{"id":453,"date":"2026-07-29T03:15:06","date_gmt":"2026-07-29T03:15:06","guid":{"rendered":"https:\/\/superiortransmissioninc.com\/?post_type=product&p=453"},"modified":"2026-07-29T03:37:48","modified_gmt":"2026-07-29T03:37:48","slug":"ep-41-ratio-50hp-540rpm-post-hole-digger-gearbox","status":"publish","type":"product","link":"https:\/\/superiortransmissioninc.com\/id\/produk\/ep-41-ratio-50hp-540rpm-post-hole-digger-gearbox\/","title":{"rendered":"EP-4:1 Ratio 50HP 540RPM Post Hole Digger Gearbox"},"content":{"rendered":"
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EP-4:1 Ratio 50HP 540RPM Post Hole Digger Gearbox<\/h2>\n

Model: EP-01-084 \u00a0|\u00a0 Ratio: 4:1 \u00a0|\u00a0 Power: 50HP \u00a0|\u00a0 Input: 540 RPM \u00a0|\u00a0 Weight: 44 Kg<\/p>\n

Engineered for demanding tractor-mounted post hole digger applications, the EP-01-084 is a heavy-duty PTO post hole digger gearbox built to deliver reliable torque conversion across a broad range of agricultural and land-clearing tasks. With a 4:1 gear ratio, 50HP power rating, and direct 1 3\/8″ Z6 spline input compatibility, this post hole auger gearbox is purpose-designed for contractors, farmers, and landowners operating in North America, Colombia, Australia, Southeast Asia, and beyond. Whether you are installing fence posts on rolling pasture, setting foundation anchors in compact soil, or boring holes for orchard tree planting, this pto post hole digger gearbox handles the job efficiently and with minimal operator effort. Its cast iron housing, precision-cut helical bevel gears, and heavy-duty output bearing configuration ensure sustained performance even under continuous-duty field conditions. The EP-01-084 is a popular choice for anyone sourcing a post hole digger gearbox replacement or upgrading an existing worn unit on a mid-to-large frame tractor.<\/p>\n<\/div>\n

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Technical Parameters \u2014 EP-01-084 Post Hole Digger Gearbox<\/h2>\n

The table below summarises the full specification of this post hole auger gear box. All data is taken directly from factory engineering drawings and reflects the production standard for this model. When sourcing a replacement post hole digger gearbox, matching these parameters to your existing auger drive specification ensures compatibility.<\/p>\n

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Post Hole Digger Gearbox\u00a0Parameter<\/th>\nSpecification<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Model \/ Item No.<\/td>\nEP-01-084<\/td>\nPost Hole Digger Series<\/td>\n<\/tr>\n
Gear Ratio<\/td>\n4:1<\/td>\nStandard 540 RPM PTO output \u2248 135 RPM auger speed<\/td>\n<\/tr>\n
Number of Teeth<\/td>\n11 \/ 44<\/td>\nPinion \/ Ring gear<\/td>\n<\/tr>\n
Module<\/td>\n5.0<\/td>\nISO gear module standard<\/td>\n<\/tr>\n
Rated Input Power<\/td>\n50 HP (37.3 kW)<\/td>\nAt rated input speed<\/td>\n<\/tr>\n
Rated Input Speed<\/td>\n540 RPM<\/td>\nStandard category I tractor PTO speed<\/td>\n<\/tr>\n
Rated Output Speed<\/td>\n135 RPM<\/td>\nCalculated (540 \u00f7 4)<\/td>\n<\/tr>\n
Input Shaft<\/td>\n1 3\/8″ Z6 Spline<\/td>\nFits standard Cat I \/ Cat II PTO shafts<\/td>\n<\/tr>\n
Output Type<\/td>\nOptic Axis (Straight Keyed Shaft)<\/td>\nAccepts standard auger hex \/ round adapters<\/td>\n<\/tr>\n
Gear Housing Material<\/td>\nDuctile Iron \/ Cast Iron<\/td>\nHigh-impact grade, machined bores<\/td>\n<\/tr>\n
Gear Material<\/td>\n20CrMnTi Alloy Steel<\/td>\nCarburised & hardened, HRC 58\u201362<\/td>\n<\/tr>\n
Net Weight<\/td>\n44 Kg<\/td>\nApprox. shipping weight: 48 Kg<\/td>\n<\/tr>\n
Lubrication<\/td>\nISO VG 220 Gear Oil<\/td>\nFill to sight glass; change every 500 hrs or annually<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-products-EP-41<\/p>\n

