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Product Description : In high-precision fields such as precision machinery, medical equipment, and high-end electronics—where strict requirements for "protrusion-free positioning" and "extreme environment resistance" apply—the PEEK flat-point hexagon socket set screw has become a core component for achieving "hidden fastening and precise positioning." This is thanks to the excellent weather resistance of PEEK (polyethe

Core Specification Parameters: Key Dimensions for Accurate Selection

The specifications of PEEK flat-point hexagon socket set screws need to focus on two core aspects—"adaptability" and "weather resistance"—and be strictly controlled from three dimensions: size, precision, and performance.

Size Specifications

Characterized by "small size and high precision", the common thread diameters range from M1.6 to M10, adapting to precision positioning needs of different loads:

• M1.6-M3 is commonly used for gear shaft positioning in electronic equipment;

• M4-M6 is optional for rotor locking in small motors;

• M8-M10 can be used for bushing fixation in heavy-duty precision machinery.

The screw length (full thread) varies from 2mm to 30mm, which should be selected based on the wall thickness of the fastened component. Generally, it needs to be embedded into 1/2 to 2/3 of the fastened component’s thickness to ensure stable positioning. For example, when an M3 screw is used to fix a 3mm-thick bushing, a 2mm length is sufficient to meet the limiting requirement.

The flat-point diameter and hexagon socket size comply with industry standards: for instance, an M3 screw has a flat-point diameter of approximately 2.4mm and a hexagon socket across-flats size of 2mm, while an M5 screw has a flat-point diameter of about 4mm and a hexagon socket across-flats size of 3mm—these ensure smooth driving and precise positioning.

Precision Grade

• Thread precision: 5g/6g (external thread), compatible with H7 (internal thread) holes. The fit clearance is controlled between 0.01mm and 0.03mm to prevent positioning deviation caused by excessive clearance.

• Hexagon socket precision: Reaches H13, with a groove wall roughness of Ra ≤ 1.6μm, no burrs, and no edge collapse. It is compatible with high-hardness hexagon wrenches of the same specification, reducing the risk of tooth slipping during driving—especially suitable for automated assembly scenarios.

• Flat-point flatness: The flatness error is ≤ 0.02mm, ensuring tight fit with the surface of the fastened component and avoiding component deformation due to uneven local stress.

Performance Specifications

PEEK material must comply with GB/T 3766 or ISO 5832-12 standards:

• Temperature resistance: Continuous service temperature ≥ 260℃, short-term temperature resistance up to 300℃, suitable for high-temperature scenarios such as precision ovens and motor stators.

• Mechanical strength: Tensile strength ≥ 90MPa, shear strength ≥ 50MPa, meeting the locking load requirements of shaft components.

• Corrosion resistance: No changes after passing a 48-hour neutral salt spray test; no cracking when immersed in medical disinfectants (e.g., 75% ethanol, peracetic acid).

• Low volatility: No pollutants released when used in semiconductor cleanrooms, making it suitable for multiple harsh environments.

Installation and Usage: Key Points from Operation to Maintenance

1. Pre-Installation Preparation: Specification Matching and Tool Selection

• Specification selection based on scenarios:

• For medical equipment (e.g., dental handpiece shaft positioning), prioritize small-size screws (M2-M3, length 2-8mm) to ensure non-magnetism and biocompatibility.

• For new energy vehicle motors (e.g., rotor shaft locking), optional screws (M4-M6, length 5-15mm) balance temperature resistance and vibration resistance.

• For semiconductor equipment (e.g., wafer transfer shaft fixation), screws (M3-M5, length 3-10mm) are required to meet low volatility and cleanliness needs.

• Tool selection for precision requirements:

• For manual installation, use chrome-vanadium steel hexagon wrenches, ensuring the across-flats size of the wrench fully matches the socket (e.g., a 2mm wrench for M3 screws).

• For automated installation, use torque-controllable electric screwdrivers, with preset torque values (0.5-0.8N・m for M3 screws, 1.5-2.5N・m for M5 screws) to prevent thread damage from over-tightening or positioning failure from under-tightening.

2. Installation Steps: Precise Operation for Stability

• Pretreatment: Clean the screw surface and threaded holes to remove oil and metal debris. For medical scenarios, sterilize with high-temperature steam (121℃) for 15 minutes. If the fastened component is made of metal, apply a small amount of PEEK-specific anti-seize agent (e.g., PTFE-based lubricant) to the screw threads to reduce friction and wear between metal and PEEK, while enhancing sealing.

• Screwing and positioning: Align the screw with the threaded hole and gently turn it clockwise 2-3 turns manually to confirm no thread misalignment. Then use a tool to screw it in at a constant speed, with the rotation speed controlled at 5-15r/min to avoid PEEK softening due to high temperatures from high-speed rotation. Stop screwing when the flat-point fits the surface of the fastened component—do not apply excessive force to prevent flat-point deformation or thread slipping.

• Inspection and acceptance: Recheck the torque value with a torque wrench, ensuring the error is ≤ ±8%. Check if the fastened component is free of deviation and loosening. For medical equipment, an additional dynamic balance test is required to ensure no abnormal noise during shaft rotation and a positioning accuracy error ≤ 0.01mm.

3. Maintenance and Taboos: Extending Service Life

• Daily maintenance: Inspect every 3-6 months; for high-temperature scenarios (e.g., inside motors), inspect every 2 months. If screw loosening or surface damage is found, replace with screws of the same specification in a timely manner. Clean and disinfect medical equipment after each use to avoid material corrosion from residual disinfectants.

• Taboo scenarios:

• Prohibit long-term use in environments exceeding 300℃ to prevent PEEK degradation.

• Do not use in strong acid (e.g., concentrated hydrochloric acid) or strong alkaline environments to avoid material corrosion.

• Avoid use in high-frequency vibration scenarios without anti-loosening measures—PEEK anti-loosening washers must be used to prevent screw loosening.

Adaptation Scenarios: Unlocking Precision Needs in Multiple Fields

The characteristics of PEEK flat-point hexagon socket set screws make them irreplaceable in multiple high-precision fields:

• In precision motors, they are used for positioning rotor shafts and bearings—their temperature resistance and non-magnetism avoid interfering with the motor’s magnetic field.

• In medical endoscopes, they fix lens transmission shafts—their disinfection resistance and flat-point design prevent damage to the shaft surface.

• In semiconductor wafer stages, they lock wafer holders—their low volatility and precise positioning ensure the safety of wafer transfer.

Their dual advantages of "precision positioning + weather-resistant fastening" provide key support for the stable operation of high-precision equipment.