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M30 Flat & Spring Washer Weight & Dimensions Chart
Unit weights of M30 flat washers (GB/T 97.1) and spring lock washers (DIN 127 series, modeled dims) side by side, computed as geometric volume × density on carbon steel, with kg/1000 pcs ↔ lb/100 pcs toggle and OD/thickness dimensions — basis fully disclosed.
An M30 flat washer (carbon steel) weighs about 55 g per piece, and a spring washer about 46 g — about 55 / 46 kg/1000 pcs per lot.
Other sizes
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Flat & Spring Washer Weight Tables (M6–M36)
Flat Washers (GB/T 97.1, ≈ ISO 7089)
| Size | OD D | Thickness t | Weight per piece (g) | Bulk weight (kg/1000 pcs) |
|---|---|---|---|---|
| M6 | 12 mm | 1.6 mm | 1 g | 1 kg/1000 pcs |
| M8 | 16 mm | 1.6 mm | 2 g | 2 kg/1000 pcs |
| M10 | 20 mm | 2 mm | 4 g | 4 kg/1000 pcs |
| M12 | 24 mm | 2.5 mm | 7 g | 7 kg/1000 pcs |
| M14 | 28 mm | 2.5 mm | 9 g | 9 kg/1000 pcs |
| M16 | 30 mm | 3 mm | 12 g | 12 kg/1000 pcs |
| M18 | 34 mm | 3 mm | 15 g | 15 kg/1000 pcs |
| M20 | 37 mm | 3 mm | 18 g | 18 kg/1000 pcs |
| M22 | 39 mm | 3 mm | 19 g | 19 kg/1000 pcs |
| M24 | 44 mm | 4 mm | 34 g | 34 kg/1000 pcs |
| M27 | 50 mm | 4 mm | 44 g | 44 kg/1000 pcs |
| M30 | 56 mm | 4 mm | 55 g | 55 kg/1000 pcs |
| M33 | 60 mm | 5 mm | 77 g | 77 kg/1000 pcs |
| M36 | 66 mm | 5 mm | 94 g | 94 kg/1000 pcs |
Spring Lock Washers (DIN 127 series, modeled dims)
| Size | OD D | Thickness t | Weight per piece (g) | Bulk weight (kg/1000 pcs) |
|---|---|---|---|---|
| M6 | 11.8 mm | 1.6 mm | 1 g | 1 kg/1000 pcs |
| M8 | 14.8 mm | 2 mm | 2 g | 2 kg/1000 pcs |
| M10 | 18.1 mm | 2.2 mm | 3 g | 3 kg/1000 pcs |
| M12 | 21.1 mm | 2.5 mm | 4 g | 4 kg/1000 pcs |
| M14 | 24.1 mm | 3 mm | 6 g | 6 kg/1000 pcs |
| M16 | 27.4 mm | 3.5 mm | 9 g | 9 kg/1000 pcs |
| M18 | 30.4 mm | 3.5 mm | 11 g | 11 kg/1000 pcs |
| M20 | 33.5 mm | 4 mm | 15 g | 15 kg/1000 pcs |
| M22 | 35.5 mm | 4 mm | 16 g | 16 kg/1000 pcs |
| M24 | 39 mm | 5 mm | 24 g | 24 kg/1000 pcs |
| M27 | 44 mm | 5 mm | 31 g | 31 kg/1000 pcs |
| M30 | 49 mm | 6 mm | 46 g | 46 kg/1000 pcs |
| M33 | 53 mm | 6 mm | 53 g | 53 kg/1000 pcs |
| M36 | 57 mm | 6 mm | 60 g | 60 kg/1000 pcs |
References
- GB/T 97.1-2002 — Plain washers, product grade A (CN, official full text; aligns with ISO 7089/7090 series)
- Plain washer dimensions (ISO 7089/7090 series)
- GB/T 192-2003 — General purpose metric screw threads: basic profile (CN, official full text; ISO 68-1 equivalent)
- Metric thread basic profile (ISO 68-1)
- Dimensions cross-checked against industry fastener data libraries; densities are common industry values
Material Density Conversion
Values above are carbon steel (7.85 g/cm³); for other materials multiply by the density factor.
