01
Wire Rod & Bar
In HouseSteel wire rod and bar are checked for grade, diameter and surface before they go to the machines.
Carbon steel · Alloy steel · Stainless steel
MANUFACTURING
From Wire Rod to Finished Part
Two production plants in Ningbo. Cold forging and CNC machining are done in house, heat treatment and finishing by long-term partner plants, and every lot is inspected in our own lab before it ships.
4,000 m²+Plant Area
5Cold Headers
17CNC Lathes
9Machining Centers
01 — HOW WE MAKE IT
Eight Steps, One Line of Control
Forming, machining, threading, inspection and packing happen in our own plants. Heat treatment and finishing go to long-term partner plants, and every lot comes back through our QC.
02
Cold Forging
In HouseFive multi-station cold headers form nuts, bolts and studs from wire rod in a few strokes. Cold forming keeps the grain flow unbroken, so parts come out dense and strong.
5 cold headers · 11B – 31B03
CNC Machining
In HouseSeats, threads, hex profiles and bores are turned and milled to drawing tolerances on our own lathes and machining centers.
17 CNC lathes · 2 Swiss-type lathes · 9 machining centers
04
Tapping & Thread Rolling
In HouseAutomatic tapping machines cut internal threads; thread rolling forms external threads on bolts and studs. Threads are gauged on every batch.
10 automatic tapping machines · thread rolling
05
Heat Treatment
PartnerParts are hardened and tempered to the required strength class at long-term partner plants. We check hardness on every lot that comes back.
Hardness checked in house
06
Surface Finishing
PartnerZinc, zinc flake, zinc-nickel, chrome, black and anodized finishes come from specialized partner plants, each one under our own salt-spray testing.
Salt-spray tested every lot
07
Inspection
In HouseDimensions, threads, hardness and appearance are checked in our own lab before packing. See the lab below.
2 CMMs · vision · optical · hardness
08
Warehouse & Packing
In HouseStandard ranges are kept in stock, packed in bulk or under your label, and shipped worldwide.
Bulk or private label02 — CERTIFICATES
Certified Quality
Our quality management system is certified to IATF 16949, the automotive standard, and our wheel bolts and nuts hold EAC certification for the Eurasian Economic Union. Click a certificate to see it in full size.
IATF 16949:2016Automotive quality management · Manufacture of nuts
EAC Certificate of ConformityTR CU 018/2011 · Wheel bolts and nuts
IATF 16949:2016
Automotive quality management system, audited by an independent certification body. Scope: manufacture of nuts.
EAC · TR CU 018/2011
Ask for Copies
Certificate of conformity for wheel fasteners, required to sell wheel bolts and nuts in Russia and the Eurasian Economic Union.
03 — EQUIPMENT
Equipment List
Taken from our production and inspection equipment ledgers. Machines are added every year; ask us for the current list for your audit.
Production 51 machines
| Equipment | Make / Model | Qty |
|---|---|---|
| Cold Heading Machines | Multi-station, 11B · 14B · 19B · 24B · 31B | 5 |
| Vertical Machining Centers | Hurco VMX42 · VMX30 · VMX24 · VM20 | 5 |
| Horizontal Machining Center | Hurco HTX500 | 1 |
| CNC Machining Centers | T-5A | 3 |
| Mazak CNC Lathes | QT series | 3 |
| Hardinge Precision CNC Lathe | EU 51 | 1 |
| CNC Lathes | Hedman T55, Kaida CK61 series, Huaxing WH400 and others | 13 |
| Swiss-Type Lathes | Tsugami B0205-II | 2 |
| Cylindrical Grinders | M1420 · MM1420 · MMB1420 | 3 |
| Automatic Tapping Machines | DQ-6516 and others | 10 |
| Thread Rolling Machine | ZA28-40 | 1 |
| Hydraulic Press | 40 t | 1 |
| Slotting Machine | B5032A | 1 |
| Turret Milling Machine | 4S | 1 |
| Ultrasonic Cleaning Machine | — | 1 |
| Total | 51 |
Inspection 15 instruments
| Equipment | Make / Model | Qty |
|---|---|---|
| Coordinate Measuring Machine | Zeiss Contura | 1 |
| Coordinate Measuring Machine | LK Ascent | 1 |
| Surface Roughness Testers | Mitutoyo | 2 |
| Contour Measuring Instrument | — | 1 |
| Profile Projectors | — | 3 |
| Height Gauge | Mitutoyo | 1 |
| Optical Shaft Measuring System | Sylvac SCAN S145 | 1 |
| Vision Measuring System | — | 1 |
| Hardness Tester | — | 1 |
| Metallographic Microscope | — | 1 |
| Thread Gauge Testers | Go / no-go | 2 |
| Total | 15 |
04 — INSPECTION LAB
Measured, Not Assumed
A dedicated lab with two CMMs, an optical shaft measuring system, vision measuring, metallography, hardness, roughness and contour instruments. Every lot is checked here before it ships.
