M16 Helical Thread Inserts are manufactured to DIN 8140. This page lists the controlling dimensions for the M16 size together with the installation notes for this type.
M16 Dimensional Row (DIN 8140)
Thread size
Pitch (mm)
Length (mm)
Drill / tap size (mm)
Free coil diameter (mm)
Reference standard
Notes
M16
2.0
24.0
16.5 (STI tap)
17.71
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
Common Applications for M16 Helical Thread Inserts
M16 Helical Thread Inserts 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 (DIN 8140)
Thread size
Pitch (mm)
Length (mm)
Drill / tap size (mm)
Free coil diameter (mm)
Reference standard
Notes
M3
0.5
4.5
3.1 (STI tap)
3.45
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M3
0.5
6.0
3.1 (STI tap)
3.45
DIN 8140 / ISO 10130
Wire thread insert, 2xD length; tang break-off
M4
0.7
6.0
4.2 (STI tap)
4.57
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M4
0.7
8.0
4.2 (STI tap)
4.57
DIN 8140 / ISO 10130
Wire thread insert, 2xD length; tang break-off
M5
0.8
7.5
5.3 (STI tap)
5.67
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M5
0.8
10.0
5.3 (STI tap)
5.67
DIN 8140 / ISO 10130
Wire thread insert, 2xD length; tang break-off
M6
1.0
9.0
6.3 (STI tap)
6.80
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M6
1.0
12.0
6.3 (STI tap)
6.80
DIN 8140 / ISO 10130
Wire thread insert, 2xD length; tang break-off
M8
1.25
12.0
8.4 (STI tap)
9.01
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M8
1.25
16.0
8.4 (STI tap)
9.01
DIN 8140 / ISO 10130
Wire thread insert, 2xD length; tang break-off
M10
1.5
15.0
10.5 (STI tap)
11.26
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M10
1.5
20.0
10.5 (STI tap)
11.26
DIN 8140 / ISO 10130
Wire thread insert, 2xD length; tang break-off
M12
1.75
18.0
12.6 (STI tap)
13.51
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M12
1.75
24.0
12.6 (STI tap)
13.51
DIN 8140 / ISO 10130
Wire thread insert, 2xD length; tang break-off
M16
2.0
24.0
16.5 (STI tap)
17.71
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
M20
2.5
30.0
20.5 (STI tap)
22.07
DIN 8140 / ISO 10130
Wire thread insert, 1.5xD length; tang break-off
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 M16 for Helical Thread Inserts?
For M16 the standard coarse pitch is 2 mm — this is the value used for Helical Thread Inserts.
What clearance and tapping drill suit M16?
Use a 17.5 mm clearance hole (ISO 273 medium) for through-fixing, or a 14 mm tapping drill for a coarse M16 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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