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Mounting Holes/Keyway Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

Mounting holes are precisely drilled or bored openings in a drive sprocket's hub that align with corresponding holes on a shaft or adapter, allowing for secure fastening with bolts or screws. Keyways are longitudinal slots machined into the sprocket's bore that accommodate a mechanical key, which fits into a matching keyway on the shaft to transmit torque and prevent relative rotation. Together, these features provide both axial fixation and torsional locking, ensuring reliable power transmission in chain drive systems.

Working Principle

Mounting holes work on the principle of mechanical fastening through clamping force, securing the sprocket axially against the shaft shoulder or spacer. Keyways operate on positive engagement: the key (typically a rectangular steel piece) is inserted into the aligned keyways of both sprocket and shaft, creating a shear-resistant connection that transfers torque by direct mechanical interference, preventing slippage under load.

Materials

Typically machined from the same material as the sprocket body: carbon steel (e.g., AISI 1045, 4140), alloy steel, or stainless steel (e.g., 304, 316) for corrosion resistance. Keyways are often broached or milled, with hardness matching or exceeding the shaft material to prevent wear.

Technical Parameters

Keyway Depth 1.5-28 mm
Keyway Width 3-56 mm (per ISO/R773)
Bore Diameter 10-200 mm (standard range)
Hole Diameter M6-M24 threads or clearance holes
Tolerance Class H7/h6 for bore, Js9 for keyway
Mounting Hole Pattern 4-8 bolt holes (common)

Standards

ISO 773, DIN 6885, ANSI B17.1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Mounting Holes/Keyway.

Parent Products

This component is used in the following industrial products

Drive Sprocket

A toothed wheel that engages with the track links of a crawler undercarriage to transmit power and propel the vehicle.

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Engineering Analysis

Risks & Mitigation

Keyway fretting corrosion
Bolt loosening due to vibration
Improper key fit causing wear
Misalignment during installation

FMEA Triads

Trigger: Insufficient clamping force from mounting bolts
Failure: Sprocket loosening on shaft, leading to wobble and misalignment
Mitigation: Use calibrated torque wrenches, apply thread-locking compounds, and follow bolt tightening sequences

Trigger: Poor keyway fit (too tight or loose)
Failure: Key shear failure or excessive wear, resulting in torque loss
Mitigation: Machine keyways to standard tolerances (e.g., Js9), use selective fitting of keys, and inspect with go/no-go gauges

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Bore: H7 (ISO 286), Keyway: ±0.025 mm width, ±0.1 mm depth

Test Method

Coordinate measuring machine (CMM) verification, plug gauge for bore, keyway gauge sets, torque testing of fasteners

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a keyway and a spline for sprocket mounting?

A keyway uses a single rectangular key for torque transmission and is simpler/cheaper, suitable for moderate loads. Splines have multiple longitudinal teeth around the bore, providing higher torque capacity, better concentricity, and ease of assembly/disassembly, but are more complex and costly.

How do I select the correct keyway size for a drive sprocket?

Keyway size is determined by shaft diameter and torque requirements. Refer to standards like ISO 773 or DIN 6885, which specify keyway dimensions based on shaft diameter. Calculate shear stress on the key using transmitted torque and key material strength to ensure safety.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Mounting Holes/Keyway