{"id":4881,"date":"2025-04-26T02:26:51","date_gmt":"2025-04-26T02:26:51","guid":{"rendered":"https:\/\/nanotechvietnam.com\/?post_type=product&p=4881"},"modified":"2025-04-26T02:26:51","modified_gmt":"2025-04-26T02:26:51","slug":"bulong-din-931","status":"publish","type":"product","link":"https:\/\/nanotechvietnam.com\/en\/product\/bulong-din-931\/","title":{"rendered":"Bulong DIN 931"},"content":{"rendered":"

DIN l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a \u201cDeutsches Institut f\u00fcr Normung\u201d, t\u1ee9c \u201cVi\u1ec7n Chu\u1ea9n \u0110\u1ee9c\u201d, t\u1ed5 ch\u1ee9c ti\u00eau chu\u1ea9n h\u00f3a c\u1ee7a C\u1ed9ng h\u00f2a Li\u00ean bang \u0110\u1ee9c, \u0111\u01b0\u1ee3c th\u00e0nh l\u1eadp v\u00e0o n\u0103m 1917. L\u00e0 t\u1ed5 ch\u1ee9c ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi vi\u1ec7c ph\u00e1t tri\u1ec3n v\u00e0 duy tr\u00ec nhi\u1ec1u h\u01b0\u1edbng d\u1eabn \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn nh\u1ea5t trong n\u01b0\u1edbc v\u00e0 qu\u1ed1c t\u1ebf \u0111\u1ed1i v\u1edbi bulong, \u1ed1c v\u00edt. Trong s\u1ed1 c\u00e1c ti\u00eau chu\u1ea9n n\u00e0y, ti\u00eau chu\u1ea9n DIN 931 \u0111\u00e3 t\u1ed3n t\u1ea1i trong nhi\u1ec1u n\u0103m, v\u1edbi ngu\u1ed3n g\u1ed1c b\u1eaft ngu\u1ed3n t\u1eeb \u0111\u1ea7u th\u1ebf k\u1ef7 20. M\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a vi\u1ec7c gi\u1edbi thi\u1ec7u m\u1ed9t ti\u00eau chu\u1ea9n nh\u01b0 v\u1eady l\u00e0 t\u1ea1o ra m\u1ed9t b\u1ed9 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt nh\u1ea5t qu\u00e1n, th\u1ed1ng nh\u1ea5t v\u00e0 \u0111\u01b0\u1ee3c qu\u1ed1c t\u1ebf c\u00f4ng nh\u1eadn cho m\u1ed9t lo\u1ea1t c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p, bao g\u1ed3m \u00f4 t\u00f4, c\u01a1 kh\u00ed v\u00e0 x\u00e2y d\u1ef1ng.<\/p>\n

V\u1ec1 b\u1ea3n ch\u1ea5t, DIN 931 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t b\u1ed9 h\u01b0\u1edbng d\u1eabn d\u00e0nh cho c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t s\u1ea3n xu\u1ea5t bulong \u0111\u1ea7u l\u1ee5c gi\u00e1c c\u00f3 ren t\u1eebng ph\u1ea7n, c\u0169ng nh\u01b0 d\u00e0nh cho c\u00e1c k\u1ef9 s\u01b0 v\u00e0 chuy\u00ean gia kh\u00e1c l\u1ef1a ch\u1ecdn ho\u1eb7c ch\u1ec9 \u0111\u1ecbnh c\u00e1c bulong n\u00e0y trong thi\u1ebft k\u1ebf c\u1ee7a h\u1ecd, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c bulong tu\u00e2n theo c\u00f9ng m\u1ed9t k\u00edch th\u01b0\u1edbc nh\u1ea5t qu\u00e1n v\u00e0 ti\u00eau chu\u1ea9n ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n

