Question 1

Can I customize gears and shafts?

Accepted Answer

Yes, PairGears provides fully customized gear and shaft manufacturing services tailored to your exact specifications.

Whether you need a single prototype or full-scale production, our engineering team can manufacture gears and shafts in virtually any size, material, and specification. From small precision gears under 50mm to large industrial shafts exceeding 900mm in length, PairGears has the advanced CNC equipment and technical expertise to deliver custom solutions that match your exact requirements.

What We Can Customize

At PairGears, customization goes far beyond simple sizing. Every parameter can be configured to meet your application's unique demands:

Materials

Carbon steel (C45, 1045), alloy steel (4140, 4340, 42CrMo), stainless steel (304, 316), tool steel (H13, D2), aluminum alloy (6061, 7075), brass, bronze, and engineering plastics. Material selection is guided by your application's load, speed, and environmental conditions.

Dimensions & Tolerances

Gear diameter from 10mm to 2,000mm; shaft diameter from 6mm to 300mm; shaft length up to 2,000mm. Tolerances as tight as ±0.01mm with surface finish down to Ra 0.4μm. AGMA 12 / DIN 4 grade gear precision available.

Gear Types

Spur gears, helical gears, bevel gears (straight & spiral), worm gears, ring gears, internal gears, spline shafts, gear racks, sprockets, and custom tooth profiles. Pressure angle, module, and tooth count all configurable.

Heat Treatment

Carburizing, induction hardening, nitriding, quenching & tempering. Achieve surface hardness up to HRC 60-65 with a tough, ductile core for wear resistance and impact toughness in demanding applications.

Surface Finishing

Zinc plating, chrome plating, black oxide coating, phosphating, and anti-rust oil treatment. Each finish is selected based on your operating environment to maximize corrosion resistance and service life.

Custom Packaging

Custom color boxes, branded packaging, export-grade wooden cases, and palletized shipping. We also offer OEM labeling and barcode integration to align with your brand identity and supply chain requirements.

Our Custom Manufacturing Process

Every custom gear and shaft order at PairGears follows a rigorous, step-by-step manufacturing workflow to ensure consistent quality from prototype to production:

1

Design Review & Engineering

Our engineers analyze your 2D drawings, 3D CAD models, or sample parts. We conduct DFM (Design for Manufacturability) analysis to optimize your design for cost, quality, and lead time before production begins.

2

Material Sourcing & Inspection

We source certified raw materials and perform incoming inspection including spectral analysis and ultrasonic flaw detection to guarantee material integrity before machining.

3

Precision Machining

Using advanced CNC lathes, gear hobbing machines, gear shapers, and 5-axis machining centers, we produce your parts with tight tolerances. Key processes include forging, rough turning, gear cutting/hobbing, and precision finishing.

4

Heat Treatment

Controlled carburizing, induction hardening, or nitriding processes create the optimal hardness profile — wear-resistant surface with a tough, impact-absorbing core for maximum service life.

5

Gear Grinding & Finishing

For high-precision applications, gear grinding ensures tooth profile accuracy, reduces transmission noise, and improves meshing efficiency. Surface treatments are applied as required.

6

Quality Inspection

Every batch undergoes dimensional inspection, tooth profile measurement (Klingelnberg P100 or equivalent), hardness testing, and surface roughness verification. Full inspection reports are available upon request.

PairGears Custom Manufacturing Capabilities

Capability	Specification
Gear Diameter Range	10mm – 2,000mm
Shaft Diameter Range	6mm – 300mm
Shaft Length Range	Up to 2,000mm
Dimensional Tolerance	±0.01mm
Tooth Profile Accuracy	±0.005mm (AGMA 12 / DIN 4)
Surface Finish	Ra 0.4 – 1.6μm
Hardness After Treatment	HRC 45 – 65
Minimum Order Quantity	1 piece (prototype/sample orders accepted)
Production Lead Time	15 – 35 days
Industries Served	Automotive, agriculture, construction, industrial automation, aerospace, marine

Precision CNC Gear Machining

Custom Gear Manufacturing Workshop

Industrial CNC machining center for shaft production

Advanced CNC Machining Center

Finished custom metal gears ready for shipment

Finished Custom Gears

Engineer inspecting precision gear components at PairGears

Engineering Quality Control

Why Choose PairGears for Custom Gears & Shafts

20+ Years of Experience

PairGears has been designing and manufacturing precision gears and shafts for over two decades, serving customers across automotive, agricultural machinery, construction equipment, and industrial automation sectors worldwide.

