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

Do you provide a warranty for your gears, and if so, how long is it?

Accepted Answer

Yes. PairGears provides a 6-month limited warranty for parts manufactured by PairGears. If a failure is confirmed to be caused by a manufacturing defect within the warranty period, we will arrange repair or replacement.

What’s covered

This warranty covers issues caused by manufacturing defects (e.g., confirmed nonconformance linked to production/heat treatment/manufacturing control), based on claim review and evidence.

What’s not covered

The warranty does not cover damage caused by misuse, incorrect installation/operation, unauthorized modification, or human error. Normal wear and damage after improper handling are also excluded.

How to file a warranty claim (steps)

1. Provide PO/part number/lot or batch info

2. Share photos/videos and a brief failure description (running conditions help)

3. Provide any available inspection data (if you have it)

4. We review and confirm the remedy (repair/replacement/return analysis)

Send part number + PO + lot/batch info + photos/videos. We’ll confirm the next steps quickly.

Question 3

Do you offer information on ISO or DIN Standards?

Accepted Answer

Yes. We can provide practical guidance on common ISO and DIN standards used for gears—such as how an accuracy grade is specified on drawings and how it maps to inspection outputs. If you share your drawing note (ISO/DIN/AGMA grade), we’ll align the measurement/report package accordingly.

What we can help you with

1. Identify which standard/grade your drawing is referencing

2. Explain what the key accuracy items usually mean (profile/lead/pitch/runout)

3. Confirm what inspection evidence can be provided for that requirement

4. Help clarify “equivalent” expressions between standards (when applicable)

Gear Accuracy Grades-Comparing of Standards

What it depends on

1. Gear type (spur/helical/bevel/worm) and application sensitivity

2. Which standard is specified (ISO vs DIN vs AGMA)

3. Whether you need explanation only, or explanation + full inspection charts

4. How strict the acceptance criteria are (critical characteristics)

Reference blog

1. ISO Standards in Gear Manufacturing: A Detailed Overview

2. Understanding AGMA Standards: A Key to Gear Quality Control

3. Understanding DIN Standards in Gear Manufacturing: Ensuring Precision and Reliability

Quick table

You provide	We return	Why it helps
Standard/grade note on drawing	Interpretation + report plan	avoids mismatch
Target accuracy items	recommended inspection scope	saves cost/time
Application info	practical tolerance discussion	reduces risk

Send the ISO/DIN note from your drawing (or your target grade). We’ll confirm how we interpret it and what inspection outputs we’ll provide.

Question 4

Can you share a sample inspection report for reference?

Accepted Answer

Yes. We can share a redacted sample inspection report to show the typical report format and scope (e.g., dimensional results, hardness, and gear profile/lead charts if required). Sensitive customer/project identifiers will be removed.

What a “sample inspection report” usually contains

Depending on the part and requirement, it may include:

1. Dimensional inspection results (key dimensions, datums)

2. Hardness / case depth (if heat treated)

3. Gear measurement pages (profile/lead/pitch/runout) when specified

4. Summary judgment and traceable identifiers (lot/date)

What you can request

√ Full dimensional (FAI-style) vs key characteristics only

√ Gear charts required or pass/fail summary only

√ Sampling plan (per piece vs per batch)

How we handle confidentiality

We can share:

1. Generic format samples

2. Redacted pages without customer name, drawing number, or pricing

3. For full project-level samples, we usually proceed under NDA.

Quick table

Report type	Best use	Notes
Dimensional report	onboarding / first order	shows measurement approach
Hardness/HT report	heat-treated parts	confirms HT targets
Gear profile/lead charts	high precision gears	clarifies metrology scope

Tell us what report you need (FAI, gear charts, hardness/case depth). We’ll share a matching redacted sample and confirm what will be included with your order.

Question 5

Can you provide traceability from raw material to final inspection for repeat orders?

Accepted Answer

Yes. For repeat orders, we can provide lot/batch traceability linking raw material (heat/batch) to key process records and final inspection for the shipped lot. The exact traceability depth depends on your program requirements and documentation package.

