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You should know" DIN 3870 vs ISO 8434-1 tube nut"
History of DIN 3870 and ISO 8434-1 tube nut
DIN is Deutsches Institut für Normungo and was found in 1917(see more info from the link https://www.din.de/en/din-and-our-partners/din-e-v ), it is designed with metric thread of tube nut for 24 degree cone tube connector, the first version of DIN 3870 in 1954, it is non-soldering and soldering compression fittings-union nuts series LL, the versions has 1954-1, 1957-05,1961-08,1965-09,1983-01,1985-05.DIN 3870 2001-09 newest version updated the specifications for S and L series coupling nuts, and for type A nuts for use with cutting rings as in DIN 3861, and 24°cone metric couplings as in DIN 3865 (excluding series LL 3 and LL 1 6 fittings) are now given in DIN EN ISO 8434-1 .
ISO is the International Organization for Standardization and was found in 1947, adherence to the World Trade Organization (WTO) principles for product, process, services, person, system or body, meet technical specifications (TS), publicly available specifications(PAS), international workshop agreements(IWA), see the link: www.iso.org/iso/foreword.html for servicing technical barriers to trade.ISO 8434-1 standard has 1994, 2007 and the newest version of 2018. It is was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 4, Connectors and similar products and components.
ISO 8434-1 is most popular technical standard in worldwide trade business of tube fittings, define the requirement of the metallic tube connections for fluid power and general use part 1: 24°cone connectors.
Metric tube nut difference of dimensions between DIN 3870 and ISO 8434-1
It is covered by ISO 8434-1 standard, excluding LL 3 and 5, also not form B for DIN 3863 (few used in international trade), LL from 6 to 42 is revised to L in ISO 8434-1 standard.
ISO 8434-1 standard of Tube nut sizes, perfect LL series of 8 10 and 12, change LL of DIN 3870 into L of ISO 8431, add S series of 6 to 38.
Part No. Reference of Eaton Winner Parker for DIN tube nut sizes
PART NO. | THERAD E | DIMENSIONS | Cross reference | Weight g/pcs | |||
d | C | S2 | Parker PN | ISO 8434-1 | |||
LL SERIES | |||||||
NLL-08 | M8×1 | 4 | 11 | 10 | M04LL | N04LM8 | 4 |
NLL-10 | M10×1 | 6 | 11.5 | 12 | M06LL | N06LM10 | 6 |
NLL-12 | M12×1 | 8 | 12 | 14 | M08LL | N08LM12 | 7 |
NLL-14 | M14×1 | 10 | 12.5 | 17 | M10LL | N10LM14 | 11 |
NLL-16 | M16×1 | 12 | 13 | 19 | M12LL | N12LM16 | 13 |
L SERIES | |||||||
NL-12 | M12X1.5 | 6 | 14.5 | 14 | M06L | N06LM12 | 10 |
NL-14 | M14X1.5 | 8 | 14.5 | 17 | M08L | N08LM14 | 15 |
NL-16 | M16X1.5 | 10 | 15.5 | 19 | M10L | N10LM16 | 18 |
NL-18 | M18X1.5 | 12 | 15.5 | 22 | M12L | N12LM18 | 25 |
NL-22 | M22X1.5 | 15 | 17 | 27 | M15L | N15LM22 | 42 |
NL-26 | M26X1.5 | 18 | 18 | 32 | M18L | N18LM26 | 62 |
NL-30 | M30X2 | 22 | 20 | 36 | M22L | N22LM30 | 82 |
NL-36 | M36X2 | 28 | 21 | 41 | M28L | N28LM36 | 89 |
NL-45 | M45X2 | 35 | 24 | 50 | M35L | N35LM45 | 137 |
NL-52 | M52X2 | 42 | 24 | 60 | M42L | N42LM52 | 216 |
S SERIES | |||||||
NS-14 | M14X1.5 | 6 | 16.5 | 17 | M06S | N06SM14 | 17 |
NS-16 | M16X1.5 | 8 | 16.5 | 19 | M08S | N08SM16 | 20 |
NS-18 | M18X1.5 | 10 | 17.5 | 22 | M10S | N10SM18 | 31 |
NS-20 | M20X1.5 | 12 | 17.5 | 24 | M12S | N12SM20 | 34 |
NS-22 | M22X1.5 | 14 | 20.5 | 27 | M14S | N14SM22 | 53 |
NS-24 | M24X1.5 | 16 | 20.5 | 30 | M16S | N16SM24 | 66 |
NS-30 | M30X2 | 20 | 24 | 36 | M20S | N20SM30 | 102 |
NS-36 | M36X2 | 25 | 27 | 46 | M25S | N25SM36 | 202 |
NS-42 | M42X2 | 30 | 29 | 50 | M30S | N30SM42 | 219 |
NS-52 | M52X2 | 38 | 32.5 | 60 | M38S | N38SM52 | 339 |
DIN tube nut adjustment and assembly torque of tube fittings
Tube nut assembled with cutting ring and connector, C is measured size after full tightening.
