Custom Turned Parts

What We Turn — and Who Asks Us For It

Turned parts are what a lathe produces from bar stock: anything rotationally symmetric — shafts, bushings, spacers, threaded fittings, nipples, pins, adapters. In the American trade these are still called screw machine products, and buyers looking for a precision turned parts manufacturer or a CNC turned parts supplier are usually looking for exactly this: a shop that will cut a specific part from solid, to a specific print, in a quantity that suits them.

If that print already exists, start at parts from your design — drawing, DXF or dimensioned sketch straight to a price and lead time within 12 hours.

Work is produced through qualified manufacturing partners running multi-axis turning centres capable of complex profiles in a single setup — from simple stepped shafts to multi-feature components with threads, grooves, tapers and eccentric features. All turned parts are inspected using calibrated gauges, micrometers and CMM equipment. Material certificates and dimensional inspection reports are provided with every order on request.

Where a Turned Part Beats a Bought One

Most turned components in general use are stocked somewhere, and a stocked part is cheaper than a machined one every time. Turning from bar earns its cost in a specific window — and the honest way to describe that window is to say where it ends.

Your situation	Available off the shelf?	What we would tell you
A standard bushing, spacer or fitting in a catalogue size	Stocked	Buy it. A distributor beats us on both price and lead time
You need 5,000+ of one simple turned part, geometry frozen	Suited to high-volume automatics	A dedicated screw-machine house or cold-former will out-price us at that volume. We will say so rather than quote
The part exists only on your print, and you need 1–50 to prove it	No	This is the window. No die, no mould, nothing to amortise — MOQ 1, quoted in 12 hours
You are mid-development and the geometry is still changing	No	Each revision is a program change, not new tooling. Cutting a mould now would lock in a design you are not finished with
A size between two catalogue steps, or a material the catalogue does not offer in that shape	Not in your combination	Turned from bar in 6061, 7075, 304/316L, 303, C360 brass, 4140 or titanium
The original is worn, and no drawing survives	Discontinued	Measured from your sample, print rebuilt at no charge, then turned

The Part Before the Tooling Exists

A large share of the turned work that reaches us comes from the same moment in a project: an engineer needs a handful of a part that does not exist yet, to put in a machine and find out whether it works.

The routes that serve production do not serve that moment. Casting or cold-forming the part means cutting tooling first — typically four to six weeks before the first sample, with permanent-mould sampling running longer, minimum quantities in the tens to hundreds, and a tooling cost that only makes sense spread over a committed annual volume in the thousands. None of that fits a part whose drawing may change next week.

Turning from bar skips the step entirely. There is no tooling to pay for, so there is no quantity you have to reach — one piece is a normal order, and the second revision costs no more to set up than the first. When the design settles and the volume justifies hard tooling, that is the right time to move the part; we will tell you when you have reached it. Ordering quantities and where that crossover sits are set out on low-volume production.

Technical Specifications

Parameter	Capability
Standard Tolerance	±0.01mm
Precision Tolerance	±0.005mm
Maximum Diameter	Ø 300mm
Maximum Length	1,000mm
Surface Finish	Ra 0.4μm (standard), Ra 0.1μm (ground)
Thread Types	Metric, UNC, UNF, BSP, NPT, ACME
Machine Type	CNC Lathe, Turn-Mill Center
Minimum Order	1 piece
Standard Lead Time	5 working days
Express Lead Time	3 working days (+30–50%)
Quality Standard	ISO 9001:2015

Materials We Turn

• Aluminum: 6061-T6, 7075-T6, 2024, 5052, MIC-6
• Stainless Steel: 304, 316L, 303 (free-machining), 17-4PH, 420
• Brass: C36000 (free-cutting), C26000, C46400
• Carbon & Alloy Steel: 1018, 1045, 4140, 4340, 8620
• Titanium: Grade 2, Grade 5 (Ti-6Al-4V)
• Copper: C11000, C10100, Beryllium Copper — grade choice on our copper machining page
• Engineering Plastics: Delrin (POM), PEEK, Nylon, PTFE, PC
• Nickel Alloys: Inconel 625, Inconel 718, Monel 400

Typical CNC Turned Parts

CNC turning produces any rotationally symmetric geometry — from simple pins and spacers to complex multi-diameter shafts with grooves, threads, tapers and drilled cross-holes. Below are the most common part families we machine:

• Shafts and axles — stepped, splined, keyed, ground finish
• Bushings and sleeves — press-fit, flanged, self-lubricating bronze
• Threaded fittings and connectors — NPT, BSP, metric, JIC
• Pins and dowels — hardened, ground, tight-tolerance
• Flanges and hubs — bolt-circle drilled, keyways, bored
• Nozzles and orifices — precision-drilled, tight ID tolerance
• Spacers and standoffs — any length and OD combination
• Valve bodies and stems — multi-diameter, port-drilled

Turned Parts We Quote Every Week — by Part, Material & Application

These are the specific part families buyers come to us for most often. If your part fits one of these, we can quote it in 12 hours from your drawing, sketch or sample:

Who Gets CNC Turning Quotes From Us?

The four buyer types we serve most — and the specific problem each one comes to us with:

Search Terms — If You Found Us This Way, We Can Quote It

Common searches that lead buyers to EKINSUN for precision turned parts:

Surface Finishes for Turned Parts

The as-turned Ra 0.8μm finish suits most functional parts. Specify a finish on your drawing and we apply it before shipping:

Workshop & Quality Inspection

Every turned part is inspected before it ships. Dimensional checks use calibrated micrometers, plug gauges, ring gauges and CMM scanning. Critical features are reported on a dimensional inspection report — included with aerospace and medical orders as standard, available on request for any order.

Our ISO 9001:2015 certification covers design validation, incoming material inspection, in-process quality gates, and final dimensional verification. Every shipment includes a packing list with part quantity and material grade. Inspection reports, material certificates and FAI reports are available on request.

Frequently Asked Questions