{"id":1000,"date":"2026-04-29T08:53:55","date_gmt":"2026-04-29T08:53:55","guid":{"rendered":"https:\/\/splined-shaft.net\/product\/parallel-straight-sided-splined-shafts\/"},"modified":"2026-04-29T08:53:56","modified_gmt":"2026-04-29T08:53:56","slug":"parallel-straight-sided-splined-shafts","status":"publish","type":"product","link":"https:\/\/splined-shaft.net\/uk\/product\/parallel-straight-sided-splined-shafts\/","title":{"rendered":"Parallel \/ Straight-Sided Splined Shafts"},"content":{"rendered":"
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Parallel \/ Straight-Sided Splined Shafts<\/h2>\n

Heavy-Duty Power Transmission Built for Australian Workshops<\/p>\n<\/div>\n

Parallel splined shafts \u2013 sometimes called square or straight-sided splines \u2013 remain the working horse of agricultural drivelines, truck PTOs, mining gearboxes and heavy machinery built or rebuilt across Australia. Their flat, parallel-flank tooth geometry handles high static torque and shock loads where involute profiles can be overkill or cost-prohibitive.<\/p>\n

Ever-power produces parallel splined shafts to GB\/T 1144, DIN 5463 (light series), DIN 5471 (medium series), DIN 5472 (heavy series), ISO 14 and SAE J500\/J501 specifications, supplied with full traceability and Australian-friendly INCOTERMS to your dock.<\/p>\n\n\n
\"Parallel<\/td>\n\"Heavy-duty<\/td>\n<\/tr>\n<\/table>\n

Three Series, One Reliable Source<\/h2>\n
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Series<\/th>\nDIN Standard<\/th>\nTypical Application<\/th>\nTooth Count<\/th>\nDiameter Range<\/th>\n<\/tr>\n<\/thead>\n
Light Duty<\/td>\nDIN 5463<\/td>\nMachine tools, light gearboxes, conveyor drives<\/td>\n6, 8, 10<\/td>\n\u00d811 \u2013 \u00d8112 mm<\/td>\n<\/tr>\n
Medium Duty<\/td>\nDIN 5471<\/td>\nTruck transmissions, light agricultural machinery<\/td>\n6, 8, 10<\/td>\n\u00d813 \u2013 \u00d8125 mm<\/td>\n<\/tr>\n
Heavy Duty<\/td>\nDIN 5472<\/td>\nMining drives, heavy trucks, large reduction gearboxes<\/td>\n10, 16, 20<\/td>\n\u00d818 \u2013 \u00d8125 mm<\/td>\n<\/tr>\n
PTO Series<\/td>\nSAE J500\/J501, ASAE S203<\/td>\nTractor PTO, agricultural implement drives<\/td>\n6, 8, 21<\/td>\n1-3\/8″, 1-3\/4″, 2-1\/4″<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Construction Advantages of Straight-Sided Splines<\/h2>\n\n\n\n
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Simple, Robust Geometry<\/h3>\n

Flat parallel flanks distribute torque uniformly across the contact area. The geometry is forgiving of minor misalignment and tolerates abrasive working environments where dust and dirt are unavoidable.<\/p>\n<\/td>\n

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Lower Tooling Cost<\/h3>\n

Straight-sided splines can be produced by milling, broaching or shaping with simpler tooling than involute hobbing, lowering the unit cost on small to medium production runs by up to 22 percent.<\/p>\n<\/td>\n

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High Static Torque<\/h3>\n

For applications where the connection is mostly static or low-cycle (PTO yokes, fitter-removable couplings), the parallel profile carries significantly higher peak loads per unit shaft diameter.<\/p>\n<\/td>\n<\/tr>\n

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Field-Serviceable<\/h3>\n

Bush mechanics across remote Australia value parallel splines for their tolerance of repeat assembly and disassembly without the careful handling involute profiles demand.<\/p>\n<\/td>\n

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Three Centring Methods<\/h3>\n

