\n| M64 x 6<\/td>\n | \u2013<\/td>\n | 92.8<\/td>\n | 95<\/td>\n | \u2013<\/td>\n | 104.86<\/td>\n | \u2013<\/td>\n | \u2013<\/td>\n | 39.5<\/td>\n | 40.5<\/td>\n | 2<\/td>\n | \u2013<\/td>\n | \u2013<\/td>\n | 153<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n\n \n \n H\u00f3a h\u1ecdc<\/h3>\n\n\n\n| Property Class<\/th>\n | Material and heat treatment<\/th>\n | Chemical Composition Limit
\n(cast analysis, %)<\/th>\n | Tempering
\nTemp, \u00baC, min<\/th>\n<\/tr>\n | \n| C<\/th>\n | P, max<\/th>\n | S, max<\/th>\n | B, max<\/th>\n<\/tr>\n<\/thead>\n | \n\n| 4.6<\/td>\n | Carbon steel or carbon steel with additives<\/td>\n | 0.55 max<\/td>\n | 0.05<\/td>\n | 0.06<\/td>\n | Not specified<\/td>\n | \u2013<\/td>\n<\/tr>\n | \n| 4.8<\/td>\n<\/tr>\n | \n| 5.6<\/td>\n | 0.13 \u2013 0.55<\/td>\n<\/tr>\n | \n| 5.8<\/td>\n | 0.55 max<\/td>\n<\/tr>\n | \n| 6.8<\/td>\n | 0.15 \u2013 0.55<\/td>\n<\/tr>\n | \n| 8.8<\/td>\n | Carbon steel with additives (e.g. Boron or Mn or Cr)
\nquenched and tempered<\/td>\n | 0.15 \u2013 0.40<\/td>\n | 0.025<\/td>\n | 0.025<\/td>\n | 0.003<\/td>\n | 425<\/td>\n<\/tr>\n | \n| Carbon steel quenched and tempered<\/td>\n | 0.25 \u2013 0.55<\/td>\n<\/tr>\n | \n| Alloy steel quenched and tempered<\/td>\n | 0.20 \u2013 0.55<\/td>\n<\/tr>\n | \n| 9.8<\/td>\n | Carbon steel with additives (e.g. Boron or Mn or Cr)
\nquenched and tempered<\/td>\n | 0.15 \u2013 0.40<\/td>\n | 0.025<\/td>\n | 0.025<\/td>\n | 0.003<\/td>\n | 425<\/td>\n<\/tr>\n | \n| Carbon steel quenched and tempered<\/td>\n | 0.25 \u2013 0.55<\/td>\n<\/tr>\n | \n| Alloy steel quenched and tempered<\/td>\n | 0.20 \u2013 0.55<\/td>\n<\/tr>\n | \n| 10.9<\/td>\n | Carbon steel with additives (e.g. Boron or Mn or Cr)
\nquenched and tempered<\/td>\n | 0.20 \u2013 0.55<\/td>\n | 0.025<\/td>\n | 0.025<\/td>\n | 0.003<\/td>\n | 425<\/td>\n<\/tr>\n | \n| Carbon steel quenched and tempered<\/td>\n | 0.25 \u2013 0.55<\/td>\n<\/tr>\n | \n| Alloy steel quenched and tempered<\/td>\n | 0.20 \u2013 0.55<\/td>\n<\/tr>\n | \n| 12.9<\/td>\n | Alloy steel quenched and tempered<\/td>\n | 0.30 \u2013 0.50<\/td>\n | 0.025<\/td>\n | 0.025<\/td>\n | 0.003<\/td>\n | 425<\/td>\n<\/tr>\n | \n| 12.9<\/td>\n | Carbon steel with additives (e.g. Boron or Mn or Cr
\nor Molybdenum) quenched and tempered<\/td>\n | 0.28 \u2013 0.50<\/td>\n | 0.025<\/td>\n | 0.025<\/td>\n | 0.003<\/td>\n | 380<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n\n \n C\u01a1 t\u00ednh<\/h3>\nMechanical Property<\/h4>\n\n\n\n| Mechanical Property<\/th>\n | Property Class<\/th>\n<\/tr>\n | \n| 4.6<\/th>\n | 4.8<\/th>\n | 5.6<\/th>\n | 5.8<\/th>\n | 6.8<\/th>\n | 8.8<\/th>\n | 9.8
