Accossato open steering stem nut SA001 for Yamaha R1, black version⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandAccossato
TypeSteering stem nut, open
Part numberSA001
ThreadM28x1
MaterialAluminium, anodised
ColoursBlack, silver, titanium, red, blue, gold, green
Pieces per box1
FitmentYamaha R1 (1998–2019)
Road approvalNone documented, track use only
CheckCompare with the original part before ordering
DescriptionThe whole story▼

Few road-going motorcycles have as long a production run as the Yamaha R1, and Accossato lists this open steering stem nut across nearly the whole of it, from the earliest 1998 model through to 2019. Thread M28x1, machined from aluminium and anodised, it holds the top yoke down against the steering stem, a fitting that sits in full view once the R1's screen and clip-ons are in place.

Key Features

  • Open steering stem nut for the Yamaha R1, 1998 to 2019
  • One nut per pack
  • Thread M28x1
  • CNC-machined aluminium, anodised
  • Seven colours: blue, green, black, red, silver, titanium, gold
  • Holds the top yoke on the steering stem
  • No German ABE on file; for track use

Construction and Material Quality

Accossato cuts this nut from a block of aluminium on CNC equipment and anodises the finished shape, a process that works the chosen colour into the metal rather than coating it from outside. Left open at the centre, the nut shows the tip of the steering stem once it is wound into place, unlike the closed alternative Accossato also lists. The thread is specified as M28x1 for the R1, and Accossato states the part is compatible with the applications it names, with the job of clamping the top yoke to the steering stem.

A Detail Above the Clip-Ons

On a supersport machine like the R1, the top yoke sits close to where a rider's hands rest on the clip-ons, which puts the steering stem nut almost directly in view every time the bike is wheeled out or parked up after a ride. Because the R1 has been built across so many years, the part has stayed in demand well beyond any single generation of the bike, fitted as happily to an early model as to a later one. Work at the steering head should always follow the motorcycle's own workshop manual for torque and adjustment rather than guesswork.

Fitment and Compatibility

Accossato's listing for the Yamaha R1 spans 1998 to 2019 for this open nut, thread M28x1. A closed version for the same headstock carries code SC001, and the same bike is also where Accossato lists mirror block-off covers, code MC009.

Road Approval

No German ABE or type-approval paperwork is on file for this nut, so it is listed for racing and competition use rather than for road registration.

Scope of Delivery

The pack contains one open steering stem nut in the single colour selected at the time of ordering.

Specifications

  • Type: Steering stem nut, open
  • Part number: SA001
  • Thread: M28x1
  • Material: Aluminium, anodised
  • Colours: Black, silver, titanium, red, blue, gold, green
  • Pieces per box: 1
  • Fitment: Yamaha R1 (1998–2019)
  • Road approval: None documented, track use only
  • Check: Compare with the original part before ordering
What's includedEverything in the box▼
  • 1x Accossato open steering stem nut
FitmentWhich bikes this fits▼
  • Yamaha R1 (1998–2019)
  • BMW S1000RR (2009–2017)
  • Kawasaki NINJA H2 (2018–2019)
  • Kawasaki ZX-10 R (2004–2019)
  • Kawasaki ZX-6R (2005–2019)
  • Suzuki GSX-R 1000 (2005–2019)
  • Suzuki GSX-R 600 (2006–2017)
  • Suzuki GSX-R 750 (2006–2017)
  • Suzuki GSX-S1000 (2015–2018)
  • Yamaha FZ8 (2010–2016)
  • Yamaha MT-10 (2016–2019)
  • Yamaha R1M (2015–2019)
  • Yamaha R6 (2006–2017)
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