{"id":3421,"date":"2026-06-26T05:21:26","date_gmt":"2026-06-26T05:21:26","guid":{"rendered":"https:\/\/www.pto-drive-shafts.com\/?post_type=product&p=3421"},"modified":"2026-07-01T03:31:56","modified_gmt":"2026-07-01T03:31:56","slug":"automatic-torque-limiter","status":"publish","type":"product","link":"https:\/\/www.pto-drive-shafts.com\/vi\/san-pham\/automatic-torque-limiter\/","title":{"rendered":"Automatic Torque Limiter"},"content":{"rendered":"

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<\/div>\n
PTO Driveline Protection<\/div>\n

Automatic Torque Limiter
\nfor PTO Drive Shafts \u2014 UK Agricultural & Industrial Supply<\/span><\/h2>\n

Self-resetting overload protection engineered for demanding UK farm machinery and industrial drivelines. Torque range 1600\u20134500 Nm. Cam-and-spring mechanism. No manual reset required.<\/p>\n

\u2709 Get a Quote<\/a><\/p>\n<\/div>\n

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What Is an Automatic Torque Limiter?<\/h2>\n

\"AutomaticAn automatic torque limiter is a precision overload protection device integrated into PTO drive shaft assemblies. When transmitted torque exceeds the preset threshold \u2014 whether from sudden shock loads, ground engagement, or machine jams \u2014 the limiter disengages the driveline instantly, protecting both the gearbox and the driven implement from costly mechanical damage. Unlike shear bolt designs that require manual bolt replacement after every overload event, the automatic torque limiter resets itself once the overload condition clears, allowing uninterrupted operation across long working days in the field. This makes it the preferred choice across UK arable farms, contractor fleets, and light industrial driveline applications where uptime directly affects profitability.<\/p>\n

The internal cam-and-spring mechanism engages and disengages smoothly without generating the abrupt shock loads associated with ratchet-type limiters. Spring pack preload defines the trip torque, while four hardened cams distribute contact stress evenly across the hub, extending service life even under frequent cycling. Sealing rings and O-rings provide IP-rated ingress protection, making the unit suitable for the wet and muddy conditions routinely encountered on UK farmland from October through April.<\/p>\n

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\u2709 Request a Quote<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Why UK Buyers Choose Our Automatic Torque Limiter<\/h2>\n
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\u26a1<\/div>\n
Fully Automatic Reset<\/div>\n
No tool intervention needed after an overload event. The spring pack re-engages the cams once torque drops below the trip threshold, giving operators more uptime per shift.<\/div>\n<\/div>\n
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\ud83d\udee0<\/div>\n
Wide Torque Range<\/div>\n
Series coverage from 1600 Nm up to 4500 Nm, with 1 3\/8″ Z6, 1 3\/8″ Z21, 1 3\/4″ Z6, and 1 3\/4″ Z20 spline options to match any tractor PTO output shaft standard.<\/div>\n<\/div>\n
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\ud83d\udeb2<\/div>\n
Sealed Against Contamination<\/div>\n
Dual sealing ring and O-ring configuration keeps moisture, soil, and chaff away from the spring and cam surfaces, maintaining consistent trip torque across the season.<\/div>\n<\/div>\n
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\ud83c\udf1f<\/div>\n
Drop-In Compatibility<\/div>\n
Standard outer housing diameter (Phi 152 or Phi 176 mm) and A-dimension lengths (207.5\u2013233 mm) align with ISO 8210 and major OEM shaft envelope requirements for straightforward retrofit.<\/div>\n<\/div>\n
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\ud83d\udcc8<\/div>\n
Consistent Trip Accuracy<\/div>\n
Precision-ground cams and hardened spring packs deliver repeatable engagement and disengagement torques within tight tolerances, protecting gearbox rated limits cycle after cycle.<\/div>\n<\/div>\n
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\ud83d\udd0c<\/div>\n
Custom Configuration Available<\/div>\n
Non-standard torque ratings, alternative spline profiles, and bespoke shaft lengths are available through our factory engineering team for OEM and fleet replacement contracts.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Operating Principle, Materials & Application Scenarios<\/h2>\n

