Thread Gauge Manufacturer in China | Custom Gauges | ISO 9001:2015
Gauge Tools & Thread Gauge Manufacturer in China
GageTools is a factory-direct thread gauge manufacturer in Dongguan, China. We make GO/NO-GO thread plug and ring gauges for metric, UN, BSP, NPT and ACME threads, plus pin, step, gap and flush gages and custom inspection gauges built to your drawing. Send your drawing or thread specification and receive a first response within 24 hours on business days.
Single-piece standard orders supported · Drawing review before production · Calibration reports available
Product Families
Thread Gauges, Precision Gauges & Custom Inspection Gages
Gauge tools for production inspection, incoming quality control, supplier audits and high-precision machining. Standard products and made-to-drawing gages are available for OEM buyers and industrial distributors.
GO/NO-GO Thread Gauges
Fast pass/fail thread inspection for production and incoming QC, covering plug gauges, ring gauges and custom thread standards.
View GO/NO-GO Gauges →
Thread Plug Gauges
GO and NO-GO plug gauges for nuts, tapped holes, inserts, pipe fittings and machined internal threads.
View Plug Gauges →
Thread Ring Gauges
GO and NO-GO ring gauges for bolts, studs, shafts and other external threads, with solid and adjustable options.
View Ring Gauges →Gauge Tools for Manufacturing Quality Control
Custom Gauge Manufacturing Services for Automotive, Aerospace and Machining Buyers
GageTools supports production teams that need reliable pass/fail inspection, dimensional verification and repeatable supplier quality control. We manufacture standard and custom gages from drawings, samples or inspection requirements.
Custom Inspection Gages
Custom fixtures, checking gages and special inspection tools for parts that cannot be verified with standard gauges.
View Custom OEM Service →Thread Gauges
Thread plug gauges, thread ring gauges and GO/NO-GO thread inspection tools for Metric, UN, BSP, NPT and custom standards.
View Thread Gauges →Step Gages
Step gages and taper/step inspection tools for high-precision components with multiple diameters, depths or shoulders.
Read Step Gage Guide →Gap and Flush Gages
Gap, flushness and alignment gages for automotive interiors, panels, assemblies and supplier quality checks.
View Gap Gage Guide →How It Works
From Drawing to Delivery in 4 Steps
Send a drawing or complete specification to start your quotation. We confirm the gauge requirements, pricing, documentation and delivery schedule before production.
Send Requirement
Share your drawing, thread standard, size, tolerance class and quantity by email or WhatsApp.
Quote & Confirm
We review your specifications and confirm price, lead time, material and calibration options for approval.
Grinding & Inspection
Gages are CNC ground, lapped and inspected in-house before packing; calibration reports are prepared on request.
Shipment
Finished gages are packed and shipped with the agreed documentation to your delivery address.
Factory Capability
In-House CNC Grinding, Inspection and Calibration Support
Precision gages are ground, lapped and inspected under controlled manufacturing processes. Our ISO 9001:2015-certified quality management system supports production and inspection. For quality-critical orders, calibration reports and measured values can be provided to support incoming inspection and supplier quality control.
- CNC grinding and controlled finishing
- Thread, plug, ring, pin, step, gap and flush gage options
- Metric, UN, BSP, NPT and custom standards
- NIST-traceable calibration chain available
- OEM and made-to-drawing gauge manufacturing
Inside Our Workshop
See Our Precision Thread Grinding in Action
Real footage from our production floor in Dongguan: thread forms are ground on precision grinders with coolant before every gauge is inspected.
Who Uses Our Gauges
Built for Production Floors, QC Labs and Machine Shops
Precision gauge tools from GageTools are typically specified for the following inspection scenarios.
Automotive Suppliers
Incoming inspection and in-process pass/fail checks for machined and stamped components.
Aerospace Machining
Tight-tolerance thread and dimensional verification for precision-machined parts.
General Machining Shops
Fast GO/NO-GO checks on the shop floor to reduce scrap and rework.
Distributors & QC Labs
Standard and custom gauges for resale, calibration services or supplier audits.
Buyer Questions
What Gauge Information Should You Send for a Fast Quote?
A complete specification helps us quote the correct gauge, tolerance and documentation package. Send the details you have, and identify any requirements that need technical review.
