Dimensions tolerance for API 5L seamless pipe.

1. For outer diameters less than 2 3/8 in (60.3 mm), pipe body diameter tolerance +/-0.5 mm. Pipe end +/- 0.5 mm; Out of Roundness tolerance for pipe body is 0.9 mm (0.036 in), pipe end 0.6 mm (0.024 mm).

2. For OD equal or above 2 3/8 in (60.3) to 24 in (610 mm), (diameter tolerance) for pipe body is +/- 0.0075D, pipe end +/- 0.005D but max to +/- 1.6 mm (0.063mm); Roundness tolerance for pipe body ≤ 0.015D, pipe end ≤ 0.01D.

(In case agreed with manufacturer and client, more strictly tolerances could be applied)

3. For wall thickness

Below than 4 mm (0.0157 in), tolerance +0.6 (0.024 mm), -0.5 mm (0.020 in);

For API 5L seamless steel pipe thickness in 4 mm to 10 mm (0.394 in), +0.150t, -0.125t;

For API seamless pipe thickness 10 mm to 25mm (0.984 in), +/-0.125t;

Wall thickness ≥ 25 mm, +3.7mm or +0.1t (if larger) and -3.0 mm (0.120 in) or -0.1t (if larger).

t for thickness;

4. For straightness, max for full length, tolerance maximum 0.15% of length.

5. Straightness, max deviation for pipe end, shall be ≤ 0.3 mm /m.

6. Length +/- 200 mm for general, +/- 25.4 mm for special.