ASTM A194 NUTS

STOCKIST, MANUFACTURER, SUPPLIER OF ASTM A194 HEX NUTS


ASTM A194 Hex Nuts Specifications


ASTM A194 Hex Nut Specifications

The ASTM A194 Specification covers Carbon, Alloy and Stainless Steel Hex Nuts intended for use in High Pressure and High Temperature Service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class 2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 Grade 2H nuts are common in the marketplace and are often substituted forASTM A563 Grade DHnuts due to the limited availability of DH nuts in certain diameters and finishes.

We Presinox Impex are one of the Largest Manufacturer, Stockist, Suppliers, Exporter, Traders, Dealers, Wholesalers of ASTM A194 Hex Nuts in Mumbai, Maharashtra, India.

A194 Grades Hex Nuts:
ASTM A194 Gr. 2 Carbon steelheavy hex nuts
ASTM A194 Gr. 2H Quenched & tempered carbon steel heavy hex nuts
ASTM A194 Gr. 2HM Quenched & tempered carbon steel heavy hex nuts, 100% hardness tested
ASTM A194 Gr. 4 Quenched & tempered carbon-molybdenum heavy hex nuts (withdrawn in 2017)
ASTM A194 Gr. 7 Quenched & tempered alloy steel heavy hex nuts
ASTM A194 Gr. 7M Quenched & tempered alloy steel heavy hex nuts, 100% hardness tested
ASTM A194 Gr. 7L Quenched & tempered alloy steel heavy hex nuts, Charpy impact tested
ASTM A194 Gr. 8 Stainless AISI 304 heavy hex nuts
ASTM A194 Gr. 8M Stainless AISI 316 heavy hex nuts

A194 Hex Nuts Mechanical Properties :
Grade Identification Marking Specifications Materials Nominal Size, In. Tempering Temp. F Proof Load Stress, ksi Hardness Rockwell
Min Max
ASTM A194 Grade 2 Medium Carbon Steel 1/4 - 4 0 150 159 352
ASTM A194 Grade 2H Medium Carbon Steel, Quenched and Tempered 1/4 - 4 850 175 C24 C38
ASTM A194 Grade 2HM Medium Carbon Steel, Quenched and Tempered 1/4 - 4 1150 150 159 237
ASTM A194 Grade 4 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1100 175 C24 C38
ASTM A194 Grade 7 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1100 175 C24 C38
ASTM A194 Grade 7M Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1150 150 159 237
ASTM A194 Grade 8 Stainless AISI 304 1/4 - 4 - 80 126 300
ASTM A194 Grade 8M Stainless AISI 316 1/4 - 4 - 80 126 300

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 additionally be marked with the letter 'B'.

The letters H and M indicate heat treated nuts.

A194 Hex Nuts Chemical Properties :
Element 2, 2H, and 2HM 4 7 and 7M (AISI 4140) 8 (AISI 304) 8M (AISI 316)
Carbon 0.40% min 0.40 - 0.50% 0.37 - 0.49% 0.08% max 0.08% max
Manganese 1.00% max 0.70 - 0.90% 0.65 - 1.10% 2.00% max 2.00% max
Phosphorus, max 0.0004 0.00035 0.00035 0.00045 0.00045
Sulfur, max 0.0005 0.0004 0.0004 0.0003 0.0003
Silicon 0.40% max 0.15 - 0.35% 0.15 - 0.35% 1.00% max 1.00% max
Chromium 0.75 - 1.20% 18.0 - 20.0% 16.0 - 18.0%
Nickel 8.0 - 11.0% 10.0 - 14.0%
Molybdenum 0.20 - 0.30% 0.15 - 0.25% 2.00 - 3.00%

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