Precision Turned 1215 Free Cutting Steel Locating Pin 6mm Diameter HRC 45 Chamfered

This locating pin is machined from Free Cutting Steel 1215 (1215 (11SMn30)) to ±0.005mm in the critical dimensions, then finished by Hardened HRC 45 ground shank. 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.

• Ground Pin Diameter: h6 tolerance with 0.005mm straightness gives repeatable location in hardened drill bushings
• Hardened And Tempered: HRC 45-50 resists wear at the contact edge while retaining enough toughness for press fits
• Controlled Chamfer: 30 degree lead in chamfer allows insertion without galling the bushing bore
• Free Cutting Base Material: 1215 resulfurized steel machines and grinds cleanly for a consistent surface finish
• Dimensional Report Per Lot: Pin diameter and straightness are recorded piece by piece on the inspection sheet

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 locating pin are controlled to ±0.005mm 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 Hardened HRC 45 ground shank, 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.

Jigs and fixtures, die locating systems, mold alignment pins, punching tool guides and automated assembly nests.

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: Should the pin be case hardened or through hardened? A: For locating pins we through harden to HRC 45-50 so the whole section resists bending. Case hardening leaves a soft core that can bend under side load.

Q: What clearance do you recommend in a hardened bushing? A: For a 6mm h6 pin in a 6mm H7 bushing the running clearance is 0 to 0.021mm, which is right for hand insertion. Pressed guides need a tighter fit class.

Q: Can you supply pins with a retention groove or thread? A: Yes, we machine grooves, threads, flats and cross holes in the same setup as the diameter so concentricity is preserved.

Q: Do you offer a coating for stainless fixtures? A: We can apply TiN or DLC coating on request for high cycle fixtures. Both add lead time and cost but extend wear life considerably.

Q: How do you confirm the Free Cutting Steel 1215 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 ±0.005mm 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.