{"product_id":"254-x-146-ub43-s355j0-steel-beam-rsj-cut-to-size","title":"254 x 146 UB43 S355J0 Steel Beam RSJ – Cut to Size","description":"\u003ch2\u003e254 x 146 x 43 kg\/m Universal Beam (RSJ) – Heavy S355J0 Structural Steel\u003c\/h2\u003e\n\u003cp\u003eThe 254 x 146 UB43 is the heaviest section in the 254 x 146 universal beam family — a structural I-beam (commonly referred to as an RSJ, rolled steel joist) supplied in grade S355J0 to BS EN 10025-2 and cut to your required length. With a 259.6 mm depth, 147.3 mm flange width, 12.7 mm flange thickness and a 43.0 kg\/m linear weight, this beam is the workhorse RSJ for long domestic wall openings, larger kitchen-diner reconfigurations, garage door spans, and light commercial spans where the lighter UB31 or UB37 is undersized.\u003c\/p\u003e\n\u003cp\u003eOften searched as \"RSJ\", \"RSJ beam\", \"I-beam\" or \"H-beam\", the 254 x 146 UB43 is one of the most specified mid-size structural beams in UK domestic and light commercial construction.\u003c\/p\u003e\n\u003ch2\u003eBeam Specifications – 254 x 146 x 43 UB\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesignation:\u003c\/strong\u003e 254 x 146 x 43 UB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso known as:\u003c\/strong\u003e 254x146 RSJ, 254 I-beam, 254 H-beam\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinear weight:\u003c\/strong\u003e 43.0 kg\/m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel grade:\u003c\/strong\u003e S355J0 (BS EN 10025-2)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection depth (h):\u003c\/strong\u003e 259.6 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection width (b):\u003c\/strong\u003e 147.3 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb thickness (tw):\u003c\/strong\u003e 7.2 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange thickness (tf):\u003c\/strong\u003e 12.7 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoot radius (r):\u003c\/strong\u003e 7.6 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-sectional area:\u003c\/strong\u003e 54.8 cm²\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Plain mill finish\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut-to-size:\u003c\/strong\u003e 1m to 12m\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Specify the 254 x 146 UB43?\u003c\/h2\u003e\n\u003cp\u003eThe 254 x 146 UB family is the most common size of universal beam used as a structural RSJ on UK domestic projects, and the UB43 is the heaviest of the three (alongside the UB31 and UB37). It is specified where the structural engineer's calculation requires more capacity than the lighter siblings can deliver — for example a longer-than-typical kitchen-diner opening, a wall removal supporting first-floor and roof loads above, a larger garage door lintel, or a beam carrying point loads from a column reaction above. The UB43 fits the same wall thickness envelope as the UB31 and UB37, so it can be specified as a heavier upgrade without needing to redesign the surrounding masonry detail.\u003c\/p\u003e\n\u003ch2\u003eRSJ Cut to Length\u003c\/h2\u003e\n\u003cp\u003eOrder to any cut length between 1 and 12 metres. The beam is sawn square on a precision cold saw before dispatch — no on-site cutting, no offcut waste, and no risk of overheating the steel during cutting. Specify the exact length your structural engineer has called out on the calculation, plus any bearing allowance.\u003c\/p\u003e\n\u003ch2\u003eDelivery and Padstones\u003c\/h2\u003e\n\u003cp\u003eUK mainland delivery in 5–10 working days on a flat-bed lorry. A 5m length of UB43 weighs around 215 kg — offloading is the customer's responsibility and requires mechanical assistance. Note: padstones (concrete or engineering brick bearings to spread the beam load onto the supporting masonry below) must be specified separately by your structural engineer and are not supplied with the beam.\u003c\/p\u003e","brand":"Rackerman","offers":[{"title":"1.0m","offer_id":58223348646275,"sku":null,"price":126.36,"currency_code":"GBP","in_stock":true},{"title":"2.0m","offer_id":58223348973955,"sku":null,"price":237.12,"currency_code":"GBP","in_stock":true},{"title":"3.0m","offer_id":58223349301635,"sku":null,"price":347.86,"currency_code":"GBP","in_stock":true},{"title":"4.0m","offer_id":58223349629315,"sku":null,"price":458.64,"currency_code":"GBP","in_stock":true},{"title":"5.0m","offer_id":58223349956995,"sku":null,"price":569.4,"currency_code":"GBP","in_stock":true},{"title":"6.0m","offer_id":58223350284675,"sku":null,"price":680.16,"currency_code":"GBP","in_stock":true},{"title":"7.0m","offer_id":58223350612355,"sku":null,"price":790.92,"currency_code":"GBP","in_stock":true},{"title":"8.0m","offer_id":58223350940035,"sku":null,"price":901.68,"currency_code":"GBP","in_stock":true},{"title":"9.0m","offer_id":58223351267715,"sku":null,"price":1012.44,"currency_code":"GBP","in_stock":true},{"title":"10.0m","offer_id":58223351595395,"sku":null,"price":1123.2,"currency_code":"GBP","in_stock":true},{"title":"11m","offer_id":58223352316291,"sku":null,"price":1233.94,"currency_code":"GBP","in_stock":true},{"title":"12m","offer_id":58223352349059,"sku":null,"price":1344.72,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/1710\/6429\/files\/ChatGPTImageMay23_2026_06_50_22AM_75a43d07-e215-4160-9eaa-cccf5b8ec811.png?v=1779535270","url":"https:\/\/rackerman.co.uk\/products\/254-x-146-ub43-s355j0-steel-beam-rsj-cut-to-size","provider":"Rackerman","version":"1.0","type":"link"}