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DIN604 Flat Countersunk Nib Bolts 12.9 Carbon Steel Bolt

Categories Self Tapping Screw
Brand Name: QBH
Model Number: DIN604
Certification: ISO9001
Place of Origin: CHINA
MOQ: 900kg
Price: Negotiation
Payment Terms: L/C, T/T,OA
Supply Ability: 200TON/MONTH
Delivery Time: 30days
Packaging Details: 25kg Carton+900kg/Pallet
Material: Carbon steel
Size: M6-M24
Surface treatment: Plain,Zinc,Black,H.D.G
Grade: 6.8/8.8/10.9/12.9
Process: Cold Forging
Sample: Free Sample
Packaging: 25kg Carton+900kg/Pallet
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    DIN604 Flat Countersunk Nib Bolts 12.9 Carbon Steel Bolt

    DIN 604 - Flat countersunk nib bolts with hexagon nut

    Current norm: DIN 604
    Equivalent norms: CSN 021324; PN 82408; UNI 6105;

    Countersunk Nib Bolts are generally used for steel or timber applications where a flat, countersunk finish is required on the fastened surface.

    Similar to a Plow Bolt but instead of a square neck recess, a keyway is cut into the countersunk recess to seat the nib, allowing the bolt to be nut tightened and secured in place

    Legend:

    b - length of the thread (at least)
    l - length of bolt
    d - the nominal diameter of the thread
    k - head height
    ds - diameter of the screw shank
    g - width of the nib
    dk - head diameter
    i - height of the nose
    lg - length of the thread
    ls - length of the shank to the start of the thread
    α - angle head

    Makings:QBH

    Steel: 3.6,4.6
    Stainless: -
    Plastic: -
    Non Ferrous: -
    Thread: 8g

    Notes:

    Screw Thread
    d
    M6 M8 M10 M12 M16 M20 M24
    P Pitch
    b L≤125
    125<L≤200
    L>200
    dk max
    min
    s max
    min
    k max
    α min
    max
    1.00 1.25 1.50 1.75 2.00 2.50 3.00
    18 22 26 30 38 46 54
    24 28 32 36 44 52 60
    41 45 49 57 65 73
    12.55 16.55 19.65 24.65 32.80 32.80 38.80
    11.45 15.45 18.35 23.35 31.20 31.20 37.20
    2.50 3.00 3.20 3.60 4.20 5.40 6.60
    2.10 2.60 2.72 3.12 3.72 4.92 6.02
    4.00 5.00 5.50 7.00 9.00 11.50 13.00
    90° 90° 90° 90° 90° 60° 60°
    95° 95° 95° 95° 95° 65° 65°

    Process flow

    Cold forging

    Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment(if need)Finish Packing

    Product Grade

    Class4.8 Class5.8 Class6.8 Class8.8 Class10.9

    Mechanical property

    NO. Mechanical or
    physical property
    Property class
    4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9/12.9
    D≤16mma d>16mmb d≤16mm
    1 Tensile strength
    Rm,Mpa
    nom.c 400 500 600 800 900 1000 1200
    max. 400 420 500 520 600 800 830 900 1040 1220
    2 Lower yield strength
    ReL,Mpa
    nom.c 240 —— 300 —— —— —— —— —— —— ——
    max. 240 —— 300 —— —— —— —— —— —— ——
    3 Stress at 0,2 % nonproportional elongation
    Rp0.2,Mpa
    nom.c —— —— —— —— —— 640 640 720 900 1080
    max. —— —— —— —— —— 640 660 720 940 1100
    4 Stress at 0,0048 d non-proportional elongation for
    full-size fasteners
    Rpf,Mpa
    nom.c —— 320 —— 400 480 —— —— —— —— ——
    max. —— 340e —— 420e 480e —— —— —— —— ——
    5 Stress under proof load
    Spf,Mpa
    nom. 225 310 280 380 440 580 600 650 830 970
    Proof Sp,nom/ReL min Or
    strength Sp,nom/Rp0.2min Or
    rati Sp,nom/Rpf min