\nM16 and under<\/th>\n | 10.9<\/th>\n | 12.9\/
\n12.9<\/th>\n<\/tr>\n | \nM16 and
\nunder<\/th>\n | Over M16<\/th>\n<\/tr>\n<\/thead>\n | \n\n| Tensile strength, Rm, MPa<\/td>\n | nom.<\/td>\n | 400<\/td>\n | 500<\/td>\n | 600<\/td>\n | 800<\/td>\n | 900<\/td>\n | 1000<\/td>\n | 1200<\/td>\n<\/tr>\n | \n| min.<\/td>\n | 400<\/td>\n | 420<\/td>\n | 500<\/td>\n | 520<\/td>\n | 600<\/td>\n | 800<\/td>\n | 830<\/td>\n | 900<\/td>\n | 1040<\/td>\n | 1220<\/td>\n<\/tr>\n | \n| Lower yield strength, ReL, MPa<\/td>\n | nom.<\/td>\n | 240<\/td>\n | \u2014<\/td>\n | 300<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n<\/tr>\n | \n| min.<\/td>\n | 240<\/td>\n | \u2014<\/td>\n | 300<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n<\/tr>\n | \nStress at 0,2 % non-proportional
\nelongation, Rp0,2, MPa<\/td>\n | nom.<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | 640<\/td>\n | 640<\/td>\n | 720<\/td>\n | 900<\/td>\n | 1080<\/td>\n<\/tr>\n | \n| min.<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | 640<\/td>\n | 660<\/td>\n | 720<\/td>\n | 940<\/td>\n | 1100<\/td>\n<\/tr>\n | \nStress at 0,0048 d non-proportional
\nelongation for full-size fasteners, Rpf, MPa<\/td>\n | nom.<\/td>\n | \u2014<\/td>\n | 320<\/td>\n | \u2014<\/td>\n | 400<\/td>\n | 480<\/td>\n | \u2014<\/td>\n<\/tr>\n | \n| min.<\/td>\n | \u2014<\/td>\n | 340<\/td>\n | \u2014<\/td>\n | 420<\/td>\n | 480<\/td>\n | \u2014<\/td>\n<\/tr>\n | \n| Stress under proof load, Sp, MPa<\/td>\n | nom.<\/td>\n | 225<\/td>\n | 310<\/td>\n | 280<\/td>\n | 380<\/td>\n | 440<\/td>\n | 440<\/td>\n | 600<\/td>\n | 650<\/td>\n | 830<\/td>\n | 970<\/td>\n<\/tr>\n | \n| Proof strength ratio<\/td>\n | Sp,nom\/ReL min
\nSp,nom\/Rp0,2 min
\nSp,nom\/Rpf min<\/td>\n | 0,94<\/td>\n | 0,91<\/td>\n | 0,93<\/td>\n | 0,90<\/td>\n | 0,92<\/td>\n | 0,91<\/td>\n | 0,91<\/td>\n | 0,90<\/td>\n | 0,88<\/td>\n | 0,88<\/td>\n<\/tr>\n | \nPercentage elongation after fracture for
\nmachined test pieces, A, %<\/td>\n | min.<\/td>\n | 22<\/td>\n | \u2014<\/td>\n | 20<\/td>\n | \u2014<\/td>\n | \u2014<\/td>\n | 12<\/td>\n | 12<\/td>\n | 10<\/td>\n | 9<\/td>\n | 8<\/td>\n<\/tr>\n | \nPercentage reduction of area after fracture for
\nmachined test pieces, Z, %<\/td>\n | min.<\/td>\n | \u2014<\/td>\n | 52<\/td>\n | 48<\/td>\n | 48<\/td>\n | 44<\/td>\n<\/tr>\n | \nElongation after fracture for full-size
