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    A286 Flat Head Screws

    A286 Flat Head Screws

    TorqBolt Inc. is a leading manufacturer and supplier of A286 Flat Head Screws for top-notch fastening applications in various industries. We stock the best quality Alloy A286 products in large varieties, especially in sizes, shapes, and configurations. When customers seek a product of a particular specification, our engineers make extraordinary efforts to design and produce the required product. Alloy A286 is a super-alloy material with creep resistance, oxidation resistance, and corrosion resistance. At elevated temperatures of up to 1300°F (700°C), the A286 Flat Head Screws provide high levels of strength. One can also superior performance even in the strong acid environments, however, it is not recommended to exercise such methods.

    Table Of Contents

    A286 Flat Head Screw Chemical Properties

    Nickel 24.0-27.0
    Iron Balance*
    Chromium 13.5-16.0
    Titanium 1.90-2.35
    Molybdenum 1.0-1.5
    Vanadium 0.10-0.50
    Carbon 0.08 max.
    Manganese 2 max.
    Silicon 1 max.
    Aluminum 0.35 max.
    Sulfur 0.03 max.
    Boron 0.001-0.01

    A286 Flat Countersunk Head Chemical Composition

    VdTÜV Werkstoffblatt 435 DIN EN 10269 ASTM A453 Grade 660
    C, max. 0,08 0,03 - 0,08 0,08
    Mn, max. 2,00 1,00 - 2,00 2,00
    P, max. 0,030 0,025 0,040
    S, max. 0,030 0,015 0,030
    Si, max. 1,00 1,00 1,00
    Cr 13,5 - 16,0 13,5 - 16,0 13,5 - 16,0
    Ni 24,0 - 27,0 24,0 - 27,0 24,0 - 27,0
    Mo 1,00 - 1,50 1,00 - 1,50 1,00 - 1,50
    Ti 1,9 - 2,3 1,90 - 2,30 1,90 - 2,35
    Al, max. 0,35 0,35 0,35
    V 0,10 - 0,50 0,10 - 0,50 0,10 - 0,50
    B 0,003 - 0,010 0,003 - 0,010 0,001 - 0,010

    A286 Flat Head Screw Mechanical Properties

    Temp Ultimate Tensile Strength 0.2% Yield Strength Elong in 2″ Reduction of Area Charpy V-notch
    °F psi psi % % ft-lb
    RT* 95,000* 50,000* 40* - -
    RT 145000 95000 24 43 -
    400 143000 93000 21 53 59
    800 138000 93000 18 35 51
    1000 131000 87000 18 31 45
    1200 103000 88000 13 14 35
    1400 64000 62000 18 23 -

    A286 Slotted 100-Degree Flat Countersunk Head Machine Screws ANSI B18.6.3

    Alloy A286 Slotted 100-Degree Flat Countersunk Head Machine Screws ANSI B18.6.3
    Alloy A286 Slotted 100-Degree Flat Countersunk Head Machine Screws
    ANSI B18.6.3
    Nom Size Basic Dia Basic F Max F Min F Max G Min G Max G1 Min G1 Max H Min H
    0 0.06 5/32 0.156 0.15 0.221 0.206 0.18 0.171 0.05 0.043
    1 0.073 5/32 0.156 0.15 0.221 0.206 0.18 0.171 0.05 0.043
    2 0.086 3/16 0.188 0.18 0.265 0.247 0.217 0.205 0.066 0.057
    3 0.099 3/16 0.188 0.18 0.265 0.247 0.217 0.205 0.066 0.057
    4 0.112 1/4 0.25 0.241 0.354 0.331 0.289 0.275 0.098 0.087
    5 0.125 5/16 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.102
    6 0.138 5/16 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.102
    1/4 0.164 11/32 0.344 0.332 0.486 0.456 0.397 0.378 0.13 0.117
    10 0.19 3/8 0.375 0.362 0.53 0.497 0.433 0.413 0.13 0.117
    12 0.216 7/16 0.438 0.423 0.619 0.581 0.505 0.482 0.161 0.148
    1/4 0.25 7/16 0.438 0.423 0.619 0.581 0.505 0.482 0.193 0.178
    5/16 0.3125 9/16 0.562 0.545 0.795 0.748 0.65 0.621 0.225 0.208
    3/8 0.375 5/8 0.625 0.607 0.884 0.833 0.722 0.692 0.257 0.239
    • All dimensions in inches.
    • Hexagon machine screw nuts have tops flat and chamfered. Diameter of top circle should be the maximum width across flats within a tolerance of minus 15 per cent. Bottoms are flat but may be chamfered if so specified. Square machine screw nuts have tops and bottoms flat without chamfer.