2CMMs · Zeiss & LK
1Sylvac optical shaft gauge
15Inspection instruments
Every LotChecked before shipping
05 — QUALITY CONTROL
Checked at Every Step
Our plant is certified to IATF 16949, and our wheel bolts and nuts carry EAC certification for the Eurasian Economic Union. Quality is checked when material comes in, while parts are made, and before they ship.
01
Incoming
- Wire rod and bar checked for grade, size and surface
- Every lot back from heat treatment checked for hardness
- Every lot back from finishing salt-spray tested
02
In Process
- First-piece approval on every setup
- Thread, seat and hex checked during the run
- Go / no-go thread gauges at the machine
03
Final
- Dimensions on CMM, optical and vision systems
- Thread, hardness and salt-spray checks
- Appearance check before packing
SALT-SPRAY TEST
Same Test, Different Result
An ordinary chrome-plated lug nut next to our black lug nut after 150 hours of neutral salt spray.
IATF16949Automotive QMS
EACTR CU 018Wheel Fasteners
06 — SUPPLY CHAIN
One Supplier, a Whole Supply Chain
Most parts need more than one process. Our own plant does cold forging, CNC machining, threading and inspection. For forging, casting, stamping, heat treatment and finishing we work with long-term partner plants close to us, all under our quality system.
12+Long-term partner plants
Close ByAll in Jiangsu, Zhejiang and Shanghai
10+Surface finishes
Every LotInspected by our QC
Hot & Warm Forging
Forged blanks for parts that are too large or too complex to cold-form, then machined in our plant.
Partner plantPrecision Casting
Investment-cast blanks for complex shapes, machined to your drawing in our plant.
Partner plantStamping
Stamped flat parts, brackets and washers for assemblies.
Partner plantSHENZHAO
Our Plant & QC
- Cold forging
- CNC machining
- Tapping & thread rolling
- Inspection & packing
One POOne ContactOne Quality System
Heat Treatment
A full-service heat treatment partner: quench and temper, carburizing, carbonitriding, induction hardening, annealing and normalizing.
Partner plantSurface Finishing
Plating, zinc flake, e-coat and anodizing lines for every common finish. Our plating partner is certified to ISO 14001.
Partner plantISO 14001Plating partner certified for environmental management
Inside Our Partner Plants
01Hot Forging
02Heat Treatment
03Plating
04Partner QC
Checked TwicePartners test their own output. We test every lot again in our own lab when it comes back.
Finishes from Our Partner Network
Each finish comes from a partner plant that specializes in it. Also phosphating, black oxide and other coatings to your specification.
- Partner plants chosen and audited by us, most of them for years
- Every lot inspected when it comes back: hardness, salt spray and appearance
- We move parts between plants, so you get one delivery date
- One purchase order, one contact and one inspection report for the whole part
07 — FAQ
Common Questions
Do you have your own factory?
Yes. We have two production plants in Ningbo, Zhejiang, with cold forging, CNC machining, tapping, thread rolling and inspection in house. Warm forging, stamping, heat treatment and surface finishing are done by long-term partner plants and checked by our QC.
Which certifications do you hold?
IATF 16949 for automotive quality management. Our wheel bolts and nuts also hold an EAC certificate of conformity to TR CU 018/2011 for the Eurasian Economic Union.
How do you control partner quality?
We work with long-term partner plants and inspect every lot when it comes back: hardness after heat treatment, coating and salt spray after finishing.
Can you send an equipment list for our supplier audit?
Yes. We can send the current production and inspection equipment list with our company introduction.
How long have you been manufacturing?
Since 2009. We started as a supplier to OEM and Tier programs and still make parts to customer drawings today.
GET A QUOTE
Quote by Drawing, OE Number or Sample
Tell us what you need. An engineer, not a call center, reviews every request.
- 01Review within 24 hoursWe check your drawing, OE numbers or sample photos.
- 02Quotation & sample planPrice, MOQ, lead time and finish options.
- 03Samples, then mass productionApproved samples become your production standard.
[email protected]
Jiangshan Town, Yinzhou District, Ningbo, China