{"id":1815,"date":"2026-03-17T03:49:25","date_gmt":"2026-03-17T03:49:25","guid":{"rendered":"https:\/\/limitertorque.com\/product\/pto-shaft-shear-bolt-torque-limiter-sb-sbt1-series\/"},"modified":"2026-03-17T03:49:26","modified_gmt":"2026-03-17T03:49:26","slug":"pto-shaft-shear-bolt-torque-limiter-sb-sbt1-series","status":"publish","type":"product","link":"https:\/\/limitertorque.com\/ta\/product\/pto-shaft-shear-bolt-torque-limiter-sb-sbt1-series\/","title":{"rendered":"PTO Shaft Shear Bolt Torque Limiter \u2013 SB\/SBT1 Series"},"content":{"rendered":"
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<\/p>\n

PTO Shaft Shear Bolt Torque Limiter \u2013 SB\/SBT1 Series<\/h1>\n
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\n\"Shear\n<\/div>\n
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The PTO Shaft Shear Bolt Torque Limiter \u2013 SB\/SBT1 Series<\/strong> is a premium-quality shear bolt torque limiter<\/strong> specifically engineered for PTO (Power Take-Off) drive shaft systems used across agricultural, industrial, and forestry machinery. Also known as a PTO slip clutch<\/em>, PTO safety clutch<\/em>, or tractor PTO overload protector<\/em>, this device safeguards your expensive equipment from damage caused by sudden torque overloads, obstructions, and operational jamming.<\/p>\n

Available Models:<\/strong> 1SB, 1SBT1, 2SB, 2SBT1, 3SB, 3SBT1, 4SB, 4SBT1, 5SB, 5SBT1, 6SB, 6SBT1, 32SB, 32SBT1, 7SB, 7SBT1, 7NSB, 7NSBT1, 8SB, 8SBT1, 8SB.C, 8SBT1.C, 38SB, 9SB, 9SBT1, 9SB.C, 9SBT1.C, 10SB, 10SBT1, 10SB.C, 10SBT1.C, 36SB, 36SBT1, 42SB, 42SBT1, 42SB.C, 42SBT1.C<\/p>\n

Torque Range:<\/strong> Torque<\/span>: 570\u20134500 Nm<\/span><\/span><\/p>\n

Spline Options:<\/strong> 1 3\/8″ Z6, 1 3\/8″ Z6, 1 3\/4″ Z6<\/p>\n

Key Components:<\/strong> Yoke, Grease nipple, Steel ball, Hub, Push pin, Shear bolt & Nut<\/p>\n

