{"id":3393,"date":"2026-06-25T05:56:09","date_gmt":"2026-06-25T05:56:09","guid":{"rendered":"https:\/\/www.pto-drive-shafts.com\/?post_type=product&p=3393"},"modified":"2026-06-25T06:16:27","modified_gmt":"2026-06-25T06:16:27","slug":"ratchet-torque-limiter","status":"publish","type":"product","link":"https:\/\/www.pto-drive-shafts.com\/el\/%cf%80%cf%81%ce%bf%cf%8a%cf%8c%ce%bd\/ratchet-torque-limiter\/","title":{"rendered":"Ratchet Torque Limiter"},"content":{"rendered":"
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PTO Drive Shafts \u00b7 UK Industrial Supplier<\/div>\n

Ratchet Torque Limiter<\/h2>\n

Precision overload protection engineered for UK agricultural and industrial drive systems. Ratchet torque limiters that disengage instantly at your pre-set torque threshold \u2014 keeping your machinery, operators, and gearboxes safe.<\/p>\n

\ud83d\udd52 Get a Quote Now<\/a><\/p>\n<\/div>\n<\/div>\n

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\"RatchetThe ratchet torque limiter is a mechanical safety device designed to protect PTO-driven equipment from sudden torque spikes and overload conditions. When the transmitted torque exceeds a pre-set value, the ratchet mechanism disengages the drive, preventing expensive damage to gearboxes, pumps, and implements. Once the overload clears, the limiter automatically re-engages without manual intervention \u2014 a critical advantage in high-throughput agricultural environments across the UK where downtime directly affects seasonal output.<\/p>\n

Our ratchet torque limiters are built to withstand the demanding cycles of British farming and light industrial use, covering tractors, combine harvesters, slurry tankers, fertiliser spreaders, and a wide range of stationary PTO-driven processing machinery. With setting torques ranging from 400 Nm to 1600 Nm and compatibility with standard 1 3\/8″ Z6 splines, these units integrate seamlessly with most European and UK-market tractor outputs.<\/p>\n<\/div>\n<\/div>\n

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How the Ratchet Torque Limiter Works<\/h2>\n
<\/div>\n

\"RatchetInside each ratchet torque limiter, a set of spring-loaded pawls engage with a precision-machined hub. During normal operation, the pawls lock into the hub teeth and transfer drive torque cleanly from the PTO shaft yoke to the implement. When transmitted torque climbs above the factory-set threshold \u2014 caused by impact loads, blockages, or sudden mechanical shock \u2014 the pawls are forced out of engagement by the ramp geometry of the hub teeth. This ratcheting action produces an audible clicking sound, which also serves as a diagnostic alert for the operator. The PTO shaft continues to turn, but the implement side is effectively decoupled until the overload condition is resolved. The entire disengage-and-re-engage cycle happens within fractions of a second, with no springs to replace and no manual reset lever to pull.<\/p>\n

The pawl quantity varies by series \u2014 8, 16, 24, or 32 pawls \u2014 directly influencing the smoothness of engagement and the granularity of the torque setting. Higher pawl counts deliver finer torque gradations and smoother re-engagement, making the SA3 and SA4 series preferred in UK dairy and arable operations where consistent, low-shock drive characteristics are valued. The housing with integrated yoke is manufactured from forged steel, and each unit is greased via a standard nipple to maintain long-term performance.<\/p>\n<\/div>\n

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Why UK Engineers Specify Our Ratchet Torque Limiter<\/h2>\n
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\u26a1<\/div>\n

Instant Automatic Re-Engagement<\/h3>\n

No manual reset required. Once the overload clears, the ratchet re-engages within a single shaft revolution, minimising downtime and keeping headland turns productive.<\/p>\n<\/div>\n

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\ud83d\udee0<\/div>\n

Wide Torque Range: 400\u20131600 Nm<\/h3>\n

Four SA series grades cover compact utility tractors right through to high-horsepower arable units, giving UK dealers a single-supplier solution for their entire machine range.<\/p>\n<\/div>\n

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\ud83c\udfed<\/div>\n

Forged Steel Construction<\/h3>\n

The housing, hub, and yoke are forged from high-strength steel. Surface hardening of the pawl contact faces extends working life even under continuous duty cycles in UK field conditions.<\/p>\n<\/div>\n

