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Carbon Steel Coupling Nut

We manufacturer fasteners with size range from M10 to M100  Hex Nuts, Heavy Hex Nut, Cap Nut, Acorn Nut, Serrated Flange Nut, Coupling Nut, Square Nut, Castle Nut, Wing Nut, Flange Lock Nut, Flex Lock Nut, High Nut, Kep Nut, Jam Nut, Nylon Lock Nut, Slotted Nut, Reversible Lock Nut, Custom Nut, T Nuts & other customized Nuts as per Client's requirement.We produce Hot Forged and Coled Formed Nuts Fasteners.

Coupling Nuts

Coupling Nut Applications

Coupling nuts are used to make up long tie rod assemblies from shorter lengths of rod and to facilitate assembly of two fasteners or fittings which each have external threads.

Relevant Standards

Coupling nut dimensions are described by the Industrial Fasteners Institute in standard IFI-128. Chemical and mechanical properties are controlled in conformance with ASTM and SAE nut specifications (ASTM A563, ASTM A194 and SAE J995).

Materials

Standard coupling nuts are produced from ASTM A108 grade 12L14 hexagon or round bars with 50 Ksi minimum yield strength. Other available materials include 1045, 4140, structural grades and stainless steels.

Finishes

Standard finish is plain with either a cold drawn or hot rolled mill finish, depending on the type of bar stock used. Hot dip galvanizing is available as well as zinc electroplating.

Threads

Standard threads are UNC 2B, RH, with other thread series and profiles available by special order. Hot dip galvanized coupling nuts are normally tapped oversize after galvanizing to accommodate the zinc coating on the rod threads. Coupling nuts up to 1-1/2" thread size are tapped all the way through from one end, allowing them to be completely threaded on to one of the members which are to be coupled, a feature that is required for certain assembly situations. Coupling nuts larger than 1-1/2" thread size cannot be tapped all the way through without special extended length taps and are therefore furnished with RH/RH threads (tapped to a depth of L/2 from each end) unless specifically ordered as 'threaded all the way through'.

Coupling nuts can also be threaded with two different thread sizes or profiles. These parts are normally identified as 'reducing coupling nuts'.

Dimensions

Refer to the coupling nut table for dimensions. Some of the sizes listed in this table have an 'Across Flats Size' slightly larger than that called for by IF-128 due to commercial availability of hexagon bar stock. Because of limited availability of hex stock larger than 3-1/2", coupling nuts with thread sizes 2-1/2" and larger are usually made from round bar.

Carbon Steel

IdentificationGrade MarkSpecificationFastenerDescriptionMaterialNominal SizeRange (in.)Mechanical Properties
Proof
Load
(psi)
Yield
Strength
Min (psi)
Tensile
Strength
Min (psi)
hhhhhhhhhhhNoGradeMarkSAE J429Grade 1Bolts,Screws,StudsLow or
Medium Carbon Steel
1/4 thru
1-1/2
33,00036,00060,000
ASTM A307Grades A&BLow Carbon
Steel
1/4 thru 4
SAE J429Grade 2Low or
Medium Carbon Steel
1/4 thru
3/4 Over 3/4 to 1-1/2
55,00033,00057,00036,00074,00060,000
hhhhhhhhhhhNoGradeMarkSAE J429Grade 4StudsMedium
Carbon Cold Drawn Steel
1/4 thru
1-1/2
100,000115,000
hhhhhhhhhhhB5ASTM A193Grade B5AISI 5011/4 Thru 480,000100,000
hhhhhhhhhhhB6ASTM A193Grade B6AISI 41085,000110,000
hhhhhhhhhhhB7ASTM A193Grade B7AISI 4140,
4142, OR 4105
1/4 thru 2-1/2Over 2-1/2 thru 4Over 4 thru 7—-105,00095,00075,000125,000115,000100,000
hhhhhhhhhhhB16ASTM A193Grade B16CrMoVa
Alloy Steel
105,00095,00085,000125,000115,000100,000
hhhhhhhhhhhB8ASTM A193Grade B8AISI 3041/4 and larger30,00075,000
hhhhhhhhhhhB8CASTM A193Grade B8CAISI 347
hhhhhhhhhhhB8MASTM A193Grade B8MAISI 316
hhhhhhhhhhhB8TASTM A193Grade B8TBolts,Screws,Studs for High-Temperature ServiceAISI 3211/4 and
larger
30,00075,000
hhhhhhhhhhhB8ASTM A193Grade B8AISI 304Strain Hardened1/4 thr 3/4Over 3/4 thru 1Over 1 thru 1-1/4Over 1-1/4 thru 1-1/2——100,00080,00065,000

