4.000" 4130 Chromoly Tubing
Four-inch OD 4130 tubing is chiefly a machining and heavy engineering size, used for sleeves, housings, cylinder bodies, rollers and couplings that need the strength of a chromium-molybdenum steel.
Where 4.000" OD 4130 Tube Is Used
Machine shops buy this diameter to avoid boring solid bar. Starting from a tube with the right wall removes far less metal, which saves machine time and tooling. Oil and gas tooling, mining equipment and general machinery are typical users.
At this size the tube is heavy: a 0.250" wall weighs about 10 lb per foot, so lifting and cutting arrangements matter. Supplying pieces cut close to finished length reduces handling at your end.
Ordering 4.000" OD Tubing
Give the OD, wall, condition, standard and the lengths required. If the part is machined, state the finished dimensions. Sizes at the top of the regular supply range are often produced as hot finished seamless tubing, which carries wider tolerances than cold drawn tube.
4.000" OD 4130 Tubing: Wall, Bore and Weight Table
The table lists the bore, metal cross-section and theoretical weight for 4.000" (101.60 mm) outside diameter across the walls normally requested in cold drawn seamless 4130.
| Wall (in) | Wall (mm) | ID (in) | ID (mm) | Section area (in²) | Weight (lb/ft) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 0.083" | 2.11 | 3.834" | 97.38 | 1.021 | 3.48 | 5.17 |
| 0.120" | 3.05 | 3.760" | 95.50 | 1.463 | 4.98 | 7.41 |
| 0.188" | 4.78 | 3.624" | 92.05 | 2.251 | 7.66 | 11.40 |
| 0.250" | 6.35 | 3.500" | 88.90 | 2.945 | 10.02 | 14.91 |
| 0.375" | 9.52 | 3.250" | 82.55 | 4.271 | 14.53 | 21.63 |
| 0.500" | 12.70 | 3.000" | 76.20 | 5.498 | 18.71 | 27.84 |
Values are calculated from nominal dimensions (weight = (OD − wall) × wall × 10.69). A row in this table is a dimensional reference, not a statement that the size is held in stock; confirm availability when you enquire.
Frequently Asked Questions
What does 4.000" × 0.250" 4130 tubing weigh?
About 10.02 lb/ft, or 14.91 kg/m, from nominal dimensions.
Can 4.000" OD tube be cut into short rings?
Yes. Short machining blanks can be cut to length. Provide the part length plus your facing allowance.
Is 4.000" tube the same as 4-inch pipe?
No. Four-inch nominal pipe measures 4.500" OD. Order tube by the actual outside diameter you need.
What is the bore of 4.000" × 0.375" tubing?
The nominal inside diameter is 3.250".
Which condition should I order for machining 4.000" tube?
Annealed machines most easily. If the part needs higher strength, it is usually heat treated after rough machining.
How should 4.000" OD tube be handled?
It is heavy, so use lifting equipment and padded supports. Ask for pieces cut near finished length to reduce handling.
Enquire for 4.000" OD 4130 Tubing
Provide your required wall thickness, condition, standard, and footage for a 4.000" OD 4130 quotation.
- OD: 4.000"
- Wall Thickness
- Standard (ASTM A519)
- Condition
- Footage / Quantity
- MTC 3.1 required
- Delivery