Hole set screw

Secure rotating components with confidence using our precision-engineered Hole Set Screws, also known as hollow set screws or grub screws.
These headless fasteners are specifically designed to sit flush within assemblies, providing a clean, snag-free solution for securing pulleys, gears, collars, and shafts in mechanical and industrial applications.
Unlike traditional screws that rely on a head to clamp components together, our hole set screws transmit holding force entirely through their specialized tip geometry, converting torque into powerful clamping action below the surface.

Hole set screw

Understanding Hole Set Screw Design and Function
Hole set screws feature a fully threaded cylindrical body with an internal drive recess—typically a hex socket—and no protruding head.
This headless design is essential for applications where space is constrained or where rotating parts must pass closely through housings without interference.
When installed into a tapped hole, the screw is tightened against an inner component such as a shaft, creating a mechanical lock that prevents relative movement between parts.

The effectiveness of a hole set screw depends on three critical elements: the drive type, thread specifications, and most importantly, the tip geometry.
Our screws feature a standard cup point tip, which is the most common and versatile point style for general-purpose fastening.
The cup point features a hollowed, cupped rim that bites into the mating surface, distributing clamping force over a circular contact area while creating slight deformation that enhances grip and resists vibration loosening.

Premium Materials for Lasting Performance
Manufactured from high-quality alloy steel, these hole set screws undergo a black oxide surface treatment that provides moderate corrosion resistance while reducing light glare during installation.
Black oxide also helps retain a thin film of lubricating oil, which can be beneficial during tightening and helps prevent galling.
The alloy steel construction ensures the screws meet rigorous hardness requirements, allowing them to withstand significant torque without stripping or shearing.

For applications requiring enhanced corrosion resistance, stainless steel variants are also available.
Stainless steel hole set screws are ideal for outdoor equipment, marine environments, food processing machinery, and any application where rust could compromise performance or contaminate products.

What are the standard sizes available?
Our hole set screws are available in metric coarse thread sizes ranging from M3 to M10, with lengths from 3mm to 30mm to accommodate various assembly thicknesses.
The hex socket drive sizes are precisely matched to each thread diameter for optimal torque transmission—typically 1.5mm hex for M3 screws, up to 5mm hex for M10 sizes.
All screws are fully threaded, providing maximum engagement and holding power regardless of installation depth.

How do I select the correct hole set screw for my application?
Selecting the right set screw involves considering the mating material, required holding force, and whether the assembly will need future adjustment.
For soft materials like aluminum or plastics, the cup point provides excellent grip without excessive penetration.
For hardened steel shafts, the cup point still delivers reliable holding power, though cone point screws may be preferred when maximum axial holding force is required.
If your application involves frequent adjustment or disassembly, consider that cup point screws leave minor witness marks, but these are typically below cosmetic thresholds and do not affect functionality.

Hole set screw

Vibration Resistance and Installation Considerations
One of the most valuable characteristics of cup point hole set screws is their natural resistance to loosening under vibration.
The slight edge deformation created during tightening forms a self-locking effect that helps maintain clamping force even in machinery subject to constant motion or cyclic loads.
For maximum security in high-vibration environments, knurled cup point variants are available, featuring radial serrations that cut tiny grooves into the mating surface for enhanced mechanical interlock.

When installing hole set screws, always ensure the tapped hole is clean and free of debris.
Apply moderate torque using a quality hex key that fits the socket precisely—rounded or worn tools can damage the drive and compromise future removability.
For permanent installations, a thread locker can provide additional security, though many users find the cup point’s self-locking action sufficient for most applications.

Precision Manufacturing for Consistent Quality
Each hole set screw is manufactured to strict dimensional tolerances, ensuring consistent thread fit and socket depth across every piece in every package.
This reliability is essential for production environments where fastener performance must be predictable and repeatable.
Our packaging options range from small quantities for prototyping and repairs to bulk packaging with up to 1,000 pieces for high-volume manufacturing operations.

Can these screws be used in food processing or medical equipment?
For applications with strict contamination controls, we recommend our stainless steel hole set screws.
Stainless steel provides excellent corrosion resistance and is easily cleaned and sterilized.
The absence of a protruding head eliminates crevices where contaminants could accumulate, making these screws suitable for sanitary equipment designs.

Versatile Applications Across Industries
Hole set screws are fundamental components in countless mechanical assemblies.
Common applications include securing conveyor system pulleys, positioning stops on machine rails, locking collars onto rotating shafts, fastening gears to drive shafts, and providing adjustment points in precision instruments.
In furniture manufacturing, they create invisible connections that maintain clean aesthetics.
The automotive industry uses them in steering components and pedal assemblies, while electronics manufacturers rely on miniature set screws for compact device mechanisms.

Upgrade your mechanical assemblies with precision-crafted hole set screws that deliver reliable holding power, vibration resistance, and flush installation.
Choose from our selection of sizes and materials to match your exact application requirements.

Hole set screw available in Mombasa, Kwale, Kilifi, Lamu, Mandera, Marsabit, Isiolo, Meru, Embu, Kitui, Machakos, Makueni, Nyandarua,

Nyeri, Kirinyaga, Murang’a, Kiambu, Turkana, Samburu, Trans Nzoia, Uasin, Gishu, Elgeyo Marakwet, Nandi, Baringo,

Laikipia, Nakuru, Narok, Kajiado, Kericho, Bomet, Kakamega, Vihiga, Bungoma, Busia, Siaya, Kisumu, Homa Bay, Migori, Kisii, Nyamira, Nairobi.

In Nairobi you can find them at: Westlands, Dagoretti,  Lang’ata, Starehe, Kamukunji, Embakasi, and Kasarani, Kibera, Mathare,

Eastleigh, Karen, Lavington, Westlands, Parklands, Runda, South C, South, Ngong Road

In Mombasa you can find us at : Nyali, Mwembe Tayari, Majengo, Likoni ,Bamburi, Miritini