Set Screw: Thread Size M3 to M12 common, Length 5mm to 50mm

Component Specifications

Definition

A set screw is a threaded fastener designed to be inserted into a threaded hole in one component to bear against another component, preventing relative motion between them. In motor hub applications, it secures components like gears, pulleys, or couplings to the shaft by applying compressive force through its tip, which may be flat, cone, cup, or dog point shaped. It functions without a nut and often sits flush or below the surface.

Working Principle

The set screw works by applying axial clamping force through its threaded engagement in a tapped hole. When tightened, its tip presses against the shaft (or another surface), creating friction and mechanical interference that prevents rotational or axial movement. In motor hubs, this secures mounted components to the shaft, ensuring torque transmission and alignment.

Materials

Typically made from alloy steel (e.g., ASTM A574, grade 8.8 or 12.9), stainless steel (e.g., AISI 304 or 316), or brass. Common coatings include zinc plating, black oxide, or dichromate for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	5mm to 50mm
Hardness	HRC 28-45 depending on grade
Tip Type	Cup point (common for high grip)
Head Type	Socket head (hex key drive)
Thread Size	M3 to M12 common
Torque Specification	Varies by size and material (e.g., M6: 10-15 Nm)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 4026, ISO 4027, ISO 4028, DIN 913, DIN 914

Parent Products

This component is used in the following industrial products

Motor Hub

The central rotating component of a cooling fan that connects the motor shaft to the fan blades.

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Engineering Analysis

Risks & Mitigation

Over-tightening causing thread stripping
Insufficient torque leading to slippage
Corrosion in harsh environments
Tip wear reducing grip over time

FMEA Triads

Trigger: Incorrect torque application
Failure: Screw loosens, causing component misalignment or detachment
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications; apply thread-locking adhesive if needed

Trigger: Material fatigue or corrosion
Failure: Screw breaks or seizes, requiring replacement and downtime
Mitigation: Select corrosion-resistant materials (e.g., stainless steel), apply protective coatings, and implement regular maintenance checks

Trigger: Improper tip or size selection
Failure: Inadequate grip leads to slippage and reduced machine efficiency
Mitigation: Choose tip type (e.g., cup point for shafts) based on application; verify dimensions against engineering drawings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread tolerance per ISO 965-1 (e.g., 6g for external threads), length tolerance ±0.5mm

Test Method

Torque testing per ISO 16047, hardness testing per ISO 6508, salt spray testing per ISO 9227 for corrosion resistance

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Set Screw

Manufacturer profiles associated with Set Screw.

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Frequently Asked Questions

What is the difference between a set screw and a regular screw?

A set screw typically has no protruding head and is designed to secure an object within another, often using a tip that digs into the surface, whereas regular screws have heads for driving and are used to join components together.

How do I choose the right set screw for a motor hub?

Consider shaft material, required torque, environmental conditions (e.g., corrosion), and tip type (e.g., cup point for high vibration). Match thread size to the tapped hole and ensure proper hardness and length for secure fastening.

Can set screws be reused?

Limited reuse is possible if undamaged, but repeated tightening can wear the tip or threads, reducing clamping force. Inspect for deformation and replace if in doubt, especially in critical applications like motor hubs.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Set Screw