Qbh Stainless Carbon Steel Hex Hexagon Head ASME Lag Screw

DIN571 Carbon Steel Wzp Hexagonal & Bugle Head Wood Self TappingScrew Coil Ring NailLegend:b - length of the thread (at least)l - length of boltk - head heighte - the diameter of the circumscribed circle (not less than)s - size hex head turnkeySelf Drilling Screw ( Please Click the Following Picture)Anchor Screw ( Please Click the Following Picture)Makings:QBHSteel: steelStainless: A2, A4Plastic: -Non Ferrous: -Thread: as DIN 7998Table according to DIN 571:Thread456-7810121620dsnominalsize max.4567810121620min.3,524,525,526,427,429,4211,315,319,3damax.567,28,210,212,215,219,224,4knominalsize2,83,5455,5781013max.3,13,884,385,385,887,458,4510,4513,9min.2,53,133,634,635,136,557,559,5512,1snominalsize7810121317192430max.7810121317192430min.6,647,649,6411,5712,5716,5718,4823,1629,16emin.7,58,6310,8913,0714,218,7220,8826,1732,95l weight kg/1000pcsnominalsizemin.max.1615,116,91,71292       2018,9521,052,013,425,02      2523,9526,052,414,025,82 11,5    3028,9531,052,814,626,62 12,923,6   3533,7536,253,115,127,42 14,225,836,2  4038,7541,253,515,828,22 15,62839,2  4543,7546,25  8,94 16,93042,1  5048,7551,25  9,64 18,232,145,484,1 5553,556,5  10,5 19,634,348,689,7 6058,561,5  11,2 20,936,551,894,91656563,566,5    22,238,554,799,51747068,571,5    23,640,757,81071827573,576,5    2542,9611121928078,581,5    26,545,264,51182019088,2591,75    29,449,97113022010098,25101,75    325477,1141238110108,25111,75      83,4152253120118,25121,75      89,5163275130128132       175293140138142       187317150148152       198328160158162       209348170168172        366180178182        385190187,7192,3        404200197,7202,3        421   Process flowCold forgingAnnealing treatment(if need)  -> wiredrawing -> clod forging -> thread rolling -> make heat treatment(if need)  -> Finish  Packing Hot forgingCutting material -> hot forging -> turning -> shrink diameter(half thread) -> thread rolling -> make heat treatment(if need) -> Finish -> Packing Product GradeClass4.8 Class5.8 Class6.8 Class8.8 Class10.9 Class12.9NO.Mechanical orphysical propertyProperty class4.64.85.65.86.88.89.810.912.9/12.9D≤16mmad>16mmbd≤16mm1Tensile strengthRm,Mpanom.c40050060080090010001200max.400420500520600800830900104012202Lower yield strengthReL,Mpanom.c240--300--------------max.240--300--------------3Stress at 0,2 % nonproportional elongationRp0.2,Mpanom.c----------6406407209001080max.----------64066072094011004Stress at 0,0048 d non-proportional elongation forfull-size fastenersRpf,Mpanom.c--320--400480----------max.--340e--420e480e----------5Stress under proof loadSpf,Mpanom.225310280380440580600650830970Proof Sp,nom/ReL min Orstrength Sp,nom/Rp0.2min Orrati Sp,nom/Rpf min 0.940.910.930.90.920.910.910.90.880.886Percentage elongationafter fracture formachined test pieces,A,%min.22--20----121210987Percentage reduction of area afterfracture for machined test pieces,Z,%min.--524848448Elongation after fracture for full-sizefasteners,Afmin.--0.24--0.220.2----------9Head soundnessNo fracture10Vickers hardness, HV,F≥98Nmin.120130155160190250255290320385max.220g25032033536038043511Brinell hardness, HBW,F=30D²min.114124147152181238242276304366max.209g23830431834236141412Rockwell hardness,HRB ,HRBmin.6771798289 max.95g99.5 Rockwell hardness,HRCmin.--2223283239max.--323437394413Surface hardnessHV 0.3max.--hh,jh,j14Height of non-decarburized thread zone,E,mmmin.--1/2H12/3H13/4H1Depth of complete decarburization in thethread,G,mmmax.--0.01515Reduction of hardness after retempering,HVmax.--2016Breaking torque,MB,N·mmin.--in accordance with ISO 898-717Impact strength,KVK,I,Jmin.--27--27272727m18Surface integrity in accordance withISO 6157-1nISO 6157-3a 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 an