Jade Alloys is a leading supplier and exporter of high-quality threaded rods, serving engineers, procurement specialists, and fabricators across global construction, piping, and structural projects. Having the right data before ordering materials is critical, and this guide brings together threaded rod dimensions, a complete thread rod weight chart in both metric and inch, and a ready-to-use threaded rod weight per metre table covering M6 to M64. You will also find the weight formula, grade comparison, and relevant standards all in one place.
What Is a Threaded Rod?
A threaded rod, also called an all-thread rod or fully threaded bar, is a long piece of metal that has external threads throughout its length. Commonly found in building, flanged joints, hanging, conduit support, and anchor assemblies. A threaded rod is externally threaded along its full length, while a stud bolt may have threaded ends with an unthreaded shank depending on the standard.
The length of the threaded rod is standard 1m, 2m, 3m, 6m, and can be cut as per the requirements. Common materials are carbon steel, stainless steel, alloy steel and exotic alloys like Inconel and Monel. Finish options include plain, zinc plated, hot dip galvanized and passivated stainless.
Threaded Rod Size Chart: Metric (M6 to M64)
The table below lists threaded rod dimensions for metric sizes following ISO 724 and DIN 975. All values are in millimetres.
| Size | OD (mm) | Thread Pitch (mm) | Root Dia. (mm) | Tensile Area (mm²) | Available Lengths (m) |
| M6 | 6 | 1.00 | 4.77 | 20.1 | 1, 2, 3 |
| M8 | 8 | 1.25 | 6.47 | 36.6 | 1, 2, 3 |
| M10 | 10 | 1.50 | 8.16 | 58.0 | 1, 2, 3 |
| M12 | 12 | 1.75 | 9.85 | 84.3 | 1, 2, 3 |
| M16 | 16 | 2.00 | 13.55 | 157 | 1, 2, 3, 6 |
| M20 | 20 | 2.50 | 16.93 | 245 | 1, 2, 3, 6 |
| M24 | 24 | 3.00 | 20.32 | 353 | 1, 2, 3, 6 |
| M30 | 30 | 3.50 | 25.71 | 561 | 1, 2, 3, 6 |
| M36 | 36 | 4.00 | 31.09 | 817 | 1, 2, 3, 6 |
| M42 | 42 | 4.50 | 36.48 | 1120 | 3, 6 |
| M48 | 48 | 5.00 | 41.87 | 1470 | 3, 6 |
| M56 | 56 | 5.50 | 49.25 | 2030 | 3, 6 |
| M64 | 64 | 6.00 | 56.64 | 2680 | 3, 6 |
Threaded Rod Size Chart: Inch UNC (1/4″ to 2-1/2″)
The following stud rod size chart covers Unified National Coarse (UNC) inch sizes. OD and root diameter values are converted to millimetres for easy comparison with metric sizes.
| Size | OD (mm) | Thread Pitch (mm) | Root Dia. (mm) | Tensile Area (mm²) | Available Lengths (m) |
| 1/4″ | 6.35 | 20 TPI | 4.98 | 20.5 | 1, 2, 3 |
| 3/8″ | 9.53 | 16 TPI | 7.65 | 47.0 | 1, 2, 3 |
| 1/2″ | 12.70 | 13 TPI | 10.29 | 91.7 | 1, 2, 3 |
| 5/8″ | 15.88 | 11 TPI | 13.00 | 145 | 1, 2, 3, 6 |
| 3/4″ | 19.05 | 10 TPI | 15.80 | 216 | 1, 2, 3, 6 |
| 7/8″ | 22.23 | 9 TPI | 18.60 | 300 | 1, 2, 3, 6 |
| 1″ | 25.40 | 8 TPI | 21.33 | 400 | 1, 2, 3, 6 |
| 1-1/4″ | 31.75 | 7 TPI | 26.97 | 633 | 3, 6 |
| 1-1/2″ | 38.10 | 6 TPI | 32.46 | 916 | 3, 6 |
| 1-3/4″ | 44.45 | 5 TPI | 38.20 | 1260 | 3, 6 |
| 2″ | 50.80 | 4.5 TPI | 43.94 | 1680 | 3, 6 |
| 2-1/2″ | 63.50 | 4 TPI | 55.42 | 2680 | 3, 6 |
Threaded Rod Weight Chart per Metre (M6 to M64)
This threaded rod weight chart is the primary reference engineers use when estimating material quantities and shipping weights before ordering. Values are calculated using the standard steel density formula and are expressed as threaded rod weight per metre in kg/m.
| Size | Weight per Metre (kg/m) | Weight per 3 m Rod (kg) | Weight per 6 m Rod (kg) |
| M6 | 0.222 | 0.67 | 1.33 |
| M8 | 0.395 | 1.18 | 2.37 |
| M10 | 0.617 | 1.85 | 3.70 |
| M12 | 0.889 | 2.67 | 5.33 |
| M16 | 1.580 | 4.74 | 9.48 |
| M20 | 2.468 | 7.40 | 14.81 |
| M24 | 3.554 | 10.66 | 21.32 |
| M30 | 5.553 | 16.66 | 33.32 |
| M36 | 7.996 | 23.99 | 47.98 |
| M42 | 10.884 | 32.65 | 65.30 |
| M48 | 14.216 | 42.65 | 85.30 |
| M56 | 19.349 | 58.05 | 116.09 |
| M64 | 25.272 | 75.82 | 151.63 |
Note: Weight values above apply to carbon steel (density 7.85 g/cm3). For anchor bolts and structural applications in stainless steel, multiply by 1.01 (SS 304) or 1.02 (SS 316). For alloy steel grades such as ASTM A193 B7, the density is effectively identical to carbon steel at 7.85 g/cm3.
| Need Threaded Rods for Your Project? Jade Alloys supplies threaded rods in carbon steel, SS 316, and exotic alloys with cut-to-length and full-length options. Contact our team for a fast quote. Get in touch today. |
How to Calculate Threaded Rod Weight
The standard formula for all thread rod weight per metre of carbon steel is:
W (kg/m) = 0.00617 x d2
Where d = nominal diameter in millimetres and 0.00617 is the steel weight constant derived from density and cross-section geometry.
