Specification
A coupling nut, also known as extension nut, is a threaded fastener for joining two male threads, most commonly a threaded rod, but also pipes. The outside of the fastener is usually a hex so a wrench can hold it. Variations include reducing coupling nuts, for joining two different size threads; sight hole coupling nuts, which have a sight hole for observing the amount of engagement; and coupling nuts with left-handed threads. These are used to make up long rod assemblies from shorter lengths of rods. The rods are threaded into the coupling nut for a certain distance. Coupling nut dimensions are described by the Industrial Fasteners Institute in standard IFI-128. It is given a plain finish. It is either cold drawn or hot rolled depending on the bar stock used. Coupling nuts threaded with two different thread sizes and profiles are called reducing coupling nuts.
Coupling nuts can be used to tighten a rod assembly inward or to press a rod assembly outward
Metric DIN 6334 Hexagon Coupling Nuts also known as extension nuts are elongated fully threaded hex nuts that often used to join two externally threaded fasteners usually threaded rods. DIN 6334 metric hex nuts have a height of 3 x the major diameter of the thread.
Metric DIN 6334 Ellongated Hexagon Coupling Nuts height 3 x Dia
Equivalent norms: CSN 021604;
Legend:
l - length of nut
s - size of the hexagon
d - the nominal diameter of the thread
Makings:
Steel: 6, 8, 10
Stainless: A2,A4
Plastic: -
Non Ferrous: -
Thread: 6H
Dimensions elongated hexagon nuts DIN 6334 UNIT:mm |
|||
d | L | s | KG/MPCS |
M6 | 18 | 10 | 7 |
M8 | 24 | 13 | 18 |
M10 | 30 | 17 | 42 |
M12 | 36 | 19 | 63 |
M14 | 42 | 22 | 95.5 |
M16 | 48 | 24 | 122 |
M18 | 54 | 27 | 140 |
M20 | 60 | 30 | 240 |
M22 | 66 | 32 | 300 |
M24 | 72 | 36 | 412 |
M27 | 81 | 41 | 608 |
M30 | 90 | 46 | 825 |
M33 | 99 | 50 | 1100 |
M36 | 108 | 55 | 1470 |
Process flow
Cold forging
Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ tapping ➨make heat treatment(if need) ➨ Finish ➨ Packing
Hot forging
Cutting material ➨ hot forging ➨ turning ➨ tapping ➨ make heat treatment(if need) ➨ Finish ➨ Packing
Product Grade
Class 5 Class 6 Class 8 Class 10
Materials and Chemical compstition
1008
CHEMICAL COMPOSI % | ||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | Al |
0.06 | 0.06 | 0.33 | 0.013 | 0.003 | 0.01 | 0 | 0.01 | 0.028 |
1035
CHEMICAL COMPOSI % | |||||||
C | Si | Mn | P | S | Cr | Ni | Cu |
0.34 | 0.13 | 0.73 | 0.012 | 0.002 | 0.02 | 0.01 | 0.02 |
10B21
CHEMICAL COMPOSI % | ||||||
C | Si | Mn | P | S | Cr | B |
0.2 | 0.04 | 0.81 | 0.017 | 0.007 | 0.017 | 0.0021 |
1045
CHEMICAL COMPOSI % | |||||||
C | Si | Mn | P | S | Cr | Ni | Cu |
0.45 | 0.23 | 0.58 | 0.014 | 0.006 | 0.057 | 0.008 | 0.016 |
40CR
CHEMICAL COMPOSI % | |||||||
C | Si | Mn | P | S | Cr | Ni | Cu |
0.4 | 0.21 | 0.54 | 0.015 | 0.008 | 0.95 | 0.02 | 0.02 |
35CRMO
CHEMICAL COMPOSI % | ||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
0.35 | 0.22 | 0.59 | 0.01 | 0.003 | 0.93 | 0.01 | 0.01 | 0.21 |
42CRMO
CHEMICAL COMPOSI % | ||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
0.42 | 0.27 | 0.92 | 0.013 | 0.004 | 1.01 | 0.03 | 0.04 | 0.2 |
Finish
PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON
PACKING
QBH BULK
20-25KG/CTN,36CTNS/PALLET
20-30KG/BAGS,36BAGS/PALLET
ONE TON/BOXES
50KG/ IRON DRUM,12 IRON DRUMS/PALLET
QBH SMALL PACKING
Packing in small boxes according to customer’s requirements
Packing in plastic bag according to customer’s requirements
QBH PALLET TYPE
SOLID WOOD FUMIGATION PALLET
EURO Pallet
THREE SPLINT PALLET
WOODEN BOX
MECHANICAL PROPERTY
TESTING STANDARD:DIN267- 4 OR ISO898-2
SIZE | CLASS | |||||||||||||||||
04 | 05 | |||||||||||||||||
PROOF LOAD N/mm2 |
HV |
NUT | PROOF LOAD N/mm2 |
HV |
NUT | |||||||||||||
> | ≤ | min | max | HEAT TREATMENT | TYPE | min | max | HEAT TREATMENT | TYPE | |||||||||
/ | M4 | 380 | 188 | 302 | NO | THIN NUT | 500 | 272 | 353 | YES | THIN NUT | |||||||
