{"product_id":"compression-spring-black-spring-steel-pressure-spring-305mm","title":"Ø3\/4\/5\/6mm Compression Spring Black Spring Steel Pressure Spring Length:305mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eCompression Spring in Black Spring Steel — Reliable Pressure Control for DIY \u0026amp; Mechanical Projects\u003c\/h2\u003e\n    \u003cp\u003eWhen a machine component keeps losing tension or a DIY mechanism fails to return to position, the culprit is almost always an undersized or wrong-material compression spring. Engineers, makers, and workshop technicians who need a dependable compression spring in black spring steel will find this 305mm length option covers a wide range of load and travel requirements in a single purchase.\u003c\/p\u003e\n    \u003cp\u003eThese compression springs are manufactured from black-finished spring steel wire, available in wire diameters of 3 mm, 4 mm, 5 mm, and 6 mm (approximately 0.12–0.24 in). Outer diameters span 16–50 mm (0.63–1.97 in) depending on the wire diameter selected, and every piece is cut to a consistent 305 mm (12.0 in) length. The black surface treatment provides a degree of corrosion resistance suitable for indoor mechanical environments.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY automation jigs requiring repeatable return force, custom machinery pressure-relief assemblies, and educational robotics or lab equipment where a black spring steel pressure spring of known geometry is needed. The multi-piece quantity options (1, 2, 3, 5, or 10 pcs) make it straightforward to stock spares or prototype multiple configurations before committing to a final design.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Suitable for standard spring housings and guide rods sized to match the selected outer diameter. Verify bore\/housing clearance against the outer diameter and wire diameter before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Compression Springs\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eBlack Spring Steel Construction\u003c\/strong\u003e\u003cbr\u003eMade from carbon spring steel with a black surface finish, offering solid elasticity and fatigue resistance for repeated compression cycles in mechanical assemblies.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWide Size Matrix\u003c\/strong\u003e\u003cbr\u003eWire diameters 3 \/ 4 \/ 5 \/ 6 mm paired with outer diameters from 16 mm to 50 mm give you precise control over spring rate and travel — select the combination that matches your load spec.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eConsistent 305 mm Free Length\u003c\/strong\u003e\u003cbr\u003eAll springs share a uniform 305 mm (12.0 in) free length, making it easy to cut to a shorter working length or use as-is in longer guide channels.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eMulti-Quantity Packs\u003c\/strong\u003e\u003cbr\u003eAvailable in 1, 2, 3, 5, or 10-piece quantities per order so you can prototype with a single piece or stock a full set for production runs without overpaying.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eBlack Finish for Indoor Corrosion Resistance\u003c\/strong\u003e\u003cbr\u003eThe black oxide-style coating reduces surface oxidation in dry or low-humidity environments, extending service life compared to bare steel springs.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-icon\"\u003e🏭\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Application Range\u003c\/strong\u003e\u003cbr\u003eSuited for DIY automation, custom machinery, robotics, lab equipment, and general mechanical engineering projects that require a reliable black spring steel pressure spring.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Compression Spring\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon spring steel (black finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e3 mm \/ 4 mm \/ 5 mm \/ 6 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e16–50 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e305 mm (12.0 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eCompression (pressure spring)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCoil Direction\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSpring Rate\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eEnd Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 \/ 10 pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right wire diameter and outer diameter for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStart with the load (force) you need the spring to exert and the available space in your housing or guide rod. A larger wire diameter produces a stiffer spring with a higher spring rate, while a larger outer diameter increases the coil area. Match the outer diameter to your bore or housing clearance, leaving a small radial gap (typically 1–2 mm) to prevent binding. If you are unsure, order a 1-piece sample of two or three size combinations to test before committing to a larger quantity.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I cut the 305 mm spring to a shorter working length?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Spring steel can be cut with an angle grinder or abrasive cut-off wheel. After cutting, lightly grind the end coil flat so the spring seats evenly. Note that cutting changes the number of active coils and therefore the spring rate — the shorter the spring, the stiffer it becomes. Plan your cut length with this in mind.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these compression springs — what load can they handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity depends on the wire diameter, outer diameter, and the number of active coils remaining at your working length. Larger wire diameters (5 mm, 6 mm) handle significantly higher loads than the 3 mm variants. For precise load calculations, use the spring rate formula: F = k × x, where k is the spring constant and x is the deflection. Contact us with your specific requirements if you need load data for a particular size combination.