{"product_id":"black-steel-compression-spring-long-305mm-small-springs-wire-diameter-0-3mm-3mm","title":"Black Steel Compression Spring Long 305mm Small Springs Wire Diameter 0.3mm-3mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eBlack Steel Compression Springs 305mm — Precision-Wound for Reliable Load Control\u003c\/h2\u003e\n    \u003cp\u003eWhen a project demands consistent spring force across a long stroke, undersized or mismatched springs cause premature failure, uneven load distribution, and costly rework. Engineers, hobbyists, and maintenance technicians who need a dependable black steel compression spring in a 305 mm (12 inch) length will find this range covers virtually every common wire diameter from 0.3 mm to 3 mm.\u003c\/p\u003e\n    \u003cp\u003eEach spring is wound from carbon steel wire with a black oxide or phosphate finish that provides a degree of surface protection against light moisture and handling wear. The body length is a consistent 305 mm (~12.0 in), with wire diameters spanning 0.3 mm (~0.012 in) to 3 mm (~0.118 in) and coil outer diameters ranging from approximately 3 mm to 40 mm depending on the selected variant. End types are closed and ground for flat seating.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY mechanical assemblies requiring long-travel compression springs, custom jigs and fixtures where a specific wire-diameter-to-coil-diameter ratio is needed, and light industrial maintenance applications such as valve return springs, drawer slides, and tensioning mechanisms.\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 general mechanical assemblies, DIY projects, and light industrial applications. Match wire diameter and outer diameter to your housing bore and mandrel dimensions. Not rated for high-temperature or corrosive environments without additional protection.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Black Steel Compression Springs\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n      \u003cstrong\u003e94 Size Variants\u003c\/strong\u003e\n      \u003cp\u003eWire diameters from 0.3 mm to 3 mm paired with coil outer diameters from 3 mm to 40 mm — all at a consistent 305 mm body length for long-stroke applications.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n      \u003cstrong\u003eClosed \u0026amp; Ground Ends\u003c\/strong\u003e\n      \u003cp\u003eFlat-ground end coils ensure perpendicular seating, reducing lateral buckling and improving load accuracy in guided spring assemblies.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cstrong\u003eBlack Oxide Finish\u003c\/strong\u003e\n      \u003cp\u003eThe dark surface treatment reduces bare-metal reflectivity, offers light corrosion inhibition during storage and handling, and suits applications where appearance matters.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\n      \u003cstrong\u003eCarbon Steel Construction\u003c\/strong\u003e\n      \u003cp\u003eCarbon steel wire delivers a good balance of tensile strength and elasticity for general-purpose compression duty across a wide range of loads.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cstrong\u003eConsistent 305 mm Body Length\u003c\/strong\u003e\n      \u003cp\u003eA standardised 305 mm (~12 in) free length makes these springs easy to cut-to-length or use as-is in long-travel mechanisms, drawer systems, and custom fixtures.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n      \u003cstrong\u003eWide Load Range Across Variants\u003c\/strong\u003e\n      \u003cp\u003eThinner wire (0.3–0.8 mm) suits light-duty return and tensioning tasks; heavier wire (1.5–3 mm) handles more substantial compression loads in mechanical assemblies.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Compression Springs\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBlack oxide \/ black phosphate\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBody Length\u003c\/th\u003e\n\u003ctd\u003e305 mm (~12.0 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWire Diameter Range\u003c\/th\u003e\n\u003ctd\u003e0.3 mm – 3 mm (0.012 in – 0.118 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\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\u003eClosed and ground\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSpring Direction\u003c\/th\u003e\n\u003ctd\u003eRight-hand wound\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\u003eMax Load\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eUp to approximately 120 °C (248 °F) for standard carbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eLight — suitable for dry\/indoor environments\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 for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eWire diameter determines the spring rate and maximum load capacity. Thinner wire (0.3–0.8 mm) produces softer springs suited to light return or tensioning tasks. Heavier wire (1.5–3 mm) creates stiffer springs for more substantial compression loads. Match the wire diameter to your required spring rate and the space available for the coil outer diameter.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat outer diameter should I select to fit my housing or mandrel?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor a housing (bore) fit, the spring outer diameter should be slightly smaller than the bore ID — typically 0.5–1 mm clearance. For a mandrel (rod) fit, the spring inner diameter should be slightly larger than the rod OD. Check the variant size label (wire Ø × coil OD × length) and calculate inner diameter as: OD − (2 × wire diameter).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these springs strong enough for mechanical assemblies?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel compression springs in the 1.5–3 mm wire diameter range are well suited to general mechanical assemblies including valve returns, drawer mechanisms, and tensioning systems. For safety-critical or high-cycle fatigue applications, consult a mechanical engineer and verify the spring rate and load data for your specific variant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these springs rust or corrode?