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\ud83c\udf1f<\/div>\n

Standard Spline Compatibility<\/h3>\n

All series use the 1 3\/8″ Z6 spline interface, the UK and European agricultural industry standard, ensuring plug-and-play fitment without adapter components.<\/p>\n<\/div>\n

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\ud83d\udd12<\/div>\n

Dust Guard & Sealed Bearing Kit<\/h3>\n

Integrated dust guard rings and ball collar kits seal internal components from ingress of crop debris, slurry, and moisture \u2014 critical for UK autumn drilling and winter feeding operations.<\/p>\n<\/div>\n

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Factory-Set Torque Accuracy<\/h3>\n

Each unit is calibrated and tested before shipment. Torque settings are precise to within \u00b15%, giving machinery designers reliable overload protection without field recalibration.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specifications<\/h2>\n
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All dimensional data is supplied directly from engineering drawings. Tables are reproduced in full below. Torque values are in Newton-metres (Nm); dimensions A and B are in millimetres (mm).<\/p>\n

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\u25b6 SA1 Series \u2014 Setting Torque: 400 Nm<\/h3>\n

\"SA1<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
No.<\/th>\n\u03a0\u03b5\u03c1\u03b9\u03b3\u03c1\u03b1\u03c6\u03ae<\/th>\n\u03a3\u03b7\u03bc\u03b5\u03b9\u03ce\u03c3\u03b5\u03b9\u03c2<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nCirclip<\/td>\n<\/td>\n<\/tr>\n
2<\/td>\nRetaining washer<\/td>\n<\/td>\n<\/tr>\n
3<\/td>\nDust guard ring<\/td>\n<\/td>\n<\/tr>\n
4<\/td>\nBall collar kit<\/td>\n<\/td>\n<\/tr>\n
5<\/td>\nHub<\/td>\n<\/td>\n<\/tr>\n
6<\/td>\nPawl kit<\/td>\nQty.=32<\/td>\n<\/tr>\n
7<\/td>\nHousing with yoke<\/td>\n<\/td>\n<\/tr>\n
8<\/td>\nGrease nipple<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"SA1<\/p>\n<\/div>\n

<\/p>\n

\n\n\n\n\n\n\n\n\n
\u03a3\u03b5\u03b9\u03c1\u03ac<\/th>\nSetting Torque (Nm)<\/th>\n\u03a3\u03c0\u03bb\u03ac\u03b9\u03bd<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\n<\/tr>\n<\/thead>\n
1SA1<\/td>\n400<\/td>\n1 3\/8″ Z6<\/td>\n138<\/td>\n21<\/td>\n<\/tr>\n
2SA1<\/td>\n400<\/td>\n1 3\/8″ Z6<\/td>\n138<\/td>\n21<\/td>\n<\/tr>\n
3SA1<\/td>\n400<\/td>\n1 3\/8″ Z6<\/td>\n149<\/td>\n21<\/td>\n<\/tr>\n
4SA1<\/td>\n400<\/td>\n1 3\/8″ Z6<\/td>\n150<\/td>\n21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

<\/p>\n

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\u25b6 SA2 Series \u2014 Setting Torque: 800 Nm<\/h3>\n

\"SA2<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
No.<\/th>\n\u03a0\u03b5\u03c1\u03b9\u03b3\u03c1\u03b1\u03c6\u03ae<\/th>\n\u03a3\u03b7\u03bc\u03b5\u03b9\u03ce\u03c3\u03b5\u03b9\u03c2<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nCirclip<\/td>\n<\/td>\n<\/tr>\n
2<\/td>\nRetaining washer<\/td>\n<\/td>\n<\/tr>\n
3<\/td>\nDust guard ring<\/td>\n<\/td>\n<\/tr>\n
4<\/td>\nPush pin kit<\/td>\n<\/td>\n<\/tr>\n
5<\/td>\nHub<\/td>\n<\/td>\n<\/tr>\n
6<\/td>\nPawl kit<\/td>\nQty.=8<\/td>\n<\/tr>\n
7<\/td>\nHousing with yoke<\/td>\n<\/td>\n<\/tr>\n
8<\/td>\nGrease nipple<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

