ASTM B165 Monel 400 Permissible Variations in Dimensions
ASTM B165 is a standard specification for nickel-copper alloy (UNS N04400) seamless pipes and tubes. This specification covers seamless pipes and tubes for use in general corrosion applications. It specifies the permissible variations in dimensions, wall thickness, and weight as well as the tolerances for those dimensions.
The nominal outside diameter of the ASME SB165 pipes or tubes shall be within ±0.5% of the specified size. The nominal wall thickness shall be within ±10% of the specified size. The permissible variations in length depend on the size of the pipe or tube. Pipes or tubes with an outside diameter of less than 12.5 mm shall have a permissible variation of ±0.13 mm in length. Pipes or tubes with an outside diameter of 12.5 mm or more shall have a permissible variation of ±0.25 mm in length.
Permissible Variations for OD and WT of ASTM B165 Seamless Cold Worked Pipe and TubeAB
| Nominal Outside diameter in. (mm) | Permissible Variations | % of Thickness of Specified Minimum Wall |
||||
| Outside Diameter, in. (mm) | % of Thickness of Specified Nominal Wall | |||||
| + | - | + | - | + | - | |
| Over 0.400 (10) to 5⁄8 (16), excl | 0.005(0.13) | 0.005(0.13) | 15 | 15 | 30 | 0 |
| 5⁄8 (16) to 11⁄2 (38), incl | 0.0075(0.19) | 0.0075(0.19) | 10 | 10 | 22 | 0 |
| Over 11⁄2 (38) to 3 (76), incl | 0.010(0.25) | 0.010(0.25) | 10 | 10 | 22 | 0 |
| Over 3 (76) to 41⁄2 (114), incl | 0.015(0.38) | 0.015(0.38) | 10 | 10 | 22 | 0 |
| Over 41⁄2 (114) to 6 (152), incl | 0.020(0.51) | 0.020(0.51) | 12.5 | 12.5 | 28 | 0 |
| Over 6 (152) to 65⁄8 (168), incl | 0.025(0.64) | 0.025(0.64) | 12.5 | 12.5 | 28 | 0 |
| Over 65⁄8 (168) to 85⁄8 (219), incl | 0.031(0.79) | 0.031(0.79) | 12.5 | 12.5 | 28 | 0 |
AOvality-The permissible variations in this table apply to individual measurements, including out-of-roundness (ovality) except for the following:
For pipe and tube having a nominal wall thickness of 3 % or less of the nominal outside diameter, the mean outside diameter shall conform to the permissible variations of this table and individual measurements (including ovality) shall conform to the plus and minus values of the table, with the values increased by 0.5 % of the nominal outside diameter.
For pipe and tube over 41⁄2 in. (114 mm) in outside diameter with a nominal wall thickness greater than 3 % of the nominal outside diameter, the mean outside diameter shall conform to the permissible variations of this table and individual measurements shall not exceed twice the permissible variations of the table.
BEccentricity-The permissible variations in this table apply to individual measurements including eccentricity.
ASTM B165 Permissible Variations in LengthA
| Outside Diameter, in. (mm) | Cut Length, in. (mm) | |
| Over | Under | |
| Under 2 (50.8) | 1⁄8 (3.2) | 0 |
| 2 (50.8) and over | 3⁄16 (4.8) | 0 |
AThese permissible variations in length apply to pipe or tube in straight lengths. They apply to cut lengths up to and including 24 ft (7.3 m). For lengths over 24 ft, an additional over-tolerance of 1⁄8 in. (3.2 mm) for each 10 ft (3.0 m) or fraction thereof shall be permissible up to a maximum additional over-tolerance of 1⁄2 in. (12.7 mm)
Permissible Variations for ASTM B165 Small-Diameter and Light-Wall Tube
| Specified Outside Diameter in. (mm) |
Outside Diameter | Inside Diameter in. (mm) | Wall Thickness % | |||
| + | - | + | - | + | - | |
| Under 3⁄32 (2.4) | 0.002 (0.05) | 0 | 0 | 0.002 (0.05) | 10 | 10 |
| 3⁄32 to 3⁄16 (2.4 to 4.8), excl | 0.003 (0.08) | 0 | 0 | 0.003 (0.08) | 10 | 10 |
| 3⁄16 to 1⁄2 (4.8 to 12.7), excl | 0.004 (0.10) | 0 | 0 | 0.004 (0.10) | 10 | 10 |
| 1⁄2 to 11⁄4 (12.7 to 31.8), incl | 0.005 (0.13) | 0 | 0 | 0.005 (0.13) | 10 | 10 |
Tolerances on Cut Lengths of Light-Wall ASTM B165 Tube
| Length ft (cm) | Tube Size in. (mm) | Permissible Variations in. (mm) | |
| Over | Under | ||
| Under 1 (30) | up to 1.250 (31.8), incl | 1⁄32 (0.8) | 0 |
| 1 to 4 (30 to 122), incl | up to 1.250 (31.8), incl | 1⁄16 (1.6) | 0 |
| Over 4 to 10 (122 to 300), inc | up to 1.250 (31.8), incl | 3⁄32 (2.4) | 0 |
| Over 10 (300) | up to 1.250 (31.8), incl | 3⁄16 (4.8) | 0 |
FAQ: ASTM B165 / Monel 400
Q: Does ASTM B165 cover welded pipe?
A: No. ASTM B165 is specifically for cold-worked seamless pipe and tube. Welded Monel 400 is covered under different standards like ASTM B725.
Q: What is the difference between ASTM B165 and B163?
A: While both involve Monel 400, ASTM B163 is focused on Condenser and Heat Exchanger tubes, whereas ASTM B165 is more general for pipe and tube applications.
Q: Can I get custom tolerances?
A: Yes. While ASTM B165 defines the standard, HT Steel Pipe can supply pipes with restricted tolerances for specialized engineering requirements.
Inquire About Monel 400 ASTM B165 Inventory
HT Steel Pipe stocks a wide range of Monel 400 seamless pipes.
Sizes: 1/8" to 12" NPS
Schedules: SCH 5S, 10S, 40S, 80S, 160, XXS
Certification: Full MTC (Material Test Certificate) provided with all orders.
