{"product_id":"compression-spring-pressure-springs-wire-dia-4-5mm-od-20-80mm-length-300mm","title":"Compression Spring Pressure Springs, Wire Dia 4-5mm, OD 20-80mm, Length 300mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCompression Springs for DIY Automation — Reliable Pressure Control in Every Coil\u003c\/h2\u003e\n\u003cp\u003eWhen a project demands consistent return force — whether you're building a custom jig, repairing a mechanical assembly, or designing a motion-control fixture — finding the right compression spring in the right size shouldn't slow you down. These compression pressure springs are engineered for makers, small workshop operators, and engineering students who need a broad size selection without ordering from a catalog that takes weeks to arrive.\u003c\/p\u003e\n\u003cp\u003eEach spring is a helical compression spring wound from round steel wire. Wire diameters span 4 mm to 5 mm (approximately 0.157 in to 0.197 in), outer diameters range from 20 mm to 80 mm (approximately 0.79 in to 3.15 in), and the free length is 300 mm (approximately 11.81 in). The coil body is finished in a natural steel tone typical of cold-wound spring steel.\u003c\/p\u003e\n\u003cp\u003eThese compression springs suit a wide range of applications: providing return force in DIY linear actuators and pneumatic valve assemblies, acting as buffer elements in 3D-printer Z-axis leveling systems, and serving as load-bearing components in custom furniture hardware or mechanical linkage prototypes. Long-tail use cases include spring-loaded clamp mechanisms, robotics end-effector compliance, and educational physics demonstration rigs.\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 Note:\u003c\/strong\u003e Verify inner diameter clearance against your guide rod or housing bore before ordering. Wire diameter and outer diameter determine spring rate — select your variant carefully to match your load requirements.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Compression Pressure Springs\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Wire diameters from 4 mm to 5 mm and outer diameters from 20 mm to 80 mm cover a broad spectrum of force and clearance requirements in a single product listing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e300 mm Free Length\u003c\/strong\u003e — A generous 300 mm (11.81 in) free length allows the spring to be cut or used as-is, giving flexibility for both short-stroke and longer-travel applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eRound Wire Helical Construction\u003c\/strong\u003e — Cold-wound helical coil geometry delivers consistent spring rate along the compression axis, minimizing lateral buckling under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eVersatile Application Fit\u003c\/strong\u003e — Suitable for machinery guards, jig fixtures, valve return mechanisms, robotics compliance joints, and educational lab setups requiring repeatable elastic force.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eMultiple Variant Options\u003c\/strong\u003e — Choose your exact wire diameter × outer diameter combination from the variant selector to match your design spec without over-engineering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eSold Individually or in Sets\u003c\/strong\u003e — Available in 1-piece quantities so you can prototype with a single spring before committing to a larger build quantity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Compression Springs\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm \/ 4.5 mm \/ 5 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e20 mm – 80 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e300 mm (11.81 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoil Type\u003c\/th\u003e\n\u003ctd\u003eHelical compression, round wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSpring steel (cold-wound)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural steel\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 Order\u003c\/th\u003e\n\u003ctd\u003e1 Pcs (per variant selected)\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 outer diameter for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the inner diameter of your housing or the outer diameter of your guide rod. The spring's inner diameter (OD minus twice the wire diameter) must clear the guide rod with a small gap — typically 0.5–1 mm — to prevent binding. The spring's OD must fit inside the housing bore with similar clearance. Use the variant selector to pick the OD that satisfies both constraints.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 4 mm, 4.5 mm, and 5 mm wire diameter options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eWire diameter directly affects spring stiffness (spring rate) and load capacity. A thicker wire (5 mm) produces a stiffer spring that can carry more load before reaching solid height, while a thinner wire (4 mm) yields a softer spring suited to lighter loads and finer force control. Choose based on the force range your application requires.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these springs corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese springs are made from cold-wound spring steel with a natural steel finish. Spring steel offers good mechanical properties but is not inherently corrosion-resistant in wet or chemically aggressive environments. For outdoor or humid applications, consider applying a light coat of oil or grease, or contact us to confirm if a coated variant is available.