The recommended torque table of DIN tube nut for your reference as below:
TORQUE OF L SERIES FOR TUBE NUT | |||
Size of Tube O.D | Min. tube wall thickness | Nut Thread | Final assembly [Nm] or 30° |
6 | 6 x 1 | M12X1.5 | 25 |
8 | 8 x 1 | M14X1.5 | 40-45 |
10 | 10 x 1 | M16X1.5 | 50-55 |
12 | 12 x 1,5 | M18X1.5 | 70-80 |
15 | 15 x 1,5 | M22X1.5 | 90-100 |
18 | 18 x 1,5 | M26X1.5 | 115-150 |
22 | 22 x 2 | M30X2 | 200-210 |
28 | 28 x 2 | M36X2 | 250-310 |
35 | 35 x 3 | M45X2 | 400-500 |
42 | 42 x 3 | M52X2 | 500-600 |
TORQUE OF S SERIES FOR TUBE NUT | |||
6 | 6 x 2 | M14X1.5 | 35-45 |
8 | 8 x 1,5 | M16X1.5 | 55-60 |
10 | 10 x 1,5 | M18X1.5 | 70-80 |
12 | 12 x 1,5 | M20X1.5 | 85-100 |
14 | 14 x 2 | M22X1.5 | 110-135 |
16 | 16 x 1,5 | M24X1.5 | 120-150 |
20 | 20 x 2 | M30X2 | 200-250 |
25 | 25 x 2,5 | M36X2 | 340-400 |
30 | 30 x 3 | M42X2 | 480-500 |
38 | 38 x 4 | M52X2 | 600-850 |
Usage types of DIN tube nut:
1，Cutting ring (ferrule) usage for connecting hydraulic tube connection of ISO 8434-1 and DIN 3861(1 is body, 2 is tube nut, 3 is cutting ring)
2，Thrust-wire nut usage for swivel o-ring end of tube fittings of ISO 8434-1
3、Nut for clamping the hose fittings(ISO 12151-2 ) and nipple of ISO 8434-4
(1 is hose fitting, 2 is o-ring, 3 is port, 4 is adapter, 5 is tube nut)
4、Parker function nut usage for improve vibration working design of rubber increasing, because add sealing of NBR or FKM rubber material.
5、DIN 3870 tube union nut usage for DIN 3863 of spherical liner sealing of compression couplings of port end U and Y
Ball bushings
Hole shapes for ball bushings
6、DIN 3870 tube nut usage for DIN 2353 compression fittings
(1 is Überwurfmutter union nut, 2 is cutting ring Schneidring, 3 is Gerader Einschraubstutzen Straight screw in connector )
Types of DIN tube Nut in material, machining:
Material types:
Carbon steel: 08AL for LL series, C35 or C45 for L and S series.
Stainless steel: 304/X5CrNi1810(1.4303), 316/X5CrNiMo1712(1.4401), 316L/X2CrNiMo18143(1.4405) and 316Ti/X6CrNiMoTi1712(1.4471)
Material shapes is made of cold forging for below size of 27mm, over 27 to 51mm of hot forging, and hex bar material for small quantity and bigger sizes.
Machining types:
CNC machining precision sizes, and tap thread for small sizes.
Choose your nut with STAMP:
Size range from M6 to M80, can be custom make.
Temperature range for various system and environment from reasonable material types
Application in hazardous and critical of industry custom and service.
Media can be hydraulic flow power and gas etc corrosion, system contamination etc.
Pressure can meet your system rating requirement.
Fitsch’s advantage of metric tube nut
Competitive price with material cost advantage such as cold forging, hot forging.
Quality control with automatic inspection in every piece.
Delivery on time because of our DIN ISO standard of tube nut and union nut.
OEM or ODM service for your need
Work together, make stronger for your tube nut business growth.
Contact with Fitsch for supporting your business of DIN tube nut