M4 | M7 | |||||||||||||||||
M7 | M10 | |||||||||||||||||
M10 | M16 | |||||||||||||||||
M16 | M39 | |||||||||||||||||
SIZE | CLASS | |||||||||||||||||
4 | 5 | |||||||||||||||||
PROOF LOAD N/mm2 |
HV | NUT | PROOF LOAD N/mm2 |
HV | NUT | |||||||||||||
> | ≤ | min | max | HEAT TREATMENT | TYPE | min | max | HEAT TREATMENT | TYPE | |||||||||
/ | M4 | / | / | / | / | / | 520 | 130 | 302 | NO | 1 | |||||||
M4 | M7 | 580 | ||||||||||||||||
M7 | M10 | 590 | ||||||||||||||||
M10 | M16 | 610 | ||||||||||||||||
M16 | M39 | 510 | 117 | 302 | NO | 1 | 630 | 146 | ||||||||||
SIZE | CLASS | |||||||||||||||||
6 | 8 | |||||||||||||||||
PROOF LOAD N/mm2 |
HV | NUT | PROOF LOAD N/mm2 |
HV | NUT | |||||||||||||
> | ≤ | min | max | HEAT TREATMENT | TYPE | min | max | HEAT TREATMENT | TYPE | |||||||||
/ | M4 | 600 | 150 | 302 | NO | 1 | 800 | 180 | 302 | NO | 1 | |||||||
M4 | M7 | 670 | 855 | 200 | ||||||||||||||
M7 | M10 | 680 | 870 | |||||||||||||||
M10 | M16 | 700 | 880 | |||||||||||||||
M16 | M39 | 720 | 170 | 920 | 233 | 353 | YES | |||||||||||
SIZE | CLASS | |||||||||||||||||
8 | 9 | |||||||||||||||||
PROOF LOAD N/mm2 |
HV | NUT | PROOF LOAD N/mm2 |
HV | NUT | |||||||||||||
> | ≤ | min | max | HEAT TREATMENT | TYPE | min | max | HEAT TREATMENT | TYPE | |||||||||
/ | M4 | / | / | / | / | / | 900 | 170 | 302 | NO | 2 | |||||||
M4 | M7 | 915 | 188 | |||||||||||||||
M7 | M10 | 940 | ||||||||||||||||
M10 | M16 | 950 | ||||||||||||||||
M16 | M39 | 890 | 180 | 302 | NO | 2 | 920 | |||||||||||
SIZE | CLASS | |||||||||||||||||
10 | 12 | |||||||||||||||||
PROOF LOAD N/mm2 |
HV | NUT | PROOF LOAD N/mm2 |
HV | NUT | |||||||||||||
> | ≤ | min | max | HEAT TREATMENT | TYPE | min | max | HEAT TREATMENT | TYPE | |||||||||
/ | M4 | 1040 | 272 | 353 | YES | 1 | 1140 | 295 | 353 | YES | 1 | |||||||
M4 | M7 | 1040 | 1140 | |||||||||||||||
M7 | M10 | 1040 | 1140 | |||||||||||||||
M10 | M16 | 1050 | 1140 | |||||||||||||||
M16 | M39 | 1060 | / | / | / | / | / | |||||||||||
SIZE | CLASS | |||||||||||||||||
12 | ||||||||||||||||||
PROOF LOAD N/mm2 |
HV | NUT | ||||||||||||||||
> | ≤ | min | max | HEAT TREATMENT | TYPE | |||||||||||||
/ | M4 | 1150 | 272 | 353 | YES | 2 | ||||||||||||
M4 | M7 | 1150 | ||||||||||||||||
M7 | M10 | 1160 | ||||||||||||||||
M10 | M16 | 1190 | ||||||||||||||||
M16 | M39 | 1200 |
The advantages of QBH
- QBH brand sales to the main quality assurance.
- Years of export trade management, excellent service, word-of-mouth guarantee.
- By working with TUV,escort for quality.
- Customization of non-standard parts can be made according to customer's requirements and drawings.
- For quality customers,we can provide a certain credit period.
Product application
Often referred to as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.
DIN 6334 Alias
- French (fr): DIN 6334 Écrous hexagonaux – 3D
- German (de): DIN 6334 Sechskantmuttern, 3d hoch
- Italian (it): DIN 6334 Dadi esagonali di prolunga m 3 x d
- Dutch (nl): DIN 6334 Hexagon Noten – 3D
- Czech (cs): DIN 6334 Prodlužovací matice 3D
Metric Medium-Strength Steel Coupling Nuts—Class 8
Often referred to as extension nuts, use these to connect and extend threaded rods. They're comparable in strength to Class 8.8 bolts.
Zinc-plated steel coupling nuts resist corrosion in wet environments.
Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.
Metric High-Strength Steel Coupling Nuts—Class 10
Often referred to as extension nuts, use these to connect and extend threaded rods. Made from Class 10 steel, they're about 25% stronger than medium-strength steel coupling nuts and comparable in strength to Class 10.9 bolts. A zinc plating provides corrosion resistance in wet environments.
Metric Super-Corrosion-Resistant 304 and 316 Stainless Steel Coupling Nuts
Made from 304 and 316 stainless steel, these coupling have excellent resistance to chemicals and salt water. Also known as extension nuts, use them to connect and extend threaded rods. They may be mildly magnetic.