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Washer Dimensions & Weight Chart in mm and kg – IS, ISO & BSS Standards

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Washer Weight Chart in mm & kg | Flat Washer Dimensions, Spring Washers & PDF Download

Washers are among the most essential and widely used fastening components in engineering, construction, and manufacturing. Whether you are working with plain washers, flat washers, or spring washers, having accurate washer dimensions in mm and the correct washer weight in kg is critical for safe and reliable assembly. This comprehensive guide covers the complete washer weight chart, washer size chart, bolt and washer sizes, and all relevant dimensional data conforming to Indian Standards (IS) and British Standards (BSS).

From M4 washer dimensions and M5 washer dimensions to M16 washer dimensions, M20 washer dimensions, and M24 washer dimensions, every metric size is covered here. Engineers, procurement specialists, and fabricators frequently need washer weight chart PDF-equivalent data for material estimation — this guide provides everything including flat washer weight chart data, spring washer weight chart data, and washer thickness chart references all in one place.

Technical dimensional drawings of washers alongside a group of metal washers on a white background.

Understanding the different types of washers is equally important

Plain washers (also called flat washers) distribute the load of a fastener, prevent surface damage, and seal against leakage. Spring washers provide an elastic force to lock bolted connections and prevent loosening under vibration. Each type has different dimensional requirements, and both washer dimensions in mm and washer weight in kg vary significantly across sizes. Whether you refer to washing machine size in mm, ms flat weight chart data, or ms bolt weight chart comparisons, this guide brings all that information together.

Types of Washers: A Technical Overview

Before diving into the washer size chart and weight tables, it helps to understand the different categories of washers covered in this guide and as described in types of washers PDF references from standard bodies.

  • Plain Washers (Flat Washers): The most common type, plain washers are flat circular discs with a central hole. They conform to standards such as ISO 7089, DIN 125, and IS 2016. Key parameters include inner diameter (ID), outer diameter (OD), and thickness. The washer dimensions chart shows both normal series and large series variants for each bolt size.
  • Spring Washers – Flat (Rectangular) Section: These are split ring washers with a rectangular cross-section. They act as a locking device by maintaining preload in bolted joints. As per IS 3063-1994, flat section spring washers are specified by nominal size, inner diameter range, section width, thickness, and free height. The spring washer dimensions and spring washer weight chart for these are included in full below.
  • Spring Washers – Square Section: Square section spring washers have equal width and thickness dimensions, making them suitable for heavier duty locking applications. IS 6735-1972 governs their manufacture in India, and BSS 1802-1951 covers the equivalent British Standard. The washer weight chart for these types is also provided below with complete dimensional data.
  • Pack Washer: A pack washer (or packing washer) is used to fill gaps or adjust the position of components during assembly. These are typically stacked or used in sets and are selected based on thickness requirements.

Flat Washers Weight & Size Chart

The spring washer weight chart below covers dimensions (mm) and weights (kg/1000 pcs) from 3 mm to 52 mm nominal size. Find 6 mm spring washer dimensions, 8 mm spring washer dimensions, 10 mm spring washer dimensions, 12 mm spring washer dimensions, 20 mm spring washer dimensions instantly, etc. Includes tolerances per IS 3063:1994 standards for precise engineering calculations. Engineers use this washer size chart alongside stud bolt weight chart data and spring washer specifications for complete fastener assemblies in vibration-prone applications.

