{"id":5728,"date":"2026-09-18T10:00:06","date_gmt":"2026-09-18T01:00:06","guid":{"rendered":"https:\/\/ohtavn.com\/?post_type=media&p=5728"},"modified":"2026-09-09T13:03:03","modified_gmt":"2026-09-09T04:03:03","slug":"complete-comparison-of-metric-and-inch-threads","status":"publish","type":"media","link":"https:\/\/ohtavn.com\/vi\/media\/complete-comparison-of-metric-and-inch-threads\/","title":{"rendered":"So s\u00e1nh chi ti\u1ebft ren h\u1ec7 m\u00e9t v\u00e0 ren h\u1ec7 inch: H\u01b0\u1edbng d\u1eabn th\u1ef1c t\u1ebf v\u1ec1 mua h\u00e0ng v\u00e0 thi\u1ebft k\u1ebf d\u00e0nh cho ng\u00e0nh s\u1ea3n xu\u1ea5t"},"content":{"rendered":"
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L\u1eddi m\u1edf \u0111\u1ea7u<\/h3>\n<\/div>\n
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Trong l\u0129nh v\u1ef1c s\u1ea3n xu\u1ea5t, “\u1ed1c v\u00edt” hay “bu l\u00f4ng” l\u00e0 nh\u1eefng linh ki\u1ec7n c\u01a1 b\u1ea3n v\u00e0 quan tr\u1ecdng nh\u1ea5t, \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady c\u1ee7a s\u1ea3n ph\u1ea9m. Tuy nhi\u00ean, t\u1ea1i c\u00e1c hi\u1ec7n tr\u01b0\u1eddng thi\u1ebft k\u1ebf v\u00e0 thu mua, vi\u1ec7c nh\u1ea7m l\u1eabn gi\u1eefa “h\u1ec7 m\u00e9t” (ti\u00eau chu\u1ea9n to\u00e0n c\u1ea7u) v\u00e0 “h\u1ec7 inch” (v\u1eabn \u0111\u01b0\u1ee3c d\u00f9ng ph\u1ed5 bi\u1ebfn trong ng\u00e0nh h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, thi\u1ebft b\u1ecb th\u1ee7y l\u1ef1c v\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m cho th\u1ecb tr\u01b0\u1eddng M\u1ef9) \u0111\u00f4i khi g\u00e2y ra nh\u1eefng r\u1eafc r\u1ed1i nghi\u00eam tr\u1ecdng. \u0110\u1eb7c bi\u1ec7t t\u1ea1i Vi\u1ec7t Nam, n\u01a1i \u0111ang \u0111\u01b0\u1ee3c ch\u00fa \u00fd nh\u01b0 m\u1ed9t c\u0103n c\u1ee9 s\u1ea3n xu\u1ea5t h\u1ea3i ngo\u1ea1i, s\u1ef1 \u0111an xen gi\u1eefa c\u00e1c ti\u00eau chu\u1ea9n Nh\u1eadt B\u1ea3n, \u00c2u M\u1ef9 v\u00e0 ti\u00eau chu\u1ea9n \u0111\u1ecba ph\u01b0\u01a1ng khi\u1ebfn vi\u1ec7c ph\u00e2n bi\u1ec7t d\u1ef1a tr\u00ean ki\u1ebfn th\u1ee9c ch\u00ednh x\u00e1c tr\u1edf n\u00ean thi\u1ebft y\u1ebfu.<\/p>\n

Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd gi\u1ea3i th\u00edch c\u1eb7n k\u1ebd t\u1eeb s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ea5u tr\u00fac gi\u1eefa ren h\u1ec7 m\u00e9t v\u00e0 h\u1ec7 inch \u0111\u1ebfn c\u00e1c ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf (ISO, UN…), c\u0169ng nh\u01b0 k\u1ef9 thu\u1eadt qu\u1ea3n l\u00fd ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 thu mua “Kh\u00f4ng sai s\u00f3t” (Zero-mistake) m\u00e0 Ohta Vi\u1ec7t Nam \u0111\u1ec1 xu\u1ea5t. Th\u00f4ng qua b\u00e0i vi\u1ebft, qu\u00fd \u0111\u1ed9c gi\u1ea3 s\u1ebd n\u1eafm v\u1eefng ph\u01b0\u01a1ng ph\u00e1p c\u1ee5 th\u1ec3 \u0111\u1ec3 tr\u00e1nh l\u1ed7i ch\u1ecdn sai linh ki\u1ec7n li\u00ean k\u1ebft, \u0111\u1ed3ng th\u1eddi t\u1ed1i \u01b0u h\u00f3a chi ph\u00ed v\u00e0 n\u00e2ng cao ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n<\/div>\n