What “traceability” typically includes

Traceability usually connects:

1. Raw material heat/batch → material certificate (when requested)

2. Process/operation records (as applicable)

3. Heat treatment record (when applicable)

4. Final inspection report + shipment lot identification

What the traceability depth depends on

√ Your document pack requirement (COC only vs full pack)

√ Whether you require per-lot or per-piece tracking

√ Critical characteristics that must be linked to inspection data

√ Any customer-specific format (vendor portal templates)

How we maintain traceability

1. Assign lot/batch ID for production and inspection

2. Record key checkpoints under the same lot ID (materials/HT/inspection)

3. Mark packaging and shipment documents with the lot reference

4. Provide traceability documents with shipment, as agreed

Quick table

What you ask for	What we provide	Best for
Basic lot traceability	lot ID + final inspection + shipment link	standard repeat orders
Material + HT + inspection link	certificates + HT report + inspection	higher QA programs
Custom format	mapping to your template	onboarding / key accounts

Share your traceability requirement (lot vs piece, required documents). We’ll confirm the traceability level and include it in the inspection pack for repeat orders.

Question 6

Do you provide FAI / PPAP / COC / material certificates?

Accepted Answer

Yes. We can provide FAI, COC (Certificate of Conformance), and material certificates as part of the shipment documentation when required. PPAP-related documents can also be supported for customer programs that require them. The exact document set is confirmed during quotation and onboarding.

What we typically provide

→ COC/COA: confirmation the shipped lot meets agreed requirements

→ Material certificate: material grade/heat/batch information (as available/required)

→ FAI (First Article Inspection): first-sample dimensional verification (scope agreed)

→ PPAP package items: provided per customer requirement level and NDA

What affects the document package

√ Customer requirement (standard pack vs full pack)

√ Sampling plan (per piece vs per lot)

√ Whether gear charts (profile/lead/pitch) are required

√ Confidentiality/NDA and customer-specific templates

How we make reports useful

We align charts to your functional datums and critical characteristics so you can see:

1. Where the deviation occurs (shape vs slope)

2. Whether it’s stable or drifting (process consistency)

3. What the risk is for noise/backlash/life (when relevant)

Steps

1. Tell us the required documents in your RFQ

2. Confirm submission format (PDF, portal, template)

3. We include the document pack in the quote and delivery plan

4. Documents are released with shipment (or at sample approval stage)

Quick table

Document	When it’s used	Typical timing
COC	every shipment (if requested)	with shipment
Material cert	critical material control	with shipment
FAI	new part / first order	at sample approval
PPAP	automotive programs	per agreed schedule

Share your required document list (FAI/PPAP/COC/material cert + gear charts). We’ll confirm scope and include it in the quotation and inspection pack.

Question 7

Can you provide tooth profile/lead charts and explain what “pass/fail” looks like?

Accepted Answer

Yes. We can provide tooth profile and lead charts and explain “pass/fail” by comparing measured deviations against the tolerance limits on your drawing (or the agreed standard/grade). “Pass” means the results stay within limits for the specified items.

What “pass/fail” actually means

“Pass/fail” is not a simple checkbox. It’s a judgment based on:

• Measured deviation (curve/values from the gear measuring report)

• vs allowed tolerance band (upper/lower limits)

If the curve or values exceed the tolerance band, it’s fail for that parameter.

What we include in the explanation

√ Which parameter is being checked (profile/lead/pitch/runout)

√ Which tolerance/grade applies

√ Where the deviation occurs (localized vs systematic trend)

√ What action is recommended if it’s close to the limit (extra check or process adjustment)

Quick table

Item	What you see	“Fail” typically means
Profile	curve vs tolerance band	curve exceeds the band
Lead	slope/shape vs band	trend out of band
Pitch (if included)	spacing values	one/more points out

Tell us your standard/grade and whether charts are needed for samples only or each batch. We’ll include the report package in the quotation.

Question 8

Can you provide full gear measurement charts (profile/lead/pitch), not just pass/fail results?

Accepted Answer

Yes. If required, we can provide full gear measurement charts—including tooth profile, lead, and pitch—not just pass/fail. The report scope is confirmed during quotation (sample stage vs mass production, and which parameters are critical).

What you’ll receive

Depending on your requirement, we can provide:

1. Tooth profile chart

2. Tooth lead/helix chart

3. Pitch / spacing results

4. Runout / span over pins (as applicable)

5. Summary judgment (pass/fail) with tolerances referenced

What affects report availability

√ Drawing references/standard (ISO/DIN/AGMA) and tolerance definition

√ Whether it’s FAI/sample approval or routine batch release

√ Required sampling plan (per part / per batch / per shift)

√ Confidentiality level (redaction needed)

How we make reports useful

We align charts to your functional datums and critical characteristics so you can see:

1. Where the deviation occurs (shape vs slope)

2. Whether it’s stable or drifting (process consistency)

3. What the risk is for noise/backlash/life (when relevant)

Quick table

Report type	What it shows	Typical use
Profile chart	involute deviation	mesh quality / noise
Lead chart	helix/lead deviation	contact pattern / load
Pitch results	spacing deviation	smoothness / transmission

Tell us your required standard and tolerance grade, and whether you need charts for samples only or for every batch. We’ll include the report package in the quote.

