{"product_id":"bsp-brass-hex-lock-nuts-flange-pipe-fittings-tank-thread","title":"1 2\" 3 4\" 1\" BSP Brass Hex Lock Nuts Flange Pipe Fittings Tank Thread Connection","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBSP Brass Hex Lock Nuts with Flange — Reliable Tank \u0026amp; Pipe Thread Connection\u003c\/h2\u003e\n\u003cp\u003eWhen a leaking tank fitting or a loose pipe connection costs you time and materials, the fastener holding it all together matters. DIYers and trade professionals working on water tanks, irrigation manifolds, and plumbing assemblies need a lock nut that seats flush, grips firmly, and resists the vibration and pressure that loosen standard nuts over time. These BSP brass hex lock nuts with flange are built for exactly that job.\u003c\/p\u003e\n\u003cp\u003eEach nut is machined from solid brass and features a wide hexagonal flange base that distributes clamping load evenly across the mating surface. Available in three BSP thread sizes — 1\/2\" (approximately 15 mm nominal bore), 3\/4\" (approximately 20 mm nominal bore), and 1\" (approximately 25 mm nominal bore) — with across-flats dimensions typically ranging from 27 mm to 41 mm depending on size. Sold in flexible quantity packs from 1 PCS up to 80 PCS to match single-repair and bulk-project needs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include securing bulkhead fittings on water storage tanks, locking threaded pipe nipples in irrigation control boxes, and fastening tank outlet connections in rainwater harvesting systems — all situations where a standard hex nut without a flange would risk pull-through or uneven seating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for BSP (British Standard Pipe) parallel thread fittings. Confirm your existing fitting thread standard is BSP before ordering. Not interchangeable with NPT (National Pipe Taper) threads.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These BSP Brass Hex Lock Nuts\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eIntegrated Flange Base\u003c\/strong\u003e — The wide flange distributes clamping force across a larger contact area, reducing the risk of pull-through on thin tank walls and plastic fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🟡\u003c\/span\u003e\u003cstrong\u003eSolid Brass Construction\u003c\/strong\u003e — Machined from brass for corrosion resistance in water, mild chemical, and outdoor environments where steel fasteners would rust and seize.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eThree BSP Thread Sizes\u003c\/strong\u003e — 1\/2\", 3\/4\", and 1\" BSP to cover the most common pipe and tank fitting diameters used in residential and light commercial plumbing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order from 1 PCS for a single repair up to 80 PCS for bulk installation projects, with per-unit cost decreasing at higher quantities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eHex Drive for Standard Tools\u003c\/strong\u003e — Full hexagonal profile accepts standard open-end wrenches and adjustable spanners for controlled torque without slipping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cstrong\u003eSuited for Wet Environments\u003c\/strong\u003e — Brass resists dezincification and performs reliably in potable water, rainwater, and irrigation applications where long-term moisture exposure is expected.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — BSP Brass Hex Lock Nuts\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eBSP (British Standard Pipe) Parallel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Sizes\u003c\/th\u003e\n\u003ctd\u003e1\/2\" (DN15), 3\/4\" (DN20), 1\" (DN25)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNut Type\u003c\/th\u003e\n\u003ctd\u003eHex Lock Nut with Flange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHexagonal (open-end wrench compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAcross Flats (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Outer Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNut Height (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e1, 2, 3, 5, 8, 10, 15, 20, 25, 30, 40, 50, 80 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eTank bulkhead fittings, pipe thread connections, irrigation manifolds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between BSP and NPT threads — and does this nut fit NPT fittings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBSP (British Standard Pipe) and NPT (National Pipe Taper) are different thread standards with incompatible profiles and pitches. These nuts are machined to BSP parallel thread dimensions. They will not seal correctly on NPT fittings. Check your existing pipe or tank fitting for thread markings or measure the thread pitch before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich size should I choose for my tank outlet fitting?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the nut size to the nominal bore of your bulkhead or tank fitting: 1\/2\" BSP for 15 mm nominal bore fittings, 3\/4\" BSP for 20 mm, and 1\" BSP for 25 mm. If you are unsure, measure the outer diameter of the male thread on your fitting and compare it to BSP thread tables, or contact us to confirm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs brass suitable for potable (drinking) water applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass is widely used in plumbing for potable water systems. However, compliance with local drinking water regulations (such as NSF\/ANSI 61 in the US) depends on the specific alloy and application. If your project requires certified potable water components, verify the applicable standard with your local authority before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the flange damage a plastic tank wall when tightened?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe flange distributes clamping load over a wider area compared to a standard hex nut, which reduces point stress on plastic surfaces. For thin-walled plastic tanks, use a rubber or PTFE washer between the flange and the tank surface to protect the material and improve the seal. Do not overtighten — hand-tight plus a quarter turn with a wrench is typically sufficient for most tank fittings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces do I need for a typical tank installation?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA standard tank bulkhead fitting requires one lock nut per outlet. A rainwater tank with two outlets needs 2 PCS; an irrigation manifold with five connections needs 5 PCS. Order a few extra for future repairs. The 10 PCS and 15 PCS packs offer a good balance for small multi-outlet projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these nuts be used outdoors or in underground installations?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass performs well in outdoor and above-ground wet environments. For underground or continuously submerged installations, consider whether the specific soil chemistry or water chemistry in your area could affect brass over time. In most residential irrigation and rainwater applications, brass is a durable long-term choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need thread sealant (PTFE tape) when installing these nuts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBSP parallel threads do not seal on the thread form alone — they rely on a face seal (gasket or O-ring at the fitting shoulder). PTFE tape on the thread is not required for sealing but can help with assembly and disassembly. Ensure the mating fitting includes a sealing washer or O-ring for a watertight connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Size and Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"1\u00262\" \/ 1PCS","offer_id":52331371004178,"sku":"GLFBTXJGLBZSJ024168x1","price":4.07,"currency_code":"USD","in_stock":true},{"title":"1\u00262\" \/ 2PCS","offer_id":52331371036946,"sku":"GLFBTXJGLBZSJ024168x2","price":4.92,"currency_code":"USD","in_stock":true},{"title":"1\u00262\" \/ 3PCS","offer_id":52331371069714,"sku":"GLFBTXJGLBZSJ024168x3","price":5.79,"currency_code":"USD","in_stock":true},{"title":"1\u00262\" \/ 5PCS","offer_id":52331371102482,"sku":"GLFBTXJGLBZSJ024168x5","price":8.55,"currency_code":"USD","in_stock":true},{"title":"1\u00262\" \/ 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