Key: Tolerance ISO h9 or similar for fit

Component Specifications

Definition

A key is a precision-machined metal component designed to fit into matching slots (keyways) on both a shaft and a hub, gear, or coupling. It prevents relative rotation between the connected parts, ensuring efficient torque transmission while allowing for easy assembly and disassembly. Keys are critical in power transmission systems where secure, non-slip connections are required.

Working Principle

The key operates on the principle of positive mechanical engagement. It is inserted into aligned keyways on the shaft and hub, creating a rigid connection that transfers rotational force (torque) through shear resistance. This prevents slippage and maintains precise alignment between components under load.

Materials

Typically made from medium-carbon steel (e.g., AISI 1045, C45) or alloy steel (e.g., AISI 4140) for strength and wear resistance. Surface treatments like hardening, black oxide coating, or zinc plating may be applied to enhance durability and corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	Standardized dimensions (e.g., 3mm to 50mm)
Height	Proportional to width per standards
Length	Customized to application
Tolerance	ISO h9 or similar for fit
Shear Strength	Varies by material (e.g., 400-800 MPa)

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 773, DIN 6885, ANSI B17.1, JIS B 1301

Parent Products

This component is used in the following industrial products

Shaft Coupling / Adapter

A mechanical component that connects two rotating shafts to transmit torque while accommodating misalignment.

View Product Details

Engineering Analysis

Risks & Mitigation

Shear failure under excessive torque
Wear or deformation in keyways
Misalignment causing vibration
Corrosion in harsh environments
Improper fit leading to loosening

FMEA Triads

Trigger: Over-torque or shock loads
Failure: Key shears, disrupting power transmission
Mitigation: Use torque limiters, select appropriate material and size

Trigger: Poor machining of keyways
Failure: Loose fit, causing slippage and wear
Mitigation: Adhere to tolerance standards (e.g., ISO h9), inspect during assembly

Trigger: Corrosion or lack of lubrication
Failure: Seizure, making disassembly difficult
Mitigation: Apply protective coatings, use stainless steel in corrosive environments

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 286 for keyway fits, typically h9/H9 for clearance

Test Method

Dimensional inspection with calipers/micrometers, hardness testing per ASTM E18, shear testing per ASTM A370

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 Key

Manufacturer profiles associated with Key.

Sourcing Key from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

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

Frequently Asked Questions

What is the difference between a key and a keyway?

A key is the removable component that fits into keyways, which are the machined slots on the shaft and hub. The keyway provides the seating for the key to create a secure connection.

Can keys be used in high-speed applications?

Yes, but they must be precisely machined to avoid imbalance. For very high speeds, alternatives like splines or interference fits may be preferred to reduce stress concentrations.

How do I select the right key size?

Key size is based on shaft diameter and torque requirements, following standards like ISO 773. Engineering calculations consider shear and crushing stresses to ensure safety.

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.

Key