M42 Studs & Threaded Rods are manufactured to DIN 939 / DIN 975 with a coarse thread pitch of the standard value. This page lists the controlling dimensions for the M42 size — head geometry, width across flats, matching spanner size — together with the clearance hole, tapping drill and tightening torque used at assembly.
M42 Dimensional Row (DIN 939 / DIN 975)
Thread size
Pitch (mm)
Point type
Common lengths (mm)
Reference standard
Notes
M42
4.5
M42
80~300
DIN 940
Stud, equal thread both ends
Common Applications for M42 Studs & Threaded Rods
M42 Studs & Threaded Rods are commonly specified for structural steelwork, heavy machinery foundations and large flange joints.
Mating Parts for M42
For M42, pair with a M42 hex nut (ISO 4032 / DIN 934) and, where used, a M42 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 (DIN 939 / DIN 975)
Thread size
Pitch (mm)
Point type
Common lengths (mm)
Reference standard
Notes
M4
0.7
M4
10~100
DIN 939
Stud, equal thread both ends
M5
0.8
M5
10~120
DIN 939
Stud, equal thread both ends
M6
1.0
M6
12~160
DIN 939
Stud, equal thread both ends
M8
1.25
M8
16~200
DIN 939
Stud, equal thread both ends
M10
1.5
M10
20~250
DIN 939
Stud, equal thread both ends
M12
1.75
M12
25~300
DIN 939
Stud, equal thread both ends
M14
2.0
M14
30~300
DIN 939
Stud, equal thread both ends
M16
2.0
M16
35~300
DIN 939
Stud, equal thread both ends
M18
2.5
M18
40~300
DIN 939
Stud, equal thread both ends
M20
2.5
M20
45~300
DIN 939
Stud, equal thread both ends
M22
2.5
M22
50~300
DIN 939
Stud, equal thread both ends
M24
3.0
M24
50~300
DIN 939
Stud, equal thread both ends
M27
3.0
M27
55~300
DIN 939
Stud, equal thread both ends
M30
3.5
M30
60~300
DIN 939
Stud, equal thread both ends
M36
4.0
M36
70~300
DIN 939
Stud, equal thread both ends
M42
4.5
M42
80~300
DIN 940
Stud, equal thread both ends
M48
5.0
M48
90~300
DIN 940
Stud, equal thread both ends
M4
0.7
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M5
0.8
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M6
1.0
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M8
1.25
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M10
1.5
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M12
1.75
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M16
2.0
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M20
2.5
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M24
3.0
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
M30
3.5
Fully threaded
1000/2000/3000
DIN 975
Fully threaded rod, cut to length
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
Should M42 Studs & Threaded Rods be tightened by torque or by angle?
For critical structural joints at M42, 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 M42 structural bolts?
Grip ranges are highly application-dependent at M42. 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 →
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