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\"SA2<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u03a3\u03b5\u03b9\u03c1\u03ac<\/th>\nSetting Torque (Nm)<\/th>\n\u03a3\u03c0\u03bb\u03ac\u03b9\u03bd<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\n<\/tr>\n<\/thead>\n
1SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n156<\/td>\n21<\/td>\n<\/tr>\n
2SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n156<\/td>\n21<\/td>\n<\/tr>\n
3SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n167<\/td>\n21<\/td>\n<\/tr>\n
4SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n168<\/td>\n21<\/td>\n<\/tr>\n
5SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n172<\/td>\n21<\/td>\n<\/tr>\n
6SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n178<\/td>\n21<\/td>\n<\/tr>\n
7SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n189<\/td>\n21<\/td>\n<\/tr>\n
7NSA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n175<\/td>\n21<\/td>\n<\/tr>\n
8SA2<\/td>\n800<\/td>\n1 3\/8″ Z6<\/td>\n189<\/td>\n21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

<\/p>\n

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\u25b6 SA3 Series \u2014 Setting Torque: 1200 Nm<\/h3>\n

\"SA3<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
No.<\/th>\n\u03a0\u03b5\u03c1\u03b9\u03b3\u03c1\u03b1\u03c6\u03ae<\/th>\n\u03a3\u03b7\u03bc\u03b5\u03b9\u03ce\u03c3\u03b5\u03b9\u03c2<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nCirclip<\/td>\n<\/td>\n<\/tr>\n
2<\/td>\nRetaining washer<\/td>\n<\/td>\n<\/tr>\n
3<\/td>\nDust guard ring<\/td>\n<\/td>\n<\/tr>\n
4<\/td>\nPush pin kit<\/td>\n<\/td>\n<\/tr>\n
5<\/td>\nHub<\/td>\n<\/td>\n<\/tr>\n
6<\/td>\nPawl kit<\/td>\nQty.=16<\/td>\n<\/tr>\n
7<\/td>\nHousing with yoke<\/td>\n<\/td>\n<\/tr>\n
8<\/td>\nGrease nipple<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"SA3<\/p>\n<\/div>\n

<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
\u03a3\u03b5\u03b9\u03c1\u03ac<\/th>\nSetting Torque (Nm)<\/th>\n\u03a3\u03c0\u03bb\u03ac\u03b9\u03bd<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\n<\/tr>\n<\/thead>\n
2SA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n171<\/td>\n22<\/td>\n<\/tr>\n
3SA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n182<\/td>\n22<\/td>\n<\/tr>\n
4SA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n183<\/td>\n22<\/td>\n<\/tr>\n
5SA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n187<\/td>\n22<\/td>\n<\/tr>\n
6SA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n193<\/td>\n22<\/td>\n<\/tr>\n
7SA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n204<\/td>\n22<\/td>\n<\/tr>\n
7NSA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n190<\/td>\n22<\/td>\n<\/tr>\n
8SA3<\/td>\n1200<\/td>\n1 3\/8″ Z6<\/td>\n204<\/td>\n22<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

<\/p>\n

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\u25b6 SA4 Series \u2014 Setting Torque: 1600 Nm<\/h3>\n

\"SA4<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
No.<\/th>\n\u03a0\u03b5\u03c1\u03b9\u03b3\u03c1\u03b1\u03c6\u03ae<\/th>\n\u03a3\u03b7\u03bc\u03b5\u03b9\u03ce\u03c3\u03b5\u03b9\u03c2<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nCirclip<\/td>\n<\/td>\n<\/tr>\n
2<\/td>\nRetaining washer<\/td>\n<\/td>\n<\/tr>\n
3<\/td>\nDust guard ring<\/td>\n<\/td>\n<\/tr>\n
4<\/td>\nPush pin kit<\/td>\n<\/td>\n<\/tr>\n
5<\/td>\nHub<\/td>\n<\/td>\n<\/tr>\n
6<\/td>\nPawl kit<\/td>\nQty.=24<\/td>\n<\/tr>\n
7<\/td>\nHousing with yoke<\/td>\n<\/td>\n<\/tr>\n
8<\/td>\nGrease nipple<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"SA4<\/p>\n<\/div>\n

\n\n\n\n\n\n
\u03a3\u03b5\u03b9\u03c1\u03ac<\/th>\nSetting Torque (Nm)<\/th>\n\u03a3\u03c0\u03bb\u03ac\u03b9\u03bd<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\n<\/tr>\n<\/thead>\n
5SA4<\/td>\n1600<\/td>\n1 3\/8″ Z6<\/td>\n206<\/td>\n22<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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\u25b6 SA5 Series \u2014 Setting Torque: 2000 Nm<\/h3>\n

