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DIN 25201 Dual Lock Washers

DIN 25201 Nord-Lock-style dual lock washers — paired cam-surface washers sizes 3 to 130 (with the source's ① inch-designated and ② Large Type variants), the wedge-effect pair that locks a bolt against rotation, with the collected bore/OD/thickness ladder in steel and stainless and kg/1000 figures.

Last updated: 2026-11

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DIN 25201 Dual Lock Washers in an industrial setting
Illustrative image redrawn from real product references — not a photograph of stocked items.

Specifications

DIN 25201 is the paired cam lock washer: two washers used as a set, each with radial cam ramps on one face and ratchet teeth on the other — outer teeth grip the bolt head and joint face, and the steeper cam ramps between the pair force the bolt to climb rather than turn loose, so vibration increases clamp instead of undoing it. The collected ladder is the widest in this catalog's washer family: sizes 3 → 130 across 23 sub-tables, including the source's ② Large Type variants (larger outside diameter at the same bore for soft or slotted surfaces) and the ① inch-designated sizes (1/4, 3/8, 1/2, 3/4, 1) with the source's own inch-mark character, plus a Metric/Inch bolt-size mapping row per table. Thickness is tabulated separately for Steel and Stainless Steel (the stainless set runs thicker — 2.2 mm versus 1.8 mm nominal at the small end), and each carries its own ± kg/1000 mass row. Install as a pair, cams face-to-face, teeth outward; read bore, outside diameter and thickness off the table for the seat and clearance checks. The source tabulates geometry and mass only — proof load, hardness and coating stay per RFQ (state the joint's vibration duty and any finish at quotation).