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Five Key Product Advantages<\/h2>\n
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\u2699 High-Torque 4:1 Reduction<\/strong><\/p>\n

The 4:1 gear ratio dramatically multiplies output torque from the tractor PTO, enabling the earth auger gearbox to cut through heavy clay, rocky subsoil, and compacted ground that would stall lesser units. This ratio is the industry sweet spot for tractor post hole digger applications using 540 RPM PTOs.<\/p>\n<\/div>\n

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\ud83d\udd28 50HP Rated Power Capacity<\/strong><\/p>\n

Rated at 50 horsepower, the EP-01-084 is matched to mid- and large-frame utility tractors commonly used on farms, construction sites, and rural properties across the US, Colombia, Australia, and Europe. This power ceiling provides a genuine safety buffer under peak-load boring conditions.<\/p>\n<\/div>\n

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\ud83d\udd12 Precision 11\/44 Gear Set<\/strong><\/p>\n

The 11-tooth drive pinion meshing with a 44-tooth driven gear, cut to Module 5.0 specification, ensures accurate ratio delivery, low vibration, and extended tooth-surface life. This precision-cut post hole digger gearbox gear set is heat-treated for surface hardness and fatigue resistance.<\/p>\n<\/div>\n

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\ud83d\udd04 Universal 1 3\/8″ Z6 Spline Input<\/strong><\/p>\n

The 1 3\/8″ Z6 spline input shaft is the global standard for 540 RPM tractor PTO connections. This universal interface means the EP-01-084 connects seamlessly to most tractor brands without special adapters \u2014 reducing downtime and making this pto auger gearbox an ideal drop-in replacement for worn OEM units.<\/p>\n<\/div>\n

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\ud83c\udf10 Global Compliance & ISO Certification<\/strong><\/p>\n

Manufactured under ISO 9001:2015 quality management systems, the post hole digger gearbox meets the dimensional and safety expectations of buyers in North America, the EU, Australia, Colombia, and South Korea. Full traceability and batch documentation are available on request for import compliance purposes.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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How the Post Hole Digger Gearbox Works<\/h2>\n

When your tractor’s power take-off (PTO) shaft engages, it rotates at 540 RPM and transmits that rotary motion directly into the 1 3\/8″ Z6 spline input of the EP-01-084 digger gearbox. Inside the sealed cast-iron housing, that high-speed rotation drives the 11-tooth pinion gear, which meshes with the larger 44-tooth driven gear at a 4:1 reduction ratio. This gear mesh converts high-speed, lower-torque input into slow-speed, high-torque output \u2014 the fundamental mechanical principle behind every effective tractor auger gearbox. The output shaft (optic axis configuration) then turns at approximately 135 RPM with substantially amplified torque, which is delivered to the auger bit drive connection.<\/p>\n

The gear set is bathed in ISO VG 220 gear oil that is splash-lubricated as gears rotate, keeping contact surfaces cool and protected from wear. Lip seals on both shafts prevent oil leakage and exclude soil, grit, and moisture \u2014 critical for a tool that operates directly at ground level. The result is a robust, mechanically efficient energy path from tractor engine to soil-cutting auger, capable of boring post holes continuously across a full working day without thermal overload.<\/p>\n<\/div>\n

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\"Gearbox<\/div>\n

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Material Composition & Construction Quality<\/h2>\n

The durability of any post hole gearbox comes down to the materials used in its construction \u2014 and the EP-01-084 leaves nothing to chance. The outer housing is cast from high-grade ductile iron or cast iron (depending on variant), selected for its excellent vibration damping and resistance to cracking under shock loads encountered when an auger strikes embedded rocks or root systems. The housing bores are precision-CNC-machined to tight tolerances so that all bearing seats and shaft alignments remain exact throughout the gearbox’s service life.<\/p>\n