Question 9

Can you provide a landed cost estimate (FOB/CIF/DDP) and typical shipping options for my region?

Accepted Answer

Yes. We can provide a landed cost estimate under FOB/CIF/DDP and recommend typical shipping options once we know your destination and basic shipment details (weight/volume, sample vs bulk).

What we can quote

FOB: product price + export packing + delivery to port & export docs (as agreed)

CIF: FOB scope + ocean freight + insurance to destination port

DDP: delivery to named address with import-side handling included (scope confirmed case-by-case)

Typical shipping options

Samples: express courier (fast, trackable)

Urgent small/medium: air freight

Bulk orders: ocean freight (LCL/FCL) for cost efficiency

What the estimate depends on

1. Destination (city/port) + delivery point (port/door)

2. Incoterms (FOB/CIF/DDP) + shipping mode preference

3. Packing type + gross weight + volume (CBM)

4. Any special compliance/docs (labeling, import requirements)

Quick table

You send	We return	Notes
Destination + Incoterms	Landed cost estimate	Estimate, not final tax ruling
Weight/CBM + packing	2–3 shipping routes	Cost vs time comparison
Urgency + budget	Recommended option	Best-fit plan

Send destination + Incoterms + estimated weight/CBM. We’ll reply with a landed-cost estimate and recommended shipping options for your region.

Question 10

Can you produce according to the samples?

Accepted Answer

Yes. We can produce gears and shafts based on physical samples. For best accuracy, sample-based projects usually require measurement + confirmation before cutting tooling, so the first-sample timeline may be longer than drawing-based projects.

When sample-based production works best

Sample-only is a good fit when you’re replacing an existing part or you don’t have drawings. It’s especially effective if you can provide mating-part information so we can confirm fits and functional targets.

What affects cost and lead time

1. Sample condition (wear/damage can distort geometry)

2. Measurement depth (basic dimensions vs full gear metrology)

3. Need for multiple samples (to filter out wear influence)

4. Accuracy/inspection requirements (profile/lead/pitch reports, etc.)

Steps

1. Sample intake + application review

2. Measurement + manufacturing definition (drawing/CAD)

3. Quote + first sample plan

4. Sample inspection + your confirmation

5. Bulk production after approval

Quick table

What you provide	What we do	Typical impact
1 sample only	Measure + rebuild definition	Higher uncertainty
2–3 samples	Cross-check geometry	Lower risk
Sample + mating info	Fit/function review	Faster confirmation

Send your sample and quantity plan. We’ll confirm manufacturability, lead time, and the inspection pack options in the quotation.

Question 11

Can you manufacture gears to our drawing / sample?

Accepted Answer

Yes. We can manufacture gears from your drawing or from a physical sample. A complete drawing is usually the fastest route; a sample is most useful when you want match-fit verification or the drawing is incomplete.

When a drawing is enough

If your drawing includes tooth geometry, tolerances, and material/heat-treat requirements, we can quote → make samples → then move to bulk after approval. Clear “first article” validation is commonly used to confirm the first produced part meets requirements before scaling up.

When a sample helps

A sample helps when:

• Tooth data or tolerances are missing on the drawing

• You’re replacing an existing part and need match-fit to mating parts

• You want to benchmark wear/noise/backlash performance using a “known good” reference

What we need to quote accurately

1. Drawing (2D/3D) or sample + photos of mating parts

2. Gear data (module/DP, teeth, pressure angle, helix angle if any, face width)

4. Material & heat treatment (hardness/case depth targets if applicable)

5. Accuracy/inspection requirements (dimensional + gear profile/lead if required)

6. Quantity plan + Incoterms (FOB/CIF/DDP)

Quick table

Input	Typical result	Notes
Complete drawing	Drawing + sample	Lowest ambiguity
Drawing + sample	Lower risk for first order	Best for match-fit
Sample only	Extra measurement & confirmation	More time upfront

Send your drawing/sample and quantity plan. We’ll confirm manufacturability, lead time, and the inspection pack options in the quotation.

Question 12

Can you make a custom precision gear from a drawing, or do you need a sample too?

Accepted Answer

We can manufacture a custom precision gear from a complete drawing alone. A sample is helpful but not always required—it’s mainly used when drawings are incomplete, revisions are uncertain, or the mating-fit needs real-world verification. First-article inspection is commonly used to validate the first produced part against requirements before scaling to production.