\nfasteners, Af<\/td>\n | min.<\/td>\n | \u2014<\/td>\n | 0,24<\/td>\n | \u2014<\/td>\n | 0,22<\/td>\n | 0,20<\/td>\n | \u2014<\/td>\n<\/tr>\n | \n| Head soundness<\/td>\n | No fracture<\/td>\n<\/tr>\n | \nVickers hardness,
\nHV F \u2265 98 N<\/td>\n | min.<\/td>\n | 120<\/td>\n | 130<\/td>\n | 155<\/td>\n | 160<\/td>\n | 190<\/td>\n | 250<\/td>\n | 255<\/td>\n | 290<\/td>\n | 320<\/td>\n | 385<\/td>\n<\/tr>\n | \n| max.<\/td>\n | 220<\/td>\n | 250<\/td>\n | 320<\/td>\n | 335<\/td>\n | 360<\/td>\n | 380<\/td>\n | 435<\/td>\n<\/tr>\n | \nBrinell hardness, HBW
\nF = 30 D2<\/td>\n | min.<\/td>\n | 114<\/td>\n | 124<\/td>\n | 147<\/td>\n | 152<\/td>\n | 181<\/td>\n | 238<\/td>\n | 242<\/td>\n | 276<\/td>\n | 304<\/td>\n | 304<\/td>\n<\/tr>\n | \n| max.<\/td>\n | 209<\/td>\n | 238<\/td>\n | 304<\/td>\n | 318<\/td>\n | 342<\/td>\n | 361<\/td>\n | 414<\/td>\n<\/tr>\n | \n| Rockwell hardness, HRB<\/td>\n | min.<\/td>\n | 67<\/td>\n | 71<\/td>\n | 79<\/td>\n | 82<\/td>\n | 89<\/td>\n | \u2014<\/td>\n<\/tr>\n | \n| max.<\/td>\n | 95,0<\/td>\n | 89<\/td>\n | \u2014<\/td>\n<\/tr>\n | \n| Rockwell hardness, HRC<\/td>\n | min.<\/td>\n | \u2014<\/td>\n | 22<\/td>\n | 23<\/td>\n | 23<\/td>\n | 32<\/td>\n | 39<\/td>\n<\/tr>\n | \n| max.<\/td>\n | \u2014<\/td>\n | 32<\/td>\n | 34<\/td>\n | 37<\/td>\n | 39<\/td>\n | 44<\/td>\n<\/tr>\n | \n| Surface hardness, HV 0,3<\/td>\n | max.<\/td>\n | \u2014<\/td>\n | (1)<\/td>\n | (1),(2)<\/td>\n | (1).(3)<\/td>\n<\/tr>\n | \nHeight of non-decarburized thread zone,
\nE, mm<\/td>\n | min.<\/td>\n | \u2014<\/td>\n | 1\/2 H1<\/td>\n | 2\/3 H1<\/td>\n | 3\/4 H1<\/td>\n<\/tr>\n | \nDepth of complete decarburization
\nin the thread, G, mm<\/td>\n | max.<\/td>\n | \u2014<\/td>\n | 0,015<\/td>\n<\/tr>\n | \n| Reduction of hardness after retempering, HV<\/td>\n | max.<\/td>\n | \u2014<\/td>\n | 20<\/td>\n<\/tr>\n | \n| Breaking torque, MB, N\u22c5m<\/td>\n | min.<\/td>\n | \u2014<\/td>\n | in accordance with ISO 898-7<\/td>\n<\/tr>\n | \n| Impact strength, KV, J<\/td>\n | min.<\/td>\n | \u2014<\/td>\n | 27<\/td>\n | \u2014<\/td>\n | 27<\/td>\n | (4)<\/td>\n<\/tr>\n | \n| Surface integrity in accordance with<\/td>\n | ISO 6157-1<\/td>\n | ISO 6157-3<\/td>\n<\/tr>\n | \n(1) Surface hardness shall not be more than 30 Vickers points above the measured core hardness of the fastener when determination of both surface hardness
\nand core hardness are carried out with HV 0,3.
