KHK USA — Metric Gear Authority

Custom Gears Engineering Hub

Your complete resource for metric gear selection, engineering validation, and technical specification. Explore 611 pages of expert gear content plus 4 free AI-powered engineering tools — built exclusively by KHK USA.

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Product, industry, material & capability guides

Free AI Tools

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Engineering calculators & validators

Years

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Of world-class metric gear manufacturing

Day Delivery

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Factory direct to anywhere in the USA

Gear Products

Browse by Gear Type

KHK USA stocks the widest range of precision metric gears in North America — factory direct in 3 business days.

Metric Spur Gears

The most widely used gear type. KHK's full module range — available in steel, stainless, plastic, and more. Ground precision options available.

Smoother, quieter operation. Ideal for high-speed applications.

Change shaft direction at 90°. Straight and spiral options.

1:1 ratio bevel gears for right-angle drives.

High reduction ratios. Self-locking capability.

Gear Racks & Pinions

Convert rotary to linear motion. Multiple modules.

Internal Ring Gears

Planetary gearbox components. Compact configurations.

Complete reduction gearbox assemblies. Ready to install.

Cross-axis helical gears for skewed shaft drives.

Inch Gears (DP)

Imperial diametral pitch gears from KHK's precision line.

Spur Gears by Module

Find the exact module you need — M0.5 through M10.

Ground Precision

JIS Grade 3–5 ground spur gears for demanding applications.

View All Gear Types

Free Engineering Tools

4 Free AI-Powered Engineering Tools

Built exclusively by KHK USA. Not available from any other gear supplier. Embedded on every page in this hub.

Gear Assembly Compatibility Checker

Validate that your gear set will mesh correctly before ordering. Get an instant engineering verdict with actionable recommendations.

Module & pressure angle match validation
Hunting tooth analysis
Center distance calculation
COMPATIBLE / WARNING / INCOMPATIBLE verdict

Module-to-DP Converter & Cross-Reference

Bi-directional conversion between metric Module and imperial Diametral Pitch with KHK standard module matches.

Instant bi-directional conversion
Closest KHK module matches with deviation %
Side-by-side dimensional comparison
12 most common DP quick-reference grid

Interactive Gear Glossary

Searchable reference of 40 gear engineering terms with definitions, formulas, and direct KHK product links.

Real-time keyword search with highlighting
6 category filters — Geometry, Performance, etc.
Alphabetical navigation A–Z
Direct links to KHK products

Gear Torque & Load Calculator

Full Lewis bending stress analysis for gear tooth strength validation with animated safety factor verdict.

9 KHK material options
Barth velocity factor equation
8 result cards in metric + imperial
Automatic upgrade path recommendations

Industries Served

Gears for Every Industry

KHK USA supplies precision metric gears to the most demanding industries in North America.

Articulated arms, collaborative robots

High-speed packaging & filling lines

Medical Devices

Surgical, diagnostic, cleanroom

Aerospace & Defense

ITAR compliant, precision-critical

Ultra-precision, cleanroom compatible

Industrial automation & controls

Food Processing

Food-grade, washdown environments

Servo-driven precision positioning

Materials

Browse by Material

A comprehensive range of engineering materials for every application requirement.

S45C, SCM415, SCM440

High Strength Machinable Heat Treatable

Corrosion Resistant

Stainless Steel

303, 304, 416 grades

Corrosion Resistant Food Safe Durable

MC Nylon, Acetal, PA66

Lightweight Low Noise No Lubrication

Brass, Bronze, Aluminum

Non-Magnetic Conductive Soft

Vibration Damping Wear Resistant Rigid

High Performance

Carburized & hardened

Case Hardened High Load Precision

S45C normalized

Strong Economical Versatile

Plastic & Non-Ferrous

Lightweight, corrosion-free

Lightweight Corrosion-Free Quiet

Free-machining, food-safe

Free-Machining Food Safe Sanitary

Hardenable martensitic

Hardenable Magnetic Machinable

Manufacturing Capabilities

What KHK USA Can Do for You

Custom & Made-to-Order Gears

Non-stock configurations, special bores, keyways, set screws. Engineering support from quote to final delivery.

500+ Custom Configurations

Ground & Precision Gears

JIS Grade 3–5 precision ground gears for aerospace, semiconductor, and high-accuracy servo applications.

Secondary Operations

Bore modifications, gear finishing, hub alterations, and keyway cutting at KHK's Mineola, NY facility.

Engineering Support

Application engineers available to help you select the right gear, calculate loads, and specify tolerances for your design.

87+ Years of Expertise

ISO 9001:2015 & ITAR Certified

Fully certified for defense and government contracts. Quality management system compliant to ISO 9001:2015 standards.

Factory Direct Manufacturing

All KHK stock gears ship factory direct from Japan to anywhere in the USA within 3 business days.

3 Day USA Delivery

Gear Education

Gear World — Technical Resources

From first-principles explanations to advanced engineering guides — the most comprehensive gear education resource in North America.

What is Gear Module?

Understand the metric gear module system, how it compares to Diametral Pitch, and how to specify the right module for your application.

How to Calculate Gear Ratio

Step-by-step gear ratio calculation for spur, helical, bevel, and compound gear trains with real-world examples.

Gear Terminology Glossary

40 essential gear engineering terms defined with formulas, diagrams, and links to relevant KHK products.

Gear Backlash Guide

Understanding gear backlash — causes, measurement, acceptable ranges, and how to minimize it in precision applications.

Gear Formulas & Calculators

Complete reference of gear geometry formulas, Lewis bending stress, Hertzian contact stress, and center distance calculations.

DP to Module Conversion

Convert between imperial Diametral Pitch and metric Module — full cross-reference table and the conversion formula explained.

Gear Selection Guide

How to choose the right gear type, material, module, and precision class for your specific application requirements.

Gear Lubrication

Lubrication types, viscosity selection, application methods, and maintenance intervals for metric gear systems.

Gear Noise Reduction

Identify the causes of gear noise and vibration, and learn proven techniques to reduce or eliminate them in your drive system.

Explore All Gear Education

Comparisons & Decisions

How KHK Compares

Independent comparisons, buying guides, and decision frameworks to help you choose the right metric gear partner.

KHK USA vs QTC Gears

A detailed comparison of product range, lead times, pricing, material options, and engineering support between KHK USA and QTC.

KHK USA vs SDP/SI

How KHK's metric gear catalog compares to SDP/SI in terms of module range, precision grades, and delivery capabilities.

Best Metric Gear Supplier in the USA

What to look for in a metric gear supplier — and why engineers across North America choose KHK USA.

KHK Recommended Read

Metric vs Imperial Gears

Module vs Diametral Pitch — the complete technical comparison with conversion formulas, compatibility notes, and application guidance.

Stock vs Custom Gears

When to use KHK stock gears vs requesting a custom order — cost, lead time, and performance trade-offs explained.

Why Choose KHK USA

87+ years of manufacturing expertise. ISO 9001:2015 certified. Factory direct from Japan in 3 business days. The metric gear authority.

KHK Advantage Read

KHK USA — Metric Gear Authority

Ready to Specify Your Gears?

Talk to a KHK USA application engineer — or request a custom gear quote online in minutes.

Request a Quote Contact Engineering

ISO 9001:2015 ITAR Certified 3-Day USA Delivery 87+ Years