--- title: SK+ url: "https://www.wittenstein-group.com/en-us/product/sk" date: 2026-02-12 modified: 2026-02-24 lastUpdated: 2026-04-13 --- # SK+ alpha Advanced Line Hypoid gearbox The low-backlash hypoid gearboxes with SP+-compatible output geometry. The SK+ gearboxes are not only suitable for a wide range of applications thanks to their high precision and efficiency, but also impress with their ability to combine output options. An optional planetary pre-stage can also be used to achieve particularly high drive speeds. See CAD data and configure product Downloads ![](https://www.wittenstein-group.com/typo3temp/assets/_processed_/b/6/csm_SK-PLUS-IMAGE_7bba58b4ea.webp) ### 3 – 100 Ratio ### 20 – 768 Nm Max. torque ### ≤ 4 arcmin Backlash [ Technical details ](#tech-details) [ Further information ](#further-info) [ Related products ](#related) [ Request consultation ](#consultation) ![](https://www.wittenstein-group.com/epim-fs/Wittenstein-Prod-static_content/usp/4-compact.svg) ###### Compactness The axially short, right-angled design enables even more compact machine concepts ![](https://www.wittenstein-group.com/epim-fs/Wittenstein-Prod-static_content/usp/45-1-flexible.svg) ###### Flexibility Broad modular system of variable (also rear) output connections and various gear ratio combinations ![](https://www.wittenstein-group.com/epim-fs/Wittenstein-Prod-static_content/usp/29-2-smoothRunning.svg) ###### Consistently smooth running Constant backlash and low operating noise over the entire gearbox service life - Configure product - Technical data - Available options - Downloads | Product type | | SK+ | |---|---|---| | Design | | MF | | Ratio | | 3 – 100 | | Number of sizes | | 5 | | Max. backlash c) | jt | ≤ 4 arcmin | | Max. torque | T2α | 20 – 768 Nm | | Max. input speed | n1Max | 7500 rpm | | Torsional rigidity | Ct21 | 79 Nm/arcmin | | Max. tilting moment | M2KMax | 3213 Nm | | c) In relation to reference sizes | | **Output shape** | | |---|---| | Smooth shaft | ✓ | | Shaft with key d) | ✓ | | Splined shaft (DIN 5480) | ✓ | | Output on both sides | ✓ | | **Input shape** | | | Motor-mounted | ✓ | | **Characteristic** | | | ATEX (2014/34/EU) a) | ✓ | | Food-grade lubrication a) b) | ✓ | | Corrosion-resistant a) b) | ✓ | | **System solutions** | | | Linear system (rack / pinion) | ✓ | | **Accessory** (for more information, see the relevant product pages) | | | Coupling | ✓ | | a) Performance reduction: Technical data available on request b) Please contact WITTENSTEIN alpha d) Performance reduction: For detailed sizing, please use our [cymex®](https://stage.wittenstein-group.com/de-de/produkt/cymex-5) design software | | Document name | Document type | Language | Downloads | |---|---|---|---| | ![SP+, TP+, HG+, SK+, SPK+, TK+, TPK+, SC+, SPC+, TPC+, VH+, VS+, VT+, DP+, HDP+](https://www.wittenstein-group.com/fileadmin/processed_epim_fs/pdf-thumbnails/ALPHA-ADVANCED-LINE-US-6cf47bafeb3e.webp "Catalog alpha Advanced Line") Catalog alpha Advanced Line SP+, TP+, HG+, SK+, SPK+, TK+, TPK+, SC+, SPC+, TPC+, VH+, VS+, VT+, DP+, HDP+ | Brochure /Catalog | American English | [ Download (23 KB) ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=4054&dl=1&st=1739&lg=0&token=c145ac5d2a8e69c6c7af0fa888c46994abcec8af)[ Open in viewer ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=4054&st=1739&lg=0&token=df51b1fd7b683172521b6ce48832020f7a70c176) | | ![SK+, SPK+](https://www.wittenstein-group.com/fileadmin/processed_epim_fs/pdf-thumbnails/ALPHA-ADVANCED-LINE-SK-SPK-6cdc7d4e7e5d.webp "Technical data / Dimension sheets SK+ / SPK+") Technical data / Dimension sheets SK+ / SPK+ SK+, SPK+ | Brochure /Catalog | Neutral | [ Download (2 KB) ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3242&dl=1&st=1739&lg=0&token=a2c1b789149e95cae883a551e5a4889159fb7b5c)[ Open in viewer ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3242&st=1739&lg=0&token=1265d2f2fb47c73edd869a443fe469f657d97427) | | ![Technical documents SK+ / SPK+ / SC+ / SPC+ / HG+](https://www.wittenstein-group.com/fileadmin/processed_epim_fs/pdf-thumbnails/OPERATING-MANUAL-SP-SK-SPK-SC-SPC-HG-ee7c654d1ca1.webp "alpha Advanced Line") alpha Advanced Line Technical documents SK+ / SPK+ / SC+ / SPC+ / HG+ | Operating manual | Neutral | [ Download (3 KB) ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3329&dl=1&st=1739&lg=0&token=dfd32b974290009b3f1d9ced50e87e526aff5cd2)[ Open in viewer ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3329&st=1739&lg=0&token=1889ff2810695fd4359af769b3250879cd990573) | | ![](https://www.wittenstein-group.com/fileadmin/processed_epim_fs/pdf-thumbnails/INFORMATION-SEALING-PLATE-190dba672cbe.webp "Sealing Plate") Sealing Plate | Operating manual | Neutral | [ Download (121 B) ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3293&dl=1&st=1739&lg=0&token=c3d69de968cae2150db287914e6e8f2b6fe59b02)[ Open in viewer ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3293&st=1739&lg=0&token=94da936c558ddf2b56f754082763bd13e3759ab7) | | ![Operating Manual SK+ ATEX](https://www.wittenstein-group.com/fileadmin/processed_epim_fs/pdf-thumbnails/OPERATING-MANUAL-HG-PLUS-ATEX-d79bb8ae4869.webp "alpha Advanced Line") alpha Advanced Line Operating Manual SK+ ATEX | Operating manual (ATEX) | Neutral | [ Download (3 KB) ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3310&dl=1&st=1739&lg=0&token=a92145057c17a1d9904dfe6889d528c64b654051)[ Open in viewer ](https://www.wittenstein-group.com/index.php?eID=dumpWittFile&t=f&f=3310&st=1739&lg=0&token=ae2e76f581e6a9971aa63f292a48a6cbaf7d6e3d) | | Ordering code / CAD data SK+ | CAD / CAE | Neutral | [ Open in viewer ](https://cad-point.wittenstein-group.com/GearDetails/SK+) | ![](https://www.wittenstein-group.com/fileadmin/_processed_/9/c/csm_logo-sculpture_e38190faf6.webp) Contact us ------------ Would you like to learn more about our solutions? We would be happy to advise you—personally, competently, and tailored to your requirements. [info@wittenstein-us.com](#) [ 1 630 540-5300 ](tel:16305405300) [ To the contact form ](https://www.wittenstein-group.com/en-us/contact-locations/contact) ![](https://www.wittenstein-group.com/fileadmin/_processed_/1/9/csm_sk-plus-main-image_60966d2895.webp) Tapered roller bearings for absorbing axial and radial forces Variable output connection, also reverse High-quality hypoid gearing for increased torque and smooth running Output SP+ compatible Metal bellows coupling on the input: length compensation to protect the motor bearing ### Wide range of output options ### Advanced Linear System with SK+ ### Corrosion-resistant design ### cynapse® & smart services ### Accessories ![](https://www.wittenstein-group.com/fileadmin/_processed_/6/3/csm_Hypoid_Abtriebsarten_tabmodul_b2cba36b34.webp) The diverse output options of hypoid gearboxes offer flexible options for application connection, from shafts to splined shafts to hollow shaft interfaces. ![](https://www.wittenstein-group.com/fileadmin/_processed_/b/2/csm_sk-plus-welle-stehend-8499-tabmodule_bfe9a71415.webp) The SK+ for coordinated pinion-rack systems for medium to high requirements. Typical areas of application in wood, plastic, and composite processing, in machining centers, or in automation. [Read more](https://www.wittenstein-group.com/en-us/product/advanced-linear-systems) ![](https://www.wittenstein-group.com/fileadmin/_processed_/1/5/csm_csm_winkelgetriebe-sk-plus-welle-hygiene-stehend-45grad-zentralsicht-m-20150511_Freigestellt_slider_f78a61022f.webp) alpha Advanced Line gearboxes with increased resistance and food-grade lubrication available. ![](https://www.wittenstein-group.com/fileadmin/_processed_/f/9/csm_cynapse-produkseite-element_slider_3783d47093.webp) With cynapse® and smart services, you can unleash the full potential of your drive system: sensor data is processed, visualized, and analyzed intelligently. Find out how the combination of gearboxes with cynapse® and our smart services can make your digital production faster, safer, and more efficient. [Read more](https://www.wittenstein-group.com/int-en/products/software-and-digitalization/cynapse-smart-services) ![](https://www.wittenstein-group.com/fileadmin/_processed_/b/1/csm_METALBELLOWS-COUPLING-IMAGE_TabModule_dd3f337064.webp) Optimize your value chain: Utilize the combination of gearboxes and accessories in a complete package to streamline your internal processes. Find the right metal bellows couplings for our products. [Read more](https://www.wittenstein-group.com/en-us/product/metal-bellows-couplings) Related products ------------------ ![](https://www.wittenstein-group.com/typo3temp/assets/_processed_/0/a/csm_HG-PLUS-IMAGE_d11c8bbd6f.webp)##### [ HG+](https://www.wittenstein-group.com/en-us/product/hg) alpha Advanced Line Ratio3 – 100Max. torque20 – 768 NmBacklash≤ 4 arcmin ![](https://www.wittenstein-group.com/typo3temp/assets/_processed_/4/6/csm_SPK-PLUS-IMAGE_58ef8bcad2.webp)##### [ SPK+](https://www.wittenstein-group.com/en-us/product/spk) alpha Advanced Line Ratio12 – 1000Max. torque80 – 5700 NmBacklash≤ 2 – 4 arcmin ![](https://www.wittenstein-group.com/typo3temp/assets/_processed_/f/f/csm_XPK-PLUS-IMAGE_b45ed74038.webp)##### [ XPK+](https://www.wittenstein-group.com/en-us/product/xpk) alpha Premium Line Ratio12 – 1000Max. torque80 – 2520 NmBacklash≤ 2 – 4 arcmin ![](https://www.wittenstein-group.com/typo3temp/assets/_processed_/9/8/csm_SC-PLUS-IMAGE_e9cdfbb0e2.webp)##### [ SC+](https://www.wittenstein-group.com/en-us/product/sc) alpha Advanced Line Ratio1 – 2Max. torque12 – 378 NmBacklash≤ 4 arcmin