Custom Phillips Pan Head Sealing Screws with O-Ring and Thread-Locking Patch

Short Description:

Custom stainless steel Phillips pan head sealing screws combine a red O-ring beneath the screw head with a pre-applied thread-locking patch on the machine thread. The O-ring helps reduce moisture, dust, oil and air ingress around the fastening point, while the locking patch increases thread friction to help reduce loosening caused by vibration. Screw dimensions, O-ring compounds, thread-locking materials and surface finishes can be customized according to drawings, samples and assembly requirements.

Product Detail

Product Tags

Item	Specification
Product Name	Phillips Pan Head Sealing Screws with O-Ring and Thread-Locking Patch
Head Type	Pan Head
Drive Type	Phillips or Cross Recessed Drive
Thread Type	Metric Machine Thread, UNC, UNF or Custom Thread
Thread Structure	Fully Threaded or Partially Threaded
Size	According to Customer Drawings or Samples; Special Sizes Available upon Evaluation
Standard	ISO, DIN, ANSI, JIS, GB or Customer Drawing
Material	Stainless Steel, Carbon Steel, Alloy Steel or Other Specified Materials
Strength Grade	Customized According to Material and Assembly Requirements
Surface Treatment	Passivation, Zinc, Nickel, Tin, Black Oxide or Custom Finish
O-Ring Material	NBR, EPDM, Silicone or FKM
O-Ring Color	Red, Black or Customized
Thread-Locking Option	Pre-Applied Nylon Patch, Thread-Locking Adhesive or Customized Locking Material
Patch Position	Customized According to Thread Engagement Length
Tolerance	According to Drawing and Application Requirements
Custom Service	Size, Head, Thread, O-Ring, Locking Patch, Material, Finish and Packaging
Inspection	Dimensions, Torque, Hardness, Material and Optical Sorting
Application	Electronics, Automotive Components, Instruments, Enclosures and Industrial Equipment
OEM / ODM	Supported

Key Product Features

O-Ring Sealing Structure

The O-ring beneath the screw head forms a compressed sealing interface against the mating surface during installation.

Pre-Applied Thread Locking

The blue locking patch increases thread friction to help reduce loosening in assemblies exposed to vibration or repeated movement.

Combined Sealing and Anti-Loosening

The screw combines localized sealing and thread retention in one fastener, reducing the need for separate sealing and locking operations.

Phillips Pan Head Design

The cross recessed drive supports convenient installation, while the rounded pan head provides a broad contact area for the O-ring.

Typical Uses

Electronic Enclosures

Suitable for communication devices, control housings and electronic covers requiring both localized sealing and resistance to vibration.

Automotive Electronics

Applicable to modules, sensors, lamp assemblies and interior components, subject to torque and environmental validation.

Industrial Equipment

Used in machine covers, control panels, automation equipment and housings exposed to dust, oil, moisture or vibration.

Precision Instruments

Suitable for measuring devices, testing equipment and compact assemblies requiring controlled fastening.

Household Appliances

Can be used in appliance panels, control components and internal assemblies where vibration may cause ordinary screws to loosen.

Outdoor Devices

Suitable for protective housings and communication equipment when the selected screw material, O-ring and locking patch are compatible with outdoor exposure.

Product Application

Phillips pan head sealing screws with pre-applied thread-locking patches are designed for assemblies requiring both environmental sealing and resistance to vibration-related loosening. The O-ring compresses beneath the screw head to help reduce ingress around the fastening point, while the locking patch creates additional resistance within the mating thread.

The screw, O-ring, locking patch, mating surface and installation torque should be evaluated as one complete fastening system. Patch position and coverage should match the actual thread engagement area to avoid insufficient locking or installation difficulty.

Why Sealing and Thread-Locking Performance May Fail

Incorrect O-Ring Compression

Insufficient tightening may leave gaps beneath the screw head, while excessive compression may flatten, cut or permanently deform the O-ring.

Locking Patch Outside the Engagement Area

If the pre-applied patch does not contact the mating thread, it may provide little or no anti-loosening effect.

Excessive Locking Torque

An oversized or unsuitable locking patch may increase installation torque beyond the acceptable range for the screw or mating component.

Incompatible Materials

The O-ring or thread-locking material may soften, swell, harden or lose performance after exposure to heat, oil, chemicals or outdoor conditions.

Uneven Mating Surface

Burrs, scratches, gaps or surface contamination may interrupt O-ring contact and reduce sealing consistency.

Repeated Installation

Some pre-applied locking materials provide reduced retention after repeated removal and reinstallation. Reusability should be confirmed according to the selected patch material.

About Our Factory

30+ Years of Fastener Manufacturing

Yuhuang has specialized in standard and custom fastener manufacturing since 1998, supporting product development, sampling and mass production.

20,000㎡ Production Area

Our two manufacturing bases cover approximately 20,000 square meters and support cold heading, thread rolling, machining, inspection and packaging.

In-House Manufacturing Capability

Our production capabilities include cold heading, thread rolling, CNC machining, automatic lathe machining, mold development, O-ring assembly, pre-applied locking treatment and custom packaging.

Laboratory Verification

Available inspection capabilities include dimensional inspection, hardness testing, installation torque testing, loosening torque evaluation, tensile testing, salt spray testing and material analysis.

Quality Management

Our quality management systems include ISO 9001, ISO 14001 and IATF 16949. RoHS and REACH compliance reports can be provided according to the selected material and order requirements.