Metric thread seriesThescrew diameterDmmHexagonalWith a hexagonal holeSquareBolt / NutS1mmSmall bolt /NutS1mmHigh strengthbolt nutS1mmBoltS2mmButton boltS2mmShoulder boltS2mmSet screwS2mmBow boltS2mmBolt nutS1mmLarge boltS1mmSet screwS1mmM1.4 (1.3) (0.7)M1.6 3.2 1.5(1.5) 0.7M1.8 (0.7)M2 4 1.5(1.5) 0.9M2.2 (4.5)M2.5 5 2 1.3M3 5.5 2.5 2 (2) 1.5 2 5.5M3.5 (6)M4 7 3 2.5 (2.5) 2 2.5 7 4M4.5 (8)M5 8 4 3 3 2.5 3 8 5M610 5 4 4 3 410 6M711M813（12） 6 5 5 4 513 8M1016 (17)（14） 8 6 6 5 7172410M1218 (19)（17）21（22）10 8 8 6 8193012M1421 (22)（19）1222M1624（22）27141010 8122436M1827（24） (14)27M2030 (32)（27・29）32171210143041M2234 (32･35)（30・32）36 (17)3246M2436 (38)（32・35）411912173655M2741（36）46 (19)M3046（41）5022M3350（46） (24)M3655 (54)（50）27M3960 (58)（55） (27)M4265 (63)32M4570 (67) (32)M4875 (71)36M5280 (77) (36)M568541M6090M649546M68 (100)M72 (105)M76 (110)M80 (115)M85 (120)M90 (130)M95 (135)M100 (145)M105 (150)M110 (155)M115 (165)M120 (170)M125 (180)M130 (180･185)Across Flat Width & Bolt Diameter※1. For hexagonal bolt / small bolt, refer to JIS B 1180-2004, and for high strength bolt, refer to JIS B 1186-1995. 2. Refer to JIS B 1176-2006 for hex socket bolts, JIS B 1174-2006 for hex socket button bolts, and JIS B 1177-2007 for hex socket set screws. 3. For square bolt / large square bolt, refer to JIS B 1182-2009. For square set screw, refer to JIS B 1118-1995. 4. Values in ( ) are gures other than the old JIS or JIS.Reference Material490
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