1.625" 4130 Chromoly Tubing
1.625" OD, usually written 1-5/8", sits between the two most common cage diameters. It is strongly associated with drag racing chassis work, where chromoly cage and frame members are often specified at this size with a 0.083" wall.
Where 1.625" OD 4130 Tube Is Used
The size is popular wherever a builder wants more section than 1.500" without the weight of 1.750". Besides cage hoops and frame rails it is used for strut tower braces, four-link bars and chassis uprights.
Because fewer industries use 1-5/8" than 1-1/2" or 1-3/4", availability can be tighter in unusual walls. If your design allows either neighbouring diameter, ask for both when you request a price. Rules for certified chassis are specific about diameter and wall, so confirm the figure in the current specification before buying.
Ordering 1.625" OD Tubing
Give the diameter as a decimal (1.625") to avoid confusion with 1.660" pipe sizes, along with the wall, condition and standard. There is also a dedicated page for 1-5/8 chromoly tubing supply. For matching die sets, note that bend tooling for 1.625" is separate from 1.500" and 1.750" tooling.
1.625" OD 4130 Tubing: Wall, Bore and Weight Table
The table lists the bore, metal cross-section and theoretical weight for 1.625" (41.27 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) |
|---|---|---|---|---|---|---|
| 0.035" | 0.89 | 1.555" | 39.50 | 0.175 | 0.59 | 0.89 |
| 0.049" | 1.24 | 1.527" | 38.79 | 0.243 | 0.83 | 1.23 |
| 0.058" | 1.47 | 1.509" | 38.33 | 0.286 | 0.97 | 1.45 |
| 0.065" | 1.65 | 1.495" | 37.97 | 0.319 | 1.08 | 1.61 |
| 0.083" | 2.11 | 1.459" | 37.06 | 0.402 | 1.37 | 2.04 |
| 0.095" | 2.41 | 1.435" | 36.45 | 0.457 | 1.55 | 2.31 |
| 0.120" | 3.05 | 1.385" | 35.18 | 0.567 | 1.93 | 2.87 |
| 0.156" | 3.96 | 1.313" | 33.35 | 0.720 | 2.45 | 3.65 |
| 0.188" | 4.78 | 1.249" | 31.72 | 0.849 | 2.89 | 4.30 |
| 0.250" | 6.35 | 1.125" | 28.57 | 1.080 | 3.67 | 5.47 |
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
Is 1-5/8" the same as 1.625" OD?
Yes. 1-5/8" is the fractional form of 1.625" (41.28 mm). It is a tube size measured on the actual outside diameter, not a nominal pipe size.
What does 1.625" × 0.083" 4130 tubing weigh?
About 1.37 lb/ft, or 2.04 kg/m, from nominal dimensions.
Can I substitute 1.500" or 1.750" tube for 1.625"?
Only if your design or rulebook permits it. A larger diameter is stiffer at the same wall, but joints, notching and bend tooling all change with the diameter.
What is the bore of 1.625" × 0.083" tubing?
The nominal inside diameter is 1.459".
Enquire for 1.625" OD 4130 Tubing
Provide your required wall thickness, condition, standard, and footage for a 1.625" OD 4130 quotation.
- OD: 1.625"
- Wall Thickness
- Standard (ASTM A519)
- Condition
- Footage / Quantity
- MTC 3.1 required
- Delivery