DIN 931 \u0111\u1ec1 c\u1eadp c\u1ee5 th\u1ec3 \u0111\u1ebfn bulong \u0111\u1ea7u l\u1ee5c gi\u00e1c c\u00f3 th\u00e2n ch\u1ec9 \u0111\u01b0\u1ee3c ren m\u1ed9t ph\u1ea7n, h\u1ea7u h\u1ebft \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb th\u00e9p ho\u1eb7c th\u00e9p kh\u00f4ng g\u1ec9 t\u00f9y thu\u1ed9c v\u00e0o y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3. DIN 931 ph\u00e2n lo\u1ea1i bulong th\u00e0nh c\u00e1c lo\u1ea1i thu\u1ed9c t\u00ednh kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 4.6, 8.8 v\u00e0 10.9, v\u1edbi c\u00e1c s\u1ed1 cao h\u01a1n t\u01b0\u01a1ng \u1ee9ng v\u1edbi bulong c\u00f3 \u0111\u1ed9 b\u1ec1n k\u00e9o cao h\u01a1n v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc t\u1ed5ng th\u1ec3 t\u1ed1t h\u01a1n. C\u00e1c bulong n\u00e0y kh\u00e1c v\u1edbi c\u00e1c bulong \u0111\u1ea7u l\u1ee5c gi\u00e1c c\u00f3 ren ho\u00e0n to\u00e0n theo ti\u00eau chu\u1ea9n DIN 933.\u00a0Ti\u00eau chu\u1ea9n x\u00e1c \u0111\u1ecbnh c\u00e1c k\u00edch th\u01b0\u1edbc bao g\u1ed3m chi\u1ec1u d\u00e0i, \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao \u0111\u1ea7u. N\u00f3 c\u0169ng ch\u1ec9 \u0111\u1ecbnh gi\u1edbi h\u1ea1n t\u1ea3i tr\u1ecdng v\u00e0 dung sai ren \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1ee9c n\u0103ng ph\u00f9 h\u1ee3p c\u1ee7a v\u00edt trong c\u00e1c v\u1eadt li\u1ec7u v\u00e0 \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/p>\n

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\u1ee8ng d\u1ee5ng<\/h3>\n

Bulong \u0111\u1ea7u l\u1ee5c gi\u00e1c \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh trong DIN 931 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u01a1 kh\u00ed v\u00e0 k\u1ef9 thu\u1eadt \u0111\u1ec3 thay th\u1ebf tr\u1ef1c ti\u1ebfp cho c\u00e1c ph\u1ee5 ki\u1ec7n c\u0169 ho\u1eb7c b\u1ecb h\u1ecfng. Ph\u1ea7n ren c\u1ee7a bulong cho ph\u00e9p d\u1ec5 d\u00e0ng c\u00e0i \u0111\u1eb7t v\u00e0 g\u1ee1 b\u1ecf khi c\u1ea7n thi\u1ebft. Ti\u00eau chu\u1ea9n DIN 931 \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn v\u00e0 s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nhau bao g\u1ed3m \u00f4 t\u00f4, x\u00e2y d\u1ef1ng v\u00e0 s\u1ea3n xu\u1ea5t..<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt DIN 931<\/h3>\n
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K\u00edch th\u01b0\u1edbc<\/h3>\n