50,000

125,000115,000105,00

0100,000

hhhhhhhhhhhB8CASTM A193Grade B8CAISI 347Strain Hardened
hhhhhhhhhhhB8MASTM A193Grade B8MAISI 316Strain Hardened95,00080,00065,000

50,000

110,000100,00095,00

090,000

hhhhhhhhhhhB8TASTM A193Grade B8TAISI 321Strain Hardened100,00080,00065,000

50,000

125,000115,000105,000

100,000

hhhhhhhhhhhL7ASTM A320Grade L7Bolts,Screws,Studs for Low-Temperature ServiceAISI 4140,4142 or 41451/4 thru 2-1/2 105,000125,000
hhhhhhhhhhhL7AASTM A320Grade L7AAISI 4037
hhhhhhhhhhhL7BASTM A320Grade L7BAISI 4137
hhhhhhhhhhhL7CASTM A320Grade LC7AISI 8740
hhhhhhhhhhhL43ASTM A320Grade L43AISI 43401/4 thru 4105,000125,000
hhhhhhhhhhhB8ASTM A320Grade B8Bolts,Screws,Studs for Low-Temperature ServiceAISI 3041/4 and larger30,00075,000
hhhhhhhhhhhB8CASTM A320Grade B8CAISI 347
hhhhhhhhhhhB8TASTM A320Grade B8TAISI 321
hhhhhhhhhhhB8FASTM A320Grade B8FAISI 303or 303Se
hhhhhhhhhhhB8MASTM A320Grade B8MAISI 316
hhhhhhhhhhhB8ASTM A320Grade B8AISI 3041/4 thru 3/4Over 3/4 thru 1Over 1 thru 1-1/4Over 1-1/4 thru 1-1/2——100,00080,00065,00

50,00

100,00080,00065,00

50,00

hhhhhhhhhhhB8CASTM A320Grade B8CAISI 347
hhhhhhhhhhhB8FASTM A320Grade B8FAISI 303or 303Se
hhhhhhhhhhhB8MASTM A320Grade B8MAISI 316
hhhhhhhhhhhB8TASTM A320Grade B8TAISI 321
hhhhhhhhhhhSAE J429Grade 5Bolts,Screws,StudsMedium Carbon Steel, Quenched and Tempered1/4 thru 1Over 1 to 1-1/285,00074,00092,00081,000120,000105,000
ASTM A4491/4 thru 1Over 1 to 1-1/2Over 1-1/2 thru 385,00074,000

