• ASME SA 194 / Astm A194 Grade 2H/B7/B8/B8m - GR 7/8/8F Nut / Hex Nut / Heavy Hex Nut Manufacturer & Suppliers India
  • ASTM A194 GR.8 Nut Manufacturers

    ASME SA 194 / Astm A194 Grade 2H/B7/B8/B8m - GR 7/8/8F Nut / Hex Nut / Heavy Hex Nut Manufacturer & Suppliers India

    Astm A194 Grade 2H Hex Nut / A194 B7 /A194 B8 Heavy Hex Nut/ A194 B8m Heavy Hex Nut- A194 GR 7/A194 Gr. 8/ A194 Gr. 8F Nut Material Equivalent / Chemical Composition / Mechanical Properties / Specification, Torque & Mechanical Properties, Marking Bolts & Yield Strength / Nut Dimensions & Washer Dimensions

    ASTM A194 Nut

     ASTM A194 GR.8 Hex Nuts
     ASTM A194 GR.8 Lock Nuts
     ASTM A194 GR.8 Heavy Hex Nut
    ASTM A194 GR.8 Hex Nuts
    ASTM A194 GR.8 Lock Nuts
    ASTM A194 GR.8 Heavy Hex Nut

    Table of Content

    A194 Gr8 Hex Nut Manufacturers
    Sa 194 Heavy Hex Nut Specification
    ASTM A194 Hex Nut Mechanical Properties
    ASTM A194 Lock Nut Chemical Composition
    A194 Grades
    A194 Mechanical Properties
    A194 Chemical Properties
    A194 Nut Dimensions
    Table 1: Chemical Requirements
    Table 2: Hardness Requirements
    Table 3: Proof Load Using Threaded Mandrel
    Table 8: Proof Load Testing of Strain Hardened Nuts Using Threaded Mandrel
    Table 10: Proof Load for Large Heavy Hex Nuts
    Types of ASTM A194 Bolts & Nuts
    ASTM A194 Bolts & Nuts Price List

     

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    ASTM A194 GR.8 Fasteners Specification

    Material
    Specification
    Standards
    Size
    Length

    ASTM A194 GR.8 Fasteners

     

    IS

    BS

    ASTM

    DIN, ISO, JIS, GB, IS, BS, ASTM

    M 02 to M 160

    3 mm to 200 mm


    ASTM A194 GR.8 Nut Mechanical Properties

    Tensile Strength/Ultimate Tensile Stress (UTS) – (Mpa) 550
    Yield Strength/Proof Stress(0.2% Offset) (YS) – (Mpa)240
    Elongation in 4D (El)30
    Reduction 40
    Hardness – (BHN)223

    ASTM A194 GR.8 Hex Nut Chemical Composition

    ElementASTM A194 GR.8
    Carbon0.08 max
    Manganese2.00 Max
    Phosphorus, max0.05%
    Sulfur, max0.03%
    Silicon1.00% max
    Chromium16.0-18.0%
    Nickel10.0-14.0%
    Molybdenum2.00-3.00%

    The ASTM A194 specification covers carbon, alloy and stainless steel nuts intended for use in high-pressure and/or 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 for ASTM A563 grade DH nuts due to the limited availability of DH nuts in certain diameters and finishes.

    A194 Grades

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

    A194 Mechanical Properties

    Specification Material Nominal Size, In. Tempering Temp. °F Proof Load Stress, ksi Hardness Rockwell See Note
    Min Max
    ASTM A194 Grade 2 Medium Carbon Steel 1/4 - 4 0 150 159 352 1,2,3
    ASTM A194 Grade 2H Medium Carbon Steel, Quenched and Tempered 1/4 - 4 850 175 C24 C38 1,2
    ASTM A194 Grade 2HM Medium Carbon Steel, Quenched and Tempered 1/4 - 4 1150 150 159 237 1,2,3
    ASTM A194 Grade 4 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1100 175 C24 C38 1,2
    ASTM A194 Grade 7 Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1100 175 C24 C38 1,2
    ASTM A194 Grade 7M Medium Carbon Alloy Steel, Quenched and Tempered 1/4 - 4 1150 150 159 237 1,2,3
    ASTM A194 Grade 8 Stainless AISI 304 1/4 - 4 - 80 126 300 4
    ASTM A194 Grade 8M Stainless AISI 316 1/4 - 4 - 80 126 300 4
    NOTES: 
    1. 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.
    2. Properties shown are those of coarse and 8-pitch thread heavy hex nuts.
    3. Hardness numbers are Brinell Hardness.
    4. Nuts that are carbide-solution treated require additional letter A - 8A or 8MA.
    5. All nuts shall bear the manufacturer’s identification mark. Nuts shall be legibly marked on one face to indicate the grade and process of the manufacturer. Marking of wrench flats or bearing surfaces is not permitted unless agreed upon between manufacturer and purchaser.
    6. Other less common grades exist, but are not listed here.

