{"product_id":"dodge-sd-qd-bushing-keyed-three-bolt-flanged-ductile-iron","title":"Dodge SD QD Bushing, Keyed, Three-Bolt Flanged, Ductile Iron","description":"\u003cp\u003eGenuine Dodge SD series QD bushings in ductile iron, supplied with keyseat. The SD sits one size below the SK in the QD range: a three-bolt flanged bushing rated 5,000 lb-in, with a 4 degree tapered bore that draws down onto the shaft as the three cap screws are tightened. It mounts and dismounts without a puller and holds the sheave concentric under load.\u003c\/p\u003e\n\u003cp\u003eThree stock bores are listed here: 1-3\/8 in. (Dodge 120378), 1-5\/8 in. (Dodge 120382) and 1-7\/8 in. (Dodge 120386). Pick the bore that matches your shaft.\u003c\/p\u003e\n\u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e Dodge SD, QD standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorque rating:\u003c\/strong\u003e 5,000 lb-in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware:\u003c\/strong\u003e three 1\/4-20 x 1-7\/8 in. cap screws, supplied with the bushing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation torque:\u003c\/strong\u003e 108 lb-in. Do not exceed it. Over-torquing a QD bushing cracks the sheave hub\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange outside diameter:\u003c\/strong\u003e 3.18 in.  |  \u003cstrong\u003eFlange thickness:\u003c\/strong\u003e 0.43 in.  |  \u003cstrong\u003eBolt circle:\u003c\/strong\u003e 2.69 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel diameter:\u003c\/strong\u003e 2.18 in.  |  \u003cstrong\u003eLength through bore:\u003c\/strong\u003e 1.81 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum hub diameter:\u003c\/strong\u003e 3.81 in. in class 30 cast iron, 3.50 in. in steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore range for the series:\u003c\/strong\u003e 1\/2 in. minimum. In ductile iron, 1-11\/16 in. maximum with a full keyway, 1-15\/16 in. with a shallow keyway, 2 in. unkeyed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTaper:\u003c\/strong\u003e 4 degrees. Mounts conventionally or reversed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e ductile iron\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBore, keyway and weight by size\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-3\/8 in. bore (120378):\u003c\/strong\u003e keyseat 5\/16 x 5\/32 in., 5\/16 in. square key. 1.50 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-5\/8 in. bore (120382):\u003c\/strong\u003e keyseat 3\/8 x 3\/16 in., 3\/8 in. square key. 1.29 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-7\/8 in. bore (120386):\u003c\/strong\u003e shallow keyseat 1\/2 x 1\/16 in., shaft keyseat 1\/2 x 1\/4 in., 1\/2 x 5\/16 in. key furnished with this size. 1.07 lb\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 1-7\/8 in. bore is past the SD series limit for a full keyway, so Dodge supplies it with a shallow keyseat and furnishes the matching key. That is correct for the part, not a catalog error, but it does mean the key is not standard square stock. Keep it with the bushing.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eSD bushings fit any sheave, sprocket, timing pulley or coupling hub bored for the SD QD size. They are \u003cstrong\u003enot\u003c\/strong\u003e interchangeable with the larger SK bushing, nor with the two-screw Type H bushing used in bushed fractional-horsepower sheaves. Check what your hub is bored for before ordering. SD is called SD by every major maker, so there is no cross-brand letter to translate.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eWipe the taper and the hub bore clean and dry. Do not use anti-seize, oil or any lubricant on the mating taper surfaces, which makes the bushing over-advance and crack the hub. Line up the keyways, start all three cap screws, then tighten them in rotation to 108 lb-in. Recheck after a few hours of running, and again after the first belt re-tension.\u003c\/p\u003e\n\u003cp\u003eQD is a registered trademark of Emerson Electric. Not sure which bushing your sheave takes? Send us the sheave part number or a photo of the hub and the Warthog Air Compressor Store team will confirm before you order.\u003c\/p\u003e","brand":"AirComParts","offers":[{"title":"1-3\/8 in. Bore (Dodge 120378)","offer_id":67649873608979,"sku":"J6225","price":43.39,"currency_code":"USD","in_stock":true},{"title":"1-5\/8 in. Bore (Dodge 120382)","offer_id":67649873641747,"sku":"J6226","price":43.39,"currency_code":"USD","in_stock":true},{"title":"1-7\/8 in. Bore (Dodge 120386)","offer_id":67649873674515,"sku":"J6227","price":43.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0825\/3141\/8387\/files\/baldor_dodge_117373_adffd389-337f-4eaf-8751-6c7d762b7c63.jpg?v=1791891345","url":"https:\/\/aircompressorstore.com\/products\/dodge-sd-qd-bushing-keyed-three-bolt-flanged-ductile-iron","provider":"Warthog Air Compressor Store","version":"1.0","type":"link"}