This page covers M30 Spring Lock Washers to ISO 7980 / DIN 127. M30 is the nominal bolt size; the dimensional row below is reproduced from the product table, followed by the tolerance, material and selection notes that apply to this size.
M30 Dimensional Row (ISO 7980 / DIN 127)
For bolt size
Inner diameter d1 min (mm)
Outer diameter d2 max (mm)
Width b (mm)
Thickness s (mm)
Reference standard
M30
30.5
50.0
14.0
6.0
ISO 7980 / DIN 127
Common Applications for M30 Spring Lock Washers
M30 Spring Lock Washers are commonly specified for high-load load-spreading on structural joints.
Mating Parts for M30
A M30 flat washer pairs with a M30 bolt/screw and matching M30 nut.
Technical Drawing
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
Sends the selected values to the quote form below.
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The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (ISO 7980 / DIN 127)
For bolt size
Inner diameter d1 min (mm)
Outer diameter d2 max (mm)
Width b (mm)
Thickness s (mm)
Reference standard
M2
2.1
4.4
1.6
0.5
ISO 7980 / DIN 127
M2.5
2.6
5.1
2.0
0.6
ISO 7980 / DIN 127
M3
3.1
6.2
2.0
0.8
ISO 7980 / DIN 127
M3.5
3.6
7.0
2.5
0.8
ISO 7980 / DIN 127
M4
4.1
7.6
2.5
1.0
ISO 7980 / DIN 127
M5
5.1
9.2
3.0
1.2
ISO 7980 / DIN 127
M6
6.1
11.8
4.0
1.6
ISO 7980 / DIN 127
M7
7.1
13.1
4.0
1.6
ISO 7980 / DIN 127
M8
8.1
14.8
5.0
2.0
ISO 7980 / DIN 127
M10
10.2
18.1
6.0
2.2
ISO 7980 / DIN 127
M12
12.2
21.1
7.0
2.5
ISO 7980 / DIN 127
M14
14.2
24.1
8.0
3.0
ISO 7980 / DIN 127
M16
16.2
27.4
9.0
3.5
ISO 7980 / DIN 127
M18
18.2
29.4
9.0
3.5
ISO 7980 / DIN 127
M20
20.2
33.6
10.0
4.0
ISO 7980 / DIN 127
M22
22.5
35.9
11.0
4.0
ISO 7980 / DIN 127
M24
24.5
40.1
12.0
5.0
ISO 7980 / DIN 127
M27
27.5
44.8
12.0
5.0
ISO 7980 / DIN 127
M30
30.5
50.0
14.0
6.0
ISO 7980 / DIN 127
M36
36.5
60.0
16.0
7.0
ISO 7980 / DIN 127
Materials & Grades
Select a material class to see the grades we supply it in. Each designation is listed with its ISO/EN, AISI/SAE, JIS and GB equivalents.
Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.
Inside the plant
Manufactured in our own plant
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
01
Cold heading
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
02
Thread rolling
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
03
Heat treatment
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
04
Surface treatment
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.
Frequently Asked Questions
What grip range is typical for M30 structural bolts?
Grip ranges are highly application-dependent at M30. As a guide, choose a length that gives at least 1× the thread diameter engagement in the nut plus 2–3 thread pitches projecting.
Which washer dimensions matter most for M30?
For a flat washer, the outside diameter (the bearing surface) and the thickness control how the load is spread under the head and how much elastic preload is preserved. The inside diameter must clear the bolt body but not be so large that the head bears mostly on the washer's outer rim.
What is the coarse-thread pitch of M30 for Spring Lock Washers?
For M30 the standard coarse pitch is 3.5 mm — this is the value used for Spring Lock Washers.
What clearance and tapping drill suit M30?
Use a 33 mm clearance hole (ISO 273 medium) for through-fixing, or a 26.5 mm tapping drill for a coarse M30 thread.
How do I request a quotation?
Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.
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