{"id":1004,"date":"2026-04-29T08:53:58","date_gmt":"2026-04-29T08:53:58","guid":{"rendered":"https:\/\/splined-shaft.net\/product\/telescopic-sliding-splined-shafts\/"},"modified":"2026-04-29T08:53:58","modified_gmt":"2026-04-29T08:53:58","slug":"telescopic-sliding-splined-shafts","status":"publish","type":"product","link":"https:\/\/splined-shaft.net\/nn\/product\/telescopic-sliding-splined-shafts\/","title":{"rendered":"Telescopic \/ Sliding Splined Shafts"},"content":{"rendered":"
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Variable-Length Power Transmission<\/div>\n

Telescopic \/ Sliding
Splined Shafts<\/span><\/h2>\n

Engineered for axial sliding while transmitting torque \u2014 driving PTO shafts, suspension articulation, telescopic steering columns and adaptive driveline geometry across Australia’s agricultural, automotive and heavy-vehicle sectors.<\/p>\n<\/div>\n

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\"Telescopic<\/td>\n\"Sliding<\/td>\n<\/tr>\n<\/table>\n

Few driveline components solve as many design problems at once as the telescopic splined shaft. By engaging an external (male) splined member with a matched internal (female) sleeve, the assembly transmits full rated torque while still permitting axial extension or retraction \u2014 accommodating thermal growth, suspension travel, articulation between tractor and implement, or service-friendly disassembly without disturbing surrounding components.<\/p>\n

Ever-power has produced telescopic and sliding splined shaft assemblies for the Australian market for over 22 years, supporting agricultural OEMs across the Riverina, automotive driveshaft rebuilders in Adelaide, and heavy-vehicle manufacturers in Brisbane and Perth. Custom envelope, custom stroke, custom torque rating \u2014 drawn, built and inspected to your specification.<\/p>\n

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Section One<\/div>\n

Where Telescopic Splines Earn Their Keep<\/h2>\n\n\n\n
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Length Variation Without Decoupling<\/h3>\n

When the angular alignment between two driven components varies during operation \u2014 tractor drawbar pivot, semi-trailer fifth wheel, IFS suspension travel \u2014 a telescopic spline absorbs the length change without breaking the torque path.<\/p>\n<\/td>\n

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Service & Assembly Convenience<\/h3>\n

Compressing the telescopic section allows the shaft to be fitted between two pre-installed flanges, eliminating the need to disturb engines, gearboxes or final drives during installation or replacement.<\/p>\n<\/td>\n<\/tr>\n

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Tolerance & Stack-Up Absorption<\/h3>\n

Manufacturing variation in chassis length, gearbox mounting position and axle location accumulates to \u00b110 mm or more \u2014 easily absorbed by a sliding spline while a fixed-length shaft would bind or pre-load the bearings.<\/p>\n<\/td>\n

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Vibration & Thermal Management<\/h3>\n

Hardened spline interfaces under controlled clearance damp resonance and accommodate thermal expansion of long shaft runs \u2014 a 3-metre steel driveshaft grows roughly 1.4 mm per 40 \u00b0C temperature swing.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Section Two<\/div>\n

