Trampoline Replacement Springs and Bolts: Repair Questions Answered

Quick answer

Match replacement springs by free length and coil diameter, and bolts by thread size and length. For many Skywalker models, that means a 3.5 inch spring with a 20 mm diameter or an M6x85mm bolt, but always confirm against your original part before ordering.

Common trampoline repair questions

How do I measure a trampoline replacement spring?

Remove an intact spring and measure its free length from hook end to hook end, then measure the outside coil diameter. Compare both numbers to the replacement listing. A 3.5 inch spring with a 20 mm diameter is one common size, but do not assume it fits your frame without measuring. Measure an original spring before ordering; trampoline size alone is not enough.

When should I replace trampoline springs?

Replace springs when they are visibly stretched compared with neighbors, have bent hooks, show heavy rust, or when the mat no longer returns to a flat, firm surface after bouncing. Replace in full sets or matched rows rather than mixing old and new springs, which can create uneven tension. Uneven tension is a sign to replace a whole row, not just one spring.

What does an M6x85mm bolt fit on a trampoline?

An M6x85mm bolt is a metric fastener with a 6 mm thread diameter and 85 mm length. It is used on some Skywalker frame joints, but not all. Check your frame's original bolt or parts list before ordering; if the original is a different length or thread, this bolt is not a substitute. Confirm thread size and length against the original bolt before ordering.

Can I replace just one broken spring?

You can replace one spring temporarily, but if the others are the same age, they are likely stretched similarly. Mixing one new spring with old ones can cause uneven mat tension. Replace the broken spring and inspect its neighbors; if several look stretched, replace the full set. A single new spring among old ones can create a tension imbalance.

Do I need to replace bolts when I replace springs?

Not always. Inspect frame bolts for rust, bent shafts, or damaged threads each time you change springs. Replace any bolt that shows these signs. If the frame wobbles after tightening, a worn bolt may be the cause rather than the springs. Check bolts during every spring replacement; they are a common source of wobble.

Product facts

• 3.5" Spring - 20mm Diameter - Qty 6: Sold as a set of 6 galvanized steel springs, each 3.5 inches long with a 20 mm diameter. Lets you replace a full row of worn springs at once with a known size, rather than guessing from the trampoline's overall dimensions.

  

• M6x85mm Bolt - Qty4: M6x85mm bolt, sold in a pack of 4, as a genuine Skywalker component. Provides a correct-length frame fastener for models that use this size, so you can fix a wobbly joint without hunting for a matching bolt.