    0.94 0.91 0.93 0.9 0.92 0.91 0.91 0.9 0.88 0.88
    6 Percentage elongation
    after fracture for
    machined test pieces,A,%
    min. 22 -— 20 —— —— 12 12 10 9 8
    7 Percentage reduction of area after
    fracture for machined test pieces,Z,%
    min. —— 52 48 48 44
    8 Elongation after fracture for full-size
    fasteners,Af
    min. —— 0.24 —— 0.22 0.2 —— —— —— —— ——
    9 Head soundness No fracture
    10 Vickers hardness, HV,
    F≥98N
    min. 120 130 155 160 190 250 255 290 320 385
    max. 220g 250 320 335 360 380 435
    11 Brinell hardness, HBW
    ,F=30D²
    min. 114 124 147 152 181 238 242 276 304 366
    max. 209g 238 304 318 342 361 414
    12 Rockwell hardness,HRB ,
    HRB
    min. 67 71 79 82 89  
    max. 95g 99.5  
    Rockwell hardness,
    HRC
    min. —— 22 23 28 32 39
    max. —— 32 34 37 39 44
    13 Surface hardness
    HV 0.3
    max. —— h h,j h,j
    14 Height of non-decarburized thread zone,E,mm min. —— 1/2H1 2/3H1 3/4H1
    Depth of complete decarburization in the
    thread,G,mm
    max. —— 0.015
    15 Reduction of hardness after retempering,HV max. —— 20
    16 Breaking torque,
    MB,N·m
    min. —— in accordance with ISO 898-7
    17 Impact strength,
    KVK,I,J
    min. —— 27 —— 27 27 27 27 m
    18 Surface integrity in accordance with ISO 6157-1n ISO 6157-3
    a Values do not apply for structural bolting.
    b For structural bolting d W M12.
    c Nominal values are specified only for the purpose of the designation system for property classes.See Clause 5.
    d In cases where the lower yield strength ReL cannot be determined, it is permissible to measure the stress at 0,2 % non-proportional elongation Rp0,2.
    e For the property classes 4.8, 5.8 and 6.8 the values for Rpf min are under investigation. The present values are given for calculation of the proof stress ratio only. They are not test values.
    f Proof loads are specified in Tables 5 and 7.
    g Hardness determined at the end of a fastener shall be 250 HV, 238 HB or 99,5 HRB maximum.
    h Surface hardness shall not be more than 30 Vickers points above the measured core hardness of the fastener when determination of both surface hardness and core hardness are carried out with HV 0,3.
    i Any increase in hardness at the surface which indicates that the surface hardness exceeds 390 HV is not acceptable.
    j Any increase in hardness at the surface which indicates that the surface hardness exceeds 435 HV is not acceptable.
    k Values are determined at a test temperature of −20 °C, see 9.14.
    l Applies to d W 16 mm. m Value for KV is under investigation.
    n Instead of ISO 6157-1, ISO 6157-3 may apply by agreement between the manufacturer and the purchaser.


    Materials and Chemical compstition

    1008

    CHEMICAL COMPOSI %
    C Si Mn P S Cr Ni Cu Al
    0.06 0.06 0.33 0.013 0.003 0.01 0 0.01 0.028

    1035

    CHEMICAL COMPOSI %
    C Si Mn P S Cr Ni Cu
    0.34 0.13 0.73 0.012 0.002 0.02 0.01 0.02

    10B21

    CHEMICAL COMPOSI %
    C Si Mn P S Cr B
    0.2 0.04 0.81 0.017 0.007 0.017 0.0021

    1045

    CHEMICAL COMPOSI %
    C Si Mn P S Cr Ni Cu
    0.45 0.23 0.58 0.014 0.006 0.057 0.008 0.016

    40CR

    CHEMICAL COMPOSI %
    C Si Mn P S Cr Ni Cu
    0.4 0.21 0.54 0.015 0.008 0.95 0.02 0.02

    35CRMO

    CHEMICAL COMPOSI %
    C Si Mn P S Cr Ni Cu Mo
    0.35 0.22 0.59 0.01 0.003 0.93 0.01 0.01 0.21

    42CRMO

    CHEMICAL COMPOSI %
    C Si Mn P S Cr Ni Cu Mo
    0.42 0.27 0.92 0.013 0.004 1.01 0.03 0.04 0.2

    Finish

    PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON

    PACKING

    QBH BULK

    20-25KG/CTN,36CTNS/PALLET

    20-30KG/BAGS,36BAGS/PALLET

    ONE TON/BOXES

    50KG/ IRON DRUM,12 IRON DRUMS/PALLET

    QBH SMALL PACKING

    Packing in small boxes according to customer’s requirements

    Packing in plastic bag according to customer’s requirements

    QBH PALLET TYPE

    SOLID WOOD FUMIGATION PALLET

    EURO Pallet

    THREE SPLINT PALLET

    WOODEN BOX

    The advantages of QBH

    • QBH brand sales to the main quality assurance.
    • Years of export trade management, excellent service, word-of-mouth guarantee.
    • By working with TUV,escort for quality.
    • Customization of non-standard parts can be made according to customer's requirements and drawings.
    • For quality customers,we can provide a certain credit period.


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