Part Type
Custom Machined Shafts & Pins
Round, straight, and exactly the diameter on the print.
Custom machined shafts and pins are axles, drive and stub shafts, dowel pins, locating pins, and clevis pins turned from solid bar to the diameters and features on your print, then ground where the fit has to be exact. Critical diameters get turned to roughly ±0.001 in and ground tighter for slip or press fits, with keyways, retaining-ring grooves, threaded ends, cross-holes, and chamfers added per the drawing. Send a STEP file and a PDF through the quote form and a real person sends back price, material, and lead time in 24-48 hours, with no minimum order.
Updated June 2026
The shaft and pin types that get turned to print
Most rotating and locating parts come down to a handful of shapes. On the shaft side: drive shafts, stub and jack shafts, stepped shafts with shoulders that set bearing positions, splined and keyed shafts that transmit torque, and threaded-end shafts that take a nut or thread straight into a housing. On the pin side: dowel pins that locate one part to another, locating pins for fixtures and assemblies, clevis and hinge pins that carry a moving joint, shoulder pins that double as a stop, and hardened ground pins where wear is the enemy.
The work is the same idea every time: start with round bar, get it concentric and straight, then add the features that make it functional. Whether a part is a one-off replacement axle for a down line or a production batch of locating pins, it gets turned from solid rather than welded up or cast, so the diameters, lengths, and shoulders land where the print puts them.
The features that actually matter
A shaft is rarely just a cylinder. Keyways and keyseats carry torque to a gear or pulley and get cut to a standard key width with a tolerance on slot depth. Retaining-ring (snap-ring) grooves hold bearings and collars in place and need the groove diameter and width held so the ring seats without slop. Ground diameters set the fit: an h6 or g6 shaft for a slip fit into an H7 bore, a tighter interference diameter for a press fit. Threaded ends, cross-holes for roll or cotter pins, and lead-in chamfers round out the part so it assembles cleanly.
Pins lean on the same vocabulary. A dowel or locating pin lives or dies on its ground diameter and the fit it has to hold. A clevis or hinge pin needs a clean bearing surface, a chamfer to start it, and often a cross-hole for a cotter pin. Calling these features out on the drawing, instead of leaving them to be guessed, keeps the first article right. If a part needs a tighter class than turning can hold, precision grinding takes over on the diameters that matter.
Materials and heat treat
1018 is the everyday choice for non-critical shafts and pins: cheap, straight, easy to turn. 4140 and 4140PH step up where torque and bending load get serious, which is most automotive and equipment drivetrain work, and 4140 can be through-hardened then ground for a wear-resistant surface. 303 and 304 stainless cover wet, washdown, and outdoor pins, with 303 the easier of the two to turn. 17-4 PH stainless is the pick when you need real strength and corrosion resistance in the same part, common in industrial and motorsport hardware. Aluminum and brass handle light-duty or non-galling pins where a hard steel would chew up the mating part.
Heat treat is a fit-and-wear decision. Through-hardening raises strength all the way through; case-hardening leaves a tough core under a hard skin for pins that take a pounding. Either way, hardening moves the steel a little, so the sequence is harden first, then grind the running diameters to size. That order is why ground shafts hold tolerance after they are hard.
Tolerances, straightness, and runout
Critical diameters get turned to about ±0.001 in, and ground diameters go tighter into the ±0.0002 in class for slip and press fits. Length and shoulder positions usually live around ±0.005 in unless a bearing stack-up says otherwise, and keyway and groove tolerances follow the print.
Straightness and total runout (TIR) matter as much as diameter on anything that spins. A long shaft can hold every diameter and still wobble if it bows, so a TIR or runout callout referenced to the bearing journals tells the team where concentricity has to be held and where it can relax. If you are unsure which numbers to tighten, a free design-for-manufacturing review flags where tight fits earn their cost and where a looser class saves money without hurting the part.
Questions
Before you send a job.
01 Can you cut keyways and snap-ring grooves on a shaft?
Yes. Keyways, keyseats, retaining-ring (snap-ring) grooves, cross-holes, threaded ends, and chamfers are routine on turned shafts. Call out the key width, the slot depth, and the groove diameter and width on the print, and they get cut to those numbers. A standard key size keeps the part simple, but custom widths are fine when the design needs them.
02 How tight a fit can you hold on a ground diameter?
Turning holds critical diameters to about ±0.001 in. When a slip or press fit needs more, the diameter is ground into the ±0.0002 in class, which covers common h6, g6, and H7 fit pairs. Tell the team the mating bore size or the fit class you want and the diameter is finished to match it.
03 Which material should my shaft or pin be?
1018 covers light, non-critical shafts and pins at the lowest cost. 4140 or 4140PH handles real torque and bending load and can be hardened for wear. Stainless (303, 304, or 17-4 PH) is the call for wet or corrosive duty, and aluminum or brass suits light or non-galling pins. Describing the load and the environment usually settles it in one message.
04 Do you harden and grind hardened pins?
Yes. Steel pins and shafts can be through-hardened or case-hardened, then ground to final size on the diameters that matter. Hardening before grinding is the right order, because heat treat moves the steel slightly and the grind brings the running surfaces back to tolerance. That is how hardened ground pins keep their fit in service.
05 Can I order one replacement shaft, or only batches?
One is a normal order; there is no minimum. A single replacement axle or shaft for a down machine and one-off locating pins are everyday work. Per-piece pricing drops as quantity rises because setup spreads across the batch, so if a few spares would help, the quote can show both numbers.
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