Monel 400 Stud Bolts

Monel 400 stud bolts are made of a nickel-copper alloy known as UNS N04400 with a minimum of 63% nickel and 28 to 34% copper. The alloy is reliable in corrosion resistance in seawater, hydrofluoric acid, sulphuric acid, and alkaline environments. It has good mechanical properties at sub-zero temperatures and can be used for cryogenic bolting. These stud bolts are used in marine engineering, chemical processing, oil and gas alkylation units, power generation, and pharmaceutical applications where chloride attack, acid exposure, or low-temperature service rules out standard stainless grades.

Approx Price Range

The approximate price range of Monel 400 stud bolts per kg and the factors affecting their price are explained below.

Price Per kg

Monel 400 stud bolts cost approximately ₹1,000-₹1,500 per kg. Small or individual orders are priced per piece. Request both options from your supplier before you order.

Factors Affecting Price

Nickel and copper spot rates, order volume, stud length, thread form, certification requirements, surface finish, and delivery lead time all influence the final price of DIN 2.4360 stud bolts.

Types of DIN 2.4360 Stud Bolts

Monel 400 stud bolts are available in several configurations. Each type is suited to a specific joint design, assembly condition, or installation method.

Fully Threaded Stud Bolts

Double-End Stud Bolts

Tap-End Stud Bolts

Continuous Thread Stud

Collar Stud Bolts

Alloy 400 Stud Bolts Specifications

The table below covers key specification parameters for Monel 400 stud bolts as per international standards.

Parameter	Details
Standard	ASTM B164 / ASME SB164
Fastener Standard	ASTM F468 / ASME SF468
Nut Standard	ASTM F467 / ASME SF467
Diameter Range	1/4" – 4" / M6 – M100
Length Range	25 mm – 3000 mm / 1" – 120"
End Type	Chamfered (pointed)
Manufacture	Cold forging, Hot forging, CNC machining
Finish	Plain, Passivated, Black oxide, PTFE

Chemical Properties of Monel 400 Stud Bolts

The composition below shows the high nickel and copper content that gives UNS N04400 its broad corrosion resistance in seawater, acids, and alkalis.

Element	Composition (%)
Nickel (Ni)	63.0 min
Copper (Cu)	28.0 – 34.0
Iron (Fe)	2.5 max
Manganese (Mn)	2.0 max
Carbon (C)	0.3 max
Silicon (Si)	0.5 max
Sulphur (S)	0.024 max

Mechanical Properties of ASTM F468 UNS N04400 Stud Bolts

The mechanical values below apply to Monel 400 bar stock used to produce stud bolts, as per ASTM B164 and ASTM F468.

Property	Value
Tensile Strength	550 MPa (80,000 psi) min
Yield Strength (0.2% offset)	240 MPa (35,000 psi) min
Elongation	35% min
Hardness	Max 100 HRB

Physical Properties of Nickel Alloy 400 Stud Bolts

The physical properties below help engineers assess thermal behaviour and confirm suitability for high-temperature or cryogenic service conditions.

Property	Value
Density	8.80 g/cm³
Melting Range	1300 – 1350°C (2370 – 2460°F)
Specific Heat	427 J/kg·°C
Thermal Conductivity	21.8 W/m·K (at 100°C)
Electrical Resistivity	0.547 µΩ·m
Modulus of Elasticity	179 GPa
Coefficient of Thermal Expansion	13.9 µm/m°C (20–100°C)

Dimension Chart of Monel 400 Stud Bolts per ASME B16.5 Class 150

The table below lists standard stud bolt dimensions for UNS N04400 per ASME B16.5 Class 150, for raised face (RF) and ring type joint (RTJ) flanges.

NPS (in)	Bolt Dia (in)	RF Length (mm)	RTJ Length (mm)	No. of Bolts
1/2	1/2	55	—	4
3/4	1/2	65	—	4
1	1/2	65	75	4
1.1/4	1/2	70	85	4
1.1/2	1/2	70	85	4
2	5/8	85	95	4
2.1/2	5/8	90	100	4
3	5/8	90	100	4
3.1/2	5/8	90	100	8
4	5/8	90	100	8
5	3/4	95	110	8
6	3/4	100	115	8
8	3/4	110	120	8
10	7/8	115	125	12
12	7/8	120	135	12
14	1	135	145	12
16	1	135	145	16
18	1.1/8	145	160	16
20	1.1/8	160	170	20
24	1.1/4	170	185	20

Size Chart of DIN 2.4360 Stud Bolts

The size chart below covers standard stud bolt diameters and thread pitches for both metric and unified thread forms.

