Ball-Nose Set Screws | M4 Spherical Contact Positioning Screws

Spring-loaded ball plungers with a spherical tip for locating and cushioning workpieces.

Key specifications

Size rangeM4
MaterialSCM435 steel (stainless ball optional)
FinishBlack oxide, zinc-nickel
Installationadjusted with a hex key
StandardGB/T 3098.1, GB/T 197
Typical substratefixture location, stops, light clamping

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Product overviewOverview

A ball plunger encapsulates a steel ball at the tip of the screw, backed by a spring. The ball contacts the workpiece at a point: contact stress is high but the footprint is small, which suits detents, stops and clamping that needs a little compliance. The spherical tip also lets the force direction adapt to the surface angle, reducing side load.

This page covers M4 in SCM435 steel (stainless ball optional), with black oxide, zinc-nickel as the standard finish.property class 12.9; installed by adjusted with a hex key.

Key featuresFeatures

Spherical tip gives point contact with minimal marking on finished surfaces.
Internal spring provides travel to absorb tolerance and thermal movement.
Hex socket allows the holding force to be trimmed after assembly.
Ball in stainless or bearing steel, retained by a staked front edge.

Typical applicationsApplications

Fixture locating and stops
Mould parting-line detents
Workpiece clamping on automation

Selection notesSelection

Match spring rate to the holding force needed: too stiff dents thin walls, too soft gives an unstable location.

Frequently asked questionsFAQ

How do I specify the Ball-Nose Set Screws | M4 Spherical Contact Positioning Screws?

Match spring rate to the holding force needed: too stiff dents thin walls, too soft gives an unstable location. This page covers M4 in SCM435 steel (stainless ball optional), with black oxide, zinc-nickel as the standard finish.property class 12.9; installed by adjusted with a hex key.

What matters during installation of the Ball-Nose Set Screws | M4 Spherical Contact Positioning Screws?

Set the position, then lock it with a hex key. Spherical tip gives point contact with minimal marking on finished surfaces.

Specifications

Size range	M4
End type	Spherical ball
Material	SCM435 steel (stainless ball optional)
Property class	12.9
Finish	Black oxide, zinc-nickel
Standards	GB/T, ISO
Standard	GB/T 3098.1, GB/T 197
Installation	adjusted with a hex key
Typical substrate	fixture location, stops, light clamping
Key inspections	ball retention, spring travel, thread gauging

Manufacturing and inspection

Ball diameter, protrusion and seating depth are sampled optically.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.