Hastelloy C276 Fasteners

Hastelloy C276 Fasteners are composed of a nickel-molybdenum-chromium alloy (UNS N10276) with roughly 15% molybdenum and 15% chromium. Low carbon content (max 0.010%) prevents carbide precipitation during welding, and the weld joints retain their corrosion resistance. C276 is one of the most widely used nickel alloys for severe chemical service. It handles strongly reducing and moderately oxidising acids, wet chlorine, and hydrogen sulphide. These fasteners are used across chemical processing, oil and gas, flue gas desulphurisation, pharmaceutical, and pulp and paper industries.

Approx Price Range

The approx price range of Hastelloy C276 fasteners per kg and factors affecting their prices are explained below.

Price Per kg

Hastelloy C276 fasteners are priced at approximately ₹1,000 to ₹1,750/kg. For small orders, per-piece pricing is common. Ask your supplier for both options.

Factors Affecting Price

Nickel and molybdenum market rates, order volume, fastener type, certification requirements, surface finish, and delivery lead time all influence the final price of UNS N10276 fasteners.

Types of ASTM B574 UNS N10276 Fasteners

Hastelloy C276 fasteners are available in a full range of types. Each type is suited to a specific joint design, load requirement, or installation condition.

Bolts
Nuts

Studs

Screws

Washers

Alloy C276 Fasteners Specifications

The table below covers key specification parameters for Hastelloy C276 fasteners as per international standards.

Parameter	Details
Standard	ASTM B574 / ASME SB574
Bolt / Screw Size Range	M3 – M56 / 3/16" – 2" (CNC machined up to M100 / 4")
Nut Size Range	M3 – M56 / 3/16" – 2" / custom
Washer Size Range	M3 – M56 / #4 – 3"
Machine Screw Size Range	M1.6 – M12
Length Range	3 mm – 200 mm (up to 1500 mm for CNC machined)
Manufacturing Process	Cold forging (M2–M24), Hot forging (M24–M100), CNC machining
Finish	Plain, Zinc, Black oxide, Nickel plated, PTFE, Geomet, Dacromet

Chemical Properties of Hastelloy C276 Fasteners

The chemical composition below reflects the high molybdenum and chromium content that gives UNS N10276 its broad corrosion resistance across both oxidising and reducing environments.

Element	Composition (%)
Nickel (Ni)	Balance
Molybdenum (Mo)	15.0 – 17.0
Chromium (Cr)	14.5 – 16.5
Iron (Fe)	4.0 – 7.0
Tungsten (W)	3.0 – 4.5
Cobalt (Co)	Max 2.5
Manganese (Mn)	Max 1.0
Carbon (C)	Max 0.010
Silicon (Si)	Max 0.08
Phosphorus (P)	Max 0.04
Sulfur (S)	Max 0.03
Vanadium (V)	Max 0.35

Mechanical Properties of DIN 2.4819 Fasteners

The mechanical values below apply to ASTM B574 UNS N10276 bar stock used to manufacture C276 fasteners.

Property	Value
Tensile Strength	790 MPa (115,000 psi) min
Yield Strength (0.2% offset)	355 MPa (52,000 psi) min
Elongation	40% min
Hardness	Max 100 HRB

Physical Properties of Alloy C276 Fasteners

The physical properties below help engineers assess thermal performance and material behaviour under service conditions.

Property	Value
Density	8.89 g/cm³
Melting Range	1325 – 1370°C (2415 – 2500°F)
Specific Heat	427 J/kg·°C
Thermal Conductivity	10.2 W/m·K (at 100°C)
Electrical Resistivity	1.30 µΩ·m
Modulus of Elasticity	205 GPa

Dimension Chart of UNS N10276 Fasteners

The dimension chart below lists standard size ranges for the most commonly supplied Hastelloy C276 fastener types, as per DIN and ASME standards.