The gear set itself is manufactured from 20CrMnTi chromium-manganese-titanium alloy steel \u2014 a material standard widely used in heavy-duty agricultural gearboxes for its outstanding case-hardening response. After machining to Module 5.0 tooth profile standards, both the pinion (11T) and the ring gear (44T) are carburised and case-hardened to HRC 58\u201362, producing a hard, wear-resistant surface over a tough, ductile core. This combination resists pitting and fatigue fracture under the cyclic loads that define field use. Shaft material is medium-carbon alloy steel, induction-hardened at journal surfaces and precision-ground to h6 fit for sealed bearing installation. All fasteners are grade 8.8 or higher. The unit leaves the line with oil pre-filled and sealed for immediate field deployment.<\/p>\n<\/div>\n

\"superiortransmissioninc-Post<\/p>\n

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Application Scenarios of Post Hole Digger Gearbox<\/h2>\n

The EP-01-084 post hole digger gearbox is a versatile drive component suitable for a wide range of land-use and construction-adjacent applications. Below are the primary use cases our customers report from the field.<\/p>\n

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\ud83c\udf3f Fence Post Installation<\/strong><\/p>\n

Farmers and livestock operators across Australia, Colombia, and the US use the tractor post hole digger with this gearbox to bore uniform-depth holes for woven wire, barbed wire, and electric fence systems. The 4:1 ratio provides controlled auger speed for consistent bore diameter in mixed-soil conditions.<\/p>\n<\/div>\n

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\ud83c\udf33 Orchard & Vineyard Planting<\/strong><\/p>\n

Tree nurseries and commercial orchards rely on the pto post hole digger gearbox to prepare planting holes for fruit trees, olive groves, and grapevine support posts in a fraction of the time manual digging would require, while avoiding soil compaction around the bore.<\/p>\n<\/div>\n

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\ud83c\udfd7 Signage & Light Pole Foundations<\/strong><\/p>\n

Contractors installing roadside signage, solar mounting poles, or rural lighting infrastructure use this earth auger gearbox to achieve precise bore depth in compacted ground and gravel substrates, reducing the need for concrete breaking equipment in greenfield sites.<\/p>\n<\/div>\n

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\ud83c\udfe0 Residential Deck & Pergola Posts<\/strong><\/p>\n

Smaller-scale contractors and owner-builders rent or own compact tractors with PTO and use the post hole auger gear box to set footings for decks, pergolas, and carports \u2014 particularly popular in rural residential properties across Canada, the UK, and regional Australia.<\/p>\n<\/div>\n

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\ud83d\uded2 Rental Equipment Fleets<\/strong><\/p>\n

Equipment hire businesses stock the EP-01-084 as a reliable post hole digger gearbox replacement unit because its universal 1 3\/8″ Z6 input fits the majority of rental tractors without modification, minimising downtime between hires and reducing the number of specialist adapters needed in the depot.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Regulatory Compliance by Region<\/h2>\n

Mechanical power transmission equipment \u2014 including this post hole digger gearbox \u2014 is subject to varying regional standards governing design, performance, and operator safety. Understanding which frameworks apply to your market helps streamline import and deployment.<\/p>\n

United States & Canada:<\/strong> PTO-driven agricultural equipment must comply with ASABE (American Society of Agricultural and Biological Engineers) Standard ASABE S207.14, which defines PTO shaft dimensions, guarding requirements, and safe operating speeds. OSHA 29 CFR 1928 agricultural safety standards require adequate PTO shielding when operating near personnel. The EP-01-084’s 1 3\/8″ Z6 spline interface directly conforms to ASABE PTO standards. In Canada, CGSB and provincial farm-safety acts such as Ontario’s Farms and Farm Workers Act impose similar shielding obligations on tractor-attached equipment.<\/p>\n

European Union:<\/strong> The EU Machinery Directive 2006\/42\/EC (and its successor, Machinery Regulation EU 2023\/1230 coming into force 2027) mandates CE marking, risk assessment documentation, and technical file preparation for power-transmission components placed on the EU market. EN ISO 4254-1 (Agricultural Machinery \u2014 Safety) and EN 1553 (Agricultural Self-Propelled Machinery) are the primary harmonised standards applicable to PTO-driven digger gearboxes. Distributors in Germany, the Netherlands, France, and other member states must ensure importation records accompany CE-compliant units.<\/p>\n

Australia & New Zealand:<\/strong> Safe Work Australia’s Code of Practice for Managing Risks of Plant in the Workplace, and the relevant state WHS Regulations, apply to tractor-mounted implements used on commercial properties. AS 1418 and associated machinery guarding standards set the framework for safe PTO-driven implement design in Australia. New Zealand’s Health and Safety at Work (General Risk and Workplace Management) Regulations 2016 impose parallel obligations.<\/p>\n

