MATERIALS

Nuts and studbolts may be manufactured with several different types of metal alloys and steels.

The most common requests are for specific carbon, stainless and low-alloy steels, as well as special martensitic steel.

ASTM criteria for the specifications to be respected in the fitting manufacture establish precise performances and mechanical characteristics, as needed to guarantee efficiency and constant results. Since there is an enormous number of different material types in this efield, here is a short list of the most commonly used ones in the manufacture of studbolts, nuts, screws, bolts and threaded rods:

ASTM A193

Alloy and stainless steels for high-temperature and pressure specific studbolts

ASTM A193

Alloy and stainless steels for high-temperature and pressure specific studbolts

ASTM A193 B5
ASTM A193 B6
ASTM A193 B7 – Alloy steel, AISI 4140/4142 quenched and tempered
ASTM A193 B7M
ASTM A193 B16
ASTM A193 B8 – Class 1 steel, AISI 304, solubilized.
ASTM A193 B8A
ASTM A193 B8M – Class 1 steel, AISI 316, solubilized
ASTM A193 B8MA
ASTM A193 B8cl2 – Class 2 steel, AISI 304, solubilized, strain hardened
ASTM A193 B8Tcl2
ASTM A193 B8Mcl2 – Class 2 steel, AISI 316, solubilized, strain hardened

ASTM A194

Nuts in carbon, alloy, martensitic, austenitic and stainless steel

ASTM A194 2H – Quenched and tempered steel for hexagonal head nuts
ASTM A194 2HM – Quenched and tempered steel for hexagonal head nuts

ASTM A194 4 – Quenched and tempered carbon molybdenum for hexagonal head nuts
ASTM A194 3
ASTM A194 6
ASTM A194 7 – Quenched and tempered steel for hexagonal head nuts
ASTM A194 7M – Quenched and tempered alloy steel for hexagonal head nuts

ASTM A194 8 – AISI 304 steel for hexagonal head nuts
ASTM A194 8A
ASTM A194 8M – AISI 316 steel for hexagonal head nuts
ASTM A194 8MA
ASTM A194 8C
ASTM A194 8T

ASTM A320

Carbon and stainless steel for low temperatures

ASTM A320 L7 – Alloy steel, AISI 4140/4142 quenched and tempered
ASTM A320 L7M
ASTM A320 L43 – Alloy steel, AISI 4340 quenched and tempered
ASTM A320 B8 – Class 1 stainless steel, AISI 304, solubilized
ASTM A320 B8A
ASTM A320 B8T
ASTM A320 B8TA
ASTM A320 B8C
ASTM A320 B8M – Class 1 stainless steel, AISI 316, solubilized
ASTM A320 B8MA
ASTM A320 B8cl2 – stainless steel, AISI 304, solubilized , strain hardened
ASTM A320 B8Mcl2 – stainless steel, AISI 316, solubilized , strain hardened

ASTM A182

Duplex and Superduplex *

ASTM A182 F51
ASTM A182 F44
ASTM A182 F53
ASTM A182 F55

ASTM B348

Titanium alloys

ASTM F468

Monel

UNS N04400 MONEL K-400 – Nickel-Copper alloy
UNS N05500 MONEL K-500 – Nickel-Copper alloy with percentages of aluminium and titanium

ASTM B637

Inconel – Hastelloy

UNS N06625 INCONEL 625 – Nickel-Chrome alloy
UNS N07718 INCONEL 718 – Nickel-Chrome alloy

UNS N10276 INCONEL C-276 – Nickel-Molybdenum- Chrome alloy

ASTM A453

ASTM A453 660A
ASTM A453 660B
ASTM A453 660C
ASTM A453 660D

ASTM F467

Non-ferrous alloys

Nuts and studbolts may be manufactured with several different types of metal alloys and steels.

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