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Ren h\u1ec7 m\u00e9t v\u00e0 ren h\u1ec7 inch: S\u1ef1 kh\u00e1c bi\u1ec7t quy\u1ebft \u0111\u1ecbnh v\u1ec1 c\u1ea5u tr\u00fac v\u00e0 ti\u00eau chu\u1ea9n<\/h3>\n<\/div>\n
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\u0110\u1ecbnh ngh\u0129a v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a ren h\u1ec7 m\u00e9t (Ren M)<\/h4>\n<\/div>\n
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Ren h\u1ec7 m\u00e9t l\u00e0 ti\u00eau chu\u1ea9n ren ph\u1ed5 bi\u1ebfn nh\u1ea5t th\u1ebf gi\u1edbi, \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh b\u1edfi ISO (T\u1ed5 ch\u1ee9c Ti\u00eau chu\u1ea9n h\u00f3a Qu\u1ed1c t\u1ebf). \u0110\u01b0\u1eddng k\u00ednh danh ngh\u0129a (\u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i) v\u00e0 b\u01b0\u1edbc ren (kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c \u0111\u1ec9nh ren) \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u b\u1eb1ng \u0111\u01a1n v\u1ecb milimet (mm). V\u00ed d\u1ee5, “M8\u00d71.25” c\u00f3 ngh\u0129a l\u00e0 \u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i 8mm v\u00e0 b\u01b0\u1edbc ren 1.25mm. G\u00f3c \u0111\u1ec9nh ren \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh l\u00e0 60\u00b0, v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m l\u00e0 d\u1ec5 t\u00ednh to\u00e1n v\u00e0 t\u00ednh v\u1ea1n n\u0103ng cao. C\u00e1c ti\u00eau chu\u1ea9n trong ng\u00e0nh s\u1ea3n xu\u1ea5t c\u1ee7a Nh\u1eadt B\u1ea3n c\u0169ng tu\u00e2n th\u1ee7 h\u1ec7 m\u00e9t n\u00e0y, mang l\u1ea1i l\u1ee3i th\u1ebf trong vi\u1ec7c \u0111\u1ed3ng b\u1ed9 h\u00f3a linh ki\u1ec7n v\u00e0 gi\u1ea3m gi\u00e1 th\u00e0nh.<\/p>\n<\/div>\n

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H\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p c\u1ee7a ren h\u1ec7 inch (Ren Unified v\u00e0 ren Whitworth)<\/h4>\n<\/div>\n
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M\u1eb7t kh\u00e1c, ren h\u1ec7 inch l\u00e0 ti\u00eau chu\u1ea9n d\u1ef1a tr\u00ean \u0111\u01a1n v\u1ecb 1 inch (25.4mm). Hi\u1ec7n nay, d\u00f2ng ch\u1ee7 l\u01b0u l\u00e0 “Ren Unified” (Ren Th\u1ed1ng nh\u1ea5t) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng chung t\u1ea1i M\u1ef9, Canada v\u00e0 Anh. Ren Unified bao g\u1ed3m ren b\u01b0\u1edbc th\u00f4 UNC (Unified Coarse) v\u00e0 ren b\u01b0\u1edbc m\u1ecbn UNF (Unified Fine). M\u1eb7c d\u00f9 g\u00f3c \u0111\u1ec9nh ren l\u00e0 60\u00b0 gi\u1ed1ng nh\u01b0 h\u1ec7 m\u00e9t, nh\u01b0ng k\u00fd hi\u1ec7u k\u00edch th\u01b0\u1edbc l\u1ea1i theo d\u1ea1ng “1\/4-20” (\u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i 1\/4 inch v\u00e0 c\u00f3 20 ren tr\u00ean m\u1ed7i inch chi\u1ec1u d\u00e0i). Ngo\u00e0i ra, \u1edf c\u00e1c thi\u1ebft b\u1ecb c\u0169 ho\u1eb7c v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng, \u0111\u00f4i khi v\u1eabn c\u00f2n t\u1ed3n t\u1ea1i “Ren Whitworth” v\u1edbi g\u00f3c \u0111\u1ec9nh ren 55\u00b0. Vi\u1ec7c nh\u1ea7m l\u1eabn c\u00e1c lo\u1ea1i n\u00e0y kh\u00f4ng ch\u1ec9 khi\u1ebfn vi\u1ec7c l\u1eafp si\u1ebft kh\u00f4ng kh\u1ea3 thi v\u1ec1 m\u1eb7t v\u1eadt l\u00fd m\u00e0 c\u00f2n g\u00e2y r\u1ee7i ro h\u01b0 h\u1ecfng b\u1ed9 ph\u1eadn do c\u1ed1 t\u00ecnh si\u1ebft ch\u1eb7t.<\/p>\n<\/div>\n