The automatic torque limiter operates on a cam-overcentre principle. Four hardened steel cams sit in recesses machined into the inner hub, held in contact with matching detents in the outer housing by a calibrated spring pack. During normal power transmission the entire assembly rotates as one unit. The moment torque exceeds the preset value \u2014 say 2600 Nm on a 7NSC151.C unit \u2014 the cams ride up over the detent faces against spring resistance, separating the housing from the hub and allowing relative rotation. This action absorbs the energy spike in milliseconds, well before it can propagate downstream to the implement gearbox or the tractor’s driveline components. As soon as the load falls back within operating range, the spring pack pushes the cams back into their detents and power transmission resumes automatically, typically within a single shaft rotation.<\/p>\n

The outer housing and yoke are manufactured from ductile cast iron or forged steel depending on the series, providing the mass and rigidity needed for high-speed driveline applications. The cam and taper pin components are case-hardened alloy steel, heat-treated to HRC 58\u201362 on working surfaces to resist wear even after repeated trip cycling. Bushings at positions 2, 5, and 10 are sintered bronze, pre-impregnated with lubricant, minimising maintenance intervals in the field. The locking plate and snap ring assembly retain axial position under vibration, an important detail on PTO shafts running at 540 rpm or 1000 rpm where dynamic loads can cause axial drift in inferior designs.<\/p>\n

Application scenarios span the full breadth of UK agricultural contracting. Slurry tanker PTO pumps encounter frequent viscosity spikes as solids pass through the impeller \u2014 the automatic torque limiter handles these without operator awareness. Rotary cultivators and power harrows regularly strike embedded stones in British fields; an automatic limiter on the driveline shaft prevents the catastrophic gearbox failures that can put a machine out of action during critical seedbed preparation windows. Flail mowers, round balers, and forage wagons all benefit similarly. Beyond the farm gate, the same units are used on industrial shredders, compost turners, and road maintenance equipment where momentary jam loads are an inherent part of the duty cycle.<\/p>\n

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Component Parts Reference<\/h3>\n

\"Automatic<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
No.<\/th>\nS\u1ef1 mi\u00eau t\u1ea3<\/th>\nGhi ch\u00fa<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nOuter housing + yoke<\/td>\n<\/td>\n<\/tr>\n
2<\/td>\nBushing<\/td>\n<\/td>\n<\/tr>\n
3<\/td>\nSpring pack<\/td>\n<\/td>\n<\/tr>\n
4<\/td>\nHub with taper pin and bushings<\/td>\n<\/td>\n<\/tr>\n
5<\/td>\nBushing<\/td>\n<\/td>\n<\/tr>\n
6<\/td>\nSealing ring<\/td>\n<\/td>\n<\/tr>\n
7<\/td>\nO-ring<\/td>\n<\/td>\n<\/tr>\n
8<\/td>\nLocking plate<\/td>\n<\/td>\n<\/tr>\n
9<\/td>\nSnap ring<\/td>\n<\/td>\n<\/tr>\n
10<\/td>\nBushing<\/td>\nQty.=4<\/td>\n<\/tr>\n
11<\/td>\nCam<\/td>\nQty.=4<\/td>\n<\/tr>\n
12<\/td>\nTaper pin<\/td>\nWith nuts<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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Technical Specifications<\/h2>\n

Full model range \u2014 dimensions and torque ratings<\/p>\n

\n
\"Automatic<\/div>\n<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Lo\u1ea1t<\/th>\nTorque (Nm)<\/th>\nSpline<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\nC (mm)<\/th>\n<\/tr>\n<\/thead>\n
4SC151<\/td>\n1600<\/td>\n1 3\/8″ Z6<\/td>\n207.5<\/td>\n28<\/td>\n\u03a6152<\/td>\n<\/tr>\n
4SC151.D<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
5SC151<\/td>\n2100<\/td>\n1 3\/8″ Z6<\/td>\n213<\/td>\n<\/tr>\n
6SC151.D<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
6SC151<\/td>\n2600<\/td>\n1 3\/8″ Z6<\/td>\n213<\/td>\n<\/tr>\n
6SC151.D<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
6SC151.C<\/td>\n2100<\/td>\n1 3\/4″ Z6<\/td>\n<\/tr>\n
6SC151.E<\/td>\n1 3\/4″ Z20<\/td>\n<\/tr>\n
7NSC151<\/td>\n2800<\/td>\n1 3\/8″ Z6<\/td>\n213<\/td>\n<\/tr>\n
7NSC151.D<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
7NSC151.C<\/td>\n2600<\/td>\n1 3\/4″ Z6<\/td>\n<\/tr>\n
7NSC151.E<\/td>\n1 3\/4″ Z20<\/td>\n<\/tr>\n
8SC151<\/td>\n2800<\/td>\n1 3\/8″ Z6<\/td>\n220<\/td>\n<\/tr>\n
8SC151.D<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
8SC151.C<\/td>\n2600<\/td>\n1 3\/4″ Z6<\/td>\n<\/tr>\n
8SC151.E<\/td>\n1 3\/4″ Z20<\/td>\n<\/tr>\n
36SC151<\/td>\n2800<\/td>\n1 3\/8″ Z6<\/td>\n213<\/td>\n<\/tr>\n
36SC151.D<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
36SC151.C<\/td>\n2600<\/td>\n1 3\/4″ Z6<\/td>\n<\/tr>\n
36SC151.E<\/td>\n1 3\/4″ Z20<\/td>\n<\/tr>\n