\"\"<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Nominal Size
\nand Pitch<\/th>\n		Width Across Flat, s<\/th>\nWidth Across Corner, e<\/th>\nHead Thickness, k<\/th>\nMinimum Fillet
\nRadius, r<\/th>\n		Thread Length, l<\/th>\n<\/tr>\n
Min.<\/th>\nMax.<\/th>\nMin.<\/th>\nGrade A<\/th>\nGrade B<\/th>\n<\/tr>\n
Grade A<\/th>\nGrade B<\/th>\nGrade A<\/th>\nGrade B<\/th>\nMin.<\/th>\nMax.<\/th>\nMin.<\/th>\nMax.<\/th>\nL \u2264 125<\/th>\n125 < L \u2264 200<\/th>\nL > 200<\/th>\n<\/tr>\n<\/thead>\n
M5 x 0.8<\/td>\n7.78<\/td>\n\u2013<\/td>\n8<\/td>\n8.79<\/td>\n\u2013<\/td>\n3.35<\/td>\n3.65<\/td>\n\u2013<\/td>\n\u2013<\/td>\n0.2<\/td>\n16<\/td>\n22<\/td>\n\u2013<\/td>\n<\/tr>\n
M6 x 1<\/td>\n9.78<\/td>\n\u2013<\/td>\n10<\/td>\n11.05<\/td>\n\u2013<\/td>\n3.85<\/td>\n4.15<\/td>\n\u2013<\/td>\n\u2013<\/td>\n0.25<\/td>\n18<\/td>\n24<\/td>\n\u2013<\/td>\n<\/tr>\n
M8 x 1.25<\/td>\n12.73<\/td>\n\u2013<\/td>\n13<\/td>\n14.38<\/td>\n\u2013<\/td>\n5.15<\/td>\n5.45<\/td>\n\u2013<\/td>\n\u2013<\/td>\n0.4<\/td>\n22<\/td>\n28<\/td>\n\u2013<\/td>\n<\/tr>\n
M10 x 1.5<\/td>\n16.73<\/td>\n\u2013<\/td>\n17<\/td>\n18.9<\/td>\n\u2013<\/td>\n6.22<\/td>\n6.58<\/td>\n\u2013<\/td>\n\u2013<\/td>\n0.4<\/td>\n26<\/td>\n32<\/td>\n45<\/td>\n<\/tr>\n
M12 x 1.75<\/td>\n18.67<\/td>\n\u2013<\/td>\n19<\/td>\n21.1<\/td>\n\u2013<\/td>\n7.32<\/td>\n7.68<\/td>\n\u2013<\/td>\n\u2013<\/td>\n0.6<\/td>\n30<\/td>\n36<\/td>\n49<\/td>\n<\/tr>\n
M16 x 2<\/td>\n23.67<\/td>\n23.16<\/td>\n24<\/td>\n26.75<\/td>\n26.17<\/td>\n9.82<\/td>\n10.18<\/td>\n9.71<\/td>\n10.29<\/td>\n0.6<\/td>\n38<\/td>\n44<\/td>\n57<\/td>\n<\/tr>\n
M20 x 2.5<\/td>\n29.67<\/td>\n29.16<\/td>\n30<\/td>\n33.53<\/td>\n32.95<\/td>\n12.28<\/td>\n12.72<\/td>\n12.15<\/td>\n12.85<\/td>\n0.8<\/td>\n46<\/td>\n52<\/td>\n65<\/td>\n<\/tr>\n
M24 x 3<\/td>\n35.38<\/td>\n35<\/td>\n36<\/td>\n39.98<\/td>\n39.55<\/td>\n14.78<\/td>\n15.22<\/td>\n14.65<\/td>\n15.35<\/td>\n0.8<\/td>\n54<\/td>\n60<\/td>\n73<\/td>\n<\/tr>\n
M30 x 3.5<\/td>\n\u2013<\/td>\n45<\/td>\n46<\/td>\n\u2013<\/td>\n50.85<\/td>\n\u2013<\/td>\n\u2013<\/td>\n18.28<\/td>\n19.12<\/td>\n1.0<\/td>\n66<\/td>\n72<\/td>\n85<\/td>\n<\/tr>\n
M36 x 4<\/td>\n\u2013<\/td>\n53.80<\/td>\n55<\/td>\n\u2013<\/td>\n60.79<\/td>\n\u2013<\/td>\n\u2013<\/td>\n22.08<\/td>\n22.92<\/td>\n1.0<\/td>\n78<\/td>\n84<\/td>\n97<\/td>\n<\/tr>\n
M39 x 4<\/td>\n\u2013<\/td>\n60<\/td>\n65<\/td>\n\u2013<\/td>\n66.44<\/td>\n\u2013<\/td>\n\u2013<\/td>\n24.58<\/td>\n25.42<\/td>\n1.0<\/td>\n84<\/td>\n90<\/td>\n103<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