Washer Size Chart in mm & kg

NOM SIZE MM Inner Dia (d) Basic Tol (+) Outer Dia (d1) Max WIDTH (b) Basic Tol (+ or -) THICKNESS (S) Basic Tol (+ or -) Weight per 1000 in Kgs
33.1 0.36.21.3 0.10.8 0.10.11
44.1 0.37.61.5 0.10.9 0.10.18
55.1 0.39.21.8 0.11.2 0.10.36
66.1 0.411.82.5 0.151.6 0.10.83
88.1 0.414.83 0.152 0.11.60
1010.2 0.518.13.5 0.22.2 0.152.53
1212.2 0.521.14 0.22.5 0.153.82
1414.2 0.524.14.5 0.23 0.156.01
1616.2 0.827.45 0.23.5 0.28.91
1818.2 0.829.45 0.23.5 0.29.73
2020.2 133.66 0.24 0.215.20
2222.5 135.96 0.24 0.216.50
2424.5 1407 0.255 0.226.20
2727.5 1437 0.255 0.228.70
3030.5 1.248.28 0.256 0.244.30
3333.5 1.255.210 0.256 0.263.00
3636.5 1.258.210 0.256 0.267.30
3939.5 1.261.210 0.256 0.271.70
4242.5 1.268.212 0.257 0.25111.00
4545.5 1.271.212 0.257 0.25117.00
4849 1.57512 0.257 0.25123.00
5253 1.58314 0.258 0.25182.00

Note: Weights are approximate and based on mild steel (density ≈ 7.85 g/cm³). For stainless steel washers, multiply by 1.01 (SS 304) or 1.02 (SS 316). For hot-dip galvanized plain washers, add approximately 3–5% for coating weight.The washer weight chart PDF values shown here are suitable for standard procurement and estimation purposes.

Approx. Weight in Kgs for 100 Nos

SIZE Plain Punched (IS:2016) Heavy (IS:6610) Machined (IS:2016) Channel (IS:5372) I-Beam (IS:5374) HSFG-B Channel (IS:6649) HSFG-C I-Beam (IS:6649) Spring Flat (IS:3063) Spring Square (IS:6735)
M-30.01------0.01-
M-40.02------0.02-
M-50.04-0.04----0.03-
M-60.11-0.11----0.080.04
M-80.20-0.211.101.20--0.160.11
M-100.391.600.401.001.10--0.250.20
M-120.581.900.622.002.202.001.800.380.23
M-161.062.901.133.403.759.008.500.890.59
M-201.644.401.725.806.708.508.001.521.23
M-243.116.303.3013.5016.006.506.002.621.81
M-273.948.004.2312.5015.0012.0011.502.872.06
M-305.0510.105.3616.5018.7017.5016.004.433.20
M-368.7314.609.2025.5029.2026.5026.006.735.25
M-4217.5020.1018.30----11.108.00
M-4828.4026.0029.40----12.309.00

ISO 7089 Washer Dimensions

Find exact ISO 7089 washer dimensions for M3 to M24 sizes. This table shows inner diameter, outer diameter and thickness tolerances for normal series plain washers. Perfect reference for M6 washer dimensions, M10 washer dimensions, M12 washer dimensions and M20 washer dimensions in engineering projects.

ISO 7089 Normal Series Dimensions Table

Nominal Size Inner Dia (d1) min-max (mm) Outer Dia (d2) min-max (mm) Thickness (h) min-max (mm)
M33.2-3.47-7.60.5-0.8
M44.3-4.69-9.60.7-1.0
M55.3-5.610-10.60.8-1.2
M66.4-6.712-12.71.6-2.0
M88.4-8.717-17.81.6-2.0
M1010.5-11.021-22.02.0-2.5
M1213.0-13.524-25.02.5-3.0
M1617.0-17.730-31.03.0-3.5
M2021.0-21.837-38.03.0-3.5
M2425.0-26.044-45.04.0-4.5

Spring Washers Weight & Size Chart

Spring washers prevent bolt loosening from vibration. This IS 3063:1994 chart shows M5-M48 dimensions and kg per 100 pcs. Find M10 spring washer weight, M12 spring washer size instantly for engineering projects.