Fastener Type	Size Range (Metric)	Size Range (Inch)	Length Range
Hex Bolt	M3 – M56	3/16" – 2"	3 mm – 200 mm
Heavy Hex Bolt	M10 – M100	3/8" – 4"	25 mm – 1100 mm
Stud Bolt (ASME B16.5)	M10 – M100	3/8" – 4"	As per the flange class
Fully Threaded Stud	M3 – M56	3/16" – 2"	3 mm – 1500 mm
Hex Nut	M3 – M56	3/16" – 2"	Standard / Heavy
Coupling Nut	M6 – M36	1/4" – 1-1/2"	As required
Socket Head Cap Screw	M1.6 – M36	—	5 mm – 200 mm
Machine Screw	M1.6 – M12	—	3 mm – 100 mm
Flat Washer	M3 – M56	#4 – 3"	—

Size Chart of Hastelloy C276 Fasteners

The size chart below lists standard fastener dimensions for Alloy C276 per ASME B18.2.1 and DIN 931/933.

Bolt Size	Across Flats (mm)	Head Height (mm)	Thread Length (mm)	Pitch – Coarse (mm)
M5	8	3.5	16	0.8
M6	10	4.0	18	1.0
M8	13	5.5	22	1.25
M10	17	6.4	26	1.5
M12	19	7.5	30	1.75
M14	22	8.8	34	2.0
M16	24	10.0	38	2.0
M20	30	12.5	46	2.5
M22	32	14.0	50	2.5
M24	36	15.0	54	3.0
M27	41	17.0	60	3.0
M30	46	18.7	66	3.5
M36	55	22.5	78	4.0
M42	65	26.0	90	4.5
M48	75	30.0	102	5.0
M56	85	35.0	118	5.5

Custom sizes available up to M100 / 4" via CNC machining.

Torque Chart of ASTM B574 C276 Fasteners

The torque values below apply to Hastelloy C276 fasteners under controlled assembly conditions. Always confirm values with your engineering team based on joint design and bolt grade.

Bolt Size	Lubricated Torque (Nm)	Dry Torque (Nm)
M8	18 – 20	24 – 27
M10	35 – 40	46 – 52
M12	60 – 68	82 – 90
M16	145 – 160	195 – 215
M20	280 – 310	375 – 410
M24	480 – 520	645 – 695
M30	950 – 1020	1280 – 1370
M36	1650 – 1780	2220 – 2380

Key Features of Hastelloy C276 Fasteners

Hastelloy C276 fasteners are built for severe chemical service. These properties make them a reliable choice for demanding industrial applications.

Exceptional corrosion resistance

Resistance to wet chlorine and chlorine dioxide

Low carbon content

High molybdenum content

Stress corrosion cracking resistance

High temperature performance

Good weldability

Wide size range

Applications of UNS N10276 Fasteners

Alloy C276 is a good choice in industries with harsh chemical environments due to its extensive corrosion resistance.

Chemical Processing
Oil and Gas

Flue Gas Desulphurisation

Pharmaceutical Manufacturing

Pulp and Paper

Marine and Offshore

Power Generation

How to Choose the Right Hastelloy C276 Fasteners Supplier?

Please consider the following things before choosing the right Hastelloy C276 fastener supplier.

Supplier Selection Criteria

Stock range is the first thing to check. A reliable supplier will stock Alloy C276 in different types and sizes. Stud bolts, hex bolts, nuts, and washers should be readily available with no long lead time. Check their handling of special thread forms and custom sizes as well. A supplier experienced in exporting nickel alloys regularly is a safer option than a general fastener distributor.

Technical Considerations

Request Material Test Certificates (MTCs) certifying chemical and mechanical properties per ASTM B574 or ASME SB574. Verify stud bolt size for flange connections per ASME B16.5. If the service is sour gas or contains H2S, request documentation of NACE MR0175 compliance. For high-pressure bolting, check elongation & hardness data vs tensile strength.

Quality and Certification Check

Baseline requirement is full heat number traceability with EN 10204 / 3.1 MTC’s. When corrosion performance is critical, check for third-party inspection reports, PMI test results, and IGC test records. Baseline requirement is ISO 9001 certification. Confirm PED compliance and any specific project documentation requirements before placing the order for nuclear or oil and gas projects.

Procurement Tips for Bulk Orders

C276 price is tied closely with LME nickel. Locking in rates at order placement protects against price movement for bigger or longer-term projects. A good solution for repeat procurement is blanket purchase orders. Always get samples before full batch approval. Instead of estimated lead times, confirm written delivery commitments. If you have critical path requirements, ask if the supplier has finished fastener stock on hand instead of waiting for mill lead times.