Bolt Dia (in)	Bolt Dia (mm)	Thread Series	Threads per Inch (TPI)	Metric Pitch (mm)
1/4"	M6	UNC / Metric Coarse	20	1.0
5/16"	M8	UNC / Metric Coarse	18	1.25
3/8"	M10	UNC / Metric Coarse	16	1.5
7/16"	M12	UNC / Metric Coarse	14	1.75
1/2"	M14	UNC / Metric Coarse	13	2.0
5/8"	M16	UNC / Metric Coarse	11	2.0
3/4"	M20	UNC / Metric Coarse	10	2.5
7/8"	M22	UNC / Metric Coarse	9	2.5
1"	M24	UNC / Metric Coarse	8	3.0
1.1/8"	M27	UNC / Metric Coarse	7	3.0
1.1/4"	M30	UNC / Metric Coarse	7	3.5
1.3/8"	M36	UNC / Metric Coarse	6	4.0
1.1/2"	M42	UNC / Metric Coarse	6	4.5
2"	M48	UNC / Metric Coarse	4.5	5.0

Torque Chart of Monel 400 Stud Bolts

The torque values below apply to Monel 400 stud bolts with hex nuts under controlled assembly conditions. Always verify torque requirements with your engineering team based on joint design, gasket specification, and flange class.

Bolt Dia	Lubricated Torque (Nm)	Dry Torque (Nm)
1/2" (M14)	28 – 32	38 – 43
5/8" (M16)	57 – 64	77 – 86
3/4" (M20)	100 – 112	135 – 151
7/8" (M22)	160 – 178	216 – 240
1" (M24)	242 – 268	327 – 362
1.1/8" (M27)	348 – 386	470 – 521
1.1/4" (M30)	486 – 540	656 – 729
1.3/8" (M36)	654 – 726	883 – 980

Key Features of Monel 400 Stud Bolts

Monel 400 stud bolts provide a dependable combination of corrosion resistance and mechanical properties over a wide range of service conditions.

Seawater corrosion resistance

Resistance to hydrofluoric acid

Good resistance to sulphuric and hydrochloric acids

High toughness at sub-zero temperatures

Chloride stress corrosion cracking resistance

Tensile strength is higher than that of annealed 304 and 316 Stainless Steel

Good weldability

Wide size and length range

Applications of ASTM B164 Monel 400 Stud Bolts

Alloy 400 stud bolts are a reliable choice in many demanding industries, as they are resistant to seawater, can tolerate acid, and are tough at cryogenic temperatures.

Marine Engineering
Oil Refining (Alkylation Units)

Chemical Processing

Power Generation

Cryogenic and LNG Service

Pharmaceutical Manufacturing

Pulp and Paper

How to Choose the Right Monel 400 Stud Bolt Supplier?

Ensure the following things when choosing the right Monel 400 stud bolt supplier.

Supplier Selection Criteria

First, check the stock availability in the diameters and lengths required. Suppliers keep Alloy 400 stud bolts in double-end and full thread styles in stock and ready to ship. Suppliers also stock ASME B16.5 sets for the standard flange sizes. Please confirm experience with nickel alloy supply, as general fastener distributors may not carry Monel grades or have the certifications required for critical service.

Technical Considerations

Request material test certificates showing chemical and mechanical properties as per ASTM B164 and ASTM F468. For flanged joints, verify the stud bolt lengths and number of threads using the ASME B16.5 bolting tables for your flange class and pressure rating. Check that NACE MR0175 compliance documentation is provided for the alkylation unit or sour gas service. Ask for PMI results on the finished studs to confirm that the grade supplied is N04400 and not a lower-nickel alternative.

Quality and Certification Check

EN 10204 / 3.1 mill test certificates with heat number traceability back to the mill are the minimum requirement. For offshore or marine projects, third-party inspection reports and PMI records are standard. ISO 9001 certification is a baseline. For nuclear or defence projects, also check for additional quality plan documentation and any project-specific traceability requirements before confirming the order.

Procurement Tips for Bulk Orders

Monel 400 prices track LME nickel and copper. Lock in rates at order placement on long projects to protect against metal price movement. Blanket purchase orders are effective for a continuing or repeat procurement that reduces the cost per unit over time. Always ask for samples and test certificates before accepting a full production run. Confirm timelines for written submission. For urgent requirements, verify whether the supplier holds finished stud bolt stock or needs to start from bar supply.