Specification Range<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nStandard Range<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Spline Profile<\/td>\nInvolute \/ parallel-side \/ triangular<\/td>\nDIN 5480 \/ DIN 5463 \/ SAE J498 \u2014 drawing-driven<\/td>\n<\/tr>\n
Outer Diameter<\/td>\n\u00d820 mm \u2013 \u00d8180 mm<\/td>\nLarger sizes available on enquiry<\/td>\n<\/tr>\n
Collapsed Length<\/td>\n300 mm \u2013 2400 mm<\/td>\nCustomer-specified per chassis envelope<\/td>\n<\/tr>\n
Stroke \/ Plunge<\/td>\n50 mm \u2013 600 mm<\/td>\nSized to allowed length variation plus 25% margin<\/td>\n<\/tr>\n
Material<\/td>\n42CrMo4 \/ 4140 \/ 20MnCr5<\/td>\nThrough-hardened or case-carburised<\/td>\n<\/tr>\n
Spline Hardness<\/td>\n52 \u2013 58 HRC (induction)<\/td>\nCase carburised 58 \u2013 62 HRC, 0.8 \u2013 1.5 mm CHD<\/td>\n<\/tr>\n
Sliding Coating<\/td>\nPTFE \/ phosphate \/ nylon<\/td>\nReduces sliding friction by up to 70% under load<\/td>\n<\/tr>\n
Backlash<\/td>\n0.05 \u2013 0.20 mm circumferential<\/td>\nTighter classes available with selective fit<\/td>\n<\/tr>\n
Torque Rating<\/td>\nUp to 18,000 N\u00b7m<\/td>\nDependent on diameter, profile and material spec<\/td>\n<\/tr>\n
Sealing<\/td>\nNitrile \/ Viton boot or wiper seal<\/td>\nIP65 dust and water resistance achievable<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Section Three<\/div>\n

Manufacturing Workflow<\/h2>\n\n\n\n\n
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01<\/span><\/p>\n

Forging & Normalising<\/h3>\n<\/div>\n

Bar stock cut to length and upset-forged where stepped diameters reduce machining waste. Normalising at 870 \u00b0C produces uniform pearlite-ferrite grain structure prior to spline cutting.<\/p>\n<\/td>\n

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02<\/span><\/p>\n

Spline Hobbing or Rolling<\/h3>\n<\/div>\n

External splines hobbed on Liebherr or Mitsubishi machines for short runs, cold-rolled on two-die rotary mills for high-volume automotive batches \u2014 gaining 30% fatigue improvement.<\/p>\n<\/td>\n<\/tr>\n

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03<\/span><\/p>\n

Female Spline Broaching<\/h3>\n<\/div>\n

Internal sleeve splines broached on horizontal machines, achieving DIN 5480 quality 8h or 9h fit class. Push-broaching for short engagement, pull-broaching for through-bored sleeves.<\/p>\n<\/td>\n

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04<\/span><\/p>\n

Induction Hardening<\/h3>\n<\/div>\n

Spline flanks selectively induction-hardened to 52\u201358 HRC to a controlled depth of 2.0\u20133.5 mm, leaving the core tough at 28\u201332 HRC for impact resistance.<\/p>\n<\/td>\n<\/tr>\n

\n
05<\/span><\/p>\n

Friction Coating<\/h3>\n<\/div>\n

PTFE-impregnated nylon coating sprayed and cured on female spline ID, or manganese phosphate dip on male flanks \u2014 selected against duty-cycle, sliding speed and ambient contamination.<\/p>\n<\/td>\n

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06<\/span><\/p>\n

Functional Test & Pack<\/h3>\n<\/div>\n

Each assembly tested for sliding torque (typically < 25 N\u00b7m at 50 N\u00b7m transmitted load), static breakaway, and rotational backlash before VCI bagging and crating.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n\n\n
\"Telescopic<\/td>\n<\/tr>\n<\/table>\n
Section Four<\/div>\n

Application Domains<\/h2>\n\n\n\n
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<\/div>\n

Agricultural PTO Drives<\/h3>\n

Standard 540 \/ 1000 RPM tractor PTO shafts for balers, harvesters, slurry tankers and rotary cutters. Lemon, triangular and 6-spline interfaces per ISO 500 and ASABE standards.<\/p>\n<\/td>\n

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<\/div>\n

Heavy Vehicle Driveshafts<\/h3>\n

Slip-yoke driveshafts for 4\u00d74, 6\u00d76 and 8\u00d78 trucks \u2014 accommodating up to \u00b1100 mm suspension articulation while transmitting up to 12,000 N\u00b7m peak torque to differential.<\/p>\n<\/td>\n