    A194 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 0.040% 0.035% 0.035% 0.045% 0.045%
    Sulfur, max 0.050% 0.040% 0.040% 0.030% 0.030%
    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%

    A194 Nut Dimensions

    Bolt Diam. F C H Weight
    (lbs.)
    Part Numbers
    Width Across Flats Width Across Corners Thickness A563A A1942H A563DH
    Import Domestic Import Domestic
    Basic Max Min Max Min Basic Max Min Plain Galv. Plain Galv. Plain Galv. Plain Galv.
    1⁄2 7⁄8 0.875 0.850 1.010 0.969 31⁄64 0.504 0.464 0.07 11729 11730 16356 - 11761 11762 - 18345
    5⁄8 11⁄16 1.062 1.031 1.227 1.175 39⁄64 0.631 0.587 0.12 11731 11732 16358 16359 11763 11764 - 18346
    3⁄4 11⁄4 1.250 1.212 1.443 1.382 47⁄64 0.758 0.710 0.20 11733 11734 16360 16361 11765 11766 - 18347
    7⁄8 17⁄16 1.438 1.394 1.660 1.589 55⁄64 0.885 0.833 0.30 11735 11736 16362 16363 11767 11768 - 18348
    1 15⁄8 1.625 1.575 1.876 1.796 63⁄64 1.012 0.956 0.43 11737 11738 16364 16365 11769 11770 - 18349
    11⁄8 113⁄16 1.812 1.756 2.093 2.002 17⁄64 1.139 1.079 0.59 11739 11740 16366 - 11771 11772 - 16367
    11⁄4 2 2.000 1.938 2.309 2.209 17⁄32 1.251 1.187 0.79 11741 11742 16370 - 11773 11774 - 16371
    13⁄8 23⁄16 2.188 2.119 2.526 2.416 111⁄32 1.378 1.310 1.02 11743 11744 16374 - 11775 11776 - 16375
    11⁄2 23⁄8 2.375 2.300 2.742 2.622 115⁄32 1.505 1.433 1.31 11745 11746 16378 - 11777 11778 - 16379
    15⁄8 29⁄16 2.562 2.481 2.959 2.828 119⁄32 1.632 1.556 1.62 17750 17751 16380 16381 11779 11780 16380 16381
    13⁄4 23⁄4 2.750 2.662 3.175 3.035 123⁄32 1.759 1.679 2.04 11747 11748 16384 16385 12549 12550 16384 16385
    17⁄8 215⁄16 2.938 2.844 3.392 3.242 127⁄32 1.886 1.802 2.41 19433 19434 - - - - - -
    2 31⁄8 3.125 3.025 3.608 3.449 131⁄32 2.013 1.925 2.99 11749 11750 16390 16391 11783 11784 16390 16391
    21⁄4 31⁄2 3.500 3.388 4.041 3.862 213⁄64 2.251 2.155 4.19 11751 11752 16396 16397 12681 12682 16396 16397
    21⁄2 37⁄8 3.875 3.750 4.474 4.275 229⁄64 2.505 2.401 5.64 11753 11754 16398 16399 12553 12554 16398 16399
    23⁄4 41⁄4 4.250 4.112 4.907 4.688 245⁄64 2.759 2.647 7.38 15864  16041 16400 16401 12555 12556 16400 16401
    3 45⁄8 4.625 4.475 5.340 5.102 261⁄64 3.013 2.893 9.50 15863 16042 16402 16403 12601 12602 16402 16403
    31⁄4 5 5.000 4.838 5.774 5.515 33⁄16 3.252 3.124 11.94 18395 - - - - - - -
    31⁄2 53⁄8 5.375 5.200 6.207 5.928 37⁄16 3.506 3.370 15.26 18495 - - - - - - -
    33⁄4 53⁄4 5.750 5.562 6.640 6.341 311⁄16 3.760 3.616 18.12 - - - - - - - -
    4 61⁄8 6.125 5.925 7.073 6.755 315⁄16 4.014 3.862 21.80 11755 11756 16404 16405 - - 16404 16405

    Dimensions per ASME B18.2.2 1987 (1999)

    This specification2 covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1⁄4" through 4" nominal. It also covers austenitic stainless steel nuts in the size range 1⁄4" nominal and above. These nuts are intended for high-pressure or high-temperature service, or both. Other grades of A194 nuts exist but are not listed on this page.