Spring Washers Weight & Size Chart

Bolt Size Inner Dia (mm) Outer Dia (mm) Width (mm) Thickness (mm) Wt/100 Pcs (kg)
M55.19.22.01.00.035
M66.111.22.51.20.065
M88.114.23.01.60.14
M1010.218.24.02.00.32
M1212.221.24.52.50.54
M1414.224.25.02.50.78
M1616.227.25.53.01.15
M1818.229.25.53.51.45
M2020.233.26.54.02.30
M2222.235.26.54.02.70
M2424.239.27.55.04.20
M2727.243.28.05.05.50
M3030.248.29.06.08.80
M3333.252.29.56.010.50
M3636.257.210.57.015.00
M3939.261.211.07.017.50
M4242.265.211.58.023.00
M4848.275.213.59.038.00

Spring Washers – Flat (Rectangular) Table

NOM SIZE Inner Dia (d) Basic Tol (+) Outer Dia (d1) Max WIDTH (b) Basic Tol (+ or -) THICKNESS (S) Basic Tol (+ or -)
33.1 0.36.21.3 0.10.8 0.1
44.1 0.37.61.5 0.10.9 0.1
55.1 0.39.21.8 0.11.2 0.1
66.1 0.411.82.5 0.151.6 0.1
88.1 0.414.83 0.152 0.1
1010.2 0.518.13.5 0.22.2 0.15
1212.2 0.521.14 0.22.5 0.15
1414.2 0.524.14.5 0.23 0.15
1616.2 0.827.45 0.23.5 0.2
1818.2 0.829.45 0.23.5 0.2
2020.2 133.66 0.24 0.2
2222.5 135.96 0.24 0.2
2424.5 1407 0.255 0.2
2727.5 1437 0.255 0.2
3030.5 1.248.28 0.256 0.2
3333.5 1.255.210 0.256 0.2
3636.5 1.258.210 0.256 0.2
3939.5 1.261.210 0.256 0.2
4242.5 1.268.212 0.257 0.25
4545.5 1.271.212 0.257 0.25
4849 1.57512 0.257 0.25
5253 1.58314 0.258 0.25

Spring Washers – Square Section Conforming to IS 6735-1972

IS 6735-1972 specifies square section spring washers (width=thickness) with higher spring rate than flat section. Ideal for heavy-duty applications with hex bolts. Free height h=2.1×thickness per BIS standards.

Spring Washers – Square Section Conforming to IS 6735-1972 Table

Inner Dia (d) Basic Tol (+) Outer Dia (d1) Max Width/Thickness (b/s) Basic Tol (+/-) Weight per 1000 (kg)
3.1 0.15.61 0.10.105
4.1 0.171.2 0.10.195
5.1 0.18.81.6 0.10.370
6.1 0.19.91.6 0.10.425
8.1 0.112.72 0.11.05
10.2 0.15162.5 0.151.96
12.2 0.15182.5 0.152.28
14.2 0.221.13 0.23.8
16.2 0.224.43.5 0.25.94
18.2 0.226.43.5 0.26.6
20.2 0.230.64.5 0.212.3
22.5 0.232.94.5 0.213.6
24.5 0.235.95 0.218.1
27.5 0.238.95 0.220.6
30.5 0.244.16 0.232
33.5 0.247.26 0.235
36.5 0.2552.27 0.2552.5
39.5 0.2555.27 0.2556.1
42.5 0.2560.28 0.2580
45.5 0.25648 0.2585.3
49 0.25678 0.2590

BSS 1802-1951: Square Section Spring Washers

BSS 1802-1951 specifies inch-based square section spring washers (3/16"-1 1⁄4") matching IS 6735 design. Width=thickness provides a high spring rate for legacy British equipment maintenance.

BSS 1802-1951: Square Section Spring Washers Table

BSS Size Inner Dia (mm) Width = Thickness (mm) Outer Dia (mm) Free Height h (mm) Wt/100 Pcs (kg)
3/16"4.91.88.53.780.025
1/4"6.52.210.94.620.055
5/16"8.22.813.85.880.115
3/8"9.83.216.26.720.220
7/16"11.53.819.17.980.375
1/2"13.24.221.68.820.530
9/16"14.84.824.410.080.760
5/8"16.55.226.910.921.040
3/4"19.86.031.812.601.680
7/8"22.87.036.814.702.700
1"26.08.042.016.803.950
1 1/8"29.29.047.218.905.550
1 1/4"32.510.052.521.007.700

Spring Washers Flat And Square Section As Per BSS 1802-1951

BSS 1802-1951 covers both flat (rectangular) and square section spring washers for legacy British equipment (3/16"-1¼"). Essential for MRO on older machinery using inch-based fasteners.

