Technical Resources & Free Engineering Tools
Calculators, design guides and reference data for engineers buying springs and spring parts — built by CHENJI, free to use, no signup.
Free calculators
Compression Spring Calculator
Spring rate, spring index, Wahl factor, load, shear stress, pitch and solid height — metric or imperial.
Open calculatorContainer Loading Calculator
How many cartons or pallets fit a 20GP / 40GP / 40HQ container, with payload limits and CBM utilisation.
Open calculatorDesign & buying guides
- Compression spring design guide — rate, stress, buckling and end types
- Torsion spring design guide — moments, leg configurations, fatigue
- Extension springs guide — initial tension and hook types
- How to get a custom spring quote — what to send us for a fast quotation
- Spring steel materials guide — music wire, 60Si2Mn, 50CrV4, stainless
- Spring steel wire grades — grades, diameters and availability
- Spring heat treatment — hardening, tempering, stress relieving
- Shot peening for springs — improving fatigue life
- Spring fatigue life — cycles, stress ranges and testing
- Spring coatings guide — zinc, powder coat, e-coat, paint
- Spring standards by region — EN, DIN, ASTM, GB, JIS
- Garage door spring buying guide — cycles, sizing, replacement
- Disc springs guide — stacking, load curves, preload
- Railway fastening springs guide — rail clips and fastening systems
- Spring glossary — terms, units and symbols
Product pages
- All spring products — compression, extension, torsion, disc, railway, automotive
- Railway suspension springs · Compression springs · Torsion springs · Disc springs
- Applications — railway & transit, metro, mining, automotive, garage doors
Looking for something specific — a spring drawing, a load table or a material certificate? Email us and we will send the reference data with your quotation.
Need engineering support?
Send your drawing or working conditions — we reply with a design review and quotation within 24 hours.
Email: liu@chenjisprings.com · Phone / WhatsApp: +86 158 5311 1612
CHENJI — Jinan Chenji International Trade Co., Ltd. Compression, extension, torsion, disc and railway springs.