| Material | Density (g/cm³) | Factor |
|---|---|---|
| Carbon / Alloy Steel | 7.85 | ×1.000 |
| Stainless 304 | 7.93 | ×1.010 |
| Stainless 316 | 7.98 | ×1.017 |
| Brass | 8.5 | ×1.083 |
Basis of Calculation & Disclosed Assumptions
All values are computed as annular geometric volume π/4·(D²−d²)·t × density (carbon steel 7.85 g/cm³, base metal, coating excluded; spring lock washers carry an additional ×0.83 effective-section allowance for the split gap and section chamfers, regressed on published DIN 127 per-1,000-pcs weights) — no copyrighted standard tables are reproduced. The bore is taken at the nominal diameter d (the actual clearance hole is slightly larger, so no unmodeled ID column is shown); flat-washer dimensions follow the GB/T 97.1 (≈ ISO 7089) basis and spring lock washers use DIN 127-series library modeled dimensions — identical parameters as the online weight calculator and catalog SKUs.
Boundary: theoretical geometric estimates for quotation, freight and packing budgets. Actual piece weight varies with chamfer, split-ring geometry and coating (hot-dip galvanizing ≈ +4.5%); use measured values for trade settlement.
Corresponding standard page
Open the GB/T 97.1 standard product page: sizes, materials and finishes, and ordering questions.
Open the GB/T 97.1 page
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FAQ
How much does an M30 flat washer weigh?
About 55 g per piece on the carbon-steel basis (GB/T 97.1), i.e. about 55 kg per 1,000 pcs. For stainless 304/316 multiply by the density factors ×1.010/×1.017.
How much does an M30 spring washer weigh, and how does it differ from a flat washer?
About 46 g per piece on the carbon-steel basis (DIN 127-series modeled dimensions), i.e. about 46 kg per 1,000 pcs. Both share the same annular-volume formula but differ in dimensions and function: a spring washer resists loosening through its split-ring tension, while a flat washer spreads bearing pressure and protects the mating surface.
What are the outside diameter and thickness of M30 washers?
Flat washer (GB/T 97.1): OD D = 56 mm, thickness t = 4 mm; spring washer (DIN 127 series, modeled): OD D = 49 mm, thickness t = 6 mm. The bore is taken at the nominal diameter 30 mm (the actual clearance hole is slightly larger).
What washers pair with an M30 bolt?
A matching M30 flat washer (GB/T 97.1) plus a spring lock washer (GB/T 93) for anti-loosening; for the mating hex nut (GB/T 6170) see our hex nut weight chart for the same size.
What basis are these weights calculated on?
Annular geometric volume π/4·(D²−d²)·t × density (carbon steel 7.85 g/cm³, base metal, coating excluded; spring washers × 0.83 effective-section allowance), with the bore at the nominal diameter d — the same formula and parameters as the online weight calculator. Theoretical estimates — use measured values for trade settlement.
Related References
Bolt Weight Calculator
Interactive version: bolts, nuts, flat/spring washers and sets at any quantity, material and coating factors — this size is pre-filled.
M30 Hex Nut Weight Chart
Unit and per-1,000-pcs weights of the matching hex nut, with width across flats and height (GB/T 6170 basis).
M30 Hex Bolt Weight Chart
Per-piece and per-1,000-pcs weights across the full length series, including matching nut and washers.
Flat Washer Catalog
GB/T 97.1 flat washers: sizes, materials and coatings — quotation on request.
Spring Lock Washer Catalog
GB/T 93 spring lock washers: sizes, materials and coatings — quotation on request.
Disclaimer: This chart is an engineering estimation for selection, quotation and freight estimation only. It does not constitute design or acceptance criteria.