ALL METRIC THREAD SIZES WITH FULL DESIGNATION

Complete list of all standard metric thread designations (M1 to M300)

Thread Designation	Type
M1 × 0.25	Coarse
M1 × 0.2	Fine
M1.1 × 0.25	Coarse
M1.1 × 0.2	Fine
M1.2 × 0.25	Coarse
M1.2 × 0.2	Fine
M1.4 × 0.3	Coarse
M1.4 × 0.2	Fine
M1.6 × 0.35	Coarse
M1.6 × 0.2	Fine
M1.8 × 0.35	Coarse
M1.8 × 0.2	Fine
M2 × 0.4	Coarse
M2 × 0.25	Fine
M2.2 × 0.45	Coarse
M2.2 × 0.25	Fine
M2.5 × 0.45	Coarse
M2.5 × 0.35	Fine
M3 × 0.5	Coarse
M3 × 0.35	Fine
M3.5 × 0.6	Coarse
M3.5 × 0.35	Fine
M4 × 0.7	Coarse
M4 × 0.5	Fine
M4.5 × 0.75	Coarse
M4.5 × 0.5	Fine
M5 × 0.8	Coarse
M5 × 0.5	Fine
M5.5 × 0.5	Coarse
M6 × 1	Coarse
M6 × 0.75	Fine
M6 × 0.5	Fine
M7 × 1	Coarse
M7 × 0.75	Fine
M8 × 1.25	Coarse
M8 × 1	Fine
M8 × 0.75	Fine
M9 × 1.25	Coarse
M9 × 1	Fine
M9 × 0.75	Fine
M10 × 1.5	Coarse
M10 × 1.25	Fine
M10 × 1	Fine
M10 × 0.75	Fine
M11 × 1.5	Coarse
M11 × 1	Fine
M11 × 0.75	Fine
M12 × 1.75	Coarse
M12 × 1.5	Fine
M12 × 1.25	Fine
M12 × 1	Fine
M12 × 0.75	Fine
M14 × 2	Coarse
M14 × 1.5	Fine
M14 × 1.25	Fine (Spark plugs only)
M14 × 1	Fine
M15 × 1.5	Coarse
M15 × 1	Fine
M16 × 2	Coarse
M16 × 1.5	Fine
M16 × 1	Fine
M17 × 1.5	Coarse
M17 × 1	Fine
M18 × 2.5	Coarse
M18 × 2	Fine
M18 × 1.5	Fine
M18 × 1	Fine
M20 × 2.5	Coarse
M20 × 2	Fine
M20 × 1.5	Fine
M20 × 1	Fine
M22 × 2.5	Coarse
M22 × 2	Fine
M22 × 1.5	Fine
M22 × 1	Fine
M24 × 3	Coarse
M24 × 2	Fine
M24 × 1.5	Fine
M24 × 1	Fine
M25 × 2	Coarse
M25 × 1.5	Fine
M25 × 1	Fine
M26 × 1.5	Coarse
M27 × 3	Coarse
M27 × 2	Fine
M27 × 1.5	Fine
M27 × 1	Fine
M28 × 2	Coarse
M28 × 1.5	Fine
M28 × 1	Fine
M30 × 3.5	Coarse
M30 × 3	Fine (Avoid)
M30 × 2	Fine
M30 × 1.5	Fine
M30 × 1	Fine
M32 × 2	Coarse
M32 × 1.5	Fine
M33 × 3.5	Coarse
M33 × 3	Fine (Avoid)
M33 × 2	Fine
M33 × 1.5	Fine
M33 × 1	Fine
M35 × 1.5	Coarse (Bearing lock nuts only)
M36 × 4	Coarse
M36 × 3	Fine
M36 × 2	Fine
M36 × 1.5	Fine
M38 × 1.5	Coarse
M39 × 4	Coarse
M39 × 3	Fine
M39 × 2	Fine
M39 × 1.5	Fine
M40 × 3	Coarse
M40 × 2	Fine
M40 × 1.5	Fine
