Your Cart
D-389A-21 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.
A compact metric compression spring for precise replacement, repair, and design work where part number D-389A-21 is the required match.
Technical highlights include material: EN 10270-1, wire diameter: 6.3 mm, outer diameter: 37.8 mm, free length: 150 mm, spring rate: 41.076 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-389A-21 |
|---|---|
| Material | EN 10270-1 |
| Spring ends | Closed and ground |
| Wire diameter [d] | 6.3 mm |
| Inner coil diameter [Di] | - mm |
| Mean coil diameter [D] | 31.5 mm |
| Outer coil diameter [De] | 37.8 mm |
| Maximum mandrel diameter [Dd] | 24.1 mm |
| Minimum housing diameter [Dh] | 39.1 mm |
| Free length [L0] | 150 mm |
| Buckling length [Lk] | mm |
| Max. static force [Fn] | 1964.331 N |
| Min. static length [Ln] | 102.18 mm |
| Max. static deflection [sn] | 47.82 mm |
| Max. dynamic force [Fndyn] | 1741.622 N |
| Min. dynamic length [Lndyn] | 107.6 mm |
| Max. dynamic stroke [shdyn] | 19.29 mm |
| Spring pitch [S] | 11.496 mm |
| Active coils [n] | 12.5 pc. |
| Total coils [nt] | - pc. |
| Spring rate [R] | 41.076 N/mm |
| Weight per spring | 353.5736 g |
Please check all measurements carefully before ordering. Spring performance can vary depending on installation conditions and application requirements.