United Exim Engineering Library
Washer weight chart.
Plain-washer, flat-section spring-washer and square-section spring-washer references are separated by their governing standards. Structural ASTM F436/F436M washers are treated separately because permitted thickness ranges affect piece mass.
ISO 7089 · DIN 125A legacy reference
REFERENCEPlain washer
d1 inside diameter · d2 outside diameter · s thickness.
IS 3063
REFERENCESpring lock washer — flat / rectangular section
d1 inside · d2 outside · b width · s section thickness. Use this for the calculator’s “Flat Section” spring-washer option.
IS 6735
REFERENCESpring washer — square section
Square-section split spring washer. Use this for the calculator’s “Square Section” option.
ASTM F436 / F436M
REFERENCEHardened structural washer
Structural washer geometry and thickness follow the selected F436/F436M size range; do not substitute ordinary plain-washer mass.
Metric mass reference
Approximate kg / 1,000 pieces. Values are separated by standard instead of mixing spring-washer types into one column.
| Size | Plain ISO 7089 | IS 3063 flat / rectangular | IS 6735 square |
|---|---|---|---|
| M6 | 1.020 | 0.83 | 0.425 |
| M8 | 1.830 | 1.60 | 1.05 |
| M10 | 3.570 | 2.53 | 1.96 |
| M12 | 6.270 | 3.82 | 2.28 |
| M14 | 8.620 | 6.01 | 3.80 |
| M16 | 11.300 | 8.91 | 5.94 |
| M18 | 14.700 | 9.73 | 6.60 |
| M20 | 17.200 | 15.20 | 12.30 |
| M22 | 18.400 | 16.50 | 13.60 |
| M24 | 32.300 | 26.20 | 18.10 |
| M27 | 43.700 | 28.70 | 20.60 |
| M30 | 53.600 | 44.30 | 32.00 |
| M33 | 75.300 | 63.00 | 35.00 |
| M36 | 92.100 | — | 52.50 |
| M39 | 133 | — | 56.10 |
| M42 | 183 | — | 80.00 |
| M45 | 220 | — | 85.30 |
| M48 | 294 | — | 90.00 |
| M52 | 330 | — | — |
| M56 | 425 | — | — |
| M60 | 458 | — | — |
| M64 | 492 | — | — |
ASTM F436 / F436M
F436/F436M washer thickness is specified as a permitted range. The United Exim calculator therefore uses the selected structural-washer reference/geometry rather than pretending there is one universal weight for every nominal size.