Request a Quote →<\/a><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Technical Specifications & Dimensions<\/h2>\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
Series<\/th>\nTorque (Nm)<\/th>\nSpline<\/th>\nA (mm)<\/th>\nB (mm)<\/th>\nC (mm)<\/th>\nD (mm)<\/th>\n<\/tr>\n
1SB<\/td>\n570<\/td>\n1 3\/8″Z6<\/td>\n95<\/td>\n20<\/td>\n35<\/td>\nM6\u00d740<\/td>\n<\/tr>\n
1SBT1<\/td>\n740<\/td>\n1 3\/8″Z6<\/td>\n95<\/td>\n20<\/td>\n45<\/td>\nM6\u00d740<\/td>\n<\/tr>\n
2SB<\/td>\n740<\/td>\n1 3\/8″Z6<\/td>\n98<\/td>\n20<\/td>\n45<\/td>\nM6\u00d740<\/td>\n<\/tr>\n
2SBT1<\/td>\n790<\/td>\n1 3\/8″Z6<\/td>\n98<\/td>\n20<\/td>\n48<\/td>\nM6\u00d740<\/td>\n<\/tr>\n
3SB<\/td>\n1110<\/td>\n1 3\/8″Z6<\/td>\n102<\/td>\n21<\/td>\n38<\/td>\nM8\u00d745<\/td>\n<\/tr>\n
3SBT1<\/td>\n1200<\/td>\n1 3\/8″Z6<\/td>\n102<\/td>\n21<\/td>\n40<\/td>\nM8\u00d745<\/td>\n<\/tr>\n
4SB<\/td>\n1400<\/td>\n1 3\/8″Z6<\/td>\n107<\/td>\n21<\/td>\n48<\/td>\nM8\u00d750<\/td>\n<\/tr>\n
4SBT1<\/td>\n1600<\/td>\n1 3\/8″Z6<\/td>\n107<\/td>\n21<\/td>\n55<\/td>\nM8\u00d750<\/td>\n<\/tr>\n
5SB<\/td>\n1600<\/td>\n1 3\/8″Z6<\/td>\n114<\/td>\n21<\/td>\n55<\/td>\nM8\u00d745<\/td>\n<\/tr>\n
5SBT1<\/td>\n2100<\/td>\n1 3\/8″Z6<\/td>\n114<\/td>\n21<\/td>\n46<\/td>\nM10\u00d750<\/td>\n<\/tr>\n
6SB<\/td>\n1750<\/td>\n1 3\/8″Z6<\/td>\n137<\/td>\n21<\/td>\n60<\/td>\nM8\u00d755<\/td>\n<\/tr>\n
6SBT1<\/td>\n2500<\/td>\n1 3\/8″Z6<\/td>\n137<\/td>\n21<\/td>\n55<\/td>\nM10\u00d755<\/td>\n<\/tr>\n
32SB<\/td>\n1600<\/td>\n1 3\/8″Z6<\/td>\n114<\/td>\n21<\/td>\n55<\/td>\nM8\u00d745<\/td>\n<\/tr>\n
32SBT1<\/td>\n2100<\/td>\n1 3\/8″Z6<\/td>\n114<\/td>\n21<\/td>\n46<\/td>\nM10\u00d750<\/td>\n<\/tr>\n
7SB<\/td>\n2050<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n45<\/td>\nM10\u00d760<\/td>\n<\/tr>\n
7SBT1<\/td>\n3200<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n49<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
7NSB<\/td>\n2300<\/td>\n1 3\/8″Z6<\/td>\n139<\/td>\n24<\/td>\n50<\/td>\nM10\u00d765<\/td>\n<\/tr>\n
7NSBT1<\/td>\n3000<\/td>\n1 3\/8″Z6<\/td>\n139<\/td>\n24<\/td>\n60<\/td>\nM10\u00d765<\/td>\n<\/tr>\n
8SB<\/td>\n2700<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
8SBT1<\/td>\n3500<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n60<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
8SB.C<\/td>\n2700<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM10\u00d765<\/td>\n<\/tr>\n
8SBT1.C<\/td>\n3500<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
38SB<\/td>\n2700<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n60<\/td>\nM10\u00d765<\/td>\n<\/tr>\n
9SB<\/td>\n3500<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
9SBT1<\/td>\n4000<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n60<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
9SB.C<\/td>\n3500<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
9SBT1.C<\/td>\n4000<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n60<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
10SB<\/td>\n3500<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n49<\/td>\nM14\u00d770<\/td>\n<\/tr>\n
10SBT1<\/td>\n4500<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
10SB.C<\/td>\n3500<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n49<\/td>\nM14\u00d770<\/td>\n<\/tr>\n
10SBT1.C<\/td>\n4500<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n49<\/td>\nM14\u00d770<\/td>\n<\/tr>\n
36SB<\/td>\n2400<\/td>\n1 3\/8″Z6<\/td>\n137<\/td>\n24<\/td>\n53<\/td>\nM10\u00d765<\/td>\n<\/tr>\n
36SBT1<\/td>\n3200<\/td>\n1 3\/8″Z6<\/td>\n137<\/td>\n24<\/td>\n49<\/td>\nM10\u00d765<\/td>\n<\/tr>\n
42SB<\/td>\n3500<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
42SBT1<\/td>\n4000<\/td>\n1 3\/8″Z6<\/td>\n152<\/td>\n24<\/td>\n60<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
42SB.C<\/td>\n3500<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n57<\/td>\nM12\u00d765<\/td>\n<\/tr>\n
42SBT1.C<\/td>\n4000<\/td>\n1 3\/4″Z6<\/td>\n152<\/td>\n24<\/td>\n60<\/td>\nM12\u00d765<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