    Ferritic Grades – 2H & 6
    Austenitic Grades – 8 & 8M

    Table 1: Chemical Requirements

    Grade 2H 6 8 8M
    Material Carbon Type 410 Type 304 Type 316
    UNS # - S4100 S30400 S31600
    Carbon % 0.40 min 0.15 0.08 0.08
    Magnanese % 1.00 1.00 2.00 2.00
    Phosphorus % 0.040 0.040 0.045 0.045
    Sulfur ᴱ 0.050 0.030 0.030 0.030
    Silicon % 0.40 1.00 1.00 1.00
    Chromium % - 11.5-13.5 18.0-20.0 16.0-18.0
    Nickel % - - 8.0-11.0 10.0-14.0
    Molybedenum % - - - 2.00-3.00
    Titanium % - - - -
    Columbium & Tantaium - - - -
    Nitrogen % - - - -
    Other % - - - -
    Source: ASTM A194-11

    A – The intentional addition of Bi, Se, Te, and Pb is not permitted except for Grades 6F, 8F, and 8FA, in which Se is specified and required.
    B – Total aluminum, soluble and insoluble.
    C – Maximum, unless minimum or range is indicated.
    E – Because of the degree to which sulfur segregates, product analysis for sulfur over 0.060 % max is not technologically appropriate.
    If no value present then there is no requirement

    Table 2: Hardness Requirements

    Grade & Type Completed Nuts Sample Nut After Treatment as in 8.1.5
    Brinell Hardness Rockwell C Rockwell B Brinell Harness min Rockwell Hardness B min
    2H up to 1-1/2" Inclusive 248 to 327 24 to 35 - 179 89
    2H over 1-1/2 212 to 327 35 max 95 min 147 79
    6 228 to 271 20 to 28 - - -
    8 & 8M 126 to 300 32 max 60 min - -
    Source: ASTM A194-11
    If no value present then there is no requirement

    Table 3: Proof Load Using Threaded Mandrel

    Nominal Threads Stress Area Proof Load lbf ᴬ For Grade 2H
    Proof Load lbf ᴬ For Grade 6
    Proof Load lbf ᴬ For All Grade 8s
    Size ᴰ Per Inch In ² Heavy Hex ᶠ Hex ᴳ Heavy Hex ᴰ Hex ᴱ Heavy Hex ᴴ Hex ᴵ
    1/4 20 0.0316 5570 4770 4770 4300 2540 2380
    5/16 18 0.0524 9170 7860 7860 7070 4190 3930
    3/8 16 0.0774 13560 11620 11620 10460 6200 5810
    7/16 14 0.1063 18600 15940 15940 14350 85000 7970
    1/2 13 0.1419 24830 21280 21280 19160 11350 10640
    9/16 12 0.182 31850 27300 27300 24570 14560 13650
    5/8 11 0.226 39550 33900 33900 30510 18080 16950
    3/4 10 0.334 58450 50100 50100 45090 26720 25050
    7/8 9 0.462 80850 69300 69300 62370 36960 34650
    1 8 0.606 106000 90900 90900 81810 48480 45450
    1-1/8 8 0.79 138200 118500 118500 106700 63200 59250
    1-1/4 8 1 175000 150000 150000 135000 80000 75000
    1-3/8 8 1.233 215800 185000 185000 166500 98640 92450
    1-1/2 8 1.492 261100 223800 223800 201400 119360 111900
    Source: ASTM A194-11

    NOTE 1 – Proof Loads ARE NOT design loads
    A – See limit for proof load test in 8.2.2.1. The proof load for jam nuts shall be 46 % of the tabulated load.
    B – Based on proof stress of 130 000 psi.
    C – Based on proof stress of 120 000 psi.
    D – Based on proof stress of 150 000 psi.
    E – Based on proof stress of 135 000 psi.
    F – Based on proof stress of 175 000 psi.
    G – Based on proof stress of 150 000 psi.
    H – Based on proof stress of 80 000 psi.
    I – Based on proof stress of 75 000 psi.