Example: M20 threaded rod W = 0.00617 x 20 x 20 = 0.00617 x 400 = 2.47 kg/m
Weight of a full 6 m rod: 2.47 x 6 = 14.8 kg
This formula is accurate for plain carbon steel. For austenitic stainless grades like those covered under ASTM A193 B8, the value increases by approximately 1 to 2 percent due to slightly higher alloy density. For quick site estimation, the carbon steel figure is acceptable for most applications.
Threaded Rod Grades and Materials
Selecting the right grade is as important as knowing the threaded rod dimensions chart. The table below summarises the most common threaded rod grades used in industrial and structural applications.
| Grade | Standard | Material | Min. Tensile Strength (MPa) |
| 4.8 | DIN 975 / ISO | Low Carbon Steel | 420 |
| 8.8 | DIN 975 / ISO | Medium Carbon Steel | 800 |
| B7 | ASTM A193 | Chromium Molybdenum Steel | 862 min |
| B8 | ASTM A193 | Stainless Steel 304 | 515 |
| B8M | ASTM A193 | Stainless Steel 316 | 515 |
| F1554 Gr.36 | ASTM F1554 | Low Carbon Steel | 400 |
| F1554 Gr.55 | ASTM F1554 | Low Alloy Steel | 690 |
Grade 4.8 is a general-purpose carbon steel grade suitable for light structural work and non-critical assemblies. Grade 8.8 offers higher tensile strength and is used in medium-duty construction and machinery mounting. Both are common in galvanized and zinc-plated finishes.
ASTM A193 B7 (chromium molybdenum alloy steel) is the dominant grade for high-temperature process piping, pressure vessels, and flanged joints. It is paired with A194 Grade 2H heavy hex nuts. See our full range of ASTM A193 B7 bolts and threaded rods for specifications and availability.
ASTM A193 B8 and B8M cover austenitic stainless steel grades 304 and 316 respectively. These grades are preferred in corrosive environments including chemical processing, coastal installations, and food-grade applications. Browse our ASTM A193 B8 bolts and threaded rods for available sizes.
Threaded Rod Standards DIN 975 and ASTM F1554
DIN 975 is the primary European metric standard for threaded rods (also known as studding). It defines thread geometry, tolerances, and length for metric threaded bars from M3 to M100. DIN 975 rods are widely used across construction, HVAC, and mechanical engineering in Europe and Asia. Finishes available under this standard include plain (self-colour), zinc electroplated, and hot-dip galvanized.
ASTM F1554 is the US standard specifically designed for structural anchor bolts and threaded rods used in concrete embedment. It covers three strength grades: Grade 36 (min. yield 248 MPa), Grade 55 (min. yield 380 MPa), and Grade 105 (min. yield 724 MPa). ASTM F1554 rods are used extensively in bridge construction, transmission towers, and large-scale infrastructure projects where anchor bolts must meet defined weldability and notch-toughness criteria. Available finishes include plain, mechanically galvanized, and hot-dip galvanized.
Both standards allow cut-to-length supply, making them compatible with project-specific requirements where full 3 m or 6 m rods are not required. Always verify that the chosen grade and finish match both the load requirements and the environmental conditions of the installation.
The Bottom Line
This guide has covered the full threaded rod weight chart from M6 to M64, a thread rod size chart in both metric and inch UNC, the weight calculation formula, grade selection, and the two leading international standards. Whether you are procuring for a piping project requiring ASTM A193 B7 material or a structural anchor application governed by ASTM F1554, the data above provides the foundation for accurate estimation and specification.
| Source Threaded Rods from Jade Alloys Jade Alloys supplies threaded rods in carbon steel, SS 316, and exotic alloys. Contact us for cut-to-length and full-length options. Contact Us Now |
Frequently Asked Questions
Q: What is the weight of a threaded rod per metre?
A: Weight varies by size. M6 = 0.222 kg/m, M12 = 0.889 kg/m, M20 = 2.468 kg/m, M30 = 5.553 kg/m, M64 = 25.272 kg/m. Values apply to carbon steel at 7.85 g/cm³.
Q: How do you calculate threaded rod weight?
A: Use the formula: W (kg/m) = 0.00617 × d². Where d is the nominal diameter in mm. Example: M20 = 0.00617 × 400 = 2.47 kg/m. For stainless steel, add 1–2%.
Q: What is the standard length of threaded rod?
A: Standard lengths are 1 m, 2 m, 3 m, and 6 m. Smaller sizes (M6–M12) are typically available up to 3 m; larger sizes (M16–M64) are stocked in 6 m lengths. Cut-to-length is also available.
Q: What is the difference between threaded rod and stud bolt?
A: A threaded rod is fully threaded along its entire length. A stud bolt has threaded ends with an unthreaded shank in the middle, per standards like ASTM A193 for flanged joints.
Q: Which standards cover threaded rods?
A: Key standards include DIN 975 (metric, M3–M100), ASTM A193 (B7, B8, B8M grades), and ASTM F1554 (structural anchor bolts, Grades 36, 55, 105) for construction and process piping.
