This page covers M30 Fender Washers to DIN 9021. 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 (DIN 9021)
For bolt size
Inner diameter d1 min (mm)
Outer diameter d2 max (mm)
Thickness h (mm)
Reference standard
Notes
M30
31.0
90.0
6.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
Common Applications for M30 Fender Washers
M30 Fender 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.
Request a Quote
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (DIN 9021)
For bolt size
Inner diameter d1 min (mm)
Outer diameter d2 max (mm)
Thickness h (mm)
Reference standard
Notes
M3
3.2
9.0
0.8
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M4
4.3
12.0
1.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M5
5.3
15.0
1.2
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M6
6.4
18.0
1.6
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M8
8.4
24.0
2.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M10
10.5
30.0
2.5
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M12
13.0
37.0
3.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M14
15.0
44.0
3.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M16
17.0
50.0
3.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M20
21.0
60.0
4.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M24
25.0
72.0
5.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M30
31.0
90.0
6.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
M36
37.0
110.0
8.0
DIN 9021 / ISO 7093
Oversized OD for bearing on soft materials
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 is the coarse-thread pitch of M30 for Fender Washers?
For M30 the standard coarse pitch is 3.5 mm — this is the value used for Fender 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.
Should M30 Fender Washers be tightened by torque or by angle?
For critical structural joints at M30, angle-controlled or stretch-controlled tightening is more repeatable than pure torque — the friction scatter at large diameters can dominate the torque signal.
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.
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.
Need a fastener quote or a spec sheet?Message our engineers on WhatsApp — send a drawing or DIN number and get pricing back fast.Start WhatsApp Chat →
This website uses only necessary and functional cookies to operate, secure, and improve basic website performance.
We do not use advertising cookies, Google Analytics, or cross-site tracking technologies.
Privacy Policy