\"Ratchet<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
No.<\/th>\n\u03a0\u03b5\u03c1\u03b9\u03b3\u03c1\u03b1\u03c6\u03ae<\/th>\n\u03a3\u03b7\u03bc\u03b5\u03b9\u03ce\u03c3\u03b5\u03b9\u03c2<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nCirclip<\/td>\n<\/td>\n<\/tr>\n
2<\/td>\nRetaining washer<\/td>\n<\/td>\n<\/tr>\n
3<\/td>\nDust guard ring<\/td>\n<\/td>\n<\/tr>\n
4<\/td>\nPush pin kit<\/td>\n<\/td>\n<\/tr>\n
5<\/td>\nHub<\/td>\n<\/td>\n<\/tr>\n
6<\/td>\nPawl kit<\/td>\nQty.=40<\/td>\n<\/tr>\n
7<\/td>\nHousing with yoke<\/td>\n<\/td>\n<\/tr>\n
8<\/td>\nGrease nipple<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"Ratchet<\/p>\n<\/div>\n

\n\n\n\n\n
\u03a3\u03b5\u03b9\u03c1\u03ac<\/th>\nSetting Torque (Nm)<\/th>\n\u03a3\u03c0\u03bb\u03ac\u03b9\u03bd<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\n<\/tr>\n
6SA5<\/td>\n2000<\/td>\n1 3\/8″ Z6<\/td>\n231<\/td>\n22<\/td>\n<\/tr>\n<\/thead>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

 <\/p>\n<\/div>\n

<\/p>\n

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Where UK Operators Use Ratchet Torque Limiters<\/h2>\n
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\"PTOAcross the UK, ratchet torque limiters are a standard specification on a broad range of PTO-driven implements and stationary machines. In the arable sector, they appear on combine headers, straw choppers, seed drills, and cultivators \u2014 any application where sudden stone or crop root strikes can transmit catastrophic shock loads through the drivetrain. Livestock farmers rely on them in feed mixer wagons, slurry tankers, and manure spreaders operating in heavy, variable-density material conditions. In horticulture, ratchet torque limiters protect the gearboxes of rotavators and soil preparation equipment, which encounter unpredictable underground obstructions throughout the season.<\/p>\n

Beyond agriculture, UK industrial users fit ratchet torque limiters to pump drives, conveyors, compactors, and wood-processing equipment driven from stationary PTOs or gearbox outputs. The SA4 series at 1600 Nm is increasingly specified for heavy industrial conveyor applications where belt jams create high-energy impact loads. The audible ratchet click during overload also functions as a built-in diagnostic \u2014 maintenance teams can identify an overload event without any monitoring electronics, a practical advantage in remote farm buildings and outdoor industrial sites across England, Scotland, and Wales.<\/p>\n

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\ud83c\udf3e<\/div>\n
Arable Farming<\/div>\n<\/div>\n
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Livestock & Dairy<\/div>\n<\/div>\n
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Horticulture<\/div>\n<\/div>\n
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Industrial Conveyors<\/div>\n<\/div>\n
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Pump & Compactor Drives<\/div>\n<\/div>\n
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Wood Processing<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Complete PTO Drive Shaft Range<\/h2>\n
<\/div>\n

The ratchet torque limiter is one component of a complete PTO drivetrain solution. Our full range of PTO drive shafts covers every torque class and shaft configuration used in UK and European agricultural machinery. Each series is available with a choice of overload protection \u2014 ratchet, shear bolt, or friction disc \u2014 and can be paired with the shaft tube profile that matches your implement geometry.<\/p>\n

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\u2699<\/div>\n

PTO Drive Shaft G Series<\/a><\/h3>\n

Entry-level general-purpose shafts for compact tractors and light implements. Cost-effective protection with shear bolt limiters as standard.<\/p>\n

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\ud83d\udee0<\/div>\n

PTO Drive Shaft S Series<\/a><\/h3>\n

Mid-range shafts with slip clutch or ratchet torque limiter options. Ideal for mid-horsepower arable and grassland applications.<\/p>\n

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\ud83d\udcc8<\/div>\n

PTO Drive Shaft L Series<\/a><\/h3>\n

High-torque heavy-duty shafts for large-scale combiners, forage harvesters, and industrial drives up to 1000+ Nm continuous output.<\/p>\n

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\ud83c\udfdb<\/div>\n

PTO Drive Shaft T Series<\/a><\/h3>\n

Telescopic heavy-duty shafts with extended travel for implements requiring long working stroke. Available with ratchet torque limiters up to 1600 Nm.<\/p>\n