\n
\ufe0f<\/div>\n

Construction Equipment<\/h3>\n

Articulated dump trucks, motor graders, telehandlers and concrete pump trucks \u2014 telescoping driveshafts compensate for chassis pivot motion and fully loaded ride-height changes.<\/p>\n<\/td>\n<\/tr>\n

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<\/div>\n

Steering Columns<\/h3>\n

Tilt-and-telescope automotive steering columns absorb crash energy through controlled spline collapse \u2014 qualified to ECE R12 and ANCAP frontal-impact protocols.<\/p>\n<\/td>\n

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\u26cf\ufe0f<\/div>\n

Mining Equipment<\/h3>\n

Continuous miners, longwall shearers and load-haul-dump units \u2014 rugged telescoping shafts survive Pilbara and Hunter Valley duty cycles with case-carburised splines.<\/p>\n<\/td>\n

\n
\ufe0f<\/div>\n

Industrial Driveshafts<\/h3>\n

Conveyor drives, pump shafts, marine propulsion and cooling-tower fan drives \u2014 bridging misaligned bearings without imposing parasitic axial loads.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

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Section Five<\/div>\n

Why Choose Ever-power<\/h2>\n\n\n\n\n
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\u2192 Single-Source Capability<\/h3>\n

Forge bar, hob splines, broach female sleeves, induction harden, coat and assemble \u2014 every step under one quality system, eliminating finger-pointing between sub-suppliers.<\/p>\n<\/td>\n

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\u2192 22 Years, 38 Countries<\/h3>\n

Established 2003. Over 1.6 million spline assemblies shipped, including more than 280,000 telescopic units to agricultural, automotive and heavy-vehicle clients worldwide.<\/p>\n<\/td>\n<\/tr>\n

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\u2192 IATF 16949 & ISO 9001 Certified<\/h3>\n

Automotive-grade quality system, EN 10204 3.1 mill test certificate, dimensional CMM report, hardness curve and PPAP\/FAIR available on request \u2014 full traceability to heat number.<\/p>\n<\/td>\n

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\u2192 Defect Rate < 250 PPM<\/h3>\n

Three-year rolling average across telescopic shaft production. Each assembly is functionally tested for sliding torque, breakaway and backlash before packaging.<\/p>\n<\/td>\n<\/tr>\n

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\u2192 Australian Logistics Support<\/h3>\n

ChAFTA Form for duty exemption issued with every shipment. FCL and LCL ocean freight to Sydney, Melbourne, Brisbane, Adelaide and Fremantle. DDP option available.<\/p>\n<\/td>\n

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\u2192 Standard Lead Time 25\u201335 Days<\/h3>\n

Production windows reserved monthly for repeat customers. Expedited 18-day production available for line-down emergencies subject to capacity.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n<\/div>\n\n\n
\"Ever-power<\/td>\n<\/tr>\n<\/table>\n
Section Six<\/div>\n

Australian Project Case Studies<\/h2>\n\n\n
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Riverina, NSW \u00b7 Agricultural Implements<\/div>\n
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Round Baler PTO Shafts \u2014 1,200 Units<\/h3>\n

A Riverina agricultural implement manufacturer building large-square balers for export to South-East Asia approached Ever-power after their existing supplier struggled with PTO shaft delivery and field-failure complaints. The specification called for ASABE Category 6 1-3\/4 inch 20-spline interface, 540 RPM continuous, 1,800 N\u00b7m peak torque, with 350 mm telescopic stroke.<\/p>\n

Ever-power supplied 1,200 units across the 2025 production season \u2014 42CrMo4 induction hardened, manganese phosphate coated, fitted with overload friction clutch interface. Field returns dropped to under 0.3% within the first 12 months.<\/p>\n

Outcome: Field failure rate cut by 80%, supplier relationship continued into 2026 model year.<\/div>\n<\/div>\n<\/td>\n