<\/p>\n

8SC176<\/td>\n3000<\/td>\n1 3\/8″ Z6<\/td>\n224<\/td>\n28<\/td>\n\u03a676<\/td>\n<\/tr>\n
8SC176.D<\/td>\n3500<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
8SC176.C<\/td>\n1 3\/8″ Z6<\/td>\n<\/tr>\n
8SC176.E<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
9SC176<\/td>\n4000<\/td>\n1 3\/8″ Z6<\/td>\n233<\/td>\n<\/tr>\n
9SC176.D<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
9SC176.C<\/td>\n4500<\/td>\n1 3\/4″ Z6<\/td>\n<\/tr>\n
9SC176.E<\/td>\n1 3\/4″ Z20<\/td>\n<\/tr>\n
8SC176<\/td>\n3500<\/td>\n1 3\/8″ Z6<\/td>\n233<\/td>\n<\/tr>\n
8SC176.D<\/td>\n4000<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
8SC176.C<\/td>\n4500<\/td>\n1 3\/4″ Z6<\/td>\n<\/tr>\n
8SC176.E<\/td>\n1 3\/4″ Z20<\/td>\n<\/tr>\n
8SC176<\/td>\n3500<\/td>\n1 3\/8″ Z6<\/td>\n233<\/td>\n<\/tr>\n
8SC176.D<\/td>\n4000<\/td>\n1 3\/8″ Z21<\/td>\n<\/tr>\n
8SC176.C<\/td>\n4500<\/td>\n1 3\/4″ Z6<\/td>\n<\/tr>\n
8SC176.E<\/td>\n4500<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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

The automatic torque limiter is available as a protection component across our full driveline series. Browse the four core shaft families below.<\/p>\n

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\ud83d\udd29 G Series<\/div>\n
Standard-duty agricultural PTO drive shaft. Suitable for light to medium implements including mowers, spreaders, and pumps.<\/div>\n

PTO Drive Shaft G Series \u2192<\/a><\/p>\n<\/div>\n

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\ud83d\udd2b S Series<\/div>\n
Heavy-duty series engineered for high-torque implements including tillers, flail mowers, and balers across UK contracting operations.<\/div>\n

PTO Drive Shaft S Series \u2192<\/a><\/p>\n<\/div>\n

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\ud83d\udd27 L Series<\/div>\n
Long-length PTO shaft series for extended reach applications \u2014 ideal for front-mounted implements and wide-angle driveline configurations.<\/div>\n

PTO Drive Shaft L Series \u2192<\/a><\/p>\n<\/div>\n

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\u2699 T Series<\/div>\n
Telescopic PTO drive shaft designed for variable-length applications where implement position changes during operation.<\/div>\n

PTO Drive Shaft T Series \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Customer Success Stories<\/h2>\n

Real-world outcomes from UK and European driveline professionals<\/p>\n

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\ud83c\udfed Case Study \u2014 Lincolnshire Arable Contractor, UK<\/div>\n
Rotary Cultivator Fleet Overload Protection Upgrade | 2024<\/div>\n
\"PTO<\/div>\n

