Torx Cylindrical Head P85 Self-Locking Screw

Star-drive cylindrical-head screw with a P85 locking patch for high-cycle automated driving.

Key specifications

StandardGB/T 90.1, customer drawing
Drive TypeTorx T
Head stylecylindrical head
Drivestar recess

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Product overviewOverview

The P85 patch is applied to the middle of the thread so the first turns run freely and locking begins only in the engagement zone. That distribution keeps driving torque low at the start and stable at the seat, which matters when a robot driver monitors torque gradient.

Sizes, material and finish can be made to drawing, with samples before volume production.

Key featuresFeatures

Patch located in the engagement zone, not at the thread start.
Star recess resists cam-out at M2–M4 torque levels.
Flat bearing face under the head spreads clamp load.
Breakaway torque stable to about five assemblies.

Typical applicationsApplications

Robot joint covers
Camera and sensor brackets
Compact gearbox end caps

Selection notesSelection

Set driver torque from the patch breakaway range, not from the thread strength alone.

Frequently asked questionsFAQ

How do I specify the Torx Cylindrical Head P85 Self-Locking Screw?

Set driver torque from the patch breakaway range, not from the thread strength alone. Sizes, material and finish can be made to drawing, with samples before volume production.

What matters during installation of the Torx Cylindrical Head P85 Self-Locking Screw?

Reuse only up to the count stated on the drawing, since each cycle removes material from the formed thread Patch located in the engagement zone, not at the thread start.

Specifications

Drive Type	Torx T
Standard	GB/T 90.1, customer drawing
Head style	cylindrical head
Drive	star recess

Manufacturing and inspection

Breakaway torque sampled to ISO 2320 at first and fifth removal.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.