{"id":1323,"date":"2026-07-17T05:45:55","date_gmt":"2026-07-17T05:45:55","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&p=1323"},"modified":"2026-07-17T05:56:46","modified_gmt":"2026-07-17T05:56:46","slug":"nb300r-series-right-angle-gearbox","status":"publish","type":"product","link":"https:\/\/metalite.net\/th\/product\/nb300r-series-right-angle-gearbox\/","title":{"rendered":"NB300R Series Right Angle Gearbox \u2014 Spiral Bevel Planetary Drive, 1,000\u2013500,000 Nm"},"content":{"rendered":"

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NB300R Series \u00b7 Spiral Bevel Planetary<\/p>\n

NB300R Series Right Angle Gearbox \u2014 Spiral Bevel Planetary Drive, 1,000\u2013500,000 Nm<\/h2>\n

The NB300R Series is a right angle drive gearbox<\/strong> built around a spiral bevel input stage combined with multi-stage planetary reduction. The result is a compact unit that redirects drive by 90\u00b0 while delivering output torques from 1,000 Nm (NB300R) up to 500,000 Nm (NB321R) \u2014 all within the same bolt-circle family. With up to 150 kW of transmissible mechanical power and gear ratios spanning 6.9 to 9,000, this agricultural right angle gearbox<\/strong> line covers fixed industrial plant, heavy mobile machinery, and high-cycle automated drives without needing an external bevel stage. Modular input configurations \u2014 IEC\/NEMA flanges, axial-piston hydraulic motors, orbit motors, and solid shafts \u2014 mean it integrates directly into existing drivetrains.<\/p>\n<\/div>\n

\"NB300R<\/p>\n

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150 kW<\/p>\n

Max Power<\/p>\n<\/div>\n

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500,000 Nm<\/p>\n

Peak Torque<\/p>\n<\/div>\n

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6.9\u20139,000<\/p>\n

Gear Ratio Range<\/p>\n<\/div>\n

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16 Sizes<\/p>\n

NB300R \u2192 NB321R<\/p>\n<\/div>\n<\/div>\n

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Right Angle Gearbox Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Series Designation<\/td>\nNB300R through NB321R (16 frame sizes)<\/td>\n<\/tr>\n
Gear Unit Configuration<\/td>\nRight angle \u2014 spiral bevel input + planetary reduction stages<\/td>\n<\/tr>\n
Output Torque Range<\/td>\n1,000 Nm (NB300R) to 500,000 Nm (NB321R)<\/strong><\/td>\n<\/tr>\n
Transmissible Power<\/td>\nUp to 150 kW<\/td>\n<\/tr>\n
Gear Ratio Range<\/td>\n6.9 \u2013 9,000<\/td>\n<\/tr>\n
Stage Variants<\/td>\nR2 (2-stage) \u00b7 R3 (3-stage) \u00b7 R4 (4-stage)<\/td>\n<\/tr>\n
Input Configurations<\/td>\nFlanged axial-piston hydraulic motor \u00b7 Orbit motor \u00b7 IEC & NEMA adaptors \u00b7 Solid input shaft<\/td>\n<\/tr>\n
Cross-Reference (NBPG)<\/td>\nNB300R, NB301R, NB303R, NB305R, NB306R, NB307R, NB309R\u2013NB321R<\/td>\n<\/tr>\n
Bevel Stage Type<\/td>\nSpiral bevel (low noise, high contact ratio)<\/td>\n<\/tr>\n
Installation<\/td>\nFoot mount \u00b7 Flange mount \u00b7 Hollow shaft with shrink disc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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NB300R Series Right Angle Drive Gearbox \u2014 Full Torque Range<\/h2>\n