Colombia & Latin America:<\/strong> In Colombia, ICONTEC (Instituto Colombiano de Normas T\u00e9cnicas) standards and Resolution 90708 of the Ministry of Mines govern industrial equipment imports. For agricultural machinery, Decree 1071 (Agricultural Sector Regulatory Decree) and ICA (Instituto Colombiano Agropecuario) registration may apply to certain implement categories. Buyers sourcing a tractor post hole digger Colombia should verify current customs classification under the Andean Community’s NANDINA tariff system (subheading 8432 for agricultural machinery). Brazil’s ABNT NBR standards and Argentina’s IRAM standards are also relevant for distributors operating across the wider Latin American market.<\/p>\n

South Korea:<\/strong> Equipment imported into South Korea for agricultural use falls under the Rural Development Administration (RDA) certification framework and Korea’s Industrial Safety and Health Act (KOSHA). The Korean Agency for Technology and Standards (KATS) oversees relevant KS standards for gear units and agricultural machinery components.<\/p>\n<\/div>\n

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About the Manufacturer<\/h2>\n

With over a decade of focused experience in mechanical power transmission engineering, our production facility specialises in the design and manufacture of agricultural gearboxes, worm gear reducers, planetary gear drives, PTO shafts, hydraulic cylinders, precision gears, roller chains, and industrial motors. Our quality management system is certified to ISO 9001:2015, ensuring consistent production standards and full traceability for every batch of post hole digger gearbox units leaving the floor.<\/p>\n

Beyond standard catalogue products, our engineering team designs and produces custom industrial and agricultural gearbox assemblies across a full range of structural materials \u2014 including ductile iron, cast iron, cast steel, precision-cast steel, and cast aluminium \u2014 to suit specialist OEM and integrator requirements. We also manufacture gears, sprockets, worm gears, pulleys, worm shafts, and a broad range of standard and non-standard mechanical components, making us a genuine one-stop source for drivechain and powertrain hardware. Our production lines are equipped with CNC gear hobbing and grinding machines, CMM inspection centres, and gear contact ratio test rigs to verify every unit before it ships.<\/p>\n

Workshop<\/h3>\n
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Related Products & System Compatibility<\/h2>\n

The EP-01-084 post hole digger gearbox is designed to work as part of a complete drivetrain system. Pairing it with the correct PTO shaft and complementary agricultural gearboxes ensures maximum efficiency and longevity. We supply all components from a single facility \u2014 eliminating compatibility guesswork and simplifying after-sale service.<\/p>\n

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Poros PTO<\/strong><\/p>\n

A properly rated Poros PTO<\/a> is the critical link between your tractor’s output and the input spline of the post hole digger gearbox. We manufacture fully telescoping, cross-joint PTO shafts in multiple length and torque ratings to complement the EP-01-084 directly, ensuring balanced driveline angles and safe shielded operation.<\/p>\n

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

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Full-Range Agricultural Gearboxes<\/strong><\/p>\n

Beyond the post hole digger series, our full catalogue of Agricultural Gearboxes<\/a> covers rotary cutter gearboxes, flail mower gearboxes, fertiliser spreader drives, hay tedder drives, and more \u2014 all engineered to the same module and material standards as the EP-01-084. One supplier, complete system compatibility.<\/p>\n

