Standards used for Extension Spring calculations
ANSI
| Designation | Description | Revision |
| A 229 / A –229M -99 | Standard Specification for Steel wire, oil tempered for Mechanical Springs. | Reapproved 2005 |
| A 313 / A 313M-03 | Standard Specification for stainless steel spring wire. |
ISO
| Designation | Description | Revision |
| ISO 6931-1 : 1989 | Stainless Steel for springs. Part 1 : Wire | |
| ISO/CD 8458-1 | Steel wires for Mechanical Springs. Part 1 : General Requirements | 1998 |
| ISO/CD 8458-3 | Steel wires for Mechanical Springs. Part 3 : Oil Hardened and Tempered steel wire | 1998 |
| PrEN 10270-2 | Steel wires for Mechanical Springs. Part 2 : Oil Hardened and Tempered steel wire of unalloyed steel | 1996 |
| PrEN 10270-3 | Steel wires for Mechanical Springs. Part 3 : Stainless spring steel wire | June 1996 |
DIN
| Designation | Description | Revision |
| DIN EN 13906–1 | Cylindrical helical springs made from round wire and bars- Calculation and design. Part 1 : Compression Springs | Supersedes DIN 2089-1 December 1984 edition |
| DIN EN 13906–1 | Cylindrical helical springs made from round wire and bars- Calculation and design. Part 2 : Extension Springs | Supersedes DIN 2089-2,December 1984 edition |
| DIN EN 10270–1 | Steel wire for Mechanical Springs. Part 1 : Patented cold drawn unalloyed spring steel wire | Supersedes DIN EN 12166 (April 1998 ) ,DIN EN 10218-2 (August 1996), DIN 2076DIN 17223-1 ( December 984) |
| DIN EN 10270–2 | Steel wires for Mechanical Springs. Part 2 : Oil Hardened and Tempered steel wire of unalloyed steel | Supersedes DIN 17223-1 ( Sept 1990) |
| DIN EN 10270–3 | Steel wires for Mechanical Springs. Part 3 : Stainless spring steel wire | Spersedes DIN 17224 ( Feb 1982) |
JIS
| Designation | Description | Revision |
| JIS B 2704 : 2000(JSMA/JSA) | Helical Compression and Extension Spring-Requirements for design, Performance test method. | Reapproved 2005 |
| JIS G 3560 | Oil tempered wire for mechanical springs. | 1994 |
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