Engineering Data 2.2 / System C

ISO 7089 PLAIN WASHER — DIMENSIONS, WEIGHTS & DIN 125 A EQUIVALENCE

Q: How much does one ISO 7089 washer weigh?

The last column gives the theoretical weight per 1,000 pieces: for example a size 10.5 washer is about 3.57 kg per 1,000 pcs. Values are geometric estimates, not a weighing certificate.

ISO 7089:2000 specifies plain washers, normal series, product grade A, for metric bolts and screws from M1.6 to M36. It is the current international standard behind the legacy DIN 125 A designation, and the two call out the same dimensions — all 29 sizes in our compiled table match. This page gives the complete size table with tolerances and theoretical weight per 1.000 pieces.

1. Standard Identity

Standard

ISO 7089:2000 (2nd edition, current)

Series

Normal series

Product grade

Size range

1.7 mm – 37 mm (for threads M1.6 – M36)

Type

Plain washer, unchamfered

Dimensional equivalent

DIN 125 A (29/29 sizes identical)

2. Dimensions — normal series, M1.6 to M36

Size	For thread	d1 min.	d1 max.	d2 min.	d2 max.	h min.	h max.	Weight kg / 1.000 pcs
1.7	M1.6	1.7	1.84	3.7	4	0.25	0.35	0.024
1.8	M1.7	1.8	1.94	4.2	4.5	0.25	0.35	0.031
2.2	M2	2.2	2.34	4.7	5	0.25	0.35	0.037
2.5	M2.3	2.5	2.64	5.7	6	0.45	0.55	0.092
2.7	M2.5	2.7	2.84	5.7	6	0.45	0.55	0.088
2.8	M2.6	2.8	2.94	6.64	7	0.45	0.55	0.127
3.2	M3	3.2	3.38	6.64	7	0.45	0.55	0.119
3.7	M3.5	3.7	3.88	7.64	8	0.45	0.55	0.155
4.3	M4	4.3	4.48	8.64	9	0.7	0.9	0.308
5.3	M5	5.3	5.48	9.64	10	0.9	1.1	0.443
6.4	M6	6.4	6.62	11.57	12	1.4	1.8	1.02
7.4	M7	7.4	7.62	13.57	14	1.4	1.8	1.39
8.4	M8	8.4	8.62	15.57	16	1.4	1.8	1.83
10.5	M10	10.5	10.77	19.48	20	1.8	2.2	3.57
13	M12	13	13.27	23.48	24	2.3	2.7	6.27
15	M14	15	15.27	27.48	28	2.3	2.7	8.62
17	M16	17	17.27	29.48	30	2.7	3.3	11.3
19	M18	19	19.33	33.38	34	2.7	3.3	14.7
21	M20	21	21.33	36.38	37	2.7	3.3	17.2
23	M22	23	23.33	38.38	39	2.7	3.3	18.3
25	M24	25	25.33	43.38	44	3.7	4.3	32.3
27	M26	27	27.33	49.38	50	3.7	4.3	43.7
28	M27	28	28.33	49.38	50	3.7	4.3	42.3
29	M28	29	29.33	49.38	50	3.7	4.3	40.9
31	M30	31	31.39	55.26	56	3.7	4.3	53.6
33	M32	33	33.62	58.8	60	4.4	5.6	77.4
34	M33	34	34.62	58.8	60	4.4	5.6	75.3
36	M35	36	36.62	64.8	66	4.4	5.6	94.3
37	M36	37	37.62	64.8	66	4.4	5.6	92.1

Dimensions in millimetres. Source: ISO 7089:2000 normal series, product grade A — compiled table (see Sources at the foot of this page). Weight is a theoretical estimate per 1.000 pieces.

3. How to read the table

d1 is the inner diameter — it must clear the thread of the bolt, which is why the washer size is not the same number as the thread size (an M10 bolt uses the 10.5 washer). d2 is the outer diameter and h the thickness; the table gives the minimum and maximum of each. The last column is the theoretical weight per 1.000 pieces, useful for freight and packing estimates — check it against actual weight for pricing. Per-size pages: ISO 7089 size chart. For any other size, use the weight calculator.

4. Materials and finishes

Washers are quoted in carbon steel and stainless steel (A2 / A4). Standard finishes are zinc plating, hot-dip galvanizing, zinc-nickel and dacromet; hardness class and coating class follow the drawing or the order. For stainless grades see mechanical properties, and for coating comparisons see surface treatment.

5. Equivalent standards

Standard	Relationship	Note
DIN 125 A	Dimensionally equivalent (same normal series)	Legacy German designation; 29/29 sizes match in our data
ISO 7090	Chamfered version of the same series	Use when the drawing specifies a chamfer
ASME B18.22.1	Inch series — not interchangeable	Different diameters and thicknesses

6. How to order

State the size (washer size or the thread it fits), material and grade (carbon steel, A2, A4), finish and quantity. If the drawing calls DIN 125 A, say so — the dimensions are the same and we quote either designation.

ISO 7089 plain washer — product page Request a quotation

7. FAQ

Is ISO 7089 the same as DIN 125 A?

Dimensionally yes. In our compiled data all 29 sizes match DIN 125 A size by size (d1, d2, h and weight). DIN 125 A is the legacy German designation; ISO 7089:2000 is the current international standard.

What sizes does ISO 7089 cover?

The normal series runs from washer size 1.7 mm (for M1.6 thread) up to 37 mm (for M36 thread). The table on this page lists every size with its tolerances.

What do d1, d2 and h mean?

d1 is the inner diameter (clearance for the thread), d2 the outer diameter and h the thickness. The table gives the minimum and maximum of each.

Which washer fits an M10 bolt?

Size 10.5: inner diameter 10.5–10.77 mm, outer diameter 19.48–20 mm, thickness 1.8–2.2 mm, about 3.57 kg per 1.000 pieces.

What is the difference between ISO 7089 and ISO 7090?

ISO 7089 is the plain (unchamfered) washer; ISO 7090 is the chamfered version of the same normal series. They are not interchangeable when the chamfer matters.

What material and finish are available?

Carbon steel and stainless steel (A2 / A4). Standard finishes include zinc plating, hot-dip galvanizing and zinc-nickel; hardness class and coating class are confirmed on the drawing or order.

How much does one ISO 7089 washer weigh?

The last column gives the theoretical weight per 1.000 pieces: for example a size 10.5 washer is about 3.57 kg per 1.000 pcs. Values are geometric estimates, not a weighing certificate.

Is DIN 125 A still valid?

DIN 125 A is a legacy designation still widely used on drawings; the current international dimension standard is ISO 7089:2000. Both call out the same washer dimensions.

8. Sources and version

Dimensions and weights: ISO 7089:2000 normal series table, compiled in our data set (source: fasteners.eu, retrieved 2026-10-28), cross-checked against DIN 125 A — 29 of 29 sizes identical. Weight values are theoretical per 1.000 pieces. Page last reviewed: 2026-10-29.