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D-399D Compression spring is sold as a box of 12 pieces. The listed price is for the complete 12-piece box, not for a single spring.
Designed for specification-led purchasing, D-399D makes it easy to compare the spring rate, free length, and coil dimensions in one place.
Technical highlights include material: EN 10270-1, wire diameter: 8 mm, outer diameter: 81 mm, free length: 345 mm, spring rate: 7.946 N/mm. Use the specification table below to verify the dimensions and performance data against your application before placing an order.
- Pack size: 12 pieces per box
- Price basis: price shown is for one box containing 12 springs
- Product type: Compression spring
- Best for: maintenance, replacement, prototyping, and specification-led purchasing
Technical specifications
| Article number | D-399D |
|---|---|
| Material | EN 10270-1 |
| Spring ends | Closed and ground |
| Wire diameter [d] | 8 mm |
| Inner coil diameter [Di] | - mm |
| Mean coil diameter [D] | 73 mm |
| Outer coil diameter [De] | 81 mm |
| Maximum mandrel diameter [Dd] | 63.2 mm |
| Minimum housing diameter [Dh] | 83.4 mm |
| Free length [L0] | 345 mm |
| Buckling length [Lk] | mm |
| Max. static force [Fn] | 1562.981 N |
| Min. static length [Ln] | 148.29 mm |
| Max. static deflection [sn] | 196.71 mm |
| Max. dynamic force [Fndyn] | 1466.435 N |
| Min. dynamic length [Lndyn] | 160.44 mm |
| Max. dynamic stroke [shdyn] | 83.4 mm |
| Spring pitch [S] | 24.963 mm |
| Active coils [n] | 13.5 pc. |
| Total coils [nt] | - pc. |
| Spring rate [R] | 7.946 N/mm |
| Weight per spring | 1412.3903 g |
Please check all measurements carefully before ordering. Spring performance can vary depending on installation conditions and application requirements.