Standard DIN 25201 — dual lock washers (paired cam-surface washers, sold and installed as sets)
Size range Sizes 3 – 130 (metric), plus ① inch-designated sizes 1/4 – 1 and ② Large Type variants per the source notation
Bore diameter d: max/min per size (e.g. size 8: 8.8 max / 8.6 min)
Outside diameter dc: Nominal Size/max/min per size, ② Large Type columns carry their own dc ladder
Thickness h: tabulated separately for Steel and Stainless Steel (e.g. size 3: steel 1.8 / stainless 2.2 nominal)
Weight per 1000 units≈kg③ rows per material carried verbatim
Proof load / hardness Not tabulated by the collected specification — per RFQ
DIN 25201 dual lock washers - attribute rows per size (3 - 3.5 Large②)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size33.53.5 Large②
Bolt size — MetricM3M3.5M3.5
Inch#5#6#6
d — max3.544
min3.33.83.8
dc — Nominal Size77.69
max7.27.89.2
min6.87.48.8
h — Steel — Nominal Size1.81.81.8
max2.052.052.05
min1.551.551.55
per 1000 units≈kg③ — Steel — ≈0.30.40.6
h — Stainless Steel — Nominal Size2.22.22.2
max2.452.452.45
min1.951.951.95
per 1000 units≈kg③ — Stainless Steel — ≈0.40.40.7
DIN 25201 dual lock washers - attribute rows per size (4 - 5)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size44 Large②5
Bolt size — MetricM4M4M5
Inch#8#8#10
d — max4.54.55.5
min4.34.35.3
dc — Nominal Size7.699
max7.89.29.2
min7.48.88.8
h — Steel — Nominal Size1.81.81.8
max2.052.052.05
min1.551.551.55
per 1000 units≈kg③ — Steel — ≈0.40.60.5
h — Stainless Steel — Nominal Size2.22.22.2
max2.452.452.45
min1.951.951.95
per 1000 units≈kg③ — Stainless Steel — ≈0.40.70.6
DIN 25201 dual lock washers - attribute rows per size (5 Large② - 6 Large②)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size5 Large②66 Large②
Bolt size — MetricM5M6M6
Inch#10--
d — max5.56.66.6
min5.36.46.4
dc — Nominal Size10.810.813.5
max111113.7
min10.610.613.3
h — Steel — Nominal Size1.81.82.5
max2.052.052.75
min1.551.552.25
per 1000 units≈kg③ — Steel — ≈1.10.72
h — Stainless Steel — Nominal Size2.22.22
max2.452.452.25
min1.951.951.75
per 1000 units≈kg③ — Stainless Steel — ≈1.10.91.6
DIN 25201 dual lock washers - attribute rows per size (1/4① - 8)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size1/4①1/4 Large① ②8
Bolt size — Metric--M8
Inch1/4”1/4”5/16”
d — max7.37.38.8
min7.17.18.6
dc — Nominal Size11.513.513.5
max11.713.713.7
min11.313.313.3
h — Steel — Nominal Size2.52.52.5
max2.752.752.75
min2.252.252.25
per 1000 units≈kg③ — Steel — ≈0.81.81.5
h — Stainless Steel — Nominal Size2.22.22
max2.452.452.25
min1.951.951.75
per 1000 units≈kg③ — Stainless Steel — ≈0.91.51.2
  • Row 1 (Bolt size — Metric): The size columns of this table are the source's inch-designated series (① footnote): tokens such as "1/4”" carry the source's own inch-mark character (a right double-quote, not the ASCII inch mark) and "1/4 Large① ②" carries both markers verbatim — not normalized.
DIN 25201 dual lock washers - attribute rows per size (8 Large② - 3/8 Large ①②)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size8 Large②3/8①3/8 Large ①②
Bolt size — MetricM8--
Inch5/16”3/8”3/8”
d — max8.810.510.5
min8.610.110.1
dc — Nominal Size16.616.621
max16.816.821.2
min16.416.420.8
h — Steel — Nominal Size2.52.52.5
max2.752.752.75
min2.252.252.25
per 1000 units≈kg③ — Steel — ≈2.82.34.8
h — Stainless Steel — Nominal Size222
max2.252.252.25
min1.751.751.75
per 1000 units≈kg③ — Stainless Steel — ≈2.31.93.8
DIN 25201 dual lock washers - attribute rows per size (10 - 11)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size1010 Large②11
Bolt size — MetricM10M10M11
Inch--7/16”
d — max10.910.911.6
min10.510.511.2
dc — Nominal Size16.62118.5
max16.821.218.7
min16.420.818.3
h — Steel — Nominal Size2.52.52.5
max2.752.752.75
min2.252.252.25
per 1000 units≈kg③ — Steel — ≈2.24.72.9
h — Stainless Steel — Nominal Size222.2
max2.252.252.45
min1.751.751.95
per 1000 units≈kg③ — Stainless Steel — ≈1.83.72.6
DIN 25201 dual lock washers - attribute rows per size (12 - 1/2①)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size1212 Large②1/2①
Bolt size — MetricM12M12-
Inch--1/2”
d — max13.213.213.7
min12.812.813.3
dc — Nominal Size19.525.419.5
max19.725.619.7
min19.325.219.3
h — Steel — Nominal Size2.53.42.5
max2.753.652.75
min2.253.152.25
per 1000 units≈kg③ — Steel — ≈2.99.32.7
h — Stainless Steel — Nominal Size232
max2.253.252.25
min1.752.751.75
per 1000 units≈kg③ — Stainless Steel — ≈2.38.22.2
DIN 25201 dual lock washers - attribute rows per size (1/2 Large① ② - 14 Large②)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size1/2 Large① ②1414 Large②
Bolt size — Metric-M14M14
Inch1/2”9/16”9/16”
d — max13.715.415.4
min13.31515
dc — Nominal Size25.42330.7
max25.623.230.9
min25.222.830.5
h — Steel — Nominal Size3.43.43.4
max3.653.653.65
min3.153.153.15
per 1000 units≈kg③ — Steel — ≈95.614.1
h — Stainless Steel — Nominal Size3.233.2
max3.453.253.45
min2.952.752.95
per 1000 units≈kg③ — Stainless Steel — ≈84.913.1
DIN 25201 dual lock washers - attribute rows per size (16 - 18)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size1616 Large②18
Bolt size — MetricM16M16M18
Inch5/8”5/8”-
d — max17.217.219.7
min16.816.819.3
dc — Nominal Size25.430.729
max25.630.929.2
min25.230.528.8
h — Steel — Nominal Size3.43.43.4
max3.653.653.65
min3.153.153.15
per 1000 units≈kg③ — Steel — ≈6.712.88.9
h — Stainless Steel — Nominal Size33.23.2
max3.253.453.45
min2.752.952.95
per 1000 units≈kg③ — Stainless Steel — ≈5.911.38
DIN 25201 dual lock washers - attribute rows per size (18 Large② - 3/4 Large① ②)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size18 Large②3/4①3/4 Large① ②
Bolt size — MetricM18--
Inch-3/4”3/4”
d — max19.720.220.2
min19.319.819.8
dc — Nominal Size34.530.739
max34.730.939.2
min34.330.538.8
h — Steel — Nominal Size3.43.43.4
max3.653.653.65
min3.153.153.15
per 1000 units≈kg③ — Steel — ≈15.810.522.1
h — Stainless Steel — Nominal Size3.23.23.2
max3.453.453.45
min2.952.952.95
per 1000 units≈kg③ — Stainless Steel — ≈15.69.621
DIN 25201 dual lock washers - attribute rows per size (20 - 22)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size2020 Large②22
Bolt size — MetricM20M20M22
Inch--7/8”
d — max21.621.623.6
min21.221.223.2
dc — Nominal Size30.73934.5
max30.939.234.7
min30.538.834.3
h — Steel — Nominal Size3.43.43.4
max3.653.653.65
min3.153.153.15
per 1000 units≈kg③ — Steel — ≈9.320.912.5
h — Stainless Steel — Nominal Size33.23.2