55,000

92,00081,00058,000120,000105,00090,000
hhhhhhhhhhhSAE J429Grade 5.1SemsLow or
Medium Carbon Steel, Quenched and Tempered
No. 6thru 3/885,000120,000
hhhhhhhhhhhSAE J429Grade 5.2Bolts,Screws,StudsLow Carbon
Martensitic Steel, Quenched and Tempered
1/4 thru 185,00092,000120,000
hhhhhhhhhhhA325ASTM A325Type 1High StrengthStructural BoltsMedium
Carbon Steel, Quenched and Tempered
1/2 thru 11-1/8 thru 1-1/285,00074,00092,00081,000120,000105,000
hhhhhhhhhhhA325ASTM A325Type 2Low Carbon
Martensitic Steel, Quenched and Tempered
1/2 thru 185,00092,000120,000
hhhhhhhhhhhA325ASTM A325Type 3Atmospheric
Corrosion Resisting Steel, Quenched and Tempered
1/2 thru 11-1/8 thru 1-1/285,00074,00092,00081,000120,000105,000
hhhhhhhhhhhBBASTM A354Grade BBBolts,StudsAlloy Steel, Quenched and Tempered1/4 thru 2-1/22-3/4 thru 480,00075,00083,00078,000105,000100,000
hhhhhhhhhhhBCASTM A354Grade BC105,00095,000109,00099,000125,000115,000
hhhhhhhhhhhSAE J429Grade 7Bolts,Screws,Medium
Carbon Alloy Steel, Quenched and Tempered
4
1/4 thru
1-1/2
105,000115,000133,000
hhhhhhhhhhhSAE J429Grade 8Bolts,Screws,StudsMedium
Carbon Alloy Steel, Quenched and Tempered
1/4 thru 1-1/2120,000130,000150,000
ASTM A354Grade BDAlloy
Steel, Quenched and Tempered
4
hhhhhhhhhhhNo GradeMarkSAE J429Grade 8.1StudsMedium
Carbon Alloy or SAE 1041 Modified Elevated Temperature
Drawn Steel
1/4 thru
1-1/2
120,000130,000150,000
hhhhhhhhhhhA490ASTM A490High
Strength
Structural Bolts
Alloy
Steel, Quenched and Tempered
1/2 thru
1-1/2
120,000130,000150,000
min
170,000 max
hhhhhhhhhhhNo GradeMarkISO R898Class 4.6Bolts,Screws,StudsMedium Carbon Steel, Quenched and TemperedAll Sizesthru 1-1/233,00036,00060,000
hhhhhhhhhhhNo GradeMarkISO R898Class 5.855,00057,00074,000
8.8hhhhhhhhhhhorhhhhhhhhhhh88ISO R898Class 8.8Alloy Steel, Quenched and Tempered85,00092,000120,000
10.9hhhhhhhhhhhorhhhhhhhhhhh109ISO R898Class 10.9120,000130,000150,000

 

FASTENER IDENTIFICATION MARKING

 

GradeIdentificationMarkingSpecificationMaterialNominal SizeIn.ProofLoadStressksiHardnessRockwellSeeNote
MinMax
hhhhhhhhhhhNo MarkASTM A563
– Grade 0
Carbon
Steel
1/4 thru
1-1/2
69B55C323,4
ASTM A563
– Grade A
Carbon
Steel
1/4 thru
1-1/2
90B68C323,4
ASTM A563 – Grade BCarbon Steel1/4 thru 1120B69C323,4
over 1
thru 1-1/2
105
hhhhhhhhhhhASTM A563
– Grade C
Carbon
Steel
May be Quenchedand Tampered
1/4 thru 4144B78C385
hhhhhhhhhhhASTM A563
– Grade C3
AtmosphericCorrosionResistant SteelMay be Quenchedand Tampered1/4 thru 4144B78C385,9
hhhhhhhhhhhASTM A563
– Grade D
Carbon
Steel
May be Quenchedand Tampered
1/4 thru 4150B84C386
hhhhhhhhhhhASTM A563
– Grade DH
Carbon
Steel
Quenchedand Tampered
1/4 thru 4175C24C386
hhhhhhhhhhhASTM A563
– Grade DH3
AtmosphericCorrosionResistant Steel,Quenchedand Tampered1/4 thru 4175C24C385,9
hhhhhhhhhhhASTM A194
– Grade 1
Carbon
Steel
1/4 thru 4130B707
hhhhhhhhhhhASTM A194
– Grade 2
Medium
Carbon
Steel
1/4 thru 41501593527,8
hhhhhhhhhhhASTM A194
– Grade 2H
Medium
Carbon
Steel, Quenchedand Tempered
1/4 thru 4175C24C387
hhhhhhhhhhhASTM A194
– Grade 2HM
Medium
Carbon
Steel, Quenchedand Tempered
1/4 thru 41501592377,8
hhhhhhhhhhhASTM A194
– Grade 4
Medium
Carbon
Alloy Steel,Quenchedand Tempered
1/4 thru 4175C24C387
hhhhhhhhhhhASTM A194
– Grade 7
Medium
Carbon
Alloy Steel,Quenchedand Tempered
1/4 thru 4175C24C387
hhhhhhhhhhhASTM A194
– Grade 7M
Medium
Carbon
Alloy Steel,Quenchedand Tempered
1/4 thru 41501592377
See Note 1,210