H\u00f3a h\u1ecdc<\/h3>\n

Th\u00f4ng s\u1ed1 h\u00f3a h\u1ecdc c\u1ee7a ti\u00eau chu\u1ea9n DIN 931 c\u0169ng ch\u00ednh l\u00e0 th\u00f4ng s\u1ed1 h\u00f3a h\u1ecdc c\u1ee7a ti\u00eau chu\u1ea9n ISO 898-1.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Property Class<\/th>\nMaterial and heat treatment<\/th>\nChemical Composition Limit
\n(cast analysis, %)<\/th>\n		Tempering
\nTemp, \u00baC, min<\/th>\n<\/tr>\n
C<\/th>\nP, max<\/th>\nS, max<\/th>\nB, max<\/th>\n<\/tr>\n<\/thead>\n
4.6<\/td>\nCarbon steel or carbon steel with additives<\/td>\n0.55 max<\/td>\n0.05<\/td>\n0.06<\/td>\nNot specified<\/td>\n\u2013<\/td>\n<\/tr>\n
4.8<\/td>\n<\/tr>\n
5.6<\/td>\n0.13 \u2013 0.55<\/td>\n<\/tr>\n
5.8<\/td>\n0.55 max<\/td>\n<\/tr>\n
6.8<\/td>\n0.15 \u2013 0.55<\/td>\n<\/tr>\n
8.8<\/td>\nCarbon steel with additives (e.g. Boron or Mn or Cr)
\nquenched and tempered<\/td>\n		0.15 \u2013 0.40<\/td>\n0.025<\/td>\n0.025<\/td>\n0.003<\/td>\n425<\/td>\n<\/tr>\n
Carbon steel quenched and tempered<\/td>\n0.25 \u2013 0.55<\/td>\n<\/tr>\n
Alloy steel quenched and tempered<\/td>\n0.20 \u2013 0.55<\/td>\n<\/tr>\n
9.8<\/td>\nCarbon steel with additives (e.g. Boron or Mn or Cr)
\nquenched and tempered<\/td>\n		0.15 \u2013 0.40<\/td>\n0.025<\/td>\n0.025<\/td>\n0.003<\/td>\n425<\/td>\n<\/tr>\n
Carbon steel quenched and tempered<\/td>\n0.25 \u2013 0.55<\/td>\n<\/tr>\n
Alloy steel quenched and tempered<\/td>\n0.20 \u2013 0.55<\/td>\n<\/tr>\n
10.9<\/td>\nCarbon steel with additives (e.g. Boron or Mn or Cr)
\nquenched and tempered<\/td>\n		0.20 \u2013 0.55<\/td>\n0.025<\/td>\n0.025<\/td>\n0.003<\/td>\n425<\/td>\n<\/tr>\n
Carbon steel quenched and tempered<\/td>\n0.25 \u2013 0.55<\/td>\n<\/tr>\n
Alloy steel quenched and tempered<\/td>\n0.20 \u2013 0.55<\/td>\n<\/tr>\n
12.9<\/td>\nAlloy steel quenched and tempered<\/td>\n0.30 \u2013 0.50<\/td>\n0.025<\/td>\n0.025<\/td>\n0.003<\/td>\n425<\/td>\n<\/tr>\n
12.9<\/td>\nCarbon steel with additives (e.g. Boron or Mn or Cr
\nor Molybdenum) quenched and tempered<\/td>\n		0.28 \u2013 0.50<\/td>\n0.025<\/td>\n0.025<\/td>\n0.003<\/td>\n380<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u01a1 t\u00ednh<\/h3>\n

C\u0169ng nh\u01b0 th\u00f4ng s\u1ed1 h\u00f3a h\u1ecdc, th\u00f4ng s\u1ed1 c\u01a1 t\u00ednh c\u1ee7a ti\u00eau chu\u1ea9n DIN 931 c\u0169ng ch\u00ednh l\u00e0 th\u00f4ng s\u1ed1 c\u01a1 t\u00ednh c\u1ee7a ti\u00eau chu\u1ea9n ISO 898-1.<\/p>\n

B\u1ea3ng 1: Mechanical Property<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Mechanical Property<\/th>\nProperty Class<\/th>\n<\/tr>\n
4.6<\/th>\n4.8<\/th>\n5.6<\/th>\n5.8<\/th>\n6.8<\/th>\n8.8<\/th>\n9.8
\nM16 and under<\/th>\n		10.9<\/th>\n12.9\/
\n12.9<\/th>\n<\/tr>\n
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M16 and<\/span><\/p>\n

