CNC Turned Brass C36000 Knurled Threaded Insert Nut M8 Hexagonal 10mm Height

This knurled threaded insert nut is machined from Brass C36000 (C36000 (CuZn39Pb3)) to ±0.05mm in the critical dimensions, then finished by As machined deburred. It is produced on CNC turning centres that are dedicated to small and medium volume precision work, so every dimension on the drawing is generated by the machine rather than by hand fitting. Typical users are engineers who have already been let down by a supplier that quoted a tolerance it could not hold, and who need the part to fit the first time without sorting or rework on the assembly line.

• Molded In Anchoring: Diamond knurl pattern keys into the plastic boss and resists torque and pull out under vibration
• Free Machining Brass: C36000 turns at high feed with a fine chip, holding thread quality and short cycle time
• Thread Gauged 100 Percent: Every insert is checked with a plug gauge so no cross threaded nut reaches your molding press
• Lead Free Options: Lead free Eco Brass available on request for drinking water and EU market compliance
• Consistent Boss Fit: Outside diameter held to ±0.05mm so press fit depth stays repeatable across the mold cavity

The process route is fixed before metal is cut. Bar stock is verified against the purchase specification and the heat number is logged, then a first article is turned and measured in full. Only after the first article is signed off does the lot run. Critical features on this knurled threaded insert nut are controlled to ±0.05mm with a process capability target of Cpk 1.33 or better, and the operator checks the feature at a defined frequency with the gauge stated on the control plan. Where the drawing calls for As machined deburred, the finishing step is carried out in house and the result is measured, not assumed. Sample parts go to the CMM for full dimensional verification, and the recorded results ship with the lot as a first article inspection report in PPAP level 3 format when a customer program requires it.

Questions are handled by engineers rather than by sales staff. Our team reviews each drawing for manufacturability, flags features that would drive cost without adding function, and proposes the tolerance band that actually matters for the assembly. That review is free and is returned within 24 hours together with a quotation. When a part fails in the field, we ask for the sample back, section it if needed and report what the failure mechanism was, because a supplier that cannot explain a failure cannot prevent the next one.

• Machines: 50+ CNC units including Swiss type lathes, 3, 4 and 5 axis machining centres and turn-mill centres from Citizen, Star, Doosan and Mazak.
• Quality lab: CMM, 2D vision measurement, roughness tester, hardness tester, salt spray chamber and spectral analyser for material verification.
• Team: 15+ mechanical engineers covering DFM review, process design, fixture design and failure analysis.
• Capacity: 500,000+ precision turned parts per month with stable output and on time delivery tracking.
• Quality system: ISO 9001:2015 certified, SGS audited, material traceability from mill heat to finished part.
• Export experience: parts shipped to 30+ countries across North America, Europe, Japan, Korea and Southeast Asia.

Injection molded electronics housings, appliance control boxes, automotive interior assemblies and instrument enclosures that need serviceable metal threads in plastic.

Parts are degreased, dried and packed so that the surface finish specified above arrives intact. Standard packing is VCI paper or individual PE bag, a partitioned foam tray for form features, and an export grade corrugated carton on a pallet, with the lot number and heat number marked on the outside. Parts are warranted against material and workmanship defects for 12 months from delivery. If a part is found outside the drawing, we replace it at our cost and we pay the return freight for the defective lot. Third party inspection by SGS, BV or TUV can be arranged before shipment at your request, and we work under NDA where drawings are confidential.

Q: Which knurl pattern should we choose for a molded boss? A: Straight knurl resists rotation better in soft plastics, diamond knurl gives higher pull out in glass filled resin. Send your resin grade and boss diameter and we will recommend one with a pull out estimate.

Q: Do you supply lead free brass? A: Yes, we run lead free Eco Brass for potable water and RoHS sensitive programs. It machines slightly harder than C36000, so we adjust tooling and confirm thread class with a first article.

Q: Can you supply inserts on tape or in trays for automated molding? A: Inserts can be packed in cavity numbered trays or supplied loose in bulk bags. Tape and reel is available for high volume press side automation.

Q: What is the typical tolerance on the M8 thread? A: Thread is produced to 6H and verified with a GO and NO-GO plug gauge. Pitch diameter readings are logged per lot.

Q: How do you confirm the Brass C36000 material before it is machined? A: Every bar is checked against its mill certificate with an optical emission spectrometer before it goes to a machine. If the chemistry does not match the grade, the bar is rejected and returned. The certificate for your lot is filed under the heat number and can be sent with the shipment or on request.

Q: What happens if a delivered part measures outside the ±0.05mm tolerance? A: Send the measurement and the lot number. We check the recorded values for that lot, replace the parts at our cost and cover the return freight. Because each critical feature is recorded during production, we can trace the deviation to a tool wear step, a fixture shift or a gauge issue and correct the process before the next lot runs.

Send a 2D drawing, a STEP file or a sample and you will have a manufacturability review and a firm quotation within 24 hours. Trial orders from a single piece are accepted, so the tolerance claim can be checked on your own assembly before a production order is placed.