A 2-1/2in spring Coilover Spring Rated at 300lbs/in
QA1 part number QAP12CS300 is a 2-1/2in inside-diameter coilover spring, 12in long, rated at 300lbs/in, finished in Chrome Plated. QA1 manufactures its coilover springs from chrome-silicon steel with careful heat treating and post-processing for consistent rate and long fatigue life, per the manufacturer’s product description.
This is a universal coilover spring sized by inside diameter, free length and spring rate rather than tied to a specific vehicle. Confirm the shock body’s coilover thread and the spring perch’s inside diameter match this spring before ordering.
Key Features
- 2-1/2in inside diameter, 12in free length, 300lbs/in spring rate
- Chrome Plated finish
- Chrome-silicon alloy spring wire, cold wound, heat treated and shot peened per QA1
- Squared and ground ends for straight, consistent operation
- QA1 states its springs are lifetime guaranteed to remain within 2% of original free height and rate under normal operating conditions
Fitment
| Years | Make | Model | Notes |
|---|---|---|---|
| n.a. | n.a. | n.a. | Universal coilover spring sized by inside diameter, length and rate rather than by vehicle; no make, model or year is published for this part. |
Confirm the shock body and perch dimensions against this spring’s 2-1/2in ID and 12in length before ordering.
Specifications
| Detail | Value |
|---|---|
| Brand | QA1 |
| Inside diameter | 2-1/2in |
| Free length | 12in |
| Spring rate | 300lbs/in |
| Finish | Chrome Plated |
| Material | Chrome-silicon alloy spring wire |
| Warranty | Lifetime guarantee to remain within 2% of original free height and rate under normal operating conditions, per QA1 |
What’s Included
- One QA1 2-1/2in ID coilover spring, 12in length, 300lbs/in rate, Chrome Plated finish.
About QA1
QA1 manufactures its coilover springs from chrome-silicon alloy wire in the USA, using cold winding, heat treating and shot peening for consistency, and grinds both ends square for accurate, repeatable operation.
FAQ
What inside diameter does this spring use?
2-1/2in.
What is the free length of this spring?
12in.
What spring rate is this spring rated at?
300lbs/in, per QA1’s part number and title.
What finish does this spring have?
Chrome Plated.
Is this a vehicle-specific spring?
No. It is a universal coilover spring sized by inside diameter, length and rate; confirm those dimensions against the shock body and perch before ordering.
What warranty does QA1 offer on this spring?
QA1 states its springs are lifetime guaranteed to remain within 2% of the original free height and rate under normal operating conditions.
Can this spring be compressed to coil-bind without affecting rate?
QA1’s product description states its coil design allows compression to coil-bind without affecting spring rate or free height.
Is the spring rate and length marked on the spring?
Yes. QA1 states all its springs are clearly marked with free length and spring rate for identification.
Installation Instructions
QA1 does not publish a vehicle-specific installation procedure for this spring; use standard coilover spring-compression practice and the shock manufacturer’s ride-height guidance.
- Confirm the shock body’s coilover thread and the spring perch’s inside diameter match this spring’s 2-1/2in ID.
- Measure available install length against this spring’s 12in free length before compressing it onto the shock.
- Use a spring compressor to safely compress the spring onto the shock body and perch.
- Thread the adjuster ring to the ride height specified for the vehicle or setup being tuned.
- Verify the spring seats squarely on both ends before releasing the compressor.
- Cycle the suspension through its travel and check for coil-bind clearance before returning to service.