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these springs in a 3D printer or CNC machine?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Compression springs in the 4–5 mm wire diameter range are commonly used in 3D printer bed-leveling assemblies, Z-axis anti-backlash mounts, and CNC router dust-shoe return mechanisms. Verify that the OD fits your existing spring pocket and that the free length (300 mm) can be compressed to your required working length without exceeding the solid height.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I determine if the spring rate is suitable for my load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpring rate (k) is calculated as the load divided by the deflection: k = F \/ x. Estimate the force your application needs at the working deflection, then compare to the spring's rated load at that compression. If you need a specific spring rate value, contact us with your wire diameter, OD, and free length selection and we can provide guidance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the solid height of these springs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSolid height depends on the number of active coils and the wire diameter. It varies by variant (wire diameter × OD combination). As a conservative estimate, solid height is typically the wire diameter multiplied by the total number of coils. Contact us to confirm the solid height for your specific variant before designing a mechanism with a hard stop.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I order a custom length or quantity?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe standard listing offers 300 mm free length in 1-piece quantities. If you need a different free length, a different quantity pack, or a bulk order for production use, please contact us through the store's contact page and we will advise on available options.\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 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 outer diameter for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the inner diameter of your housing or the outer diameter of your guide rod. The spring's inner diameter (OD minus twice the wire diameter) must clear the guide rod with a small gap — typically 0.5–1 mm — to prevent binding. The spring's OD must fit inside the housing bore with similar clearance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 4 mm, 4.5 mm, and 5 mm wire diameter options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Wire diameter directly affects spring stiffness (spring rate) and load capacity. A thicker wire (5 mm) produces a stiffer spring that can carry more load before reaching solid height, while a thinner wire (4 mm) yields a softer spring suited to lighter loads and finer force control.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These springs are made from cold-wound spring steel with a natural steel finish. Spring steel offers good mechanical properties but is not inherently corrosion-resistant in wet or chemically aggressive environments. For outdoor or humid applications, consider applying a light coat of oil or grease.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these springs in a 3D printer or CNC machine?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Compression springs in the 4–5 mm wire diameter range are commonly used in 3D printer bed-leveling assemblies, Z-axis anti-backlash mounts, and CNC router dust-shoe return mechanisms. Verify that the OD fits your existing spring pocket and that the free length (300 mm) can be compressed to your required working length.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I determine if the spring rate is suitable for my load?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spring rate (k) is calculated as the load divided by the deflection: k = F \/ x. Estimate the force your application needs at the working deflection, then compare to the spring's rated load at that compression.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the solid height of these springs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Solid height depends on the number of active coils and the wire diameter. It varies by variant. As a conservative estimate, solid height is typically the wire diameter multiplied by the total number of coils. Contact us to confirm for your specific variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I order a custom length or quantity?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The standard listing offers 300 mm free length in 1-piece quantities. If you need a different free length, a different quantity pack, or a bulk order, please contact us through the store's contact page.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"4mm x 20mm \/ 300mm \/ 1 Pcs","offer_id":52450712551698,"sku":"WBJHHZDATH000336x1","price":14.08,"currency_code":"USD","in_stock":true},{"title":"4mm x 21mm \/ 300mm \/ 1 Pcs","offer_id":52450712584466,"sku":"WBJHHZDATH000337x1","price":14.08,"currency_code":"USD","in_stock":true},{"title":"4mm x 22mm \/ 300mm \/ 1 Pcs","offer_id":52450712617234,"sku":"WBJHHZDATH000338x1","price":14.08,"currency_code":"USD","in_stock":true},{"title":"4mm x 23mm \/ 300mm \/ 1 Pcs","offer_id":52450712650002,"sku":"WBJHHZDATH000339x1","price":14.08,"currency_code":"USD","in_stock":true},{"title":"4mm x 24mm \/ 300mm \/ 1 Pcs","offer_id":52450712682770,"sku":"WBJHHZDATH000340x1","price":14.08,"currency_code":"USD","in_stock":true},{"title":"4mm x 25mm \/ 300mm \/ 1 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