    Table 8: Proof Load Testing of Strain Hardened Nuts Using Threaded Mandrel

    Nominal Size Threads
    per Inch
    Stress
    Area In ²
    Grade 8M Strain
    Hardened Heavy Hex ᴮ
    Grade 8M Strain
    Hardened Hex ᶜ
    All Other Grade 8 Strain
    Hardened Heavy Hex ᴰ
    All Other Grade 8
    Strain Hardened Hex ᴮ
    1/4 20 0.0316 3480 3160 3950 3480
    5/16 18 0.0523 5760 5240 6550 5760
    3/8 16 0.0774 8510 7740 9675 8510
    7/16 14 0.1063 11690 10630 13290 11690
    1/2 13 0.1419 15610 14190 1740 15610
    9/16 12 0.182 20020 18200 22750 20020
    5/8 11 0.226 24860 22600 28250 24860
    3/4 10 0.334 36740 33400 41750 36740
    7/8 9 0.462 46200 41580 53130 46200
    1 8 0.606 60600 54540 69690 60600
    1-1/8 8 0.709 75050 67150 82950 75050
    1-1/4 8 1 95000 85000 105000 95000
    1-3/8 8 1.233 110970 98640 123300 110970
    1-1/2 8 1.492 134280 119360 149200 134280
    Source: ASTM A194-11

    Note 1 – Proof Loads are not Design Loads
    B – Based on proof stress of 110 000 psi up to 3⁄4 in.; 100 000 psi 7⁄8 to 1 in.; 95 000 psi 11⁄8 to 11⁄4 in.; 90 000 psi 13⁄8 to 11⁄2 in.
    C – Based on proof stress of 100 000 psi up to 3⁄4 in.; 90 000 psi 7⁄8 to 1 in.; 85 000 psi 11⁄8 to 11⁄4 in.; 80 000 psi 13⁄8 to 11⁄2 in.
    D – Based on proof stress of 125 000 psi up to 3⁄4 in.; 115 000 psi 7⁄8 to 1 in.; 105 000 psi 11⁄8 to 11⁄4 in.; 100 000 psi 13⁄8 to 11⁄2 in.

    Table 10: Proof Load for Large Heavy Hex Nuts

    Nominal Size Threads
    per Inc
    Stress
    Area in ²
    Proof Load lbf ᴮ for
    2H Heavy Hex
    Proof Load lbfᴮ
    Grade 6 Heavy Hex
    1-5/8 8 1.78 311500 267000
    1-3/4 8 2.08 364000 312000
    1-7/8 8 2.41 421800 361500
    2 8 2.77 484800 415500
    2-1/4 8 3.56 623000 534000
    2-1/2 8 4.44 777000 666000
    2-3/4 8 5.43 950250 814500
    Source: ASTM A194-11

    A – ASME B 18.2.2 in the size range over 11⁄2 in. provides dimensions only for heavy hex nuts. Refer to 8.3.1.
    B – Proof loads for nuts of larger dimensions or other thread series may be calculated by multiplying the thread stress area times the proof stress in the notes to Table 3 or Table 8.
    The proof load for jam nuts shall be 46 % of the tabulated load.

    Types of Available ASTM A194 GR.8 Fasteners

    Washer A194 2h A194 2h Nuts
    Astm A194 Washer Sa194 Nut
    A194-8 Washer Hex Nut Sa194
    A194 Bolts Sa 194 B8 Nuts
    Bolt A194 2h Nut Sa194-2h
    A194 B7 Bolts Sa 194 Heavy Hex Nut
    A194 Portland Bolt A194 2h Nut
    Astm A194 Bolts A194 Gr3 Nut
    Astm A194 Bolt Nut A194 Gr 4
    Bolt Nut A194 A194 Grade 4 Nut
    Sa194 Bolt A194-7 Nut
    A194 Nut And A563 A194 Grade 7 Nut
    A194 Nut Material A194-7 Nuts
    Nut A194 2h A194-8 Nut
    Nut A194 Gr.7 A194 8f Nut
    Nut A194 Grade 8 A194 Grade 8 Nut
    Nut Astm A194 2h Astm A194 8m Nut
    Astm A194 Nut Sizes A194 Gr 8m Nut
    Nut Astm A194 Gr 2h A194 2h Hex Nut
    A194 B8 Nut Astm A194 Hex Nut
    A194-B8m Nut A194 Grade 7 Hex Nut
    A194 B7 Nut A194 L7 Nut
    Astm A194 B8 Nut A194 Lock Nut
    A194 Coupling Nut A194 2h Lock Nut
    A194 2h Coupling Nut A194 Nuts
    A194 Gr 8 Nut A194 Hex Nut
    A194 Gr 7 Nut A194 Heavy Hex Nut



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    Astm A194 Grade 2H Hex Nut / A194 B7 /A194 B8 Heavy Hex Nut/ A194 B8m Heavy Hex Nut- A194 GR 7/A194 Gr. 8/ A194 Gr. 8F Nut Material Equivalent / Chemical Composition / Mechanical Properties / Specification, Torque & Mechanical Properties, Marking Bolts & Yield Strength / Nut Dimensions & Washer Dimensions