Mounting Holes/Keyway: Keyway Width 3-56 mm (per ISO/R773)

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

Parameter	Typical range	Notes & selection driver
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)

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

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.

View Product Details

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

Typical Suppliers & Equivalents

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

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 Mounting Holes/Keyway

Manufacturer profiles associated with Mounting Holes/Keyway.

Sourcing Mounting Holes/Keyway 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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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 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.

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.

Mounting Holes/Keyway