This model is basically the same as model NAST-R, but does not have an inner ring.
Since the circumference of the outer ring is spherically ground, it helps lighten a biased load (symbol R).

Model No. Main dimensions Basic load rating Detail specifications CAD Dimensional drawing Inner  diameter di Inscribed bore  diameter dr Outer  diameter D B C Dynamic rating C Static rating C0 2D (DXF) 3D mm mm mm mm mm kN kN RNAST 5R — 7 16 — 7.8 2.74 2.39 RNAST 6R — 10 19 — 9.8 4.12 4.55 RNAST 8R — 12 24 — 9.8 5.68 5.89 RNAST 10R — 14 30 — 11.8 9.7 9.67 RNAST 12R — 16 32 — 11.8 10.4 10.9 RNAST 15R — 20 35 — 11.8 12.3 14.3 RNAST 17R — 22 40 — 15.8 17.4 20.9 RNAST 20R — 25 47 — 15.8 19.2 24.5 RNAST 25R — 30 52 — 15.8 20.7 28.4 RNAST 30R — 38 62 — 19.8 30.3 45.4 RNAST 35R — 42 72 — 19.8 32.2 50.6 RNAST 40R — 50 80 — 19.8 35.7 61.6 RNAST 45R — 55 85 — 19.8 37.1 66.4 RNAST 50R — 60 90 — 19.8 38.7 71.8