ISO 9001 Certified Quality

Our manufacturing facilities operate under ISO 9001 certified quality management systems. Every batch undergoes rigorous dimensional and material verification before shipment.

Full In-House Production

From forging and rough machining to gear hobbing, heat treatment, grinding, and final inspection — all processes are performed in-house, giving us complete control over quality and lead time.

No Minimum Order Quantity

Unlike many manufacturers, PairGears accepts single-piece prototype orders. This allows you to validate your design before committing to larger production volumes, reducing financial risk.

12-Month Warranty

All custom gears and shafts come with a 12-month warranty against manufacturing defects. Our after-sales team responds within 24 hours to any quality concerns.

Global Shipping

We ship worldwide with export-grade anti-rust packaging and reinforced wooden cases to ensure your custom parts arrive in perfect, factory-new condition regardless of destination.

Important Notes Before Ordering

Provide your specifications: The more detail you provide (2D/3D drawings, material preferences, tolerance requirements, quantity), the faster and more accurate our quotation will be.
Samples available: We offer free samples for quality evaluation (shipping cost applies). This lets you verify fit, finish, and performance before full production.
Design support: Our engineering team can help optimize your gear or shaft design for manufacturability, potentially reducing cost while maintaining or improving performance.

Ready to start your custom gear or shaft project?

Send Us Your Requirements

Question 2

What are the unique advantages of your gear products?

Accepted Answer

Our gear products have the characteristics of high precision, high durability and high performance.

All our products have ready-made molds and tools, which can be produced and delivered quickly.

At the same time, we provide customized services and carry out personalized , design and manufacturing according to the specific needs of customers.

Question 3

What if I don't know the gear model I want?

Accepted Answer

If you have the actual product, you can express it directly to us.

Question 4

What is PairGears' production capacity?

Accepted Answer

PairGears’ typical monthly production capacity is up to 1,000,000 gear and shaft pieces. Actual deliverable output depends on part mix, process route, bottleneck operations, and inspection scope, so we confirm capacity after reviewing your specs and schedule.

What “production capacity” Means

Production capacity generally refers to the maximum output a factory can produce over a defined time period under normal operating conditions, given available machines, labor, and resources.

What Your Available Capacity Depends On

Even with a stated monthly capacity, real scheduling depends on:

• Part mix & complexity (gear type, size, tolerance, finishing requirement)

• Process route (e.g., heat treatment + grinding + gear measurement adds time and resource load)

• Bottleneck operations (when one step cannot keep up, it limits total throughput)

• Inspection/documentation scope (FAI, gear profile/lead reports, PPAP if required)

How We Protect Delivery

We manage capacity and delivery through a controlled plan:

• Lock drawing revision & critical characteristics

• Confirm process route & inspection pack

• Reserve capacity on critical processes (e.g., heat treatment / grinding / gear inspection)

• First-article approval before batch release + QA sign-off before shipment

Quick Reference Table

Item	Standard statement	What it means for your order
Monthly capacity	Up to 1,000,000 gears & shafts / month	Sufficient for repeat orders and ramp-ups (subject to mix & schedule)
Urgent orders	Supportable when a slot is available	We confirm by part route + quantity + required documents
Capacity confirmation	After spec review	Ensures the promised timeline matches bottlenecks & QC scope

Send your drawing/specs + quantity plan + target delivery term (FOB/DDP). We will confirm available capacity slot and provide a delivery milestone plan in the quotation.

Question 5

Does PairGears offer a warranty for its products? What is the warranty period?

Accepted Answer

Yes. PairGears provides a 6-month limited warranty for parts manufactured by PairGears. During the warranty period, if a failure is caused by a manufacturing defect, we will arrange repair or replacement at no charge (subject to claim review). Limited warranties commonly cover defects in materials/workmanship and exclude misuse or improper handling.

