{"title":"50 mm Roller Bearing Blocks (RBB 50)","description":"\u003cp\u003eThe RBB 50 is the smallest block in Seldén's roller bearing range. A 50 mm sheave rated to 750 kg safe working load, built for the loads that come and go rather than the ones that sit still. Where a ball bearing block starts to feel notchy under a loaded spinnaker sheet, the RBB 50 keeps turning, so the trimmer feels the sail and not the hardware.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDesigned for dynamic applications\u003c\/li\u003e\n  \u003cli\u003eMachined, black anodized aluminum cheeks and acetal roller bearings\u003c\/li\u003e\n  \u003cli\u003eAcetal ball bearings stabilize the sheave under side loads\u003c\/li\u003e\n  \u003cli\u003ePA washer insulates stainless from aluminum to prevent corrosion\u003c\/li\u003e\n  \u003cli\u003eD-shackle with Ø 5 mm body and pin\u003c\/li\u003e\n  \u003cli\u003eSafe working load 750 kg · breaking load 1,500 kg · max line 10 mm\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"50-mm-roller-bearing-block-single-swivel","title":"50 mm Roller Bearing Block - Single, Swivel","description":"\u003cp\u003eRBB50 \u003c\/p\u003e\u003cp\u003eSwiveling high-end single block with AISI316 shackle. \u003c\/p\u003e\u003cp\u003eFeaturing a 50 mm sheave, the RBB50 is a compact, high-performance block designed for demanding, dynamic applications such as spinnaker and gennaker sheets, barber haulers, self-tacking jibs, and other high-load control lines.\u003c\/p\u003e\u003cp\u003eThe RBB50 features machined, black anodized aluminium cheeks, Acetal ball bearings that absorb axial (side) loads, and Acetal roller bearings optimized for radial loads. This combination delivers smooth operation, high efficiency, and outstanding durability under load.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 750 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 1500 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 10 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Mast Inc","offers":[{"title":"Default Title","offer_id":64114527240569,"sku":"405-201-01R","price":142.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/8272\/6737\/files\/index_13c63a96-ea61-494f-aa87-4d037cac8156.jpg?v=1785417662"},{"product_id":"50-mm-roller-bearing-block-single-soft-attachment","title":"50 mm Roller Bearing Block - Single, Soft-attachment","description":"\u003cp\u003eRBB50 \u003c\/p\u003e\u003cp\u003eHigh-end soft-attachment block for tight and noiseless installations. \u003c\/p\u003e\u003cp\u003eFeaturing a 50 mm sheave, the RBB50 is a compact, high-performance block designed for demanding, dynamic applications such as spinnaker and gennaker sheets, barber haulers, self-tacking jibs, and other high-load control lines.\u003c\/p\u003e\u003cp\u003eThe RBB50 features machined, black anodized aluminium cheeks, Acetal ball bearings that absorb axial (side) loads, and Acetal roller bearings optimized for radial loads. This combination delivers smooth operation, high efficiency, and outstanding durability under load.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 750 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 1500 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 10 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Mast Inc","offers":[{"title":"Default Title","offer_id":64114527306105,"sku":"405-201-32R","price":142.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/8272\/6737\/files\/index_25ab9e5b-e414-4f25-88f6-37248dbbdd9a.jpg?v=1785417664"},{"product_id":"50-mm-roller-bearing-block-single-stand-up","title":"50 mm Roller Bearing Block - Single, Stand-Up","description":"\u003cp\u003eRBB50 -  Single Stand-up\u003c\/p\u003e\u003cp\u003eA rubber stand-up supports the block making it ideal for German sheeting, spinnaker sheets and runners.\u003c\/p\u003e\u003cp\u003eFeaturing a 50 mm sheave, the RBB50 is a compact, high-performance block designed for demanding, dynamic applications such as spinnaker and gennaker sheets, barber haulers, self-tacking jibs, and other high-load control lines.\u003c\/p\u003e\u003cp\u003eThe RBB50 features machined, black anodized aluminium cheeks, Acetal ball bearings that absorb axial (side) loads, and Acetal roller bearings optimized for radial loads. This combination delivers smooth operation, high efficiency, and outstanding durability under load.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eBlockType\u003c\/b\u003e: fixeD \u003cem\u003e\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eBreaking Load\u003c\/b\u003e: 1500 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eSafe working Load\u003c\/b\u003e: 750 \u003cem\u003ekg\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eSystem\u003c\/b\u003e: RBB50 \u003cem\u003e\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMax line size\u003c\/b\u003e: 10 \u003cem\u003emm\u003c\/em\u003e\u003cbr\u003e\u003cb\u003eMounting\u003c\/b\u003e: 4x M5 \u003cem\u003e\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Selden Mast Inc","offers":[{"title":"Default Title","offer_id":64114527928697,"sku":"405-201-35R","price":207.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/8272\/6737\/files\/index_d6791a16-7907-4459-9849-516d5be2f2a2.jpg?v=1785417666"}],"url":"https:\/\/shop-us.seldenmast.com\/collections\/50-mm-roller-bearing-blocks-rbb-50.oembed","provider":"Seldén Mast Inc","version":"1.0","type":"link"}