- Gauge type: thread gage, plug gage, ring gage, pin gage, step gage, gap gage or custom fixture
- Drawing, thread standard, nominal size, pitch and tolerance class
- GO/NO-GO requirement, wear allowance and inspection method
- Material, hardness, coating or surface finish requirement
- Quantity, target delivery date, shipping country and calibration certificate needs
Buyer Guides
Popular Thread Gauge Guides
Technical guides our buyers use most when specifying thread gauges.
Thread Tolerance Classes Chart
4H, 6H, 7H, 6g and 6e explained, and which GO/NO-GO gauge to order.
Metric Plug Gauge Size Chart
M1–M100 coarse and fine pitches with 6H limits.
UNC vs UNF vs UNEF
Unified inch thread standards and the gauges they need.
NPT vs NPTF vs BSPP vs BSPT
Pipe thread gauges compared for importers and machine shops.
ACME Thread Gauge Guide
Size chart, tolerances and GO/NO-GO inspection.
How GO/NO-GO Thread Gauges Work
The inspection principle and how to use plug and ring gauges.
Thread Gauge Calibration
How often to calibrate and what to check on the report.
How to Order Custom Thread Gauges
12 details to include in your RFQ for a fast, accurate quote.
Thread Standards
Thread Gauge Manufacturer in China: Standards We Cover
As a thread gauge manufacturer in Dongguan, we make GO/NO-GO gauges to the thread system on your drawing, not to a generic catalog profile. The table below shows the standards we work to and the gauge types we supply for each. If your part uses a standard not listed here, send the drawing and we will confirm whether it can be made before quoting.
| Thread system | Gauge standard | Gauges supplied | More detail |
|---|---|---|---|
| ISO metric coarse and fine (M) | ISO 1502 | GO/NO-GO thread plug gauges, thread ring gauges, setting plugs | Metric thread gauges |
| Unified inch UNC / UNF / UNEF | ASME B1.2 | GO/NOT GO plug gauges, adjustable ring gauges, setting plugs | GO/NO-GO thread gauges |
| Pipe NPT / NPTF | ASME B1.20.1 / B1.20.5 | Taper thread plug and ring gauges to the specified gauge type | Quoted per size |
| Pipe BSPP (G) / BSPT (R, Rc, Rp) | ISO 228 / ISO 7 | Parallel and taper plug and ring gauges | Quoted per size |
| Acme | ASME B1.5 | GO/NO-GO plug and ring gauges, custom from drawing | Quoted per size |
| Trapezoidal (Tr) | ISO metric trapezoidal, per drawing | GO/NO-GO plug and ring gauges | Quoted per size |
Acceptance rules differ by standard: under ISO 1502 the NO-GO gauge may enter no more than two turns, while an ASME B1.2 NOT GO gauge may enter no more than three complete turns. Stating the standard on your RFQ avoids mixing the two rules on the same inspection bench.
Selection Guide
Gauge Tools by Inspection Task
Buyers searching for gauge tools or gage tools usually start with a part and a question, not a gauge name. Match the inspection task to the gauge type first, then add size, pitch, tolerance class and standard.
| Inspection task | Gauge type | What to specify |
|---|---|---|
| Accepting tapped holes and internal threads | Thread plug gauge (GO and NO-GO members) | Size, pitch, tolerance class (e.g. 6H, 2B), handle style, left or right hand |
| Checking bolts, studs and external threads | Thread ring gauge (GO and NO-GO rings) | Size, pitch, class (e.g. 6g, 2A), solid or adjustable |
| Setting or verifying ring gauges | Thread setting plug | Matching ring size, pitch and class |
| Pipe thread inspection (NPT, NPTF, BSPT) | Taper thread plug and ring gauges | Thread standard, nominal size and gauge type |
| Special profiles, non-standard pitches, customer-specific limits | Custom gauge from drawing | Drawing or sample, limits, any requirements on your drawing, quantity |
For internal metric threads in the H position, the GO plug is identical across 4H to 7H; only the NO-GO member changes. One GO plug can therefore serve several classes, which reduces cost when you inspect mixed tolerance classes on the same size.
Factory Direct
Why Buy Thread Gauges Direct From the Factory
Many listings for thread gauges come from trading companies that resell stock made elsewhere. That can work for a one-off standard size, but a production plant or QC lab usually gets more from dealing with the gauge maker directly. Our guide on manufacturer vs trader covers this in detail; the short version is below.
- Pricing: no reseller margin, and the quote reflects actual grinding and inspection time for each size.
- Custom capability: non-standard pitches, special lengths and customer limits are made from your drawing instead of being refused or passed to another supplier.