\n(2) Any increase in hardness at the surface which indicates that the surface hardness exceeds 390 HV is not acceptable.
\n(3) Any increase in hardness at the surface which indicates that the surface hardness exceeds 435 HV is not acceptable.
\n(4) Value for KV is under investigation.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nProof Load<\/h4>\n\n\n\nThread
\nd<\/th>\n | Nominal stress area
\nAs, nom, mm2<\/th>\n | Property class<\/th>\n<\/tr>\n | \n| 4.6<\/th>\n | 4.8<\/th>\n | 5.6<\/th>\n | 5.8<\/th>\n | 6.8<\/th>\n | 8.8<\/th>\n | 9.8<\/th>\n | 9.8<\/th>\n | 12.9\/12.9<\/th>\n<\/tr>\n | \n| Proof load, Fp (As,nom \u00d7 Sp,nom), N<\/th>\n<\/tr>\n<\/thead>\n | \n\n| M12<\/td>\n | 84,3<\/td>\n | 19 000<\/td>\n | 26 100<\/td>\n | 23 600<\/td>\n | 32 000<\/td>\n | 37 100<\/td>\n | 48 900<\/td>\n | 54 800<\/td>\n | 70 000<\/td>\n | 81 800<\/td>\n<\/tr>\n | \n| M16<\/td>\n | 157<\/td>\n | 35 300<\/td>\n | 48 700<\/td>\n | 44 000<\/td>\n | 59 700<\/td>\n | 69 100<\/td>\n | 91 000<\/td>\n | 102 000<\/td>\n | 130 000<\/td>\n | 152 000<\/td>\n<\/tr>\n | \n| M20<\/td>\n | 245<\/td>\n | 55 100<\/td>\n | 76 000<\/td>\n | 68 600<\/td>\n | 93 100<\/td>\n | 108 000<\/td>\n | 147 000<\/td>\n | \u2014<\/td>\n | 203 000<\/td>\n | 238 000<\/td>\n<\/tr>\n | \n| M22<\/td>\n | 303<\/td>\n | 68 200<\/td>\n | 93 900<\/td>\n | 84 800<\/td>\n | 115 000<\/td>\n | 133 000<\/td>\n | 182 000<\/td>\n | \u2014<\/td>\n | 252 000<\/td>\n | 294 000<\/td>\n<\/tr>\n | \n| M24<\/td>\n | 353<\/td>\n | 79 400<\/td>\n | 109 000<\/td>\n | 98 800<\/td>\n | 134 000<\/td>\n | 155 000<\/td>\n | 212 000<\/td>\n | \u2014<\/td>\n | 293 000<\/td>\n | 342 000<\/td>\n<\/tr>\n | \n| M27<\/td>\n | 459<\/td>\n | 103 000<\/td>\n | 142 000<\/td>\n | 128 000<\/td>\n | 174 000<\/td>\n | 202 000<\/td>\n | 275 000<\/td>\n | \u2014<\/td>\n | 381 000<\/td>\n | 445 000<\/td>\n<\/tr>\n | \n| M30<\/td>\n | 561<\/td>\n | 126 000<\/td>\n | 174 000<\/td>\n | 157 000<\/td>\n | 213 000<\/td>\n | 247 000<\/td>\n | 337 000<\/td>\n | \u2014<\/td>\n | 466 000<\/td>\n | 544 000<\/td>\n<\/tr>\n | \n| M33<\/td>\n | 694<\/td>\n | 156 000<\/td>\n | 215 000<\/td>\n | 194 000<\/td>\n | 264 000<\/td>\n | 305 000<\/td>\n | 416 000<\/td>\n | \u2014<\/td>\n | 576 000<\/td>\n | 673 000<\/td>\n<\/tr>\n | \n| M36<\/td>\n | 817<\/td>\n | 184 000<\/td>\n | 253 000<\/td>\n | 229 000<\/td>\n | 310 000<\/td>\n | 359 000<\/td>\n | 490 000<\/td>\n | \u2014<\/td>\n | 678 000<\/td>\n | 792 000<\/td>\n<\/tr>\n | \n| M39<\/td>\n | 976<\/td>\n | 220 000<\/td>\n | 303 000<\/td>\n | 273 000<\/td>\n | 371 000<\/td>\n | 429 000<\/td>\n | 586 000<\/td>\n | \u2014<\/td>\n | 810 000<\/td>\n | 947 000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nTensile Load<\/h4>\n\n\n\nThread
