Fasteners (e.g., set screws): Thread Size M4 to M20

Component Specifications

Definition

Set screws are headless threaded fasteners that apply compressive force through their tip to secure components onto shafts or spindles. In agitator paddle assemblies, they prevent axial and rotational movement by creating friction between the screw tip and shaft surface, typically using a pointed, cupped, or flat tip design. They are installed in threaded holes perpendicular to the shaft axis and are commonly tightened with hex keys or Allen wrenches.

Working Principle

Set screws secure components through friction and mechanical interference. When tightened, the screw tip presses against the shaft surface, creating localized deformation or indentation that prevents relative motion. The clamping force is generated by the screw's tensile strength and thread engagement, with torque directly proportional to the resulting frictional resistance.

Materials

Typically carbon steel (Grade 5, 8.8), alloy steel (Grade 8, 10.9), stainless steel (A2-70, A4-80), or brass. Heat treatment applied for high-strength versions. Surface treatments include zinc plating, black oxide, or dichromate for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	6mm to 50mm
Tip Type	Cup point, flat point, cone point
Drive Type	Hex socket (Allen)
Thread Size	M4 to M20
Tensile Strength	Up to 1200 MPa
Torque Specification	10-150 Nm depending on size

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, ASME B18.3

Parent Products

This component is used in the following industrial products

Agitator Paddles

Mechanical components within a pharmaceutical tablet press feed frame that stir and homogenize powder blends before compression.

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Engineering Analysis

Risks & Mitigation

Vibration-induced loosening
Shaft damage from overtightening
Corrosion in chemical environments
Thread stripping
Insufficient clamping force

FMEA Triads

Trigger: Insufficient torque during installation
Failure: Paddle slippage on shaft leading to imbalance and vibration
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications

Trigger: Corrosion in aggressive media
Failure: Seizure making removal impossible or thread degradation
Mitigation: Select corrosion-resistant materials (stainless steel, brass) and apply protective coatings

Trigger: Fatigue from cyclic loading
Failure: Screw fracture leading to catastrophic paddle detachment
Mitigation: Regular inspection schedules and replacement based on service hours

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-m for general dimensions, thread tolerance 6g/6H

Test Method

Torque-to-failure testing, salt spray testing per ASTM B117, hardness testing Rockwell C scale

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

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Inspection readiness

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Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Frequently Asked Questions

What is the difference between set screws and regular screws?

Set screws are headless and designed to secure components onto shafts by applying pressure with their tip, while regular screws typically have heads and join components through threaded holes.

How do I prevent set screws from loosening in agitator applications?

Use thread-locking compounds, double set screws in staggered positions, or spring washers. Ensure proper torque and consider knurled cup points for better grip.

What tip type is best for agitator paddle applications?

Cup point set screws are most common as they create a circular indentation that provides excellent resistance to rotation, though flat points are used when shaft damage must be minimized.

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.

Fasteners (e.g., set screws)