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Manufacturing Facility & Custom Engineering<\/h2>\n
<\/div>\n

Our production facility is equipped with CNC machining centres, automated heat-treatment lines, and precision torque calibration benches \u2014 giving us the capability to manufacture ratchet torque limiters to non-standard torque settings, alternative spline profiles, and custom hub bore diameters. UK OEM machinery builders frequently approach us for bespoke configurations that are not available from catalogue suppliers, and our engineering team can turn around a sample for customer approval within 15 working days for most custom variants.<\/p>\n

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\"PTO<\/div>\n<\/div>\n
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\u2713 Custom Torque Settings<\/div>\n
Non-standard Nm values available on minimum order quantities<\/div>\n<\/div>\n
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\u2713 Alternative Spline Profiles<\/div>\n
1 3\/4″ Z6, 1 3\/4″ Z20, and bespoke profiles on request<\/div>\n<\/div>\n
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\u2713 OEM Branding<\/div>\n
Private label and component marking available for UK dealer networks<\/div>\n<\/div>\n
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\u2713 15-Day Sample Lead Time<\/div>\n
Fast prototyping for UK OEM and aftermarket customers<\/div>\n<\/div>\n<\/div>\n
\ud83d\udd52 Get a Custom Quote<\/a><\/div>\n<\/div>\n

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Customer Success Stories<\/h2>\n
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<\/p>\n

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Case Study<\/div>\n
Lincolnshire, UK \u00b7 Arable Farming<\/div>\n<\/div>\n

Preventing Gearbox Failures During Heavy Clay Cultivation<\/h3>\n

A 2,400-acre arable operation in Lincolnshire had experienced three gearbox failures in two seasons on their combination seed drill and cultivator units, costing an estimated \u00a328,000 in replacement parts and lost planting days during the critical autumn window. After consulting with our technical team, the farm manager selected 6SA2 ratchet torque limiters (800 Nm) on the cultivator legs and 4SA3 units (1200 Nm) on the drill drive. Installed before the autumn 2024 drilling campaign, the limiters triggered audibly on 11 separate occasions when tine assemblies struck flint deposits \u2014 on each occasion re-engaging without operator intervention. The season completed with zero drivetrain damage. The farm now specifies our ratchet torque limiter as standard on all new implement purchases and has ordered 24 additional units for their spring cultivation fleet.<\/p>\n

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Outcome: Zero drivetrain failures across entire autumn campaign \u00b7 11 overload events auto-resolved \u00b7 ROI achieved within first season<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

“We fitted SA3 ratchet torque limiters to all four of our muck spreaders. The click-on-overload function has saved us from at least two major PTO shaft failures since fitting. Delivery from pto-drive-shafts.com was faster than I expected, and the technical specs matched exactly what we were working to.”<\/p>\n

\u2014 James H., Farm Manager \u00b7 Yorkshire, UK<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“As an agricultural machinery dealer in East Anglia, we’ve stocked ratchet torque limiters from various suppliers over the years. The SA-series from this supplier stands out on build quality \u2014 the forging finish and torque calibration accuracy are noticeably better than the alternatives we’ve tried at a similar price point. We now stock SA1 through SA3 as standard.”<\/p>\n

\u2014 P. Clements, Parts Manager \u00b7 Agricultural Dealer \u00b7 Suffolk, UK<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“We run a timber processing yard in Shropshire and use stationary PTO setups on several of our log splitters and chippers. The 5SA4 at 1600 Nm was exactly what we needed for the chipper drive \u2014 it takes the hit when a knot or hard section comes through and re-engages smoothly without us having to stop the machine. Worth every penny compared to what a seized gearbox costs.”<\/p>\n