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe black oxide finish provides light surface protection against handling and short-term storage in dry conditions. These springs are not rated for wet, outdoor, or chemically aggressive environments. For corrosive conditions, consider stainless steel springs or apply an additional protective coating after installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I cut these 305 mm springs to a shorter length?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the 305 mm body length is a common reason customers choose this range. You can cut carbon steel springs to a shorter free length using a rotary cutting tool or spring cutter. After cutting, the end coils will no longer be ground flat, so account for this in your design or dress the cut end as needed.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the spring rate for a specific variant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpring rate (k) can be estimated using the formula: k = (G × d⁴) \/ (8 × D³ × n), where G is the shear modulus of carbon steel (~79,000 MPa), d is wire diameter, D is mean coil diameter (OD − d), and n is the number of active coils. If you need the exact spring rate for a variant, contact us with the size and we can provide further data.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 0.3 mm and 3 mm wire diameter options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 0.3 mm wire diameter produces a very fine, soft spring ideal for delicate mechanisms such as small electronics, pen clips, or precision instruments. The 3 mm wire diameter produces a substantially stiffer spring capable of handling significant compressive loads in heavier mechanical assemblies. The 94 variants in between allow you to dial in the exact stiffness your project requires.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo you sell these springs in bulk quantities?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach listing is sold per individual spring. If you need larger quantities for a project or production run, please contact us directly — we can discuss volume options and ensure you receive consistent batch specifications.\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 and coil 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 wire diameter for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Wire diameter determines the spring rate and maximum load capacity. Thinner wire (0.3–0.8 mm) produces softer springs suited to light return or tensioning tasks. Heavier wire (1.5–3 mm) creates stiffer springs for more substantial compression loads. Match the wire diameter to your required spring rate and the space available for the coil outer diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What outer diameter should I select to fit my housing or mandrel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For a housing (bore) fit, the spring outer diameter should be slightly smaller than the bore ID — typically 0.5–1 mm clearance. For a mandrel (rod) fit, the spring inner diameter should be slightly larger than the rod OD. Check the variant size label and calculate inner diameter as: OD − (2 × wire diameter).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs strong enough for mechanical assemblies?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel compression springs in the 1.5–3 mm wire diameter range are well suited to general mechanical assemblies including valve returns, drawer mechanisms, and tensioning systems. For safety-critical or high-cycle fatigue applications, consult a mechanical engineer and verify the spring rate and load data for your specific variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these springs rust or corrode?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The black oxide finish provides light surface protection against handling and short-term storage in dry conditions. These springs are not rated for wet, outdoor, or chemically aggressive environments. For corrosive conditions, consider stainless steel springs or apply an additional protective coating after installation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I cut these 305 mm springs to a shorter length?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — the 305 mm body length is a common reason customers choose this range. You can cut carbon steel springs to a shorter free length using a rotary cutting tool or spring cutter. After cutting, the end coils will no longer be ground flat, so account for this in your design or dress the cut end as needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the spring rate for a specific variant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spring rate (k) can be estimated using the formula: k = (G × d⁴) \/ (8 × D³ × n), where G is the shear modulus of carbon steel (~79,000 MPa), d is wire diameter, D is mean coil diameter (OD − d), and n is the number of active coils.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 0.3 mm and 3 mm wire diameter options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 0.3 mm wire diameter produces a very fine, soft spring ideal for delicate mechanisms such as small electronics, pen clips, or precision instruments. The 3 mm wire diameter produces a substantially stiffer spring capable of handling significant compressive loads in heavier mechanical assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do you sell these springs in bulk quantities?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each listing is sold per individual spring. If you need larger quantities for a project or production run, please contact us directly — we can discuss volume options and ensure you receive consistent batch specifications.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.3 x 3 x 305 mm","offer_id":52448323797266,"sku":"BGM6760x1","price":4.87,"currency_code":"USD","in_stock":true},{"title":"0.4 x 4 x 305 mm","offer_id":52448323830034,"sku":"BGM6761x1","price":4.87,"currency_code":"USD","in_stock":true},{"title":"0.4 x 5 x 305 mm","offer_id":52448323862802,"sku":"BGM6762x1","price":5.03,"currency_code":"USD","in_stock":true},{"title":"0.5 x 3 x 305 mm","offer_id":52448323895570,"sku":"BGM6763x1","price":4.87,"currency_code":"USD","in_stock":true},{"title":"0.5 x 3.5 x 305 mm","offer_id":52448323928338,"sku":"BGM6764x1","price":4.87,"currency_code":"USD","in_stock":true},{"title":"0.5 x 4 x 305 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