under<\/span><\/p>\n<\/th>\n

Over M16<\/th>\n<\/tr>\n<\/thead>\n
Tensile strength, Rm, MPa<\/td>\nnom.<\/td>\n400<\/td>\n500<\/td>\n600<\/td>\n800<\/td>\n900<\/td>\n1000<\/td>\n1200<\/td>\n<\/tr>\n
min.<\/td>\n400<\/td>\n420<\/td>\n500<\/td>\n520<\/td>\n600<\/td>\n800<\/td>\n830<\/td>\n900<\/td>\n1040<\/td>\n1220<\/td>\n<\/tr>\n
Lower yield strength, ReL, MPa<\/td>\nnom.<\/td>\n240<\/td>\n\u2014<\/td>\n300<\/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
min.<\/td>\n240<\/td>\n\u2014<\/td>\n300<\/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
Stress 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>\n640<\/td>\n640<\/td>\n720<\/td>\n900<\/td>\n1080<\/td>\n<\/tr>\n
min.<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n640<\/td>\n660<\/td>\n720<\/td>\n940<\/td>\n1100<\/td>\n<\/tr>\n
Stress at 0,0048 d non-proportional
\nelongation for full-size fasteners, Rpf, MPa<\/td>\n		nom.<\/td>\n\u2014<\/td>\n320<\/td>\n\u2014<\/td>\n400<\/td>\n480<\/td>\n\u2014<\/td>\n<\/tr>\n
min.<\/td>\n\u2014<\/td>\n340<\/td>\n\u2014<\/td>\n420<\/td>\n480<\/td>\n\u2014<\/td>\n<\/tr>\n
Stress under proof load, Sp, MPa<\/td>\nnom.<\/td>\n225<\/td>\n310<\/td>\n280<\/td>\n380<\/td>\n440<\/td>\n440<\/td>\n600<\/td>\n650<\/td>\n830<\/td>\n970<\/td>\n<\/tr>\n
Proof strength ratio<\/td>\nSp,nom\/ReL min
\nSp,nom\/Rp0,2 min
\nSp,nom\/Rpf min<\/td>\n		0,94<\/td>\n0,91<\/td>\n0,93<\/td>\n0,90<\/td>\n0,92<\/td>\n0,91<\/td>\n0,91<\/td>\n0,90<\/td>\n0,88<\/td>\n0,88<\/td>\n<\/tr>\n
Percentage elongation after fracture for
\nmachined test pieces, A, %<\/td>\n		min.<\/td>\n22<\/td>\n\u2014<\/td>\n20<\/td>\n\u2014<\/td>\n\u2014<\/td>\n12<\/td>\n12<\/td>\n10<\/td>\n9<\/td>\n8<\/td>\n<\/tr>\n
Percentage reduction of area after fracture for
\nmachined test pieces, Z, %<\/td>\n		min.<\/td>\n\u2014<\/td>\n52<\/td>\n48<\/td>\n48<\/td>\n44<\/td>\n<\/tr>\n
Elongation after fracture for full-size
\nfasteners, Af<\/td>\n		min.<\/td>\n\u2014<\/td>\n0,24<\/td>\n\u2014<\/td>\n0,22<\/td>\n0,20<\/td>\n\u2014<\/td>\n<\/tr>\n
Head soundness<\/td>\nNo fracture<\/td>\n<\/tr>\n
Vickers hardness,
\nHV F \u2265 98 N<\/td>\n		min.<\/td>\n120<\/td>\n130<\/td>\n155<\/td>\n160<\/td>\n190<\/td>\n250<\/td>\n255<\/td>\n290<\/td>\n320<\/td>\n385<\/td>\n<\/tr>\n
max.<\/td>\n220<\/td>\n250<\/td>\n320<\/td>\n335<\/td>\n360<\/td>\n380<\/td>\n435<\/td>\n<\/tr>\n
Brinell hardness, HBW
\nF = 30 D2<\/td>\n		min.<\/td>\n114<\/td>\n124<\/td>\n147<\/td>\n152<\/td>\n181<\/td>\n238<\/td>\n242<\/td>\n276<\/td>\n304<\/td>\n304<\/td>\n<\/tr>\n
max.<\/td>\n209<\/td>\n238<\/td>\n304<\/td>\n318<\/td>\n342<\/td>\n361<\/td>\n414<\/td>\n<\/tr>\n
Rockwell hardness, HRB<\/td>\nmin.<\/td>\n67<\/td>\n71<\/td>\n79<\/td>\n82<\/td>\n89<\/td>\n\u2014<\/td>\n<\/tr>\n
max.<\/td>\n95,0<\/td>\n89<\/td>\n\u2014<\/td>\n<\/tr>\n
Rockwell hardness, HRC<\/td>\nmin.<\/td>\n\u2014<\/td>\n22<\/td>\n23<\/td>\n23<\/td>\n32<\/td>\n39<\/td>\n<\/tr>\n
max.<\/td>\n\u2014<\/td>\n32<\/td>\n34<\/td>\n37<\/td>\n39<\/td>\n44<\/td>\n<\/tr>\n
Surface hardness, HV 0,3<\/td>\nmax.<\/td>\n\u2014<\/td>\n(1)<\/td>\n(1),(2)<\/td>\n(1).(3)<\/td>\n<\/tr>\n
Height of non-decarburized thread zone,
\nE, mm<\/td>\n		min.<\/td>\n\u2014<\/td>\n1\/2 H1<\/td>\n2\/3 H1<\/td>\n3\/4 H1<\/td>\n<\/tr>\n
Depth of complete decarburization
\nin the thread, G, mm<\/td>\n		max.<\/td>\n\u2014<\/td>\n0,015<\/td>\n<\/tr>\n
Reduction of hardness after retempering, HV<\/td>\nmax.<\/td>\n\u2014<\/td>\n20<\/td>\n<\/tr>\n
Breaking torque, MB, N\u22c5m<\/td>\nmin.<\/td>\n\u2014<\/td>\nin accordance with ISO 898-7<\/td>\n<\/tr>\n
Impact strength, KV, J<\/td>\nmin.<\/td>\n\u2014<\/td>\n27<\/td>\n\u2014<\/td>\n27<\/td>\n(4)<\/td>\n<\/tr>\n
Surface integrity in accordance with<\/td>\nISO 6157-1<\/td>\nISO 6157-3<\/td>\n<\/tr>\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>\n

