AGMA Member CompanySince 1946East Walpole, MA
AGMA Member CompanySince 1946East Walpole, MA
Custom splines and spline shafts
Commercial Gear & Sprocket manufactures custom internal and external splines, spline shafts, involute and straight-sided splines and serrations for OEMs, machine builders, replacement applications and industrial equipment.
Splines made to your specifications
Splines connect shafts and mating components while transmitting rotary motion and torque. Tooth geometry, fit, alignment and dimensional accuracy all decide how well the complete assembly performs.
We manufacture internal and external splines to your drawings, spline type, fit, dimensions, tolerances and material — involute and straight-sided splines, spline shafts, O.D.-fit and side-fit splines, SAE and metric serrations, and custom configurations. Send drawings, specifications, samples or your own components for review.
Spline types, fits and manufacturing range
Shaft length
Up to 36″
Internal or external splines and spline shafts up to 36 inches long.
Spline type
Internal & external
Mating internal and external splines.
Tooth forms
Involute & straight-sided
Both tooth forms, to your drawing.
Fit types
O.D. fit & side fit
Serrations
SAE & metric
We work to American National Standard involute splines (ANSI B92.1), metric DIN 5480, SAE and metric DIN 5481 serrations, and straight-sided spline sizes and fits. Your drawing and specified standard control each project.
How we manufacture custom splines
Specialized spline-generating equipment, gear-cutting machinery, CNC machining and calibrated inspection — the approach depends on internal or external, tooth form, fit, shaft geometry, material and quantity.
Involute and straight-sided splines in both configurations, with the specified form and fit read correctly from your drawing.
Involute splines to your dimensions, tooth geometry, fit and specification, backed by our spline and serration reference data.
Spline shafting on our hobbing equipment, up to 36″ long, with additional shaft machining as required.
Deburring, chamfering, heat treatment coordination, metal finishing and spline fit inspection.
Spline shafts up to 36″
Internal and external splines usually run as mating parts, so we read the specified form and fit from your drawing before we cut. Our hobbing equipment is set up for spline shafting as well as spur, helical and worm gearing.
Shafts up to 36″ long
Involute & straight-sided forms
SAE & metric DIN 5481
Spline fit
O.D. fit and side fit locate mating splines in different ways. Read the drawing the wrong way and the parts may assemble but fail early in service — so fit is the first thing we confirm.
What we confirm from your drawing:
Which part carries the spline, and its mating component.
Involute or straight-sided, teeth, pitch and pressure angle.
O.D. fit or side fit, and the specified fit class.
ANSI B92.1, DIN 5480, SAE or DIN 5481 serrations.
CNC machining
Spline generation and component machining coordinated as one project.
Shaft diameters, shoulders and journals turned to size.
Flats, slots and milled features to the drawing.
Complete spline shafts machined around the spline.
Bores for internal spline hubs and couplings.
Keyways cut to your specification.
Holes and other customer-specified features.
Finishing & secondary operations
Outside sources for heat treatment and metal finishing when your part requires it.
Burrs removed from spline teeth and machined features.
Spline ends chamfered for clean assembly.
Specified heat treatment sourced and coordinated.
Finishes applied as your drawing requires.
Critical dimensions verified to the drawing.
Fit checked with gauges or mating parts.
Prototype to production
Prototype splines and spline shafts for new designs.
Worn or failed spline shafts reproduced.
Hubs, couplings and shafts as matched components.
Short runs through production-volume OEM orders.
Splines for industrial power transmission
Custom splines and spline shafts transmit torque between a shaft and a mating component while holding the required fit and alignment.
Torque carried between shafts, hubs and couplings.
Internal and external splines for drive connections.
Splines that allow axial movement under load.
Worn or failed spline shafts reproduced correctly.
Industries we serve
Spline shafts and hubs for construction equipment.
Heavy-duty splines, including a documented mining shaft fix.
Precision splines for machine tool builders.
Splined components for rail and transit equipment.
Custom splines manufactured for defense suppliers.
Splines and spline shafts built to OEM drawings.
Fine splines for medical equipment manufacturers.
Compact splined parts for power hand tools.
Spline components for mass transit equipment.
Spline quality, fit and inspection
Spline inspection has to confirm both the manufactured geometry and the fit between mating parts. We use calibrated equipment and documented procedures for straight-sided and involute splines.
Straight-sided spline root diameter measured.
Tooth thickness checked against the drawing.
Runout checked with an indicator or a pin.
Involute spline size measured over pins.
Fit verified with spline gauges.
Fit checked with the mating component to the specified class.
Tooth elements verified when your drawing or PO requires.
The specified fit confirmed from the drawing before production.
Case study · mining equipment
01
A mining equipment builder was seeing spline shafts fail early in service.
02
From sample parts and drawings we found the previous supplier had made side-fit splines when the drawing called for O.D. fit.
03
We built a quality plan around the correct spline requirements and were awarded the manufacturing contract.
Custom spline manufacturer since 1946
Specialized spline equipment, CNC machining, documented inspection and decades of power-transmission experience.
Involute and straight-sided, O.D.-fit and side-fit, SAE and metric serrations.
Internal or external splines and spline shafts up to 36 inches long.
Spline generation with turning, milling, shaft machining and finishing.
Single prototypes, replacements, short runs and production volumes.
Documented spline procedures and 120+ years of combined experience.
Custom spline quotes
Send us your drawing, specifications, quantity and application. We will review your spline configuration and plan the right manufacturing and inspection approach — a detailed print gets you a faster, more accurate quote.
Custom spline manufacturing FAQ
Yes. We manufacture internal and external splines, involute and straight-sided, to your drawings, fit requirements and specifications.
Internal and external involute splines, straight-sided splines, spline shafts, O.D.-fit and side-fit splines, and SAE and metric serrations.
We manufacture internal or external splines and spline shafts up to 36 inches long.
They are two different ways of locating and fitting mating splines. The required fit must be specified on the drawing — we have fixed a mining application where a side-fit interpretation of an O.D.-fit drawing caused premature shaft failure.
American National Standard involute splines (ANSI B92.1), metric DIN 5480, SAE and metric DIN 5481 serrations, and straight-sided spline sizes and fits. Your drawing and specified standard govern each project.
Yes. We support single prototypes, short runs and long-run production orders.
Straight-sided splines are checked for root diameter, tooth thickness, runout and fit. Involute splines are checked over pins, for runout, and for fit with gauges or mating parts to the specified class.
A drawing or CAD file, spline type, internal or external, teeth, pitch or module, fit, applicable standard, material, dimensions, quantity, mating-part information, tolerances, inspection, secondary processes and delivery timeline.