What’s Covered

Our warranty is intended to protect you from issues that come from how the part was made—for example, a confirmed manufacturing defect that leads to premature failure within the warranty window.

If the issue is confirmed as a manufacturing defect, we will provide free repair or replacement. The exact remedy may depend on the part status and logistics, but we aim to resolve it quickly and keep your line running.

What’s Not Covered

This warranty does not cover damage caused by:

• Human error, misuse, neglect, or improper installation/operation

• Unauthorized modification or repair

• Normal wear, accidents, or damage after receipt/handling

These exclusions are standard in many “limited warranty” terms.

Item	PairGears Standard Statement	Notes
Warranty type	Limited warranty	Covers manufacturing defects
Warranty period	6 months	Start point per delivery/contract terms
Remedy	Repair or replacement	After claim review
Not covered	Misuse/incorrect installation/modification	Common exclusion pattern
What to provide	PO/part/lot + evidence	Photos, usage conditions, inspection data

When does the 6 months start?

By default, the warranty period is counted from the delivery date (or as defined in your PO/contract). For project-based supply, we can align the start point to your receiving/acceptance procedure if you specify it during ordering.

Practical tip: if you require “warranty from installation/commissioning,” tell us upfront so it can be written into the order terms.

How to file a warranty claim

1. Send your PO number / part number / batch or lot information

2. Share photos/videos, failure description, and operating conditions

3. Provide any inspection data you have (dimensional checks, hardness, gear measurement, etc.)

4. We review and respond with the next action (repair/replacement/return analysis)

To prevent the accidental delivery of non-conforming components, we follow documented non-conforming product control procedures, including identification, isolation, disposal and QA release. The accompanying image is an edited excerpt (details are provided in accordance with the confidentiality agreement).

Nonconforming product control program -PairGears

Question 6

What should I provide if I want to customize gear and shafts?

Accepted Answer

To quote and manufacture custom gears/shafts accurately, please provide either a sample or a detailed drawing, plus the key specs: gear geometry (module/DP, teeth, pressure angle, helix), material & heat treatment, accuracy/inspection needs, and your quantity/lead-time target. If you’re unsure about any parameter, tell us the application and mating parts, and we’ll help fill the gaps.

Option A: You have drawings (fastest)

A complete drawing is the most reliable way to avoid assumptions. At minimum, include datums, critical dimensions, and any functional fits (bearing seats, spline fits, runout). Many gear manufacturing guides emphasize that a successful part starts with clear geometry + material + heat treat + quality requirements.

Option B: You only have a sample (still workable)

If you can send a sample, also share:

• Photos of the mating parts (gearbox layout if possible)

• Any known specs (tooth count, center distance, ratio)

• Failure mode or reason for replacement (wear, noise, broken teeth)

We’ll measure and confirm the tooth data and interfaces before finalizing the quote.

What the quote depends on

Your final cost/lead time and manufacturability mainly depend on:

• Gear accuracy grade & inspection scope (ISO/DIN/AGMA level; profile/lead/pitch/runout checks)

• Material + heat treatment (carburizing/nitriding/Q&T; case depth/hardness targets)

• Process route (hobbing/shaping/skiving vs grinding; whether post-heat grinding is required)

• Order volume & delivery term (trial + batch, FOB/DDP; packaging/document requirements)

The specific information sent to us

1) Gear data (most important)

Please provide as many as you can:

• Tooth count, module/DP, pressure angle, helix angle (if helical), face width

• Bore/shaft interface: keyway/spline, fits, tolerances

• Backlash target or center distance (if known)

(These are common “must-have” tooth data fields in gear machining guidance.)