B\u1ea3ng 2: Proof load<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Thread
\nd<\/th>\n		Nominal stress area
\nAs, nom, mm2<\/th>\n		Property class<\/th>\n<\/tr>\n
4.6<\/th>\n4.8<\/th>\n5.6<\/th>\n5.8<\/th>\n6.8<\/th>\n8.8<\/th>\n9.8<\/th>\n9.8<\/th>\n12.9\/12.9<\/th>\n<\/tr>\n
Proof load, Fp (As,nom \u00d7 Sp,nom), N<\/th>\n<\/tr>\n<\/thead>\n
M12<\/td>\n84,3<\/td>\n19 000<\/td>\n26 100<\/td>\n23 600<\/td>\n32 000<\/td>\n37 100<\/td>\n48 900<\/td>\n54 800<\/td>\n70 000<\/td>\n81 800<\/td>\n<\/tr>\n
M16<\/td>\n157<\/td>\n35 300<\/td>\n48 700<\/td>\n44 000<\/td>\n59 700<\/td>\n69 100<\/td>\n91 000<\/td>\n102 000<\/td>\n130 000<\/td>\n152 000<\/td>\n<\/tr>\n
M20<\/td>\n245<\/td>\n55 100<\/td>\n76 000<\/td>\n68 600<\/td>\n93 100<\/td>\n108 000<\/td>\n147 000<\/td>\n\u2014<\/td>\n203 000<\/td>\n238 000<\/td>\n<\/tr>\n
M22<\/td>\n303<\/td>\n68 200<\/td>\n93 900<\/td>\n84 800<\/td>\n115 000<\/td>\n133 000<\/td>\n182 000<\/td>\n\u2014<\/td>\n252 000<\/td>\n294 000<\/td>\n<\/tr>\n
M24<\/td>\n353<\/td>\n79 400<\/td>\n109 000<\/td>\n98 800<\/td>\n134 000<\/td>\n155 000<\/td>\n212 000<\/td>\n\u2014<\/td>\n293 000<\/td>\n342 000<\/td>\n<\/tr>\n
M27<\/td>\n459<\/td>\n103 000<\/td>\n142 000<\/td>\n128 000<\/td>\n174 000<\/td>\n202 000<\/td>\n275 000<\/td>\n\u2014<\/td>\n381 000<\/td>\n445 000<\/td>\n<\/tr>\n
M30<\/td>\n561<\/td>\n126 000<\/td>\n174 000<\/td>\n157 000<\/td>\n213 000<\/td>\n247 000<\/td>\n337 000<\/td>\n\u2014<\/td>\n466 000<\/td>\n544 000<\/td>\n<\/tr>\n
M33<\/td>\n694<\/td>\n156 000<\/td>\n215 000<\/td>\n194 000<\/td>\n264 000<\/td>\n305 000<\/td>\n416 000<\/td>\n\u2014<\/td>\n576 000<\/td>\n673 000<\/td>\n<\/tr>\n
M36<\/td>\n817<\/td>\n184 000<\/td>\n253 000<\/td>\n229 000<\/td>\n310 000<\/td>\n359 000<\/td>\n490 000<\/td>\n\u2014<\/td>\n678 000<\/td>\n792 000<\/td>\n<\/tr>\n
M39<\/td>\n976<\/td>\n220 000<\/td>\n303 000<\/td>\n273 000<\/td>\n371 000<\/td>\n429 000<\/td>\n586 000<\/td>\n\u2014<\/td>\n810 000<\/td>\n947 000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