A Lincolnshire-based agricultural contractor operating a fleet of twelve 150\u2013180 hp tractors and six heavy rotary cultivators was experiencing recurring PTO gearbox failures during spring seedbed work on land with embedded flint and stone. Average gearbox replacement cost ran to approximately GBP 1,400 per unit, with additional losses from machine downtime during a critical six-week cultivating window. After replacing the shear bolt limiters on all six cultivator PTO shafts with 7NSC151 automatic torque limiters rated at 2800 Nm, the contractor reported zero gearbox failures across the following two spring seasons. Maintenance time spent replacing broken shear bolts \u2014 previously estimated at two to three hours per machine per season \u2014 was eliminated entirely. The investment paid back within the first season.<\/p>\n

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Zero gearbox failures in 2 seasons<\/div>\n
ROI within first season<\/div>\n
Eliminated shear bolt downtime<\/div>\n
<\/div>\n<\/div>\n<\/div>\n

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

“We fitted your 8SC151 units to our two square balers last harvest. Caught three stone strikes that would have written off the flywheel each time. The shaft just kicked and carried on \u2014 the operator didn’t even know it had happened until he checked the field marker.”<\/p>\n

\u2014 James R., Farm Manager<\/div>\n
Norfolk, England<\/div>\n<\/div>\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Ordered six 9SC176.C units for our industrial shredder line. Lead time was tight but the team managed it. Dimensions matched our existing driveline housing perfectly \u2014 no modification needed. Performance in service has been faultless over eight months of continuous production use.”<\/p>\n

\u2014 Sarah T., Procurement Manager<\/div>\n
West Midlands Industrial Recycler<\/div>\n<\/div>\n
\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n

“We supply replacement driveline parts across the Scottish Borders and Northumberland. Your automatic torque limiters have become a standard recommendation for any client upgrading from shear bolt designs. The quality is consistent batch to batch, which matters when we’re keeping stock for emergency call-outs.”<\/p>\n

\u2014 Graeme M., Agricultural Dealer<\/div>\n
Scottish Borders, Scotland<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Manufacturing Capability & Custom Orders<\/h2>\n
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\"PTO<\/div>\n<\/div>\n

Our manufacturing facility operates dedicated CNC machining centres for cam profiles, hub bores, and spline cutting, with in-line torque calibration rigs that verify every automatic torque limiter assembly before despatch. The production team holds the tooling and process documentation to handle bespoke orders alongside standard catalogue items without affecting lead times on either. Whether you need a non-standard trip torque setting within the 1600\u20134500 Nm envelope, a different spline profile to match a proprietary tractor output shaft, or a modified A-dimension to fit within a constrained driveline space, our engineering team works from your drawings or a sample unit and turns around confirmed specifications within 48 hours.<\/p>\n

OEM contracts are handled under non-disclosure agreements with stable long-term pricing structures. Bulk order discounts are available from quantities of ten units upward, and we maintain forward stock programs for UK distributors and agricultural dealers who need rapid response to seasonal demand peaks. All units shipped to the UK carry full material traceability documentation and are available with third-party inspection certification on request \u2014 important for fleet procurement decisions where maintenance records need to satisfy dealership warranty requirements.<\/p>\n

\u2709 Get a Quote from Our Factory<\/a><\/div>\n<\/div>\n

<\/p>\n

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Frequently Asked Questions<\/h2>\n