All 16 frame sizes share the same right-angle spiral bevel architecture. Stage count (R2 \/ R3 \/ R4) determines the final ratio within each frame.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Series<\/th>\nModels Available<\/th>\nRated Torque (Nm)<\/th>\n<\/tr>\n<\/thead>\n
NB300R<\/td>\nNB300R2 \u00b7 NB300R3 \u00b7 NB300R4<\/td>\n1,000<\/td>\n<\/tr>\n
NB301R<\/td>\nNB301R2 \u00b7 NB301R3 \u00b7 NB301R4<\/td>\n1,750<\/td>\n<\/tr>\n
NB303R<\/td>\nNB303R2 \u00b7 NB303R3 \u00b7 NB303R4<\/td>\n2,500<\/td>\n<\/tr>\n
NB305R<\/td>\nNB305R2 \u00b7 NB305R3 \u00b7 NB305R4<\/td>\n5,000<\/td>\n<\/tr>\n
NB306R<\/td>\nNB306R2 \u00b7 NB306R3 \u00b7 NB306R4<\/td>\n8,500<\/td>\n<\/tr>\n
NB307R<\/td>\nNB307R2 \u00b7 NB307R3 \u00b7 NB307R4<\/td>\n12,500<\/td>\n<\/tr>\n
NB309R<\/td>\nNB309R2 \u00b7 NB309R3 \u00b7 NB309R4<\/td>\n18,000<\/td>\n<\/tr>\n
NB310R<\/td>\nNB310R2 \u00b7 NB310R3 \u00b7 NB310R4<\/td>\n25,000<\/td>\n<\/tr>\n
NB311R<\/td>\nNB311R2 \u00b7 NB311R3 \u00b7 NB311R4<\/td>\n40,000<\/td>\n<\/tr>\n
NB313R<\/td>\nNB313R2 \u00b7 NB313R3 \u00b7 NB313R4<\/td>\n55,000<\/td>\n<\/tr>\n
NB315R<\/td>\nNB315R3 \u00b7 NB315R4<\/td>\n100,000<\/td>\n<\/tr>\n
NB316R<\/td>\nNB316R3 \u00b7 NB316R4<\/td>\n135,000<\/td>\n<\/tr>\n
NB317R<\/td>\nNB317R3 \u00b7 NB317R4<\/td>\n170,000<\/td>\n<\/tr>\n
NB318R<\/td>\nNB318R4<\/td>\n250,000<\/td>\n<\/tr>\n
NB319R<\/td>\nNB319R4<\/td>\n350,000<\/td>\n<\/tr>\n
NB321R<\/td>\nNB321R4<\/td>\n500,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Key Features of the NB300R Heavy Duty Right Angle Gearbox<\/h2>\n
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  • \u2192<\/span>
    \nSpiral bevel 90\u00b0 input stage<\/strong> \u2014 higher contact ratio than straight-cut bevel gears, reducing noise by up to 6 dB and increasing tooth strength under shock load in this heavy duty right angle gearbox<\/strong> design.<\/li>\n
  • \u2192<\/span>
    \nTorque range 1,000 \u2013 500,000 Nm across 16 frames<\/strong> \u2014 all sizes share a common mounting philosophy, so moving up or down the range requires no new machine interface design.<\/li>\n
  • \u2192<\/span>
    \nGear ratios 6.9 to 9,000 in one product family<\/strong> \u2014 R2, R3, and R4 stage variants deliver the exact output RPM without a secondary gearbox, keeping the drivetrain shorter and lighter.<\/li>\n
  • \u2192<\/span>
    \nUniversal input compatibility<\/strong> \u2014 IEC B5\/B14 and NEMA C-face adaptors, axial-piston hydraulic motors, orbit motors, and plain solid shafts all fit without custom machining.<\/li>\n
  • \u2192<\/span>
    \nSuitable as a right angle gearbox for lawn mower and compact agricultural drives<\/strong> \u2014 the lower frame sizes (NB300R to NB305R, 1,000\u20135,000 Nm) fit mid-size tractor and mower deck configurations with no adapter plate.<\/li>\n
  • \u2192<\/span>
    \nSealed for outdoor and wash-down environments<\/strong> \u2014 double-lip seals on input and output shafts; IP65-equivalent protection on the bevel housing prevents ingress during field operation.<\/li>\n
  • \u2192<\/span>
    \nReduced total cost of ownership<\/strong> \u2014 modular design means worn planet carriers or bevel sets are field-replaceable without scrapping the housing, cutting repair cost by 40\u201360% vs. competitors with welded or bonded housings.<\/li>\n<\/ul>\n

    \"Applications<\/p>\n

    Applications for the NB300R Agricultural Right Angle Gearbox<\/h2>\n
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    Agricultural Drives<\/p>\n

    PTO-driven mowers, rotary tillers, spreaders, and fodder mixers. The compact bevel-planetary layout fits inside existing PTO housings with standard 1-3\/8\u2033 or 1-3\/4\u2033 spline interfaces.<\/p>\n<\/div>\n

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    Marine & Winch<\/p>\n

    Deck winches, anchor drives, and aquaculture feeding systems where a 90\u00b0 drive change at the drum is required and the unit must resist salt-spray for 10,000+ operating hours.<\/p>\n<\/div>\n

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    Construction Equipment<\/p>\n

    Concrete mixer drums, slewing rings on mini-excavators, and road-planer head drives \u2014 all applications where torque peaks to 2\u00d7 rated value during material break-in.<\/p>\n<\/div>\n

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    Industrial Conveyors<\/p>\n

    Cross-belt sorters, 90\u00b0 transfer conveyors, and screw feeders where the motor cannot be aligned axially with the output shaft.<\/p>\n<\/div>\n

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    Lawn & Turf Machinery<\/p>\n

    Large-area ride-on mowers and golf-course fairway cutters where a right angle gearbox for lawn mower applications must fit within a 200 mm vertical envelope.<\/p>\n<\/div>\n<\/div>\n

    <\/p>\n

    How to Calculate the Gear Ratio of the NB300R Right Angle Gearbox<\/h2>\n

    The NB300R combines a fixed-ratio bevel stage with a variable-stage planetary section. The total ratio is the product of both:<\/p>\n

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    Total ratio (i)<\/span> = ibevel<\/sub> \u00d7 iplanetary<\/sub><\/p>\n

    iplanetary<\/sub> = 1 + (Zring<\/sub> \/ Zsun<\/sub>) \u2190 per planetary stage<\/span><\/p>\n

    Multi-stage:<\/span> itotal planetary<\/sub> = istage1<\/sub> \u00d7 istage2<\/sub> \u00d7 istage3<\/sub><\/p>\n<\/div>\n

    Worked example \u2014 NB307R3:<\/strong> Bevel ratio 2:1 \u00d7 three planetary stages of 5:1 each = 2 \u00d7 5 \u00d7 5 \u00d7 5 = 250:1 total<\/strong>. With a 1,450 RPM motor input, output speed = 1,450 \u00f7 250 = 5.8 RPM<\/strong>.<\/p>\n

    Finding the required ratio:<\/strong> Divide your motor RPM by the target output RPM. If you need 3 RPM from a 1,450 RPM motor: 1,450 \u00f7 3 \u2248 483:1 \u2014 an NB307R3 or NB309R3 in a high-ratio configuration will cover this.<\/p>\n

    Share your motor speed, required output RPM, and peak torque demand with us and we will confirm the exact model and stage count within 24 hours.<\/p>\n

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    Right Angle Gearbox Repair: Rebuild or Replace?<\/h2>\n

    The modular NB300R design makes targeted repairs practical. Use this decision guide before ordering a full replacement unit:<\/p>\n