    A286 Slotted Flat Countersunk Head and Close Tolerance 100-Degree Flat Countersunk Head Machine Screws ANSI B18.6.3

    A286 Slotted Flat Countersunk Head and Close Tolerance 100-Degree Flat Countersunk Head Machine Screws ANSI B18.6.3
    Cres A286 Slotted Flat Countersunk Head and Close Tolerance 100-Degree Flat Countersunk Head Machine Screws
    ANSI B18.6.3
    Nominal Sizea or Basic Screw Dia. Head Dia., A Head Height, H Slot Width, J Slot Depth, T
    Max., Edge Sharp Min., Edge Rounded or Flat Ref. Max. Min. Max. Min.
    0000 0.0210 0.043 0.037 0.009 0.008 0.005 0.008 0.004
    000 0.0340 0.064 0.058 0.014 0.012 0.008 0.011 0.007
    00 0.0470 0.093 0.085 0.020 0.017 0.010 0.013 0.008
    0 0.0600 0.119 0.096 0.026 0.023 0.016 0.013 0.008
    1 0.0730 0.146 0.120 0.031 0.026 0.019 0.016 0.010
    2 0.0860 0.172 0.143 0.037 0.031 0.023 0.019 0.012
    3 0.0990 0.199 0.167 0.043 0.035 0.027 0.022 0.014
    4 0.1120 0.225 0.191 0.049 0.039 0.031 0.024 0.017
    1/4 (0.2500) 0.1380 0.279 0.238 0.060 0.048 0.039 0.030 0.022
    8 0.1640 0.332 0.285 0.072 0.054 0.045 0.036 0.027
    10 0.1900 0.385 7/16 0.438 0.060 0.050 0.042 0.031
    1/4 0.2500 0.507 0.442 0.110 0.075 0.064 0.055 0.042
    5/16 0.3125 0.635 0.556 0.138 0.084 0.072 0.069 0.053
    3/8 0.3750 0.762 0.670 0.165 0.094 0.081 0.083 0.065
    • a When specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted.
    • All dimensions are in inches.