\nd<\/th>\n | Nominal stress area
\nAs, nom, mm2<\/th>\n | Property class<\/th>\n<\/tr>\n | \n| 4.6<\/th>\n | 4.8<\/th>\n | 5.6<\/th>\n | 5.8<\/th>\n | 6.8<\/th>\n | 8.8<\/th>\n | 9.8<\/th>\n | 9.8<\/th>\n | 12.9\/12.9<\/th>\n<\/tr>\n | \n| Minimum ultimate tensile load, Fm min (As, nom \u00d7 Rm, min), N<\/th>\n<\/tr>\n<\/thead>\n | \n\n| M12<\/td>\n | 84,3<\/td>\n | 33 700<\/td>\n | 35 400<\/td>\n | 42 200<\/td>\n | 43 800<\/td>\n | 50 600<\/td>\n | 67 400<\/td>\n | 75 900<\/td>\n | 87 700<\/td>\n | 103 000<\/td>\n<\/tr>\n | \n| M16<\/td>\n | 157<\/td>\n | 62 800<\/td>\n | 65 900<\/td>\n | 78 500<\/td>\n | 81 600<\/td>\n | 94 000<\/td>\n | 125 000<\/td>\n | 141 000<\/td>\n | 163 000<\/td>\n | 192 000<\/td>\n<\/tr>\n | \n| M20<\/td>\n | 245<\/td>\n | 98 000<\/td>\n | 103 000<\/td>\n | 122 000<\/td>\n | 127 000<\/td>\n | 147 000<\/td>\n | 203 000<\/td>\n | \u2014<\/td>\n | 255 000<\/td>\n | 299 000<\/td>\n<\/tr>\n | \n| M22<\/td>\n | 303<\/td>\n | 121 000<\/td>\n | 127 000<\/td>\n | 152 000<\/td>\n | 158 000<\/td>\n | 182 000<\/td>\n | 252 000<\/td>\n | \u2014<\/td>\n | 315 000<\/td>\n | 370 000<\/td>\n<\/tr>\n | \n| M24<\/td>\n | 353<\/td>\n | 141 000<\/td>\n | 148 000<\/td>\n | 176 000<\/td>\n | 184 000<\/td>\n | 212 000<\/td>\n | 293 000<\/td>\n | \u2014<\/td>\n | 367 000<\/td>\n | 431 000<\/td>\n<\/tr>\n | \n| M27<\/td>\n | 459<\/td>\n | 184 000<\/td>\n | 193 000<\/td>\n | 230 000<\/td>\n | 239 000<\/td>\n | 275 000<\/td>\n | 381 000<\/td>\n | \u2014<\/td>\n | 477 000<\/td>\n | 560 000<\/td>\n<\/tr>\n | \n| M30<\/td>\n | 561<\/td>\n | 224 000<\/td>\n | 236 000<\/td>\n | 280 000<\/td>\n | 292 000<\/td>\n | 337 000<\/td>\n | 466 000<\/td>\n | \u2014<\/td>\n | 583 000<\/td>\n | 684 000<\/td>\n<\/tr>\n | \n| M33<\/td>\n | 694<\/td>\n | 278 000<\/td>\n | 292 000<\/td>\n | 347 000<\/td>\n | 361 000<\/td>\n | 416 000<\/td>\n | 576 000<\/td>\n | \u2014<\/td>\n | 722 000<\/td>\n | 847 000<\/td>\n<\/tr>\n | \n| M36<\/td>\n | 817<\/td>\n | 327 000<\/td>\n | 343 000<\/td>\n | 408 000<\/td>\n | 425 000<\/td>\n | 490 000<\/td>\n | 678 000<\/td>\n | \u2014<\/td>\n | 850 000<\/td>\n | 997 000<\/td>\n<\/tr>\n | \n| M39<\/td>\n | 976<\/td>\n | 390 000<\/td>\n | 410 000<\/td>\n | 488 000<\/td>\n | 508 000<\/td>\n | 586 000<\/td>\n | 810 000<\/td>\n | \u2014<\/td>\n | 1 020 000<\/td>\n | 1 200 000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nL\u1edbp ph\u1ee7 c\u1ee7a ti\u00eau chu\u1ea9n ISO 4014<\/h2>\nTi\u00eau chu\u1ea9n kh\u00f4ng ch\u1ec9 \u0111\u1ecbnh b\u1ea5t k\u1ef3 l\u1edbp