max3.253.453.45
min2.752.952.95
per 1000 units≈kg③ — Stainless Steel — ≈8.220.612.3
DIN 25201 dual lock washers - attribute rows per size (22 Large② - 24 Large②)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size22 Large②2424 Large②
Bolt size — MetricM22M24M24
Inch7/8”--
d — max23.625.525.5
min23.225.125.1
dc — Nominal Size423948.5
max42.239.248.7
min41.838.848.3
h — Steel — Nominal Size4.63.44.6
max4.853.654.85
min4.353.154.35
per 1000 units≈kg③ — Steel — ≈31.917.445.1
h — Stainless Steel — Nominal Size3.23.23.2
max3.453.453.45
min2.952.952.95
per 1000 units≈kg③ — Stainless Steel — ≈22.215.935
DIN 25201 dual lock washers - attribute rows per size (1① - 27)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size1①1 Large① ②27
Bolt size — Metric--M27
Inch1”1”-
d — max28.128.128.6
min27.727.728.2
dc — Nominal Size3948.542
max39.348.842.3
min38.748.241.7
h — Steel — Nominal Size3.44.65.8
max3.654.856.05
min3.154.355.55
per 1000 units≈kg③ — Steel — ≈15.34231.4
h — Stainless Steel — Nominal Size3.23.26.8
max3.23.26.8
min2.72.76.3
per 1000 units≈kg③ — Stainless Steel — ≈14.227.934.5
DIN 25201 dual lock washers - attribute rows per size (27 Large② - 30 Large②)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size27 Large②3030 Large②
Bolt size — MetricM27M30M30
Inch-1 1/8”1 1/8”
d — max28.631.631.6
min28.231.231.2
dc — Nominal Size48.54758.5
max48.847.358.8
min48.246.758.2
h — Steel — Nominal Size5.85.86.6
max6.056.056.6
min5.555.556.1
per 1000 units≈kg③ — Steel — ≈52.74185.8
h — Stainless Steel — Nominal Size6.86.86.8
max6.86.86.8
min6.36.36.3
per 1000 units≈kg③ — Stainless Steel — ≈53.444.991.8
DIN 25201 dual lock washers - attribute rows per size (33 - 36)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size3333 Large②36
Bolt size — MetricM33M33M36
Inch1 1/4”1 1/4”1 3/8”
d — max34.634.637.6
min34.234.237.2
dc — Nominal Size48.558.555
max48.858.855.3
min48.258.254.7
h — Steel — Nominal Size5.86.65.8
max6.056.66.05
min5.556.15.55
per 1000 units≈kg③ — Steel — ≈38.98054.9
h — Stainless Steel — Nominal Size6.8/6.8
max6.8/6.8
min6.3/6.3
per 1000 units≈kg③ — Stainless Steel — ≈42.8/59.6
DIN 25201 dual lock washers - attribute rows per size (36 Large② - 42)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size36 Large②3942
Bolt size — MetricM36M39M42
Inch1 3/8”1 1/2”-
d — max37.640.643.4
min37.240.243
dc — Nominal Size6358.563
max63.358.863.3
min62.758.262.7
h — Steel — Nominal Size6.65.85.8
max6.66.056.05
min6.15.555.55
per 1000 units≈kg③ — Steel — ≈91.558.979.7
h — Stainless Steel — Nominal Size/6.86.8
max/6.86.8
min/6.36.3
per 1000 units≈kg③ — Stainless Steel — ≈/67.475
DIN 25201 dual lock washers - attribute rows per size (45 - 52)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size454852
Bolt size — MetricM45M48M52
Inch1 3/4”-2”
d — max46.750.154.1
min46.249.653.6
dc — Nominal Size707580
max707580
min687378
h — Steel — Nominal Size777
max7.757.757.75
min6.256.256.25
per 1000 units≈kg③ — Steel — ≈102120130
h — Stainless Steel — Nominal Size6.86.89
max7.557.559.75
min6.056.058.25
per 1000 units≈kg③ — Stainless Steel — ≈102120180.4
DIN 25201 dual lock washers - attribute rows per size (56 - 64)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size566064
Bolt size — MetricM56M60M64
Inch2 1/4”-2 1/2”
d — max59.663.667.6
min59.163.167.1
dc — Nominal Size859095
max859095
min838893
h — Steel — Nominal Size777
max7.757.757.75
min6.256.256.25
per 1000 units≈kg③ — Steel — ≈135152167
h — Stainless Steel — Nominal Size999
max9.759.759.75
min8.258.258.25
per 1000 units≈kg③ — Stainless Steel — ≈213235258
DIN 25201 dual lock washers - attribute rows per size (68 - 76)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size687276
Bolt size — MetricM68M72M76
Inch--3”
d — max71.675.679.6
min71.175.179.1
dc — Nominal Size100105110
max100105110
min98103108
h — Steel — Nominal Size9.59.59.5
max10.2510.2510.25
min8.758.758.75
per 1000 units≈kg③ — Steel — ≈282307333
h — Stainless Steel — Nominal Size999
max9.759.759.75
min8.258.258.25
per 1000 units≈kg③ — Stainless Steel — ≈282307333
DIN 25201 dual lock washers - attribute rows per size (80 - 90)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size808590
Bolt size — MetricM80M85M90
Inch3 1/8”--
d — max83.688.692.9
min83.188.192.4
dc — Nominal Size115120130
max115120130
min113118128
h — Steel — Nominal Size9.59.59.5
max10.2510.2510.25
min8.758.758.75
per 1000 units≈kg③ — Steel — ≈360378477
h — Stainless Steel — Nominal Size9//
max9.75//
min8.25//
per 1000 units≈kg③ — Stainless Steel — ≈360//
DIN 25201 dual lock washers - attribute rows per size (95 - 105)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size95100105
Bolt size — MetricM95M100M105
Inch-4”-
d — max97.9103.9108.9
min97.4103.4108.4
dc — Nominal Size135145150
max135145150
min133143148
h — Steel — Nominal Size9.59.59.5
max10.2510.2510.25
min8.758.758.75
per 1000 units≈kg③ — Steel — ≈498589613
h — Stainless Steel — Nominal Size///
max///
min///
per 1000 units≈kg③ — Stainless Steel — ≈///
DIN 25201 dual lock washers - attribute rows per size (110 - 120)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size110115120
Bolt size — MetricM110M115M120
Inch---
d — max113.9118.9123.9
min113.4118.4123.4
dc — Nominal Size155165170
max155165170
min153163168
h — Steel — Nominal Size9.59.59.5
max10.2510.2510.25
min8.758.758.75
per 1000 units≈kg③ — Steel — ≈635753779
h — Stainless Steel — Nominal Size///
max///
min///
per 1000 units≈kg③ — Stainless Steel — ≈///
DIN 25201 dual lock washers - attribute rows per size (125 - 130)All dimensions in millimetres. Source footnotes, carried: ① = The specification is in inches.; ② = Large Type; ③ = the mass row "per 1000 units≈kg③" ("the weight of each thousand sets of washers"). Attribute labels: d = bore (max/min); dc = outside diameter (Nominal Size/max/min); h = thickness, tabulated separately for Steel and Stainless Steel; the Inch row maps each size to its inch-bolt equivalent (① sizes are inch-designated). Size tokens such as "Large②" and "3/8 Large ①②" are the source's own notation, carried verbatim.
Size125130
Bolt size — MetricM125M130
Inch-5”
d — max128.9133.9
min128.4133.4
dc — Nominal Size173178
max173178
min171176
h — Steel — Nominal Size9.59.5
max10.2510.25
min8.758.75
per 1000 units≈kg③ — Steel — ≈766792
h — Stainless Steel — Nominal Size//
max//
min//
per 1000 units≈kg③ — Stainless Steel — ≈//