    A286 Slotted Undercut Flat Countersunk Head Type Machine Screws ANSI B18.6.3

    A286 Slotted Undercut Flat Countersunk Head Type Machine Screws ANSI B18.6.3
    A286 Slotted Undercut Flat Countersunk Head Type Machine Screws
    ANSI B18.6.3
    SLOTTED FLAT,COUNTERSUNK HEAD TYPE
    Nominal Sizea or Basic Screw Dia. Max.,Lb Head Dia., A Head Height, H Slot Width, J Slot Depth, T
    Max., Edge Sharp Min., Edge c Ref. Max. Min. Max. Min.
    0000 0.0210 …. 0.043 0.037 0.011 0.008 0.004 0.007 0.003
    000 0.0340 …. 0.064 0.058 0.016 0.011 0.007 0.009 0.005
    00 0.0470 …. 0.093 0.085 0.028 0.017 0.010 0.014 0.009
    0 0.0600 1/8 0.119 0.099 0.035 0.023 0.016 0.015 0.010
    1 0.0730 1/8 0.146 0.123 0.043 0.026 0.019 0.019 0.012
    2 0.0860 1/8 0.172 0.147 0.051 0.031 0.023 0.023 0.015
    3 0.0990 1/8 0.199 0.171 0.059 0.035 0.027 0.027 0.017
    4 0.1120 3/,16 0.225 0.195 0.067 0.039 0.031 0.030 0.020
    5 0.1250 3/,16 0.252 0.220 0.075 0.043 0.035 0.034 0.022
    6 0.1380 3/,16 0.279 0.244 0.083 0.048 0.039 0.038 0.024
    8 0.1640 1/4 0.332 0.292 0.100 0.054 0.045 0.045 0.029
    10 0.1900 5/16 0.385 0.340 0.116 0.060 0.050 0.053 0.034
    1/4
    (0.2500)    		 0.2160 3/8 0.438 0.389 0.132 0.067 0.056 0.060 0.039
    1/4 0.2500 7/16 0.507 0.452 0.153 0.075 0.064 0.070 0.046
    5/16 0.3125 1/2 0.438 0.568 0.191 0.084 0.072 0.088 0.058
    3/8 0.3750 9/16 0.762 0.685 0.230 0.094 0.081 0.106 0.070
    7/16 0.4375 5/8 0.812 0.723 0.223 0.094 0.081 0.103 0.066
    1/2 0.5000 3/4 0.875 0.775 0.223 0.106 0.091 0.103 0.065
    9/16 0.5625 … 1.000 0.889 0.260 0.118 0.102 0.120 0.077
    5/,8 0.6250 … 1.125 1.002 0.298 0.133 0.116 0.137 0.088
    3/,4 0.7500 … 1.375 1.230 0.372 0.149 0.131 0.171 0.111
    • a When specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted.
    • b These lengths or shorter are undercut.
    • c May be rounded or flat.
    CLOSE TOLERANCE 100-DEGREE FLAT COUNTERSUNK HEAD TYPE
    Nominal Sizea or Basic Screw Dia. Head Dia., A Head Height, H Slot Width, J Slot Depth, T
    Max., Edge Sharp Min., Edge c Ref. Max. Min. Max. Min.
    4 0.1120 0.225 0.191 0.049 0.039 0.031 0.024 0.017
    6 0.1380 0.279 0.238 0.060 0.048 0.039 0.030 0.022
    8 0.1640 0.332 0.285 0.072 0.054 0.045 0.036 0.027
    10 0.1900 0.385 0.333 0.083 0.060 0.050 0.042 0.031
    1⁄4 0.2500 0.507 0.442 0.110 0.075 0.064 0.055 0.042
    5⁄16 0.3125 0.635 0.556 0.138 0.084 0.072 0.069 0.053
    3⁄8 0.3750 0.762 0.670 0.165 0.094 0.081 0.083 0.065
    7⁄16 0.4375 0.890 0.783 0.193 0.094 0.081 0.097 0.076
    1⁄2 0.5000 1.017 0.897 0.221 0.106 0.091 0.111 0.088
    9⁄16 0.5625 1.145 1.011 0.249 0.118 0.102 0.125 0.099
    5⁄8 0.6250 1.272 1.124 0.276 0.133 0.116 0.139 0.111
    • All dimensions are in inches.

    Slotted, Cross and Square Recessed Flat Countersunk Head Metric Machine Screws ANSI/ASME B18.6.7M

