M20 Turnbuckle are manufactured to ISO / DIN. This page lists the controlling dimensions for the M20 size together with the rated working load limit and the notes for safe installation.
M20 Dimensional Row (ISO / DIN)
Thread size
Total length closed (mm)
Take-up length (mm)
Working load limit (kg)
Material
Reference standard
M20
290
215
1200
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
Common Applications for M20 Turnbuckle — ISO / DIN (Series 156)
M20 Turnbuckle — ISO / DIN (Series 156) are commonly specified for general engineering applications.
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 (ISO / DIN)
Thread size
Total length closed (mm)
Take-up length (mm)
Working load limit (kg)
Material
Reference standard
M6
105
75
80
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
M8
125
90
140
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
M10
150
110
230
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
M12
180
135
340
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
M16
230
170
700
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
M20
290
215
1200
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
M24
355
260
1800
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
M30
420
320
3200
Drop-forged steel, hot-dip galvanized
DIN 1480 / GB/T 5973
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 Turnbuckle — ISO / DIN (Series 156) 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.
What is the coarse-thread pitch of M20 for Turnbuckle — ISO / DIN (Series 156)?
For M20 the standard coarse pitch is 2.5 mm — this is the value used for Turnbuckle — ISO / DIN (Series 156).
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 →
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