meet EN15085 welding standard

Product Advantages

1. The hexagonal hole (ISO 10664 standard) provides the main torque channel, with a maximum torque of 50N·m, and a single-slot design, allowing fine adjustment of ±15° deflection angle, and the adjustment accuracy is up to 0.1°

2. Patented anti-slip mark at the bottom of the hexagonal hole (patent number CN2023XXXXXX) still maintains torque transmission efficiency of more than 85% in oily environments

3. The 90° cone angle of the countersunk head is optimized by FEA analysis, the stress concentration coefficient is reduced by 40% and the neck strengthens the design, and the fatigue life is up to 10^7 cycles (DIN 267 standard)

4. The cone end angle is 60°±1°, generating radial locking force ≥2000N (M6 specification). Selectable end type: flat end/conical end/concave end, suitable for different working conditions

FAQ

Q1: How to choose the usage scenario of a dual-drive structure?

A1: Hexagon dominant mode (when high torque is required): Use a standard hexagon wrench (refer to the table below for recommended torque) for final tightening stage (±5% accuracy control) for one-slot auxiliary mode (when precise adjustment is required): use a one-slot screwdriver to fine-tune (maximum adjustment angle ±15°) for preload calibration/phase alignment scenarios.

Custom-Made Special-Shaped Screws

Stainless Steel Special-Shaped Screws