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B\u1ed1i c\u1ea3nh vi\u1ec7c l\u1ef1a ch\u1ecdn ti\u00eau chu\u1ea9n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn tu\u1ed5i th\u1ecd s\u1ea3n ph\u1ea9m v\u00e0 chi ph\u00ed<\/h3>\n<\/div>\n
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Nhi\u1ec1u doanh nghi\u1ec7p Nh\u1eadt B\u1ea3n s\u1eed d\u1ee5ng h\u1ec7 m\u00e9t l\u00e0m ti\u00eau chu\u1ea9n, nh\u01b0ng \u0111\u1ed1i v\u1edbi c\u00e1c s\u1ea3n ph\u1ea9m xu\u1ea5t kh\u1ea9u sang B\u1eafc M\u1ef9, m\u00e1y m\u00f3c x\u00e2y d\u1ef1ng, linh ki\u1ec7n h\u00e0ng kh\u00f4ng, ho\u1eb7c b\u1ea3o tr\u00ec c\u00e1c thi\u1ebft b\u1ecb c\u0169 h\u1ec7 Anh, vi\u1ec7c \u00e1p d\u1ee5ng ren h\u1ec7 inch l\u00e0 b\u1eaft bu\u1ed9c. \u0110i\u1ec1u quan tr\u1ecdng \u1edf \u0111\u00e2y kh\u00f4ng ch\u1ec9 l\u00e0 kh\u1edbp k\u00edch th\u01b0\u1edbc, m\u00e0 c\u00f2n ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c ti\u00eau chu\u1ea9n v\u1ec1 “C\u1ea5p \u0111\u1ed9 b\u1ec1n” v\u00e0 “X\u1eed l\u00fd b\u1ec1 m\u1eb7t” c\u1ee7a t\u1eebng lo\u1ea1i ren. V\u00ed d\u1ee5, c\u1ea5p \u0111\u1ed9 b\u1ec1n c\u1ee7a ren h\u1ec7 m\u00e9t \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u l\u00e0 “8.8” ho\u1eb7c “12.9”, trong khi ren Unified l\u1ea1i s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u ri\u00eang bi\u1ec7t nh\u01b0 “Grade 5” ho\u1eb7c “Grade 8”. Sai s\u00f3t trong vi\u1ec7c \u0111\u00e1nh gi\u00e1 t\u00ednh t\u01b0\u01a1ng th\u00edch n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nh\u1eefng tai n\u1ea1n g\u00e3y v\u1ee1 ngo\u00e0i d\u1ef1 t\u00ednh.<\/p>\n<\/div>\n

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**D\u1eef li\u1ec7u ch\u00ednh: Th\u1ed1ng k\u00ea v\u1ec1 th\u1ecb tr\u01b0\u1eddng bu l\u00f4ng, \u1ed1c v\u00edt v\u00e0 s\u1eed d\u1ee5ng ti\u00eau chu\u1ea9n th\u1ebf gi\u1edbi**<\/div>\n<\/div>\n
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