B\u1ea3ng 3: Tensile load<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Thread
\nd<\/th>\n		Nominal stress area
\nAs, nom, mm2<\/th>\n		Property class<\/th>\n<\/tr>\n
4.6<\/th>\n4.8<\/th>\n5.6<\/th>\n5.8<\/th>\n6.8<\/th>\n8.8<\/th>\n9.8<\/th>\n9.8<\/th>\n12.9\/12.9<\/th>\n<\/tr>\n
Minimum ultimate tensile load, Fm min (As, nom \u00d7 Rm, min), N<\/th>\n<\/tr>\n<\/thead>\n
M12<\/td>\n84,3<\/td>\n33 700<\/td>\n35 400<\/td>\n42 200<\/td>\n43 800<\/td>\n50 600<\/td>\n67 400<\/td>\n75 900<\/td>\n87 700<\/td>\n103 000<\/td>\n<\/tr>\n
M16<\/td>\n157<\/td>\n62 800<\/td>\n65 900<\/td>\n78 500<\/td>\n81 600<\/td>\n94 000<\/td>\n125 000<\/td>\n141 000<\/td>\n163 000<\/td>\n192 000<\/td>\n<\/tr>\n
M20<\/td>\n245<\/td>\n98 000<\/td>\n103 000<\/td>\n122 000<\/td>\n127 000<\/td>\n147 000<\/td>\n203 000<\/td>\n\u2014<\/td>\n255 000<\/td>\n299 000<\/td>\n<\/tr>\n
M22<\/td>\n303<\/td>\n121 000<\/td>\n127 000<\/td>\n152 000<\/td>\n158 000<\/td>\n182 000<\/td>\n252 000<\/td>\n\u2014<\/td>\n315 000<\/td>\n370 000<\/td>\n<\/tr>\n
M24<\/td>\n353<\/td>\n141 000<\/td>\n148 000<\/td>\n176 000<\/td>\n184 000<\/td>\n212 000<\/td>\n293 000<\/td>\n\u2014<\/td>\n367 000<\/td>\n431 000<\/td>\n<\/tr>\n
M27<\/td>\n459<\/td>\n184 000<\/td>\n193 000<\/td>\n230 000<\/td>\n239 000<\/td>\n275 000<\/td>\n381 000<\/td>\n\u2014<\/td>\n477 000<\/td>\n560 000<\/td>\n<\/tr>\n
M30<\/td>\n561<\/td>\n224 000<\/td>\n236 000<\/td>\n280 000<\/td>\n292 000<\/td>\n337 000<\/td>\n466 000<\/td>\n\u2014<\/td>\n583 000<\/td>\n684 000<\/td>\n<\/tr>\n
M33<\/td>\n694<\/td>\n278 000<\/td>\n292 000<\/td>\n347 000<\/td>\n361 000<\/td>\n416 000<\/td>\n576 000<\/td>\n\u2014<\/td>\n722 000<\/td>\n847 000<\/td>\n<\/tr>\n
M36<\/td>\n817<\/td>\n327 000<\/td>\n343 000<\/td>\n408 000<\/td>\n425 000<\/td>\n490 000<\/td>\n678 000<\/td>\n\u2014<\/td>\n850 000<\/td>\n997 000<\/td>\n<\/tr>\n
M39<\/td>\n976<\/td>\n390 000<\/td>\n410 000<\/td>\n488 000<\/td>\n508 000<\/td>\n586 000<\/td>\n810 000<\/td>\n\u2014<\/td>\n1 020 000<\/td>\n1 200 000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