\u2014 R. Griffiths, Operations Director \u00b7 Timber Processing \u00b7 Shropshire, UK<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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\u03a3\u03c5\u03c7\u03bd\u03ad\u03c2 \u03b5\u03c1\u03c9\u03c4\u03ae\u03c3\u03b5\u03b9\u03c2<\/h2>\n
<\/div>\n
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What is the typical price or cost of a ratchet torque limiter for UK agricultural machinery, and where can I get a quote from a reliable supplier?<\/h3>\n
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Pricing varies by series and order quantity. SA1 units at 400 Nm are the most economical, while SA4 units at 1600 Nm carry a higher cost reflecting the additional forged steel mass and higher pawl count. The best way to get an accurate price for your specific application is to email sales@pto-drive-shafts.com<\/a> with your required torque series and quantity. We respond to UK enquiries within one working day.<\/div>\n<\/div>\n<\/div>\n
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How do I know which SA series ratchet torque limiter is the right one for my tractor and implement combination in the UK?<\/h3>\n
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Start with the maximum continuous PTO torque your tractor delivers at 540 rpm and add a service factor for the type of load \u2014 impact loads from cultivators or choppers typically require a factor of 1.5 to 2.0. Match the result to the nearest series: SA1 for up to 400 Nm, SA2 for up to 800 Nm, SA3 for up to 1200 Nm, and SA4 for up to 1600 Nm. If you are unsure, contact our team with your tractor make, model, and implement type and we can recommend the correct series.<\/div>\n<\/div>\n<\/div>\n
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What is the difference between a ratchet torque limiter and a shear bolt torque limiter, and which one should I choose for UK arable farming?<\/h3>\n
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A shear bolt limiter uses a sacrificial bolt that breaks on overload, requiring the operator to stop, replace the bolt, and restart \u2014 each event takes several minutes and carries a consumable parts cost. A ratchet torque limiter disengages and re-engages automatically without any parts replacement or machine stoppage. For UK arable operations where impact events are frequent (stones, buried debris, variable crop density), the ratchet design offers significantly lower lifetime cost and higher productivity, though it carries a slightly higher upfront price than a shear bolt unit of equivalent torque rating.<\/div>\n<\/div>\n<\/div>\n
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Where can I find a ratchet torque limiter supplier that ships to the UK and can provide custom torque settings for OEM machinery builds?<\/h3>\n
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We ship ratchet torque limiters to UK addresses directly from our manufacturing facility, with standard ex-works lead times of 7\u201314 days for catalogue sizes and 15\u201320 days for custom configurations. OEM customers requiring non-standard torque values, alternative bore diameters, or private label components are welcome to contact our engineering team at sales@pto-drive-shafts.com<\/a> to discuss requirements and minimum order quantities.<\/div>\n<\/div>\n<\/div>\n
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How often does a ratchet torque limiter need servicing or greasing when used on a UK farm PTO shaft?<\/h3>\n
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Under typical UK farm conditions, we recommend greasing the ratchet torque limiter via its grease nipple every 50 operating hours or at the start of each new seasonal campaign \u2014 whichever comes first. In particularly dusty or wet conditions (autumn drilling in heavy clay soils, slurry spreading), a 25-hour interval is advisable. The grease nipple is positioned for easy access without removing the shaft from the implement. Annual inspection of the pawl springs and dust guard rings for signs of wear or deformation is also recommended.<\/div>\n<\/div>\n<\/div>\n
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When should I use an SA4 ratchet torque limiter at 1600 Nm instead of an SA3 for my UK industrial conveyor or heavy processing application?<\/h3>\n
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Choose the SA4 series when your drive system peak torque \u2014 including dynamic impact loading at jam events \u2014 exceeds 1200 Nm. Industrial applications such as heavy belt conveyors, wood chippers processing large-diameter material, and aggregate processing equipment typically see peak torque values two to three times the running torque, which can push requirements into the SA4 range even when the continuous duty torque is modest. If you are specifying for a new machine and have torque load data from FEA or field measurement, our engineering team can validate your series selection before you commit to a purchase.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Ready to Specify or Source a Ratchet Torque Limiter for Your UK Application?<\/h2>\n

Send your torque requirement, spline size, and quantity to our team for a fast, accurate quotation. UK B2B enquiries answered within one working day.<\/p>\n

\u2709 sales@pto-drive-shafts.com<\/a><\/p>\n<\/div>\n

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Ratchet torque limiter for PTO shafts \u2014 forged steel housing with yoke, 8\u201332 pawl kit, 400\u20131600 Nm, 1 3\/8″ Z6 spline. Auto re-engages.<\/p>","protected":false},"featured_media":3394,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1800],"product_tag":[],"class_list":["post-3393","product","type-product","status-publish","has-post-thumbnail","product_cat-torque-limiter","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product\/3393","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/comments?post=3393"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/media\/3394"}],"wp:attachment":[{"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/media?parent=3393"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product_brand?post=3393"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product_cat?post=3393"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/el\/wp-json\/wp\/v2\/product_tag?post=3393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}