* All dimensions in millimeters. Torque values in Newton-meters (Nm). Spline specifications follow ISO\/ASAE standards. Contact us for custom configurations.<\/p>\n

\"PTO<\/p>\n

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Key Features & Advantages<\/h2>\n
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🔒<\/p>\n

Precision Overload Protection<\/p>\n

Calibrated to disconnect at exact torque thresholds, preventing costly damage to gearboxes, bearings, and implement mechanisms.<\/p>\n<\/div>\n

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⚡<\/p>\n

Rapid Response Time<\/p>\n

Triggers within milliseconds of overload onset, minimizing the duration of damaging torque transfer to connected equipment.<\/p>\n<\/div>\n

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🔧<\/p>\n

Easy Maintenance & Service<\/p>\n

Simple modular design allows fast field service with standard tools. Replacement parts are readily available and affordable.<\/p>\n<\/div>\n

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🏭<\/p>\n

Industrial-Grade Materials<\/p>\n

Precision-machined from hardened alloy steel with heat-treated critical surfaces for maximum durability and service life.<\/p>\n<\/div>\n

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🛠<\/p>\n

Universal PTO Compatibility<\/p>\n

Standard 1 3\/8″ Z6 spline interface fits all major tractor and implement PTO shafts without adapters or modification.<\/p>\n<\/div>\n

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⛳<\/p>\n

Sealed & Protected Design<\/p>\n

Grease-lubricated internals with dust seals protect against contamination in harsh agricultural environments.<\/p>\n<\/div>\n<\/div>\n

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How It Works \u2014 Operating Principle<\/h2>\n

The shear bolt torque limiter operates on a straightforward yet highly effective mechanical principle. A precision-grade shear bolt connects the driving and driven halves of the clutch assembly. Under normal operating conditions, the shear bolt transmits full rotational torque from the PTO shaft to the connected implement. When torque exceeds the bolt’s calibrated shear strength \u2014 caused by a sudden jam, obstruction, or overload \u2014 the bolt shears cleanly at its designed breakpoint. This instantaneously disconnects the driveline, preventing the overload from reaching and damaging expensive downstream components such as gearboxes, bearings, and implement mechanisms. The system resets by simply replacing the sheared bolt with a new one of the correct grade, restoring full operation within minutes.<\/p>\n

Reset Method:<\/strong> Manual \u2014 replace shear bolt (supplied in kit)<\/p>\n

Best Suited For:<\/strong> Applications with infrequent overloads where precise trip torque and maximum safety are paramount<\/p>\n

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Typical Agricultural Application Scenarios<\/h2>\n
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Rotary Mowers & Flail Mowers<\/p>\n

Protects the mower gearbox from damage when blades strike hidden rocks, stumps, or metal debris. The torque limiter absorbs the shock load and prevents it from reaching the tractor PTO.<\/p>\n<\/div>\n

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Hay Balers & Round Balers<\/p>\n

Prevents baler mechanism damage during slug feeding, twine wrapping failures, or foreign object ingestion by disconnecting the driveline before damaging torque levels are reached.<\/p>\n<\/div>\n

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Rotary Tillers & Cultivators<\/p>\n

Guards the tiller gearbox and tractor PTO when tines encounter buried rocks, roots, or compacted soil layers that can generate extreme torque spikes.<\/p>\n<\/div>\n

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Manure Spreaders<\/p>\n

Protects the beater mechanism and gearbox from overload when encountering frozen clumps, foreign objects, or uneven material distribution in the hopper.<\/p>\n<\/div>\n

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Feed Mixers & TMR Wagons<\/p>\n

Safeguards the mixer auger drive from damage caused by twine wrap, frozen feed blocks, or excessive loading that generates torque beyond design limits.<\/p>\n<\/div>\n<\/div>\n