Materials

  • Steel and stainless steel tabulated by the source (thickness and mass differ per material); coating and hardness per RFQ — state the corrosion duty and vibration environment at quotation

Ordering & documentation

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

  • The fastener family (DIN 25201 Dual Lock Washers) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
  • Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
  • Quantity per size and your target delivery date.
  • Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

Frequently asked questions

What do the ①, ② and ③ markers in the table mean?

They are the source's own footnotes, carried verbatim on the page: ① marks the sizes whose specification is in inches (1/4, 3/8, 1/2, 3/4, 1 — quoted with the source's inch-mark character), ② marks the Large Type variants (same bore, larger outside diameter, for soft or oversized seating surfaces), and ③ marks the mass rows ("per 1000 units≈kg③", the weight of a thousand sets). A size token like "3/8 Large ①②" is therefore the large-type washer for a 3/8-inch bolt. Order by the token your drawing names — Large Type is not interchangeable with the plain size in a bearing check, because the outside diameter and thickness ladders differ — and quote hardness and finish per RFQ, since the collected tables fix geometry and mass only.

Related knowledge

Request a Quote

Get factory-direct pricing from the manufacturer.

What to include in your inquiry

  • ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
  • ✓ Sizes, lengths and thread type (metric or inch).
  • ✓ Quantity per size and your target delivery date.
  • ✓ Destination country, plus any coating or finish requirement.
  • ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
  • ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
  • ✓ Factory-direct pricing
  • ✓ Standard and custom specifications
  • ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
  • ✓ Full fastener family support

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