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ZSM-021
Display Units: inches  |  metric
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Ring Specs
(D) Free Diameter: 19.99 +0.00 / -0.33 mm.
(t) Thickness: 0.81 +0.05 / -0.05 mm.
(b) Radial Wall: 1.65 +0.08 / -0.13 mm.
Groove Specs:
(B) Application Diameter: 21.0 mm.
(G) Groove Diameter: 20.14 +0.10 / -0.00 mm.
(W) Groove Width: 0.91 +0.08 / -0.00 mm.
Groove Depth: 0.43 mm.
Other Specs
Approximate Weight per 1000:
(m) Material Thickness:0.38mm.
(N) Ring Number of Turns:2.000
(Pg) Theoretical Thrust Load Capacity - Groove Yield:
Notes: Yield Strength of Groove Material (Ys): 310 MPa. Calculated using a safety factor (K) of 2

Equation:
Pg = [ B * d * Ys * pi ] / K
    = [ (21.01 mm.) * (0.43 mm.) * (310 MPa) * 3.14 ] / 2		4,417N
(Pr) Theoretical Thrust Load Capacity - Ring Shear:
Notes: Ring Material: Carbon Spring Steel (SAE 1070-1090). Shear Strength of Ring Material (Ss): 952 MPa. Calculated using a safety factor (K) of 3

Equation:
Pr = [ B * t * Ss * pi ] / K
    = [ (21.01 mm.) * (0.81 mm.) * (952 MPa) * 3.14 ] / 3		17,000N
Industry Equivalent Part Number(s):
ZSM-021, ZSM-21