\"PTO<\/p>\n

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Torque Limiter Type Comparison<\/h2>\n
\n\n\n\n\n\n\n\n\n
Feature<\/th>\nBall Detent<\/th>\nFriction Disc<\/th>\nShear Pin\/Bolt<\/th>\nRatchet (Pawl)<\/th>\nAutomatic (Cam)<\/th>\n<\/tr>\n
Torque Range<\/strong><\/td>\nLow\u2013Medium<\/td>\nMedium\u2013High<\/td>\nLow\u2013Very High<\/td>\nLow\u2013High<\/td>\nMedium\u2013High<\/td>\n<\/tr>\n
Speed Range<\/strong><\/td>\n540\u20131000 RPM<\/td>\n540\u20131000 RPM<\/td>\n540\u20131000 RPM<\/td>\n540\u20131000 RPM<\/td>\n540\u20131000 RPM<\/td>\n<\/tr>\n
Reset Method<\/strong><\/td>\nAutomatic<\/td>\nAutomatic (slip)<\/td>\nManual (replace bolt)<\/td>\nAutomatic (ratchet)<\/td>\nAutomatic (cam)<\/td>\n<\/tr>\n
Best Application<\/strong><\/td>\nLight implements<\/td>\nFrequent moderate overloads<\/td>\nInfrequent severe overloads<\/td>\nFrequent transient overloads<\/td>\nHigh-utilization, no consumables<\/td>\n<\/tr>\n
Consumable Parts<\/strong><\/td>\nNone<\/td>\nFriction linings (long life)<\/td>\nShear bolts<\/td>\nNone<\/td>\nNone<\/td>\n<\/tr>\n
Torque Precision<\/strong><\/td>\nModerate<\/td>\nGood (adjustable)<\/td>\nExcellent (bolt-grade calibrated)<\/td>\nGood<\/td>\nVery Good (adjustable)<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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Installation & Usage Guide<\/h2>\n
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Installation Steps<\/h3>\n

Step 1:<\/strong> Verify that the PTO shaft spline size matches the torque limiter spline specification (1 3\/8″ Z6, 1 3\/8″ Z6, 1 3\/4″ Z6). Clean all spline surfaces thoroughly.<\/p>\n

Step 2:<\/strong> Slide the torque limiter onto the PTO shaft spline, ensuring full engagement. Secure with the provided push pin kit or retaining hardware.<\/p>\n

Step 3:<\/strong> Connect the output side (yoke or splined shaft) to the implement input shaft or gearbox. Ensure proper alignment and secure all fasteners to the recommended torque.<\/p>\n

Step 4:<\/strong> Apply grease through the grease nipple to lubricate the spline interface and internal components. Use lithium-based EP grease (NLGI #2).<\/p>\n

Step 5:<\/strong> Perform a low-speed test run to verify correct engagement and smooth operation before full-power operation.<\/p>\n

Safety & Maintenance Tips<\/h3>\n

⚠ Always disengage the tractor PTO before inspecting or servicing the torque limiter.<\/p>\n

⚠ Use only genuine replacement parts specified for your series to maintain the correct torque rating.<\/p>\n

⚠ Re-grease spline connections every 8 operating hours or as specified in your equipment manual.<\/p>\n

⚠ Inspect for wear, cracks, or damage before each season. Replace worn components immediately.<\/p>\n

⚠ Never operate with damaged or missing PTO shaft safety shields.<\/p>\n<\/div>\n

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Selection Guide \u2014 Choosing the Right Model<\/h2>\n
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Selecting the correct torque limiter requires confirming the following parameters:<\/p>\n

✓ Required Torque Rating (Nm):<\/strong> Match the implement’s maximum operating torque plus a 20\u201330% safety margin.<\/p>\n

✓ PTO Shaft Spline Size:<\/strong> Commonly 1 3\/8″ Z6 (6-spline) or 1 3\/4″ Z6\/Z20. Verify both input and output spline requirements.<\/p>\n

✓ PTO Speed:<\/strong> Standard 540 RPM or economy 1000 RPM \u2014 confirm your implement’s requirement.<\/p>\n

✓ Connection Type:<\/strong> Yoke output for standard shaft tubes, splined shaft for inline assemblies, or flanged output for direct gearbox mounting.<\/p>\n