L\u1edbp m\u1ea1<\/h2>\n
\n
\n
\n

Khi n\u00f3i \u0111\u1ebfn c\u00e1c l\u1edbp ph\u1ee7 cho bulong DIN 931, c\u00f3 m\u1ed9t s\u1ed1 t\u00f9y ch\u1ecdn c\u00f3 s\u1eb5n t\u00f9y thu\u1ed9c v\u00e0o m\u00f4i tr\u01b0\u1eddng m\u00e0 ch\u00fang s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. V\u00ed d\u1ee5, m\u1ea1 k\u1ebdm ho\u1eb7c m\u1ea1 \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n trong m\u00f4i tr\u01b0\u1eddng ngo\u00e0i tr\u1eddi ho\u1eb7c \u0111\u1ed9 \u1ea9m cao. Ngo\u00e0i ra, l\u1edbp ph\u1ee7 oxit \u0111en ho\u1eb7c th\u1ee5 \u0111\u1ed9ng h\u00f3a c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 mang l\u1ea1i v\u1ebb ngo\u00e0i th\u1ea9m m\u1ef9 h\u01a1n. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 ch\u1ecdn l\u1edbp ph\u1ee7 ch\u00ednh x\u00e1c d\u1ef1a tr\u00ean c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 v\u1eadt li\u1ec7u c\u1ee7a bulong, nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m c\u1ee7a m\u00f4i tr\u01b0\u1eddng c\u0169ng nh\u01b0 c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng kh\u00e1c m\u00e0 bulong c\u00f3 th\u1ec3 ti\u1ebfp x\u00fac theo th\u1eddi gian. Cu\u1ed1i c\u00f9ng, vi\u1ec7c ch\u1ecdn l\u1edbp ph\u1ee7 ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng bulong b\u1ec1n v\u00e0 \u0111\u00e1ng tin c\u1eady cho m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"

DIN l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a \u201cDeutsches Institut f\u00fcr Normung\u201d, t\u1ee9c \u201cVi\u1ec7n Chu\u1ea9n \u0110\u1ee9c\u201d, t\u1ed5 ch\u1ee9c ti\u00eau chu\u1ea9n h\u00f3a c\u1ee7a C\u1ed9ng h\u00f2a Li\u00ean bang \u0110\u1ee9c, \u0111\u01b0\u1ee3c th\u00e0nh l\u1eadp v\u00e0o n\u0103m 1917. L\u00e0 t\u1ed5 ch\u1ee9c ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi vi\u1ec7c ph\u00e1t tri\u1ec3n v\u00e0 duy tr\u00ec nhi\u1ec1u h\u01b0\u1edbng d\u1eabn \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn nh\u1ea5t trong n\u01b0\u1edbc v\u00e0 qu\u1ed1c t\u1ebf \u0111\u1ed1i v\u1edbi bulong, \u1ed1c v\u00edt. Trong s\u1ed1 c\u00e1c ti\u00eau chu\u1ea9n n\u00e0y, ti\u00eau chu\u1ea9n DIN 931 \u0111\u00e3 t\u1ed3n t\u1ea1i trong nhi\u1ec1u n\u0103m, v\u1edbi ngu\u1ed3n g\u1ed1c b\u1eaft ngu\u1ed3n t\u1eeb \u0111\u1ea7u th\u1ebf k\u1ef7 20. M\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a vi\u1ec7c gi\u1edbi thi\u1ec7u m\u1ed9t ti\u00eau chu\u1ea9n nh\u01b0 v\u1eady l\u00e0 t\u1ea1o ra m\u1ed9t b\u1ed9 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt nh\u1ea5t qu\u00e1n, th\u1ed1ng nh\u1ea5t v\u00e0 \u0111\u01b0\u1ee3c qu\u1ed1c t\u1ebf c\u00f4ng nh\u1eadn cho m\u1ed9t lo\u1ea1t c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p, bao g\u1ed3m \u00f4 t\u00f4, c\u01a1 kh\u00ed v\u00e0 x\u00e2y d\u1ef1ng.<\/p>\n","protected":false},"featured_media":4884,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[207,210],"product_tag":[],"_links":{"self":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/product\/4881"}],"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=4881"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/media\/4884"}],"wp:attachment":[{"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/media?parent=4881"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/product_cat?post=4881"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/nanotechvietnam.com\/en\/wp-json\/wp\/v2\/product_tag?post=4881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}