Keyway Shafts

Keyway Type: Rectangular, Tapered, Spline-type
Standards: ASME, ISO, DIN, or custom
Width Tolerance: ±0.013 mm
Material: 1144 Stress-Proof Steel, 1045 Carbon, 303 Stainless
Keyseat Hardness: 50 HRC minimum

Product Parameters

Item	Specification
Keyway Type	Rectangular, Tapered, Spline-type
Standards	ASME, ISO, DIN, or custom
Width Tolerance	±0.013 mm
Material	1144 Stress-Proof Steel, 1045 Carbon, 303 Stainless
Keyseat Hardness	50 HRC minimum
MOQ	10 pcs

description

Keyway shafts provide positive mechanical linkage between rotating components - matched key and keyway engagements transmit torque reliably without the stress concentrations that interference fits create under heavy loads. The keyway slot acts as a precision guide, eliminating slippage and wear that damage shafts and driven equipment. Milling produces rectangular, tapered, or spline-type keyways to ASME, ISO, or customer-specific standards. Width and depth tolerances of ±0.013 mm ensure proper key seating without excessive clearance - the kind that causes fretting wear between key and keyway walls during continuous operation.

What Happens When Keyway Clearance Is Too Large

Excessive clearance between the key and keyway walls causes fretting - small micromotion that wears both surfaces. Over time, this increases clearance further, creating more fretting. The result is a loose keyway that ratchets under load rather than transmitting torque positively. For high-cycle applications, the tolerance on the keyway is tighter than you might think.

FAQ

Q1: MOQ?

A1: 10 pieces.

Q2: Keyway types?

A2: Rectangular, tapered, spline-type. ASME, ISO, DIN, or custom.

Q3: Tolerances?

A3: Width and depth ±0.013 mm.

Q4: Broach after heat treatment?

A4: Yes. Standard for high-cycle applications.

Q5: Surface hardness?

A5: 50 HRC minimum on keyseat floors.

Q6: Surface finishes?

A6: Black oxide and zinc plating for rust inhibition.

Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.

ISO 9001:2015 - Certified quality management system covering design, machining, and inspection
CMM Inspection - Coordinate measuring for complex geometries and tight tolerances
Surface Roughness Measurement - Ra, Rz, and Rt charting with every inspection report
Passivation / Electropolishing - ASTM A967 procedures for corrosion resistance
Material Traceability - Heat number tracking from raw material to finished part
First Article Inspection (FAI) - Full dimensional report included with every new order

From raw material to finished product, every step is controlled and documented:

Material Preparation - CNC turning/milling to near-net shape
Heat Treatment - Through-hardening or case-hardening for strength-critical parts
Surface Preparation - Degreasing, acid cleaning, and surface activation
Electroplating - Controlled bath process with thickness monitoring
Sealing / Baking - Chrome sealing, anodize sealing, or hydrogen embrittlement relief baking
Inspection - Coating thickness measurement, adhesion testing, and visual check
Packaging - Protective interleaving, VCI packaging, and anti-tarnish wrapping

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