Bolt Weight Chart in Kg – Hex Bolt, Anchor Bolt, Nut Bolt Dimensions & PDF

Bolt Weight Chart, Dimensional Chart in Kg, mm & PDF

Accurate bolt weight data is foundational to structural engineering, procurement planning, and logistics management. Whether you are ordering fasteners in bulk, calculating dead loads for a steel structure, or shipping components across continents, a reliable bolt weight chart eliminates guesswork and reduces costly errors.

This page serves as a complete engineering reference hub covering hex bolt weight, anchor bolt weight, nut bolt weight charts in KG, downloadable PDF resources, bolt dimensions, grade classifications, and online calculator guidance. All values are based on widely recognized international standards including ISO and DIN specifications, covering mild steel (MS) and stainless steel (SS) fasteners.

Engineers, procurement managers, structural contractors, and manufacturing teams will find everything needed here — from individual piece weights to weight per 100 bolts, from M6 to M48 metric sizes, and from standard hex bolts to J-type anchor bolts. Bookmark this page as your go-to fastener reference.

Bolt Dimensions & Specifications

Bolt weight is influenced by diameter, length, thread type, head style, and material density. The tables below provide commercial standard approximate weights for mild steel hex bolts (density 7.85 g/cm³) across common lengths.

Bolt Weight Chart (Commercial Standard Values)

Hex Head Bolt Dimensions Chart (ISO 4014 / DIN 931)

The dimensional tolerances for hex bolts are standardized under ISO 4014 (partially threaded) and ISO 4017 (fully threaded). Key dimensions include:

Bolt Head Size Chart

The bolt head size — specifically width across flats (WAF) — determines the spanner or socket size required during installation. WAF is standardized per ISO 272.

Thread Pitch & Shank Length Explained

Thread pitch is the distance in millimeters between adjacent thread crests. Metric bolts use coarse thread pitch as standard (e.g., M20 = 2.5mm pitch) with fine pitch available for vibration-prone applications.

Shank length refers to the unthreaded cylindrical portion of the bolt body. For partially threaded bolts (ISO 4014), shank length = total length minus thread length (b). Fully threaded bolts (ISO 4017) have no unthreaded shank; thread runs the entire body length.

In structural bolted connections, shank length placement within the grip zone affects joint shear performance and must be specified correctly in bolt schedules.

Hex Bolt Weight Chart (Metric – DIN 931 / ISO 4014 Standard)

Hex bolts, also called hexagonal head bolts, are the most widely used structural fasteners in construction and mechanical assemblies. Their weight varies based on nominal diameter, length, thread pitch, and material density. The values below are calculated for mild steel (density: 7.85 g/cm³) per ISO 4014 (partially threaded) and ISO 4017 (fully threaded) standards.

Understanding weight per piece and weight per 100 pieces helps procurement teams accurately plan shipment loads, verify invoice quantities, and calculate structural dead loads.

Hex Bolt Weight Chart in KG Table (Mild Steel – Metric Sizes M6 to M24)

Note: For grade 10.9 bolts, multiply values by approximately 1.01–1.02 (negligible density difference; same geometry). Stainless steel 316 bolts weigh approximately 1–2% more due to slightly higher density (8.0 g/cm³).

Anchor Bolt Weight & Anchor Bolt Size Chart

Anchor bolts are used to attach structural elements to concrete foundations. They appear in column base plates, equipment mounting, bridge structures, and seismic retrofitting. Common anchor bolt types include L-type (bent), J-type (hook end), headed (plate washer), and double-end threaded rods.

Anchor bolt weight depends on the rod diameter, total length including the embedded hook or bend, and material. The following anchor bolt weight chart table covers common foundation bolt sizes used in structural and civil engineering.

Anchor Bolt Weight Chart Table (Mild Steel – J-Type / L-Type)

Anchor Bolt Size Chart (Standard Dimensions)

Anchor bolts in standard sizes follow IS 5624:2021 specifications for foundation bolts used in civil engineering, defining shank forms like J-type and L-type hooks, thread dimensions, and preferred embedment lengths. These dimensions ensure proper anchorage in concrete while accommodating tolerances for hook radius (±3mm) and nut compatibility

Anchor Bolt Size Chart (Standard Dimensions) Table

Anchor Bolt Dimensions Chart — Key Parameters

Anchor bolt dimensions are defined by five primary parameters:

• Nominal diameter (d): The thread and shank diameter (e.g., M20 = 20 mm)
• Total length (L): Full installed length including embedded hook portion
• Threaded length (b): The length of usable thread above the concrete surface
• Hook length: The bent or hooked embedded end length ensuring pull-out resistance
• Projection length: The amount of bolt extending above the base plate

Engineers select anchor bolt sizes based on tensile load requirements, concrete strength (fck), and edge distance calculations per IS 456, ACI 318, or Eurocode 2.

