The M20 size of Lifting Eye Bolt is dimensioned by GB/T 825 / DIN 580. The table below gives the dimensional row from the standard, followed by the rated working load limit and the notes for safe installation.
M20 Dimensional Row (GB/T 825 / DIN 580)
Size
Pitch (mm)
Length L (mm)
Head diameter dk (mm)
Head height k (mm)
Hex socket s (mm)
Reference standard
M20
2.5
120
30.0
20
17.0
ISO 4762 / GB/T 70.1
Common Applications for M20 Lifting Eye Bolt — GB/T 825 / DIN 580 (Series 037)
M20 Lifting Eye Bolt — GB/T 825 / DIN 580 (Series 037) are commonly specified for heavy assembly and large machine mounts.
Mating Parts for M20
For M20, pair with a M20 hex nut (ISO 4032 / DIN 934) and, where used, a M20 flat washer (ISO 7089 / DIN 125A) under the head and under the 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 (GB/T 825 / DIN 580)
Size
Pitch (mm)
Length L (mm)
Head diameter dk (mm)
Head height k (mm)
Hex socket s (mm)
Reference standard
M3
0.5
20
5.5
3
2.5
ISO 4762 / GB/T 70.1
M4
0.7
25
7.0
4
3.0
ISO 4762 / GB/T 70.1
M5
0.8
30
8.5
5
4.0
ISO 4762 / GB/T 70.1
M6
1.0
40
10.0
6
5.0
ISO 4762 / GB/T 70.1
M8
1.25
50
13.0
8
6.0
ISO 4762 / GB/T 70.1
M10
1.5
60
16.0
10
8.0
ISO 4762 / GB/T 70.1
M12
1.75
80
18.0
12
10.0
ISO 4762 / GB/T 70.1
M14
2.0
80
21.0
14
12.0
ISO 4762 / GB/T 70.1
M16
2.0
100
24.0
16
14.0
ISO 4762 / GB/T 70.1
M18
2.5
100
27.0
18
14.0
ISO 4762 / GB/T 70.1
M20
2.5
120
30.0
20
17.0
ISO 4762 / GB/T 70.1
M24
3.0
150
36.0
24
19.0
ISO 4762 / GB/T 70.1
M30
3.5
180
45.0
30
22.0
ISO 4762 / GB/T 70.1
M36
4.0
200
54.0
36
27.0
ISO 4762 / GB/T 70.1
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 clearance and tapping drill suit M20?
Use a 22 mm clearance hole (ISO 273 medium) for through-fixing, or a 17.5 mm tapping drill for a coarse M20 thread.
Should M20 Lifting Eye Bolt — GB/T 825 / DIN 580 (Series 037) be tightened by torque or by angle?
For critical structural joints at M20, 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 M20 structural bolts?
Grip ranges are highly application-dependent at M20. 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 Allen key fits M20 Lifting Eye Bolt — GB/T 825 / DIN 580 (Series 037)?
The hex-socket size for each row of Lifting Eye Bolt — GB/T 825 / DIN 580 (Series 037) is shown in the spec table — use the matching Allen / hex key. An ISO 2936 set covers every size on this page.
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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