✓ Overload Frequency:<\/strong> Frequent overloads favor auto-reset types (ratchet, friction, automatic). Infrequent but severe overloads suit shear bolt types.<\/p>\n

✓ Environmental Conditions:<\/strong> Consider dust, moisture, temperature extremes. Sealed automatic and friction types offer superior protection in harsh environments.<\/p>\n

Need help choosing? Contact our engineering team<\/a> for personalized selection assistance.<\/p>\n<\/div>\n

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Quality Certification & Service Commitment<\/h2>\n
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✅<\/p>\n

ISO 9001:2015<\/p>\n

Certified quality management system ensuring consistent product excellence<\/p>\n<\/div>\n

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✅<\/p>\n

CE Marked<\/p>\n

Compliant with European safety, health, and environmental protection standards<\/p>\n<\/div>\n

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💪<\/p>\n

12-Month Warranty<\/p>\n

Full warranty against manufacturing defects under normal operating conditions<\/p>\n<\/div>\n

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🚚<\/p>\n

Global Shipping<\/p>\n

Fast worldwide delivery with professional export packaging and documentation<\/p>\n<\/div>\n<\/div>\n

\"PTO<\/p>\n

<\/p>\n

Frequently Asked Questions (FAQ)<\/h2>\n
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\nWhat torque rating do I need for my implement?<\/summary>\n
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The required torque rating depends on your implement’s maximum operating torque. As a general rule, select a torque limiter rated at 1.2 to 1.5 times the implement’s normal peak operating torque. Consult your implement manufacturer’s specifications or contact our engineering team for personalized guidance.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nHow do I know when the torque limiter has activated?<\/summary>\n
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Depending on the type: shear bolt limiters show a visibly sheared bolt; ratchet limiters produce a distinct clicking sound during slip; friction limiters emit a slight odor and sound during sustained slipping; automatic cam limiters produce a clicking sensation. In all cases, the implement stops receiving power while the PTO shaft continues turning.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nCan I adjust the torque setting?<\/summary>\n
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Friction-type and automatic (cam-type) torque limiters allow field adjustment of the torque setting by changing spring preload through bolt tension. Shear bolt types are set by the bolt grade and cannot be adjusted \u2014 different torque ratings require different bolt specifications. Ratchet types have a fixed setting determined by the number and spring rate of the pawls.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nWhat maintenance does the torque limiter require?<\/summary>\n
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Regular greasing through the grease nipple (every 8 operating hours), visual inspection for wear or damage before each season, and replacement of worn friction linings (friction types) or keeping spare shear bolts on hand (shear bolt types). Automatic and ratchet types require minimal maintenance beyond lubrication.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nIs this torque limiter compatible with my PTO shaft?<\/summary>\n
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This product uses standard 1 3\/8″ Z6, 1 3\/8″ Z6, 1 3\/4″ Z6 spline connections, which are compatible with the vast majority of agricultural PTO shafts worldwide. If your equipment uses a different spline configuration, we offer adapters and custom spline options. Contact us with your shaft specifications for confirmation.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nWhat is the difference between 540 RPM and 1000 RPM PTO?<\/summary>\n
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Standard PTO operates at 540 RPM and is used for most agricultural implements. Economy PTO (also called 1000 RPM PTO) is used for lighter implements to reduce engine RPM and fuel consumption. Our torque limiters are rated for both speeds. Select the spline size matching your PTO standard: typically 1 3\/8″ Z6 for 540 RPM and 1 3\/4″ Z20 for 1000 RPM.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nDo you offer OEM and private-label manufacturing?<\/summary>\n
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Yes, we provide full OEM manufacturing services including custom torque ratings, special spline configurations, custom markings, and private-label packaging. Minimum order quantities apply. Contact our sales team at the link below to discuss your requirements.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/div>\n

<\/p>\n

What Our Customers Say<\/h2>\n
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🇦🇺<\/span> James M.<\/strong> \u2014 Grain farmer, NSW, Australia<\/em><\/p>\n

“We fitted these torque limiters on all our header drives after losing a gearbox last harvest. They’ve triggered twice on hidden rocks and saved us thousands in repairs each time. Absolutely essential equipment for Australian broadacre farming.”<\/p>\n