ph\u1ee7 ho\u1eb7c l\u1edbp ho\u00e0n thi\u1ec7n n\u00e0o cho bulong, v\u00ec vi\u1ec7c l\u1ef1a ch\u1ecdn l\u1edbp ph\u1ee7 t\u00f9y thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng v\u00e0 m\u00f4i tr\u01b0\u1eddng m\u00e0 bu l\u00f4ng s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n N\u00f3i nh\u01b0 v\u1eady, th\u00f4ng th\u01b0\u1eddng bulong ISO 4014 \u0111\u01b0\u1ee3c ph\u1ee7 nhi\u1ec1u l\u1edbp ho\u00e0n thi\u1ec7n kh\u00e1c nhau \u0111\u1ec3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 v\u1ebb ngo\u00e0i c\u1ee7a ch\u00fang. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u1edbp ph\u1ee7 ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho bulong ISO 4014:<\/p>\n \n- M\u1ea1 k\u1ebdm: \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng l\u1edbp ho\u00e0n thi\u1ec7n ph\u1ed5 bi\u1ebfn nh\u1ea5t cho bulong, bao g\u1ed3m c\u1ea3 bulong ISO 4014. M\u1ea1 k\u1ebdm cung c\u1ea5p m\u1ed9t l\u1edbp k\u1ebdm m\u1ecfng tr\u00ean b\u1ec1 m\u1eb7t bulong, mang l\u1ea1i kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n tuy\u1ec7t v\u1eddi. Bulong m\u1ea1 k\u1ebdm th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng trong nh\u00e0, n\u01a1i ch\u00fang kh\u00f4ng ti\u1ebfp x\u00fac v\u1edbi m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t.<\/li>\n
- M\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng: \u0110\u00e2y l\u00e0 qu\u00e1 tr\u00ecnh nh\u00fang bulong v\u00e0o b\u1ec3 k\u1ebdm n\u00f3ng ch\u1ea3y, t\u1ea1o th\u00e0nh m\u1ed9t l\u1edbp m\u1ea1 d\u00e0y, b\u1ec1n tr\u00ean b\u1ec1 m\u1eb7t bu l\u00f4ng. M\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c bu l\u00f4ng s\u1ebd ti\u1ebfp x\u00fac v\u1edbi m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t ngo\u00e0i tr\u1eddi.<\/li>\n
- L\u1edbp ph\u1ee7 oxit \u0111en: \u0110\u00e2y l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh h\u00f3a h\u1ecdc trong \u0111\u00f3 b\u1ec1 m\u1eb7t c\u1ee7a bulong \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh oxit \u0111en. L\u1edbp ph\u1ee7 oxit \u0111en cung c\u1ea5p m\u1ed9t s\u1ed1 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 c\u0169ng mang l\u1ea1i cho bulong v\u1ebb ngo\u00e0i \u0111en b\u00f3ng m\u01b0\u1ee3t.<\/li>\n
- M\u1ea1 crom: \u0110\u00e2y l\u00e0 qu\u00e1 tr\u00ecnh trong \u0111\u00f3 b\u1ec1 m\u1eb7t c\u1ee7a bulong \u0111\u01b0\u1ee3c ph\u1ee7 m\u1ed9t l\u1edbp crom. L\u1edbp m\u1ea1 crom cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n tuy\u1ec7t v\u1eddi v\u00e0 c\u0169ng mang l\u1ea1i cho bulong v\u1ebb ngo\u00e0i s\u00e1ng b\u00f3ng, ph\u1ea3n chi\u1ebfu.<\/li>\n
- <\/li>\n<\/ol>\n
