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UR-381
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Ring Specs
(D) Free Diameter: 3.945 +0.030 / -0.000 in.
(t) Thickness: 0.039 +0.002 / -0.002 in.
(b) Radial Wall: 0.188 +0.004 / -0.006 in.
Groove Specs:
(B) Application Diameter: 3.812 in.
(G) Groove Diameter: 3.904 +0.006 / -0.006 in.
(W) Groove Width: 0.044 +0.003 / -0.000 in.
Groove Depth: 0.046 in.
Other Specs
Approximate Weight per 1000:
(m) Material Thickness:0.038in.
(N) Ring Number of Turns:1.000
(Pg) Theoretical Thrust Load Capacity - Groove Yield:
Notes: Yield Strength of Groove Material (Ys): 45,000 psi. Calculated using a safety factor (K) of 2

Equation:
Pg = [ B * d * Ys * pi ] / K
    = [ (3.812 in.) * (0.046 in.) * (45,000 psi) * 3.14 ] / 2		12,388lbs.
(Pr) Theoretical Thrust Load Capacity - Ring Shear:
Notes: Ring Material: Carbon Spring Steel (SAE 1070-1090). Shear Strength of Ring Material (Ss): 126,000 psi. Calculated using a safety factor (K) of 3

Equation:
Pr = [ B * t * Ss * pi ] / K
    = [ (3.812 in.) * (0.039 in.) * (126,000 psi) * 3.14 ] / 3		19,606lbs.
Industry Equivalent Part Number(s):
UR-381, KL-381, VH-381