★★★★★<\/p>\n<\/div>\n

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🇩🇪<\/span> Hans K.<\/strong> \u2014 Agricultural contractor, Bavaria, Germany<\/em><\/p>\n

“Excellent build quality \u2014 typical of what we expect for professional machinery. The torque ratings are accurate and the fit on our Walterscheid PTO shafts is perfect. We’ve standardized on these across our fleet.”<\/p>\n

★★★★★<\/p>\n<\/div>\n

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🇧🇷<\/span> Carlos S.<\/strong> \u2014 Sugarcane equipment dealer, São Paulo, Brazil<\/em><\/p>\n

“Reliable performance in extremely tough conditions. Brazilian sugarcane operations are brutal on drivelines, and these limiters consistently protect our customers’ equipment. Great value for the price.”<\/p>\n

★★★★★<\/p>\n<\/div>\n

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🇨🇦<\/span> Robert T.<\/strong> \u2014 Hay producer, Alberta, Canada<\/em><\/p>\n

“Running on our round balers through three seasons now without a single issue. The auto-reset feature is a huge advantage during busy harvest \u2014 no stopping to replace shear bolts when you hit a gopher mound.”<\/p>\n

★★★★★<\/p>\n<\/div>\n

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🇮🇳<\/span> Vikram P.<\/strong> \u2014 Farm equipment distributor, Punjab, India<\/em><\/p>\n

“Excellent product for the Indian market. Compatible with all major tractor brands including Mahindra, TAFE, and Sonalika. Our customers appreciate the reliability and competitive pricing.”<\/p>\n

★★★★★<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Related PTO Shaft Products & Accessories<\/h2>\n
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\n\"PTO<\/p>\n

PTO Shaft Components<\/p>\n

Complete range of PTO shaft yokes, cross bearings, tubes, shields, and adapters for all standard sizes.<\/p>\n

View PTO Shafts →<\/a><\/p>\n<\/div>\n

\n\"PTO<\/p>\n

Agricultural Gearboxes<\/p>\n

Matched gearboxes designed to work seamlessly with our PTO shafts and torque limiters.<\/p>\n

Explore Products →<\/a><\/p>\n<\/div>\n

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The SB\/SBT1 Series Shear Bolt Torque Limiter<\/strong> is a mechanical overload protection device designed for PTO drive shafts<\/strong> in agricultural and industrial machinery. It safeguards expensive gearboxes, implements, and tractor PTOs from catastrophic damage caused by sudden torque spikes, jamming, or overloading. When the preset torque threshold (570\u20134500 Nm) is exceeded, the calibrated shear bolt fractures cleanly, immediately disconnecting the driveline and preventing costly equipment failure and hazardous situations. This series stands out for its simple reset process<\/em> \u2014 just replace the shear bolt \u2014 and its precise, repeatable trip point<\/em>. With a 1 3\/8″ Z6 spline interface and a full range of torque ratings, the SB series fits virtually any standard PTO shaft application.<\/p>","protected":false},"featured_media":1675,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[5052],"product_tag":[5057,5061,5058,5062,5055,5060,5053,5056,5059,5054],"class_list":{"0":"post-1815","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-shear-bolt-torque-limiter","7":"product_tag-agricultural-pto-torque-limiter","8":"product_tag-farm-equipment-torque-limiter","9":"product_tag-pto-drive-shaft-shear-bolt-clutch","10":"product_tag-pto-driveline-safety-device","11":"product_tag-pto-shaft-safety-clutch","12":"product_tag-pto-shaft-shear-pin-coupling","13":"product_tag-pto-shear-bolt-torque-limiter","14":"product_tag-shear-pin-overload-protector","15":"product_tag-tractor-implement-overload-protection","16":"product_tag-tractor-pto-slip-clutch","18":"first","19":"instock","20":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/product\/1815","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/comments?post=1815"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/media\/1675"}],"wp:attachment":[{"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/media?parent=1815"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/product_brand?post=1815"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/product_cat?post=1815"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/limitertorque.com\/ta\/wp-json\/wp\/v2\/product_tag?post=1815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}