    Slotted, Cross and Square Recessed Flat Countersunk Head Metric Machine Screws ANSI/ASME B18.6.7M
    Slotted, Cross and Square Recessed Flat Countersunk Head Metric Machine Screws
    ANSI/ASME B18.6.7M
    Nominal Screw Size and Thread Pitch Slotted and Style A Style B Dk K R N T
    DS DSHa DS LSHa
    Body Diameter Body and Shoulder Diameter Shoulder Diameter Body Diameter Shoulder Length Head Diameter Head Height Underhead Fillet Radius Slot Width Slot Depth
    Theoretical Sharp Actual
    Max Min Max Min Min Max Min Max Min Min Max Ref Max Min Max Min Max Min
    M2 × 0.4b 2.00 1.65 2.00 1.86 1.65 0.50 0.30 4.4 4.1 3.5 1.2 0.8 0.4 0.7 0.5 0.6 0.4
    M2.5 × 0.45 2.50 2.12 2.50 2.36 2.12 0.55 0.35 5.5 5.1 4.4 1.5 1.0 0.5 0.8 0.6 0.7 0.5
    M3 × 0.5 3.00 2.58 3.00 2.86 2.58 0.60 0.40 6.3 5.9 5.2 1.7 1.2 0.6 1.0 0.8 0.9 0.6
    M3.5 × 0.6 3.50 3.00 3.50 3.32 3.00 0.70 0.50 8.2 7.7 6.9 2.3 1.4 0.7 1.2 1.0 1.2 0.9
    M4 × 0.7 4.00 3.43 4.00 3.82 3.43 0.80 0.60 9.4 8.9 8.0 2.7 1.6 0.8 1.5 1.2 1.3 1.0
    M5 × 0.8 5.00 4.36 5.00 4.82 4.36 0.90 0.70 10.4 9.8 8.9 2.7 2.0 1.0 1.5 1.2 1.4 1.1
    M6 × 1 6.00 5.21 6.00 5.82 5.21 1.10 0.90 12.6 11.9 10.9 3.3 2.4 1.2 1.9 1.6 1.6 1.2
    M8 × 1.25 8.00 7.04 8.00 7.78 7.04 1.40 1.10 17.3 16.5 15.4 4.6 3.2 1.6 2.3 2.0 2.3 1.8
    M10 × 1.5 10.00 8.86 10.00 9.78 8.86 1.70 1.30 20.0 19.2 17.8 5.0 4.0 2.0 2.8 2.5 2.6 2.0
    • a All recessed head heat-treated steel screws of property class 9.8 or higher strength have the Style B head form. Recessed head screws other than those specifically designated to be Style B have the Style A head form. The underhead shoulder on the Style B head form is mandatory and all other head dimensions are common to both the Style A and Style B head forms.
    • b This size is not specified for Type III square recessed flat countersunk heads; Type II cross recess is not specified for any size.
    • All dimensions in millimeters.

    A286 Flat Head Screw Specifications

    Aecma Specifications
    • AECMA PrEn2171
    • AECMA PrEN2119
    • AECMA PrEN2172
    • AECMA PrEN2173
    • AECMA PrEN2174
    • AECMA PrEN2303
    • AECMA PrEN2304
    • AECMA PrEN2398
    • AECMA PrEN2399
    • AECMA PrEN3510
    • A286 AMS 5737
    • A286 AMS 5853
    • A286 AMS 5895
    • A286 AMS 5726
    • A286 AMS 5731
    • A286 AMS 5732
    • A286 AMS 5734
    • ASME SA 891 (Type 1, 2)
    • ASME SA 638 (Grade 660 Type 1, 2)
    • ASME SA 453 (Grade 660 Class A, B, C, D)
    • ASTM A891 (Type 1, 2)
    • ASTM A638 (Grade 660 Type 1, 2)
    • ASTM A453 (Grade 660 Class A, B, C, D)
    • BS HR 51
    • BS HR 52
    • X5NiCrTi26-15
    • X4NiCrTi25-15
    • X6NiCrTiMoVB25-15-2
    • GE C50TF78
    • GE C50TF27
    • GE C50TF20
    • GE B50T1181C
    • UNS S66286
    • SAE J467-A286
    • SPS M-118
    • Fairchild MS 301
    • 314 Elliott Turbine MS 618 Weatherford WS-881
    • Cameron MS-003030
    • EN 2399
    • PWA-LCS
    • GE-S400/1000
    • RR SABRe Edition 2
    • EN 1.4944
    • EN 1.4943
    • EN 1.4980
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