Side fit (most common), major diameter fit (highest concentricity), or minor diameter fit \u2013 we machine to the centring method that suits your shaft-hub system without compromise.<\/p>\n<\/td>\n

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Backwards Compatible<\/h3>\n

When restoring vintage or imported equipment, parallel splines remain the dominant choice for matching existing hubs without redesigning the whole assembly.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

Detailed Manufacturing Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Manufacturing Parameter<\/th>\nCapability at Ever-power<\/th>\n<\/tr>\n<\/thead>\n
Production methods<\/td>\nHobbing, milling, broaching, shaping, CNC turning<\/td>\n<\/tr>\n
Tooth count standard<\/td>\n4, 6, 8, 10, 16, 20 (custom on request)<\/td>\n<\/tr>\n
Centring method<\/td>\nSide fit \/ major diameter fit \/ minor diameter fit<\/td>\n<\/tr>\n
Outer diameter<\/td>\n\u00d811 mm to \u00d8250 mm<\/td>\n<\/tr>\n
Total length<\/td>\nUp to 4,500 mm<\/td>\n<\/tr>\n
Materials<\/td>\n1045, 4140, 4340, 42CrMo4, 20CrMnTi, 17CrNiMo6, 8620<\/td>\n<\/tr>\n
Surface hardness<\/td>\nHRC 28\u201335 (Q&T) \/ HRC 55\u201362 (case hardened)<\/td>\n<\/tr>\n
Tolerance grade<\/td>\nIT6 to IT9 on spline width<\/td>\n<\/tr>\n
Surface finish<\/td>\nRa 0.8 to Ra 3.2 \u00b5m<\/td>\n<\/tr>\n
Surface treatment<\/td>\nBlack oxide, manganese phosphate, zinc plating, Dacromet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Australian Industries We Serve<\/h2>\n\n\n\n
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Agriculture<\/h3>\n

Tractor PTO yokes, balers, headers, slashers<\/p>\n<\/td>\n

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<\/div>\n

Heavy Trucks<\/h3>\n

Transfer cases, transmission output shafts, propshafts<\/p>\n<\/td>\n

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\u26cf\ufe0f<\/div>\n

Mining<\/h3>\n

Conveyor drives, drilling rigs, screening equipment<\/p>\n<\/td>\n

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<\/div>\n

Heavy Industry<\/h3>\n

Steel mills, cement plants, paper machinery<\/p>\n<\/td>\n<\/tr>\n

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Marine<\/h3>\n

Winch drives, deck machinery, fishing trawlers<\/p>\n<\/td>\n

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\ufe0f<\/div>\n

Machine Tools<\/h3>\n

Lathe spindles, milling machine drives<\/p>\n<\/td>\n

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\ufe0f<\/div>\n

Oil & Gas<\/h3>\n

Mud pumps, top drives, workover rigs<\/p>\n<\/td>\n

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\u267b\ufe0f<\/div>\n

Waste & Recycling<\/h3>\n

Shredder shafts, baler drives, compactor PTOs<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

Inside the Ever-power Production Floor<\/h2>\n\n\n
\"Ever-power<\/td>\n\"CNC<\/td>\n<\/tr>\n<\/table>\n

Our 18,000 m\u00b2 production hall houses 28 CNC turning centres, 12 hobbing machines, 6 spline broaching presses, 4 induction hardening lines and a sealed-quench carburising furnace. Every parallel splined shaft batch is logged in our MES system from raw bar coding to final inspection, giving Australian buyers full traceability to the original heat number.<\/p>\n

Why Australian Sourcing Managers Choose Ever-power<\/h2>\n
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01<\/td>\n\n

No-Drama Lead Time<\/h3>\n

25\u201335 days standard, 18 days expedited for repeat customers. We commit dates in writing and ship on the date we promised, full stop.<\/p>\n<\/td>\n<\/tr>\n

02<\/td>\n\n

Pricing You Can Defend<\/h3>\n

Our parallel splined shafts typically land in Sydney or Melbourne at 30\u201348 percent below comparable European stock with the same metallurgical specification.<\/p>\n<\/td>\n<\/tr>\n