When a drawing is enough

A drawing is usually sufficient when it includes:

• Tooth data (module/DP, teeth, pressure angle, helix, face width)

• Datum scheme, tolerances, fits, and material/heat treat requirements

• Required inspection outputs (dimensional + gear metrology scope)

When we recommend adding a sample

A sample helps when:

• The drawing is missing tooth details or tolerance stack info

• You’re replacing an existing part and need match-fit to mating parts

• The application has sensitivity to noise/backlash and you want a “known good” reference

What it depends on

1. Drawing completeness (geometry + tolerances + heat treat)

2. Accuracy target & inspection scope (higher grade needs clearer definition)

3. Mating-part uncertainty (center distance/backlash constraints)

4. Revision control (frequent changes → sample helps align expectations)

Quick table

You provide	We can do	Notes
Complete drawing	Quote → sample → bulk	Fastest, lowest ambiguity
Drawing + sample	Quote with lower risk	Best for first order / match-fit
Sample only	Reverse-engineer + confirm	More time/cost upfront

Send your drawing (PDF/STEP) and tell us your quantity plan + target accuracy + heat treat. If you also have a sample, mention it—we’ll advise whether it adds value for fit verification.

Question 13

Can a supplier make precision gears from a sample only, and how does that affect cost and lead time?

Accepted Answer

Yes—a supplier can manufacture precision gears from a sample only, but it usually increases engineering/measurement work, which can raise cost and extend lead time, especially for tight tolerance or high accuracy grades. Reverse engineering typically requires accurate geometry capture and CAD definition before production.

What “sample only” typically involves

When there is no drawing, the supplier must create a “manufacturing definition” by:

• Measuring interfaces and tooth geometry

• Rebuilding CAD/drawings

• Validating fits and functional targets (noise, backlash, contact pattern where applicable)

How it affects cost

Cost may increase due to:

• Metrology time (more measurement and verification)

• Potential need for multiple samples (to separate wear from original geometry)

• More iteration in prototype validation (fit/mesh test)

• Additional tooling decisions (cutters/fixtures) driven by rebuilt geometry

How it affects lead time

Lead time often increases because you add steps before cutting chips:

1. Sample receipt & evaluation

2. Measurement + CAD/drawing reconstruction

3. Internal review + customer confirmation

4. Sample manufacturing & inspection

5. Bulk after sample approval

Quick table

Input you have	Typical impact	How to reduce impact
Sample only	Higher engineering effort → cost/lead time ↑	Provide mating part info + multiple samples
Sample + basic specs	Moderate	Share module/teeth/center distance if known
Full drawing	Lowest risk & fastest	Lock critical characteristics early

If you only have a sample, send 2–3 samples if possible, plus where it runs (gearbox model / mating gear photos). We’ll confirm the reverse-engineering scope and give you a quote with a realistic timeline.

Question 14

Can I request measurement of other manufacturer’s gear products?

Accepted Answer

Yes—we can measure third-party gears and provide inspection data as long as the part is legitimately obtained and the request doesn’t violate NDA/IP restrictions. Measurement scope depends on what you need (dimensions only vs full gear metrology) and what references you can provide (mating parts, application, drawings). Reverse engineering is often lawful when a product is legitimately obtained, but IP/trade-secret risks must be managed carefully.

When we can support

If you have an existing gear/shaft that needs replacement, benchmarking, or fit verification, we can:

• Measure key interfaces (bore/shaft fit, runout, faces)

• Measure tooth data and provide a report (when feasible)

• Build a “manufacturing drawing” for quotation and production (under agreed terms)

What it depends on

1. Ownership & restrictions: whether the part is yours to share and not under NDA/confidentiality

2. Measurement depth: basic dimensional checks vs full gear inspection (profile/lead/pitch)

3. Part condition: wear/damage may distort measured values (we may request multiple samples)

4. Application context: mating part info affects how we interpret fits/backlash targets

How we control quality and risk

1. Confirm the part is legitimately obtained and free of contractual restrictions

2. Define measurement scope and acceptance references (what “good” looks like)

3. Run measurement + issue a report; for reverse-engineered manufacturing, we’ll confirm critical interfaces with you

4. If production is needed, we proceed to sample → confirmation → bulk under controlled revision

Quick table

Document	When it’s used	Typical timing
COC	every shipment (if requested)	with shipment
Material cert	critical material control	with shipment
FAI	new part / first order	at sample approval
PPAP	automotive programs	per agreed schedule

If you’re onboarding a new supplier, send your vendor questionnaire or request an Audit Pack. If you have a part to quote, share your drawing/spec + quantity plan, and we’ll respond with a process route, lead time, and inspection pack options.