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these springs corrosion-resistant? Can I use them outdoors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe black finish provides moderate protection against surface oxidation in dry or low-humidity indoor environments. For outdoor or high-moisture applications, we recommend applying a light coat of machine oil or grease, or considering stainless steel springs instead. These black spring steel pressure springs are best suited for sheltered mechanical assemblies.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these compatible with standard spring guide rods and housings?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided the guide rod diameter is smaller than the inner diameter of the spring (OD minus 2× wire diameter) and the housing bore is larger than the outer diameter. For example, a 3 mm wire \/ 16 mm OD spring has an approximate inner diameter of 10 mm — a guide rod up to ~9 mm will fit with clearance. Always verify dimensions against your specific assembly before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich size combination should I choose for a DIY automation or robotics project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor lightweight return mechanisms (small levers, latches, sensor arms), the 3 mm wire diameter options in OD 16–22 mm are a good starting point. For medium-duty actuators or heavier moving parts, 4–5 mm wire with OD 22–40 mm provides more force. Heavy-duty clamping or pressing fixtures typically benefit from the 5–6 mm wire options. Order a 1-piece sample first to validate fit and force before scaling up.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between buying 1 piece vs. a 10-piece pack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe per-unit price decreases as quantity increases, making multi-piece packs more economical for production runs or when you need spares on hand. A 1-piece order is ideal for prototyping or one-off repairs. The 10-piece pack is the most cost-effective option for workshop stock or batch builds.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your Wire Diameter, Outer Diameter, and Quantity above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right wire diameter and outer diameter for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Start with the load you need the spring to exert and the available space in your housing or guide rod. Match the outer diameter to your bore clearance, leaving a 1–2 mm radial gap. Order a 1-piece sample of two or three size combinations to test before committing to a larger quantity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I cut the 305 mm spring to a shorter working length?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Cut with an angle grinder or abrasive cut-off wheel, then grind the end coil flat. Note that cutting changes the number of active coils and increases the spring rate — the shorter the spring, the stiffer it becomes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these compression springs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity depends on wire diameter, outer diameter, and active coil count. Larger wire diameters handle higher loads. Use F = k × x for precise calculations, or contact us with your specific requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs corrosion-resistant? Can I use them outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The black finish provides moderate protection in dry indoor environments. For outdoor or high-moisture use, apply machine oil or grease, or consider stainless steel springs instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with standard spring guide rods and housings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided the guide rod diameter is smaller than the spring inner diameter (OD minus 2× wire diameter) and the housing bore is larger than the outer diameter. Always verify dimensions before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size combination should I choose for a DIY automation or robotics project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For lightweight return mechanisms, use 3 mm wire \/ OD 16–22 mm. For medium-duty actuators, use 4–5 mm wire \/ OD 22–40 mm. For heavy-duty clamping, use 5–6 mm wire options. Order a 1-piece sample first to validate fit and force.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between buying 1 piece vs. a 10-piece pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Per-unit price decreases with quantity. A 1-piece order is ideal for prototyping or one-off repairs. The 10-piece pack is the most cost-effective option for workshop stock or batch builds.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3 \/ 16 \/ 305mm \u0026 1","offer_id":52450717663506,"sku":"GLFBMWXGLBZSJ049941x1","price":5.79,"currency_code":"USD","in_stock":true},{"title":"3 \/ 16 \/ 305mm \u0026 2","offer_id":52450717696274,"sku":"GLFBMWXGLBZSJ049941x2","price":10.98,"currency_code":"USD","in_stock":true},{"title":"3 \/ 16 \/ 305mm \u0026 3","offer_id":52450717729042,"sku":"GLFBMWXGLBZSJ049941x3","price":16.16,"currency_code":"USD","in_stock":true},{"title":"3 \/ 16 \/ 305mm \u0026 5","offer_id":52450717761810,"sku":"GLFBMWXGLBZSJ049941x5","price":26.52,"currency_code":"USD","in_stock":true},{"title":"3 \/ 16 \/ 305mm \u0026 10","offer_id":52450717794578,"sku":"GLFBMWXGLBZSJ049941x10","price":52.41,"currency_code":"USD","in_stock":true},{"title":"3 \/ 18 \/ 305mm \u0026 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