03<\/td>\n\n

Direct Engineer-to-Engineer Communication<\/h3>\n

Speak directly with our spline application engineers, not a sales rep. Drawing reviews, DFM feedback and material substitution proposals usually return within one Australian working day.<\/p>\n<\/td>\n<\/tr>\n

04<\/td>\n\n

Quality Documentation Included<\/h3>\n

Material certificate, dimensional report, hardness test, surface finish measurement, and visual inspection \u2013 all bundled with every shipment at no surcharge.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Australian Project Snapshots<\/h2>\n\n\n
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Riverina Tractor PTO Yoke Replacement Programme<\/h3>\n

A NSW agricultural distributor sourcing PTO yokes for cotton harvest equipment moved their entire 1-3\/8″ 6-spline yoke supply to Ever-power. Across 12 months and 8,400 units, field-failure rate stayed below 0.07 percent compared to 1.1 percent with the previous supplier.<\/p>\n

Standard: ASAE S203 | Material: 4140 induction hardened HRC 52<\/p>\n<\/td>\n

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Hunter Valley Coal Conveyor Drive Shafts<\/h3>\n

An NSW maintenance contractor specified Ever-power 10-tooth DIN 5472 heavy-series shafts in 17CrNiMo6 for replacement in a 2.4 km overland coal conveyor. Eighteen months on, the shafts continue running 24\/6 with no measurable wear at the spline interface.<\/p>\n

Standard: DIN 5472 10\u00d772\u00d782 | Hardness: HRC 60 case, HRC 32 core<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

Frequently Asked Questions<\/h2>\n
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When should I choose parallel splines over involute?<\/h3>\n

Pick parallel straight-sided splines when peak static torque is the dominant load, when cost matters more than absolute precision, or when the design must match an existing hub. For high-cycle, high-precision applications, involute splines are usually the better choice.<\/p>\n<\/div>\n

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Which centring method should I specify?<\/h3>\n

Side fit is the default for most general-purpose drives. Major diameter fit gives the highest concentricity and is preferred for high-speed shafts. Minor diameter fit suits ground bores. If unsure, send us your application data and we will recommend.<\/p>\n<\/div>\n

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Can you produce SAE 1-3\/8″ 6-spline PTO shafts?<\/h3>\n

Yes \u2013 this is one of our highest-volume product lines for the Australian market. We also produce 1-3\/4″ 20-spline, 1-3\/4″ 6-spline and 2-1\/4″ 21-spline PTO shafts to ASAE S203 with quick-disconnect grooves and snap-ring grooves.<\/p>\n<\/div>\n

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What is the typical lead time on a 500-piece run?<\/h3>\n

For a 500-piece order in stock material grades (1045, 4140, 42CrMo4) with side-fit centring and standard heat treatment, expect 28 working days from drawing approval. Longer if drop-forging blanks are required.<\/p>\n<\/div>\n

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Do you provide a CAD model with the quotation?<\/h3>\n

Yes. STEP and Parasolid models are issued for engineering approval before machining. We also provide 2D PDF drawings with full GD&T callouts, hardness zones and inspection requirements.<\/p>\n<\/div>\n

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Are your parallel splined shafts compatible with European-made hubs?<\/h3>\n

Yes, provided we have either the original drawing or a clean sample of the hub. We routinely manufacture replacement shafts for John Deere, Case IH, New Holland, Massey Ferguson, ZF, Funk and SAME-derived equipment.<\/p>\n<\/div>\n<\/div>\n

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Get Your Parallel Splined Shaft Quote<\/h2>\n

Send your drawing, sample or sketch and we will respond inside one Australian business day with pricing, lead time and material recommendations.<\/p>\n

Email sales@splined-shaft.net<\/a>Submit Enquiry Form<\/a>Why Ever-power<\/a><\/div>\n

Browse the full splined shaft catalogue<\/a> on our homepage.<\/p>\n<\/div>\n