Common questions from UK agricultural and industrial buyers<\/p>\n

\nWhat is the difference between an automatic torque limiter and a shear bolt torque limiter for UK tractor PTO shafts? \u25bc<\/span><\/summary>\n
A shear bolt torque limiter protects the driveline by breaking a sacrificial bolt when overload occurs, requiring the operator to stop the tractor, locate a replacement bolt, and manually re-install it before work can resume. An automatic torque limiter uses a spring-loaded cam mechanism that disengages under overload and re-engages automatically once the load clears, with no manual intervention required. For UK contractors working long days during tight cultivation or baling windows, the time saved avoiding repeated shear bolt replacements can be significant \u2014 particularly on stony land where overloads may occur multiple times per field pass.<\/div>\n<\/details>\n
\nHow do I choose the right automatic torque limiter series for my rotary cultivator or flail mower operating in England? \u25bc<\/span><\/summary>\n
Selection depends on three factors: the rated input torque of your implement gearbox, the PTO output shaft spline standard on your tractor (1 3\/8″ six-spline at 540 rpm or 1 3\/8″ \/ 1 3\/4″ 21-spline at 1000 rpm), and the physical envelope available in your driveline. As a starting point, match the limiter trip torque to approximately 120\u2013130% of the implement’s rated gearbox input torque. This gives enough headroom for normal operation while still protecting against genuine overload. For example, a rotary cultivator rated at 2100 Nm input would suit a 5SC151 or 6SC151 unit. Send us your implement specifications and tractor model and our team will confirm the correct series.<\/div>\n<\/details>\n
\nCan I get a price and delivery quote for automatic torque limiters shipped to a UK address \u2014 what is the typical lead time for orders from England or Scotland? \u25bc<\/span><\/summary>\n
Standard catalogue models are typically available for dispatch within 3\u20137 working days from our warehouse. UK delivery from dispatch is generally 5\u201310 working days depending on shipping mode selected. For bespoke or non-catalogue configurations, engineering confirmation takes 48 hours and production lead time is typically 2\u20134 weeks depending on order volume. To receive an accurate price and delivery quote, email sales@pto-drive-shafts.com<\/a> with your required series, quantity, and delivery postcode. We respond to all UK enquiries within one working day.<\/div>\n<\/details>\n
\nWhere can a UK agricultural dealer or machinery supplier buy automatic torque limiters in bulk with competitive wholesale pricing? \u25bc<\/span><\/summary>\n
We work directly with UK agricultural dealers, farm machinery importers, and parts distributors, offering tiered wholesale pricing from quantities of ten units. We do not require exclusive distribution arrangements, so dealers can source from us alongside their existing supply chain. We provide branded or white-label packaging options, full traceability documentation, and access to our full technical support team for customer queries. Contact sales@pto-drive-shafts.com<\/a> to discuss a dealer account and receive our current wholesale price list.<\/div>\n<\/details>\n
\nHow does an automatic torque limiter protect a PTO gearbox when a stone is struck during power harrowing on heavy clay soil in the UK Midlands? \u25bc<\/span><\/summary>\n
When a tine on a power harrow strikes an embedded stone, the instantaneous resistance can spike the driveline torque to several times the normal operating value \u2014 sometimes within 5\u201310 milliseconds. The automatic torque limiter’s spring-loaded cams detect this spike as soon as it exceeds the preset trip torque. The cams ride over their detents, separating the outer housing from the hub and effectively disconnecting the tractor’s PTO output from the implement’s gearbox input for the duration of the overload. The gearbox never sees the full shock load. Once the tine passes the obstruction and driveline torque drops back to normal, the spring pack re-engages the cams, usually within one shaft revolution, and harrowing resumes without any operator intervention.<\/div>\n<\/details>\n
\nWhich automatic torque limiter models are suitable for 1000 rpm PTO applications on modern high-horsepower tractors used in British arable farming? \u25bc<\/span><\/summary>\n
For 1000 rpm PTO outputs, the relevant spline standards are 1 3\/8″ Z21 (suffix .D models) and 1 3\/4″ Z20 (suffix .E models) or 1 3\/4″ Z6 (suffix .C models). Within our range, this covers models including 8SC151.D, 7NSC151.D, 9SC176.D, and corresponding .C and .E variants depending on your spline size preference. Modern high-horsepower tractors in the 200\u2013300 hp bracket typically run implements requiring limiters in the 2800\u20134500 Nm range, pointing to the 8SC151, 36SC151, 8SC176, and 9SC176 series. We recommend sharing your tractor make, model, and implement specifications so we can cross-reference the exact variant.<\/div>\n<\/details>\n<\/div>\n

<\/p>\n

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Ready to Protect Your PTO Driveline?<\/div>\n
Send your requirements to our team for a fast, no-obligation quote \u2014 UK enquiries answered within one working day.<\/div>\n

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

ch\u1ec9nh s\u1eeda b\u1edfi gzl<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Automatic torque limiter for PTO drive shafts \u2014 cam-and-spring mechanism, 1600\u20134500 Nm, hardened steel cams, self-resetting overload protection. UK supply.<\/p>","protected":false},"featured_media":3425,"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-3421","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\/vi\/wp-json\/wp\/v2\/product\/3421","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/comments?post=3421"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/media\/3425"}],"wp:attachment":[{"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/media?parent=3421"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/product_brand?post=3421"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/product_cat?post=3421"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.pto-drive-shafts.com\/vi\/wp-json\/wp\/v2\/product_tag?post=3421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}