- Documentation: inspection data and calibration certificates come from the same source that made the gauge, so questions about readings are answered directly.
- Reorder consistency: repeat orders are produced to the same records, so replacement gauges match the set already on your line.
Standard sizes ship from stock within 72 hours. Custom gauges take 10–15 working days from drawing approval. The minimum order is one piece, so you can buy a single replacement NO-GO plug or trial a new size before committing to volume. RFQs receive a first response within 24 hours on business days. For private-label programs and drawing-based work, see custom and OEM gauges.
QC & Traceability
Quality, Calibration and Documentation
Every gauge is inspected before it leaves the factory, and our quality system operates under ISO 9001:2015. In practice, that means the following for your incoming inspection team:
- Each GO and NO-GO member is checked against its limits before packing.
- An ISO/IEC 17025 calibration certificate is available on request for gauges that must enter a controlled calibration system.
- Gauges are marked with size, pitch, class and GO or NO-GO identification so they cannot be confused at the bench.
- Serial or identification numbers can be added so each gauge links to its own certificate.
| Certificate item | What it tells you |
|---|---|
| Gauge identification | Size, pitch, class, GO or NO-GO, and serial number |
| Measured values | Actual readings, such as pitch diameter, compared with the specified limits |
| Measurement uncertainty | How much confidence to place in each reading |
| Reference standards | The traceability chain for the equipment used |
| Date and conditions | Calibration date and environment, used to plan your recall interval |
If this is your first time reviewing one, read how to read a thread gauge calibration certificate before your supplier audit.
FAQ
Thread Gauge Manufacturer FAQ: Common Buyer Questions
How can I verify that I am dealing with a thread gauge manufacturer and not a trader?
Ask for photos or video of the grinding and inspection area, sample inspection data for your size, and who issues the calibration certificate. A manufacturer can quote custom sizes from a drawing and give a clear production lead time. A trader usually quotes only catalog sizes and must check with another supplier before confirming custom work.
Can you supply metric and inch thread gauges in one order?
Yes. A single order can combine ISO metric plug and ring gauges with UNC, UNF or UNEF gauges and pipe thread gauges. List each line with its standard and class, since metric and unified gauges follow different acceptance rules. Stock sizes and custom items can ship together once the custom items are ready.
Do you ship thread gauges overseas, and how are they packed?
Yes, we ship to buyers outside China. Gauges are protected against rust and packed so the threads are not damaged in transit. Shipping method and terms are agreed on the quotation, and tracking details are sent once the order leaves the factory.
What is a GO/NO-GO thread gauge used for?
A GO/NO-GO thread gauge checks thread acceptance against the specified standard. Use the GO and NO-GO members according to the applicable inspection procedure, including its engagement limits. It supports fast pass/fail checks during production and incoming quality control; the acceptance rule depends on the thread and gauge standard.
Can GageTools make gauges to a custom drawing or standard?
Yes. We manufacture standard thread, plug, ring, pin, step and gap gauges, and can also produce custom inspection fixtures from your drawing, sample part or written specification. Send the drawing or standard, tolerance class and quantity for a quote.
Is there a minimum order quantity for gauges?
Standard catalog gauges can generally be ordered in small quantities, including single pieces for testing or replacement. Custom gauges made to a specific drawing may have a minimum order quantity depending on tooling and setup cost; this is confirmed case by case in the quote.
Do you provide calibration reports or certificates?
Yes, calibration reports with a NIST-traceable chain are available on request for applicable orders. Let us know at the RFQ stage if you need a calibration certificate, measured values or specific traceability documentation so these can be included in your quotation and shipment.
What thread standards do you support?
We manufacture gauges for Metric, UN (Unified), BSP, NPT and other custom thread standards. If your required standard is not listed, send the thread callout or drawing and we will confirm whether it can be produced.
Where is GageTools based?
GageTools is based in Dongguan, Guangdong, China. The website is operated by Dongguan Zhufeng Precision Technology Co., Ltd. Our manufacturing experience dates back to 2004.
Get in Touch
For the fastest quote, include gauge type, drawing or standard, size, tolerance class, GO/NO-GO requirement, quantity, calibration needs and target delivery date.
Quick RFQ
Send your drawing or thread specification, gauge type, tolerance class and required quantity. Include your delivery country and calibration requirements so we can prepare a quotation covering the gauges, documentation and shipping.
We reply to RFQs within 24 hours on business days. Complex custom specifications may require further technical review before pricing.