Set Screws: Component Specs, Materials & Applications

Component Specifications

Definition

Set screws are headless fasteners with internal threading designed to secure one object within or against another, typically by exerting compressive force through a pointed or flat tip that contacts the shaft surface. They are commonly used in locking devices to prevent relative motion between assembled parts, ensuring precise positioning and torque transmission in mechanical systems.

Working Principle

Set screws work by creating frictional force between the screw tip and the shaft surface when tightened. The screw is threaded into a tapped hole in the outer component (e.g., collar or hub), and its tip presses directly against the shaft, preventing slippage through mechanical interference rather than clamping force from a nut.

Materials

Typically made from alloy steel (e.g., Grade 8.8, 10.9, or 12.9), stainless steel (A2/A4), or brass. Common coatings include zinc plating, black oxide, or dichromate for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	HRC 28-45 depending on grade
Tip Types	Cup point, flat point, cone point, oval point, half dog point
Drive Types	Hex socket (Allen), slotted, Phillips, Torx
Thread Type	Metric (M3-M20) or Imperial (UNC/UNF)
Torque Specifications	Varies by size and material (e.g., M6 steel: 10-12 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, ISO 4029, DIN 913, DIN 914, DIN 915, DIN 916

Parent Products

This component is used in the following industrial products

Locking Device

A mechanical component within an end bearing assembly that secures bearing elements in position to prevent axial movement or rotation.

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Engineering Analysis

Risks & Mitigation

Over-tightening can damage shafts
Improper tip selection reduces holding power
Corrosion in harsh environments
Thread stripping in soft materials

FMEA Triads

Trigger: Insufficient torque during installation
Failure: Screw loosens, causing component slippage on shaft
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications

Trigger: Vibration in operational environment
Failure: Fatigue failure or loosening over time
Mitigation: Apply thread-locking adhesives and implement regular maintenance checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread tolerance: 6g per ISO 965-1; length tolerance: ±0.5mm for standard sizes

Test Method

Torque-to-failure testing per ISO 898-1; 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 Screws

Manufacturer profiles associated with Set Screws.

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Frequently Asked Questions

What is the difference between cup point and flat point set screws?

Cup point screws have a concave tip that digs into the shaft surface for maximum holding power, while flat point screws distribute pressure over a larger area, minimizing shaft damage and allowing repositioning.

How do I prevent set screws from loosening under vibration?

Use thread-locking compounds (e.g., Loctite), apply proper torque, select cup point tips for better grip, or use double set screws in staggered configurations.

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 Screws