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Adelaide, SA \u00b7 Heavy Vehicle Driveline<\/div>\n
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Mining Truck Slip-Yoke Driveshafts<\/h3>\n

An Adelaide-based heavy-vehicle driveshaft remanufacturer servicing mining fleets across South Australia and the Northern Territory specified \u00d875 mm 16-tooth involute slip yokes with 200 mm stroke and 12,000 N\u00b7m torque rating, suitable for 80-tonne haul truck operation in 50 \u00b0C ambient conditions.<\/p>\n

Ever-power case-carburised the male splines to 60 HRC at 1.2 mm CHD, broached the matching female yoke to ISO 8h and supplied 480 paired sets over 18 months, with full PPAP documentation and individual-serial traceability.<\/p>\n

Outcome: Mean time between failures lifted from 4,800 to 7,200 operating hours.<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/table>\n
Section Seven<\/div>\n

Frequently Asked Questions<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
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How do I size the telescopic stroke for my application?<\/h3>\n

Calculate the maximum length variation between the two driven flanges through the full operating envelope (suspension travel, articulation angle, thermal growth) and add 25% as a safety margin. Provide both collapsed and extended length on the drawing \u2014 we confirm spline engagement length remains adequate at maximum extension.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/tr>\n
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What sliding torque can I expect under load?<\/h3>\n

A typical \u00d850 mm involute spline transmitting 500 N\u00b7m torque shows 15\u201335 N\u00b7m axial sliding force depending on coating and lubrication. PTFE-impregnated nylon coating reduces sliding force by approximately 60\u201370% versus uncoated steel-on-steel and is recommended whenever the shaft slides under load.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/tr>\n
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Can you supply telescopic shafts to ISO 500 PTO standards?<\/h3>\n

Yes. We routinely supply ISO 500 Type 1 (1-3\/8 inch 6-spline), Type 2 (1-3\/8 inch 21-spline), Type 3 (1-3\/4 inch 20-spline) and the 8-spline metric variants. Overload clutch interfaces, shear-bolt, ratchet and friction-disc options are available.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/tr>\n
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What sealing options prevent contamination ingress?<\/h3>\n

Convoluted nitrile or Viton boots provide IP54 protection for indoor industrial use. For outdoor and off-highway applications a wiper seal at the sleeve mouth combined with a vented end-cap reaches IP65. Lubricated for life with NLGI 2 EP grease unless specified otherwise.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/tr>\n
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Do you balance assembled telescopic shafts?<\/h3>\n

Yes. Driveshaft assemblies operating above 2,500 RPM are dynamically two-plane balanced to ISO 1940 G6.3 or G2.5 grade depending on application. Balance certificates issued per individual serial number for automotive and heavy-vehicle use.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/tr>\n
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What is the typical lead time and minimum order quantity?<\/h3>\n

Standard production lead time is 25\u201335 working days from drawing approval. MOQ is 50 units for catalogue sizes, 200 units for fully custom designs. Expedited 18-day production available subject to material availability and capacity confirmation.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/tr>\n
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Can you reverse-engineer existing telescopic shafts?<\/h3>\n

Yes. Send a sample to our Australian sales contact and we will measure spline geometry, hardness profile, surface coating and overall envelope dimensions, then issue a manufacturing drawing for your approval before tooling. Typical reverse-engineering cycle is 10\u201314 working days.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

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Get In Touch<\/div>\n

Send Us Your Drawing or Sample<\/h2>\n

Our engineering team responds to every Australian enquiry within one business day. Quotations include budgetary pricing, indicative lead time, recommended material grade and DFM feedback before you commit to tooling.<\/p>\n

sales@splined-shaft.net<\/a>Contact Form<\/a>About Ever-power<\/a><\/div>\n

Browse the complete spline shaft catalogue from the Ever-power home page<\/a>.<\/p>\n<\/div>\n<\/div>\n