Anchor Bolt Dimensions Chart Table

Nut Bolt Weight Chart in KG

When calculating total fastener assembly weight, the combined weight of the bolt and matching nut must be accounted for. This is particularly important in structural steel fabrication, flange joint assemblies, and offshore platform design where total load calculations are mandatory.

Hex Nut Weight Chart (Mild Steel – ISO 4032 Standard)

Combined Nut + Bolt Weight Chart (M10 to M24, 8.8 Grade, Mild Steel)

A downloadable nut bolt weight chart in kg PDF covering M4 through M48 sizes is available at the end of this page. It includes washer weights and high-tensile grades 8.8, 10.9, and 12.9.

Nut Bolt Weight Calculator & Hex Bolt Weight Calculator

The Weight Calculation Formula

Bolt weight is calculated using the standard volumetric formula:

Weight (kg) = Volume (cm³) × Density (g/cm³) ÷ 1000

A simplified formula commonly used in engineering estimation:

Weight (kg) = (π/4) × d² × L × ρ × 10⁻⁶

Where:

• d = nominal diameter in mm
• L = total length in mm
• ρ = material density (7.85 g/cm³ for mild steel; 7.93 g/cm³ for SS 304; 8.0 g/cm³ for SS 316)

Worked Calculation Example — M20 × 100mm Hex Bolt (Mild Steel)

1. Shank volume = (π/4) × 20² × 85 = 26,703 mm³ (assuming 85mm unthreaded)
2. Thread volume ≈ (π/4) × 18.38² × 15 = 3,982 mm³ (reduced root diameter)
3. Head volume = Hexagonal cross-section × head height ≈ 6,498 mm³
4. Total volume ≈ 37,183 mm³ = 37.18 cm³
5. Weight = 37.18 × 7.85 / 1000 = 0.292 kg/piece (approx.)

This aligns with tabulated values of 0.231–0.318 kg/piece for M20 × 100mm bolts, with minor variation due to chamfers, thread relief, and manufacturing tolerances.

Material Density Reference Table

Online hex bolt weight calculators use these density values combined with exact geometric inputs to produce precise per-piece and per-lot weights. For high-value procurement or structural analysis, always verify calculated weights against certified mill test reports (MTRs).

Bolt Grade Chart

Bolt property class (commonly called "grade" in industry) defines the mechanical strength of a fastener. ISO 898-1 governs property classes for metric steel bolts. The marking system uses a two-number code separated by a decimal: the first number × 100 = minimum tensile strength (MPa), and the product of both numbers × 10 = minimum yield strength (MPa).

Bolt Grade Comparison Chart (ISO 898-1)

Grade 8.8 Bolt Properties

Grade 8.8 is the most commonly used high-tensile bolt in construction. It is manufactured from medium carbon steel, heat treated by quenching and tempering. An M20 grade 8.8 bolt has a tensile capacity of approximately 192.8 kN and is widely used in structural steel connections per IS 800, BS EN 1993, and AISC specifications.

Grade 10.9 Bolt Properties

Grade 10.9 bolts offer 25% higher tensile strength than 8.8 and are used where bolt diameter must be minimized without sacrificing load capacity. Common in automotive assemblies, heavy machinery, and moment-resisting connections. These require hardened washers (HRC 35-45) under the head and nut.

Grade 12.9 Bolt Properties

Grade 12.9 is the highest standard ISO property class, used in precision engineering, aerospace-adjacent applications, and highly loaded mechanical joints. They are not typically used in civil structural applications. Hydrogen embrittlement is a concern; proper storage and handling protocols must be followed.

Conclusion

A comprehensive bolt weight chart is an indispensable tool for engineers, estimators, and procurement professionals working with structural fasteners. From hex bolt weight per piece to total nut bolt weight assemblies, from anchor bolt dimensions to bolt grade property classes, this page provides a complete reference covering all standard metric sizes per DIN and ISO standards.

For critical structural applications, always cross-reference tabulated weight values against manufacturer data sheets and certified test reports. Use the formulas and density reference tables to validate calculated weights independently. Download the PDF resources in Section 6 for offline access and site-level reference.

If you require custom bolt sizes, special material grades, or bulk quantity quotations, contact your fastener supplier with the size, grade, material, and quantity specifications outlined in this guide.