2) Material & heat treatment

• Material grade (or equivalent)

• Heat treat type (carburize/nitride/induction/Q&T), hardness + case depth targets

3) Quality & documents

• Accuracy grade (ISO 1328 / DIN / AGMA), plus required reports:

• Dimensional report / hardness report / material cert

• Gear profile & lead chart (if required)

4) Commercial info

• Quantity (sample + first batch + annual volume)

• Target lead time and Incoterms (FOB/DDP)

Quick reference table

What you provide	Example items	Why it matters
Drawing or sample	2D/3D, photos, mating part info	Avoids assumptions
Gear tooth data	module/DP, teeth, pressure angle, helix, face width	Determines tooling + process route
Material & HT	20MnCr5/8620 eq., carburize/nitride, hardness/case depth	Drives strength + distortion control
Accuracy & reports	ISO 1328 grade, profile/lead/pitch/runout report	Controls noise/life; defines inspection workload
Accuracy & reports	qty plan, lead time, FOB/DDP	Locks scheduling + logistics plan

Send your drawing (or sample photos) + quantity plan + target accuracy/heat treat. We’ll confirm manufacturability and reply with a quote and timeline.

Question 7

Can I customize gears and shafts?

Accepted Answer

Yes, we can customize gears and shafts of various sizes, specifications, and materials according to your requirements. Whether you need small gears or large shafts, we can provide customized solutions to meet your specific needs. Additionally, we can offer customized package for our customers, include the color box and shipping package.

Question 8

What is the lead time for bulk products from PairGears?

Accepted Answer

For OEM repeat parts with existing tooling/fixtures, our typical production cycle is about 15 days.

For custom gears requiring new tooling, samples usually take ~30 days, and mass production typically takes 15–30 days, depending on specifications and approval steps.

What this lead time covers

In practice, the stated lead time is mainly about order processing + picking/packing (for stock) or production + inspection (for non-stock), followed by shipment release.

If you need “door-to-door arrival time,” that will additionally depend on shipping mode and Incoterms.

What the timeline depends on

• Inventory status & part mix (all items in stock vs partial stock)

• Order volume & packaging requirement (carton vs pallet/crate)

• Inspection/document scope (e.g., standard release vs extra inspection pack)

• Shipping terms & destination (FOB/DDP affects who arranges which leg)

How we keep bulk orders on schedule

• Stock orders: confirmed part list → pick/pack → labeling/traceability → shipment release

• Non-stock orders: drawing/spec lock → production route → in-process checks → final inspection → QA release

We share progress and flag any risks early so you can keep your downstream plan stable.

Typical Timelines

Order Type	Quick reference table	Notes
Bulk products with inventory	Ship within ~1 week	Depends on quantity + packing + release docs
Bulk products without inventory	~30 days	Depends on process route + inspection scope

Send your part list (part number/spec) + quantities + destination + Incoterms. We’ll confirm what’s in stock, the ship date, and the delivery plan in one reply.

Question 9

What is the lead time for customized gears?

Accepted Answer

For customized gears, the first sample lead time is typically 15–30 days. After sample confirmation, the lead time for bulk orders is usually within 30–45 days. Lead time is commonly understood as the time from order initiation/confirmation through production and shipment readiness (and it can vary by process route and release steps).

What this timeline includes

The sample phase usually covers DFM/process planning + tooling/cutters/fixtures (if needed) + machining + heat treatment (if required) + sample inspection + customer approval. Bulk lead time starts after the sample is confirmed, because key dimensions and quality criteria are locked at that point.

What the final lead time depends on

• Tooling / fixtures / cutters: whether new tooling is required and how complex it is

• Process route: grinding, specific heat treatment, and gear metrology add steps and queue time

• Inspection/document package: FAI/full dimensional report, gear profile & lead charts, PPAP (if required)

• Order volume & schedule slot: batch size and bottleneck capacity (heat treat / grinding / gear inspection)

How we keep customized orders on schedule

1. Lock drawing revision & critical characteristics before starting

2. Release a milestone plan (tooling → sample → approval → bulk) with owners

3. Reserve capacity on critical processes (heat treat, grinding, gear inspection)

4. Run sample inspection/FAI before moving to bulk

5. Bulk runs under QA release to keep shipment timing stable

Quick reference table

Stage	Typical lead time
First sample	15–30 days From confirmed specs (drawing/sample + requirements)
First sample	30–45 days Starts after sample confirmation

Send your drawing (or sample photos) + material/heat-treat requirement + accuracy/report needs + quantities. We’ll confirm the sample lead time and a bulk delivery plan in the quotation.