Flat (Rectangular) Section Table

BSS Size Inner Dia (mm) Outer Dia (mm) Width (mm) Thickness (mm) Wt/100 Pcs (kg)
3/16"4.98.81.90.90.028
1/4"6.511.52.51.20.065
5/16"8.214.23.01.60.145
1/2"13.222.24.52.50.570
1"26.043.08.55.04.100

Square Section Table

BSS Size Inner Dia (mm) Width = Thickness (mm) Outer Dia (mm) Free Height h (mm) Wt/100 Pcs (kg)
3/16"4.91.88.53.780.025
1/4"6.52.210.94.620.055
5/16"8.22.813.85.880.115
1/2"13.24.221.68.820.530
1"26.08.042.016.803.950

Understanding Washer Dimensions: Key Parameters Explained

When reading any washer dimensions chart or flat washer weight chart, you will encounter the following key parameters. Understanding each one helps you select the correct washer and accurately estimate washer weight in kg for your project.

  • Nominal Size / Bolt Size: This is the bolt diameter for which the washer is designed. For example, an M10 washer dimension is designed to fit a 10 mm diameter bolt. M6 washer dimensions suit M6 bolts, M8 washer dimensions suit M8 bolts, and so on up to M48 and beyond.
  • Inner Diameter (ID): The whole diameter of the washer. It must be slightly larger than the bolt shank to allow free passage. For M12 washer dimensions, the nominal inner diameter is typically 13.0 mm. The washer size in mm for the inner hole is therefore slightly larger than the nominal bolt size.
  • Outer Diameter (OD): The overall external diameter of the washer. A larger OD distributes the fastener load over a greater surface area, reducing the risk of damage to the parent material. For M20 washer size, the outer diameter is typically 37 mm in the normal series.
  • Thickness: The washer thickness chart shows how the height of the washer increases with bolt size. Washer thickness affects both the stiffness of the joint and the overall stack height. It is a key parameter when checking bolt and washer sizes for a given assembly clearance.
  • Free Height (for Spring Washers): This is the height of the uncompressed spring washer. When the washer is fully compressed flat, the spring force acts to maintain bolt tension. The free height is typically 2.1 times the washer thickness for rectangular section spring washers per IS 3063-1994.
  • Weight per 100 Pieces (kg): The washer weight chart PDF-equivalent data here is expressed as the weight in kg for 100 pieces. This is the most practical format for procurement, as fasteners are typically ordered in packs of 100 or multiples thereof. For estimating pack washer weight or building an ms flat weight chart for material cost calculations, these figures are indispensable.

Conclusion: Your Complete Washer Reference Guide

This comprehensive washer weight chart and size guide brings together all the essential data an engineer, fabricator, or procurement professional needs: plain washer dimensions in mm, flat washer weight chart in kg, spring washer dimensions and weight, ISO 7089 washer dimensions, IS 3063-1994 and IS 6735-1972 Indian Standard data, and BSS 1802-1951 British Standard dimensions. Whether you are checking M4 washer dimensions, M6 washer dimensions, M8 washer dimensions, M10 washer dimensions, M12 washer dimensions, M16 washer dimensions, M20 washer size, M24 washer dimensions, or any size in between, all the washer size chart data you need is in one place.

By combining the flat washer weight chart with the spring washer weight chart and standard-specific data, you can accurately estimate washer weight in kg for projects of any scale. The tables above serve as a practical washer weight chart PDF equivalent and can be used alongside ms flat weight chart and ms bolt weight chart data for complete structural steel and fastener material take-offs. Always verify against the relevant standard (ISO 7089, IS 3063, IS 6735, or BSS 1802) when working on safety-critical applications.

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