\u0110\u00e2y ch\u1ec9 l\u00e0 m\u1ed9t s\u1ed1 l\u1edbp ph\u1ee7 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho bulong ISO 4014. Vi\u1ec7c l\u1ef1a ch\u1ecdn l\u1edbp ph\u1ee7 ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1 kh\u00e1c nhau, bao g\u1ed3m m\u00f4i tr\u01b0\u1eddng s\u1eed d\u1ee5ng bulong, m\u1ee9c \u0111\u1ed9 ch\u1ed1ng \u0103n m\u00f2n c\u1ea7n thi\u1ebft v\u00e0 h\u00ecnh th\u1ee9c mong mu\u1ed1n.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":" <\/p>\n ISO 4014 l\u00e0 m\u1ed9t ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c qu\u1ed1c t\u1ebf c\u00f4ng nh\u1eadn, l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c xu\u1ea5t b\u1ea3n v\u00e0o n\u0103m 1979 b\u1edfi T\u1ed5 ch\u1ee9c Ti\u00eau chu\u1ea9n h\u00f3a Qu\u1ed1c t\u1ebf (ISO). Ti\u00eau chu\u1ea9n quy \u0111\u1ecbnh c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a bu l\u00f4ng \u0111\u1ea7u l\u1ee5c gi\u00e1c c\u00f3 ren t\u1eeb M1.6 \u0111\u1ebfn M64. Bulong \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng th\u00e9p v\u00e0 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt n\u00f3i chung, n\u01a1i y\u00eau c\u1ea7u \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 tin c\u1eady cao.<\/p>\n Ti\u00eau chu\u1ea9n ISO 4014 r\u1ea5t quan tr\u1ecdng v\u00ec n\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng bulong do c\u00e1c c\u00f4ng ty kh\u00e1c nhau s\u1ea3n xu\u1ea5t c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u00e1p \u1ee9ng c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ea7n thi\u1ebft v\u1ec1 \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 tin c\u1eady. Ti\u00eau chu\u1ea9n quy \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc, dung sai, t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc v\u00e0 c\u00e1c y\u00eau c\u1ea7u \u0111\u00e1nh d\u1ea5u cho c\u00e1c bu l\u00f4ng n\u00e0y.<\/p>\n","protected":false},"featured_media":4909,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[207,211],"product_tag":[],"_links":{"self":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/product\/4908"}],"collection":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/comments?post=4908"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/media\/4909"}],"wp:attachment":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/media?parent=4908"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/product_cat?post=4908"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/product_tag?post=4908"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} | | | | |
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