NOTES:

  • In addition to the indicated grade marking, all grades, except A563 grades O, A and B, must be marked for manufacturer identification.
  • The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. When nuts are machined from bar stock the nut must be additionally marked with the letter ‘B’.
  • Nuts are not required to be marked unless specified by the purchaser. When marked, the identification marking shall be the grade letter O, A or B.
  • Properties shown are those of nonplated or noncoated coarse thread hex nuts.Properties shown are those of coarse thread heavy hex nuts.
  • Properties shown are those of coarse thread heavy hex nuts.
  • Properties shown are those of coarse 8-pitch thread heavy hex nuts.
  • Hardnesses are Brinell Hardness Numbers.
  • The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel.
  • Specifications —
  • STM A563 — Carbon and Alloy Steel Nuts.
  • ASTM A194/A194M — Carbon and Alloy Steel Nuts for Bolts
    for High Pressure and High Temperature Service.


COUPLING NUT DIMENSIONS
(dimensions in inches)
Thread
Diameter
‘D’
Width
Across Flats
‘F’
Width
Across Points
‘G’
Overall
Length
‘L’
Weight
Each
(lbs)
1/23/47/81-1/20.12
5/811-1/81-7/80.30
3/41-1/81-5/162-1/40.42
7/81-5/161-7/162-5/80.56
11-1/21-3/430.99
1-1/81-5/81-7/83-3/81.23
1-1/41-7/82-3/163-3/41.93
1-3/822-5/164-1/82.31
1-1/22-1/42-5/84-1/23.33
1-5/82-3/43-3/164-7/86.17
1-3/42-3/43-3/165-1/46.16
1-7/833-7/165-5/87.61
23-1/43-7/1669.69
2-1/43-1/24-1/166-3/412.7
2-1/23-7/84-1/27-1/217.2
2-3/44-1/44-15/168-1/422.7
34-5/85-5/16929.2
3-1/455-3/49-3/436.8
3-1/25-3/86-3/1610-1/245.8
3-3/45-3/46-5/811-1/456.0
46-1/87-1/161268.0
4-1/26-7/87-15/1613-1/296.0
57-5/88-13/1615130.0

 

Nut Type

Hex NutsHeavy Hex NutCap NutAcorn NutSerrated Flange Nut
Coupling NutSquare NutCastle NutWing NutFlange Lock Nut
Flex Lock NutHigh NutKep NutJam NutNylon Lock Nut
Slotted NutReversible Lock NutCustom NutT Nuts 

 

Carbon Steel Coupling Nut Application Industries

Sunflex Metal Industries are engaged in manufacturing of robust quality of Carbon Steel Coupling Nut. These Carbon Steel Coupling Nut are widely used in the following industries:

Carbon Steel Coupling Nut Mining Industries
Carbon Steel Coupling Nut Transport Industries- Rail and Road
Carbon Steel Coupling Nut Construction Industries / Building Systems
Carbon Steel Coupling Nut Manufacturing Industries
Carbon Steel Coupling Nut Agriculture Industries
Carbon Steel Coupling Nut Energy Industries
Carbon Steel Coupling Nut Water Industries
Carbon Steel Coupling Nut Automotive Industries
Carbon Steel Coupling Nut Ship Building Industries
Carbon Steel Coupling Nut Nuclear Power Plant
Carbon Steel Coupling Nut Paper & Pulp Industries
Carbon Steel Coupling Nut Sugar Industries
Carbon Steel Coupling Nut Engineering Cement Industries
Carbon Steel Coupling Nut Petro-Chemical Industries
Carbon Steel Coupling Nut Food Industries
Carbon Steel Coupling Nut Oil & Gas Industries
Carbon Steel Coupling Nut Chemical & Pharmaceutical Industries

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