I have posted a few threads about my clutch slipping. I got it fixed. the new set of springs I put in did not hold the power/torque (no need to argue what is actually is... it wasn't holding, not it is).

So while doing some research, I found out some information. Springs are rated in "N" ratings
The HD website shows these 2 springs for every year bike from 2017 to 2026

HD SE 37000288
Milwaukee-Eight Engine Clutch Springs - 1200N

HD SE 37000286
Milwaukee-Eight Engine Clutch Springs - 1275N

2017 - 2026 both can use the 1200N and 1275N Springs

If you

>The N rating (or N/mm) for springs represents the spring rate, indicating the stiffness or force (in Newtons) required to compress or extend a spring by one millimeter (N/mm)
If you but the complete set:

Replacement clutch springs for the Screamin’ Eagle® High Capacity Clutch Kit P/N 37000287.
Kit contains 10 fiber clutch plates (one more than Original Equipment), 10 contact plates, and 3-1200 Newton clutch springs

Installation of these springs with Original Equipment clutch plates will increase clutch capacity and lever effort
Can be installed without removing the outer primary cover
Kit includes three 1200 Newton (N) coiled clutch springs


Designed to complement the Screamin' Eagle® High Capacity Plate Kit P/N 37000258
Installation will increase capacity and lever effort
When combined with the High Capacity Clutch Plate Kit, torque is increased to the maximum level available
Can be installed without removing the outer primary cover
Kits includes three 1275 Newton (N) coil springs


2017 Clutch seat 37000219
springs 37000270
37000258 clutch disc kit
37000034 SPRING, damper
37000036 SEAT, damper-spring
*********************
2019 seat 37000219
springs 37000270A
37000258 clutch disc kit
37000034 Spring , damper
37000295 Seat, damper-spring
***********************
2020 seat 37000219
springs 37000270A
37000258 clutch disc kit
37000034 Spring , damper
37000295 Seat, damper-spring
*************************
2023 seat 37000219
springs 37000270A
37000258 clutch disc kit
37000034 Spring , damper
37000295 Seat, damper-spring

FWIW...

 

For reference:

 

Thank you for the informative post.

 

One thing to note. 1200 newtons is 270 lbs of force. I doubt it's 1200N / mm. Also I doubt it's one spring but all of them at a preset height. So 1275 is 287 lbs.