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Nuts – ASTM A194


Biggest Manufacturer of Nuts & Bolts in India – All Nuts are available in 304, 304L, 316, 316L , H.T Gr. 8 , 10 at Lowest Prices! ASTM A194 Gr 2H A563 DIN934 Grade 2, 5, 8 Black Heavy Hex Nuts

  • Key Nut Products: Hex Nuts, Heavy Hex Nuts, Lock Nuts, Nylon Lock Nuts, Jam Nuts, Dome Nuts, Square Nuts
  • Normal Dia : ¼” to 4″ or M6 to M100
  • ASTM A194 – This specification covers carbon, alloy and stainless steel nuts intended for use in high-pressure and/or high- temperature service. Unless otherwise specified, heavy hex nuts (ANSI B 18.2.2) shall be used.

Metline produces premium quality nuts, hex nuts and heavy hex nuts in a wide range of grades and sizes and in accordance with ASTM/ASME/DIN standards and specifications. We produce both hot forged nuts and cold formed nuts in almost all shapes & sizes. The common standard of ASME/ANSI Hex Nut is ASME B18.2.2, which includes normal hex nut, hex thin nut, hex thick nut and heavy hex nut. These nuts manufactured by Metline are intended for high-pressure or high-temperature service, or both.


Metline is a specialized manufacturer and supplier of low carbon steel (mild steel), carbon steel, alloy steel, stainless steel and brass, aluminium alloy nuts. For greater strength and corrosion resistance in nuts, we can also process the materials further such as heating, black oxide, zinc coating, hot dip galvanizing, black zinc coating, brass coating, nickle and chrome plating, dacomate, etc. We can offer fastest delivery for hex nuts and heavy hex nuts manufactured as per DIN 934, DIN 6923, DIN 1587, DIN 928, DIN 929.

ASTM A194 Nut Grades Available for Production & Supply

2H, 2HMCarbon Steel
3Type 501
4Carbon, Molybdenum Steel
6Type 410S41000
7, 7MType 4140, 4142, 4145, 4140H, 4142H, 4145H
8Type 304S30400
8MType 316S31600
8TType 321S32100
16Chromium Molybdenum Vanadium

Stainless Steel Nuts

304 (B8), 316 (B8M), 316 L, 316 Ti ,317 L, 310, 321H (B8T), 347H (B8C), SS 410 (B6) , 904 L (UB6) , A453 GR 660 A/B/C & D.

Duplex & Super Duplex Steel Nuts

UNS S31803 / UNS S32205 (F 51), UNS S32750 (F 53), UNS S32760 (F 55), UNS S31254 (SMO 254).

High Nickel Alloys Nuts

Monel 400 , Monel K 500, Incoloy 600, Incoloy 625, Incoloy 800H, Incoloy 825, Incoloy 718 , Inconel X – 750, Alloy 20 (CB 20) , Hastelloy C 276 , Hastelloy C 22, Hastelloy C4.

Other Alloys Nuts

Titanium Gr 2, Titanium Gr 5, Aluminium Bronze (AB 2) , Phosphorous Bronze (PB).

Material Hardness Specification as per ASTM A194

Grade & TypeBrinell HardnessRockwell Hardness
C ScaleB Scale
2H to 1-1⁄2 in. or M36, incl.248-32724-35
2H over 1-1⁄2 in. or M36212-32735 max95 min
2HM and 7M159-23584 – 99
3, 4, 7, 16248-32724 – 35
8, 8C, 8M, 8T, 8F, 8MLCuN126-30032 max60 min

Chemical Composition of Various Materials, as per ASTM A194 Specification

GradeCarbonManganesePhosphorous, maxSulfur, maxSiliconChromiumNickelMolybdenumOther Elements
2, 2H and 2 HM0.40% min.1.00% max.0.04%0.05%0.40% max
30.10% min.1.00% max.0.04%0.03%1.00%4.0-6.0%0.20-0.30%
40.40 -0.50%0.70-0.90%0.04%0.04%0.15-0.35%0.20-0.30%
6F0.15%1.25%0.06%0.06%1.00%12.0-14.0%Selenium-0.15% min
7 and 7M (AISI 4140)0.37-0.49%0.65-1.10%0.04%0.04%0.15-0.035%0.75-1.20%0.15-0.25%
8 (AISI 304)0.08%2.00% max0.05%0.03%1.00% max18.0-20.0%8.0-11.0%
8M (AISI 316)0.08%2.00% max0.05%0.30%1.00% max16.0-18.0%10.0-14.0%2.00-3.00%
8C0.08%2.00%0.05%0.03%1.00%17.0-19.0%9.0-12.0%Columbium and Tantalum – 10x carbon content, min
8T0.80%2.00%0.05%0.30%1.00%17.0-19.0%9.0-12.0%Titanium-0.70%max, Nitrogen-0.10%
8R0.06%4.0-6.0%0.05%0.03%1.00%20.5-23.5%11.5-13.5%1.50-3.00%Columbium and Tantalum-0.10-0.30%, Nirogen-0.20-0.40%, Vanadium-0.10-0.30%
160.36-0.47%0.45-0.70%0.04%0.40%0.15-0.35%0.80-1.15%0.50-0.65%Vanadium-0.25-0.35%, Aluminum-0.015%


Additional information


Normal Dia : ¼" to 4" 6-100 mm
Length : As Specified by user or Upto any Length

Surface Finish

Blackening, Cadmium Zinc plated, Galvanized, Hot Dip Galvanized, Nickel Plated, Buffing, P.T.F.E. Coated


Metric, BSW, BSF, UNC, UNF, and as per costumers requirement


A nut is a type of fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads' friction, a slight stretch of the bolt, and compression of the parts.


DIN 6915 CI. 10, Stainless Steel AISI 304 / 316. Heavy hex nuts ASTM A194 Gr.8, 8M
ASTM A 194 Gr. 2H, 2HM, G4, G7, G7M, A563/A563M Gr. A, B, DH / 8S/ 10S.
DIN934 / BS3692 CI.6, 8, 10, 12. BS4395 Part 1 & 2

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