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

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Frequently Asked Questions<\/h2>\n
\nQ1. What size tractor do I need to run a 50HP post hole digger gearbox with a 4:1 ratio on a 540 RPM PTO?<\/summary>\n
For a 50HP rated pto post hole digger gearbox like the EP-01-084, you need a tractor with at least 55\u201360 HP at the PTO (not just engine HP), operating a Category I 540 RPM PTO. Utility tractors in the 55\u201390 HP engine range are the typical match \u2014 common models from most major brands in that bracket will handle this gearbox without risk of PTO overload during normal soil conditions. For heavy clay or rocky ground, staying closer to the 70\u201390 HP engine range gives you a comfortable working buffer.<\/div>\n<\/details>\n
\nQ2. How often should I change the gear oil in a post hole digger gearbox used in Australian farm conditions?<\/summary>\n
In Australian conditions \u2014 which typically involve dry, dusty environments and high ambient temperatures \u2014 we recommend changing the ISO VG 220 gear oil every 500 operating hours or at least once per season, whichever comes first. After the first 50 hours of operation on a new or replacement post hole digger gearbox, do an initial oil change to flush any metal particles from the break-in period. Always inspect the lip seals and oil level before the start of each fencing or planting season.<\/div>\n<\/details>\n
\nQ3. Which post hole digger gearbox fits a standard Category I PTO shaft connection on a Colombian utility tractor?<\/summary>\n
The EP-01-084 uses a 1 3\/8″ Z6 spline input \u2014 which is the standard interface for Category I PTO shafts universally recognised across tractor brands sold in Colombia, including common brands such as Massey Ferguson, John Deere, and New Holland models in the 55\u201390 HP range. No special adapter is needed for most Colombian market tractors, making this an ideal direct post hole digger Colombia field replacement. Always confirm your PTO end yoke spline count matches 6-spline (Z6) before connection.<\/div>\n<\/details>\n
\nQ4. What are the most common signs that a tractor auger gearbox needs to be replaced rather than repaired?<\/summary>\n
Signs that your tractor auger gearbox is beyond repair typically include: persistent oil leaks that return after seal replacement; audible gear knock or grinding at operating speed indicating chipped or cracked teeth; severe input shaft play (more than 0.5 mm radial movement) indicating collapsed bearings; or a housing crack from rock-strike impact. In many cases the cost of parts plus labour for internal rebuild exceeds the cost of a direct replacement post hole digger gearbox, especially for units where the housing is damaged. A full earth auger gearbox replacement kit is often the more economical path.<\/div>\n<\/details>\n
\nQ5. Where can I source a reliable replacement post hole digger gearbox for a New Holland or Massey Ferguson tractor used in the UK or European Union?<\/summary>\n
The EP-01-084 post hole digger gearbox is designed to OEM-equivalent dimensional and performance standards and can serve as a direct-fit or bolt-on replacement for worn gearboxes on most PTO-driven earth auger assemblies used with New Holland, Massey Ferguson, Fendt, and similar European-market tractors. For EU buyers, the unit can be supplied with documentation supporting CE Machinery Directive compliance. We work directly with agricultural equipment distributors and importers across the UK, Netherlands, Germany, and France on replacement post hole digger gearbox supply arrangements.<\/div>\n<\/details>\n
\nQ6. How do I correctly mount and align a post hole auger gear box to ensure long-term performance in rocky terrain?<\/summary>\n
Correct mounting is critical for long service life in rocky ground conditions. The gearbox mount frame must be rigid enough to prevent flex at peak load \u2014 any frame flex creates misalignment between the PTO shaft and the gearbox input, accelerating seal and bearing wear. Ensure the PTO shaft operates within the recommended joint angle (maximum 15\u00b0 single-joint, 25\u00b0 double-joint). Torque all mounting bolts to manufacturer specification and re-check after the first 8 hours of operation. Use a shear bolt or torque limiter PTO shaft to protect the post hole digger gearbox internals from shock loads when the auger strikes embedded rocks or roots.<\/div>\n<\/details>\n<\/div>\n<\/div>\n

Editor: PXY<\/p>","protected":false},"excerpt":{"rendered":"

The EP-01-084 Post Hole Digger Gearbox is engineered for heavy-duty earth auger applications, delivering robust performance with a 50 HP power rating. It features a precise 4:1 gear ratio utilizing an 11\/44 tooth configuration and a 5.0 module to ensure efficient torque multiplication. Designed for standard tractor PTOs, it accepts a rated input speed of 540 RPM via a 1 3\/8″ Z6 spline shaft. The unit outputs power through an optic axis connection, optimized for reliable digging operations. Weighing 44 kg, this gearbox combines durability with compact efficiency, making it an ideal replacement or upgrade component for agricultural machinery requiring consistent high-torque output in demanding soil conditions.<\/p>","protected":false},"featured_media":454,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[26],"product_tag":[],"class_list":["post-453","product","type-product","status-publish","has-post-thumbnail","product_cat-post-hole-digger-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/product\/453","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/media\/454"}],"wp:attachment":[{"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/media?parent=453"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/product_brand?post=453"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/product_cat?post=453"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/id\/wp-json\/wp\/v2\/product_tag?post=453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}