{"product_id":"castair-adjustable-belt-tensioner-base-for-7-5-10hp-motors-213d","title":"Castair Adjustable Belt Tensioner Base for 7.5-10HP Motors 213D","description":"\u003cp\u003eThe Castair 213D is an adjustable belt tensioner motor base for 7.5 HP and 10 HP air compressor motors using the 213T NEMA frame. This base allows quick belt tension adjustment without removing belt guards — a dual bolt design that locks the motor position after adjustment. If you are building or rebuilding a 7.5-10 HP Castair compressor system with a 213T-frame motor, this is the motor mount you need. At $138.91 for the loose base, it is sized and rated for motors in the 7.5-10 HP class.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 213D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Frame Compatibility:\u003c\/strong\u003e 213T (7.5 HP motors — specifically the 7-213-3 three-phase motor)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHP Range:\u003c\/strong\u003e 7.5 HP applications with 213T frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Loose base (motor not included) — see 213DM for pre-mounted version\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $138.91\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e213T vs. 215T Frame: Understanding the Difference\u003c\/h2\u003e\n\u003cp\u003eThis is one of the most common ordering mistakes for 7.5-10 HP compressor motors: Castair lists two different frames in this HP range.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e213T frame (7-213-3):\u003c\/strong\u003e 7.5 HP three-phase motor — uses the 213D\/213DM base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e215T frame (7-215-1 or 10-215-1\/10-215-3):\u003c\/strong\u003e 7.5 HP single-phase and 10 HP motors — uses the 215D\/215DM base\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 213T and 215T frames have different mounting bolt patterns and dimensions. They are not interchangeable. Check the NEMA frame designation on your motor nameplate before ordering the base. If you have the 7.5 HP three-phase motor (7-213-3, 213T frame, 130 lbs), you need the 213D. If you have any other 7.5 HP or the 10 HP motor (215T frame), you need the 215D.\u003c\/p\u003e\n\n\u003ch2\u003eHow the Adjustable Tensioner Works\u003c\/h2\u003e\n\u003cp\u003eThe 213D uses a slotted motor mounting design with two lock bolts. To adjust belt tension:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLoosen the two lock bolts slightly\u003c\/li\u003e\n\u003cli\u003eSlide the motor along the adjustment slot to increase or decrease belt tension\u003c\/li\u003e\n\u003cli\u003eCheck tension (approximately 1\/2\" deflection per foot of span under moderate finger pressure)\u003c\/li\u003e\n\u003cli\u003eTighten both lock bolts to lock position\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo belt guard removal required — this is the practical advantage over fixed-mount bases. On a working shop compressor, belt tension should be checked at every oil change and the ability to do that quickly without partial disassembly makes it more likely to actually happen.\u003c\/p\u003e\n\n\u003ch2\u003eCastair Motor Base Size Chart for Reference\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e184D \/ 184DM:\u003c\/strong\u003e 5 HP, 184T frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e213D \/ 213DM:\u003c\/strong\u003e 7.5 HP three-phase, 213T frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e215D \/ 215DM:\u003c\/strong\u003e 7.5 HP single-phase and 10 HP, 215T frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e254D \/ 254DM:\u003c\/strong\u003e 15 HP, 254T frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e256D:\u003c\/strong\u003e 20 HP, 256T frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e284D:\u003c\/strong\u003e 25-30 HP, 284T frame\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Castair 213D adjustable belt tensioner motor base\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: Motor not included. For motor-plus-base as a complete assembly, order the 213DM.\u003c\/p\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This vs. the 213DM\u003c\/h2\u003e\n\u003cp\u003eOrder the 213D loose base when you have an existing 213T-frame motor that is still serviceable and only the base needs replacement, or when you are sourcing components separately for a new build. Order the 213DM pre-mounted assembly when you need both the motor and the base, or when you want the alignment done at the factory rather than in the field. The price difference between the two reflects the motor cost and factory assembly.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eWe stock Castair motor bases in the complete HP range and can confirm the correct base for your specific motor frame before you order. We have been specializing in industrial air compressor components since 2016. Free shipping, free technical support at 866-217-0063, and full manufacturer warranty on all Castair components.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342501404885,"sku":"213D","price":255.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/Screenshot_27_c62e7886-e795-4653-9fca-a5e2a8e233cb.png?v=1772652461","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-adjustable-belt-tensioner-base-for-7-5-10hp-motors-213d","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}