M42 × 4.5	Coarse
M42 × 4	Fine
M42 × 3	Fine
M42 × 2	Fine
M42 × 1.5	Fine
M45 × 4.5	Coarse
M45 × 4	Fine
M45 × 3	Fine
M45 × 2	Fine
M45 × 1.5	Fine
M48 × 5	Coarse
M48 × 4	Fine
M48 × 3	Fine
M48 × 2	Fine
M48 × 1.5	Fine
M50 × 3	Coarse
M50 × 2	Fine
M50 × 1.5	Fine
M52 × 5	Coarse
M52 × 4	Fine
M52 × 3	Fine
M52 × 2	Fine
M52 × 1.5	Fine
M55 × 4	Coarse
M55 × 3	Fine
M55 × 2	Fine
M55 × 1.5	Fine
M56 × 5.5	Coarse
M56 × 4	Fine
M56 × 3	Fine
M56 × 2	Fine
M56 × 1.5	Fine
M58 × 4	Coarse
M58 × 3	Fine
M58 × 2	Fine
M58 × 1.5	Fine
M60 × 5.5	Coarse
M60 × 4	Fine
M60 × 3	Fine
M60 × 2	Fine
M60 × 1.5	Fine
M62 × 4	Coarse
M62 × 3	Fine
M62 × 2	Fine
M62 × 1.5	Fine
M64 × 6	Coarse
M64 × 4	Fine
M64 × 3	Fine
M64 × 2	Fine
M64 × 1.5	Fine
M65 × 4	Coarse
M65 × 3	Fine
M65 × 2	Fine
M65 × 1.5	Fine
M68 × 6	Coarse
M68 × 4	Fine
M68 × 3	Fine
M68 × 2	Fine
M68 × 1.5	Fine
M70 × 6	Coarse
M70 × 4	Fine
M70 × 3	Fine
M70 × 2	Fine
M70 × 1.5	Fine
M72 × 6	Coarse
M72 × 4	Fine
M72 × 3	Fine
M72 × 2	Fine
M72 × 1.5	Fine
M75 × 4	Coarse
M75 × 3	Fine
M75 × 2	Fine
M75 × 1.5	Fine
M76 × 6	Coarse
M76 × 4	Fine
M76 × 3	Fine
M76 × 2	Fine
M76 × 1.5	Fine
M78 × 2	Coarse
M78 × 1.5	Fine
M80 × 6	Coarse
M80 × 4	Fine
M80 × 3	Fine
M80 × 2	Fine
M80 × 1.5	Fine
M82 × 2	Coarse
M82 × 1.5	Fine
M85 × 6	Coarse
M85 × 4	Fine
M85 × 3	Fine
M85 × 2	Fine
M90 × 6	Coarse
M90 × 4	Fine
M90 × 3	Fine
M90 × 2	Fine
M95 × 6	Coarse
M95 × 4	Fine
M95 × 3	Fine
M95 × 2	Fine
M100 × 6	Coarse
M100 × 4	Fine
M100 × 3	Fine
M100 × 2	Fine
M105 × 6	Coarse
M105 × 4	Fine
M105 × 3	Fine
M105 × 2	Fine
M110 × 6	Coarse
M110 × 4	Fine
M110 × 3	Fine
M110 × 2	Fine
M115 × 6	Coarse
M115 × 4	Fine
M115 × 3	Fine
M115 × 2	Fine
M120 × 6	Coarse
M120 × 4	Fine
M120 × 3	Fine
M120 × 2	Fine
M125 × 8	Coarse
M125 × 6	Fine
M125 × 4	Fine
M125 × 3	Fine
M125 × 2	Fine
M130 × 8	Coarse
M130 × 6	Fine
M130 × 4	Fine
M130 × 3	Fine
M130 × 2	Fine
M135 × 6	Coarse
M135 × 4	Fine
M135 × 3	Fine
M135 × 2	Fine
M140 × 8	Coarse
M140 × 6	Fine
M140 × 4	Fine
M140 × 3	Fine
M140 × 2	Fine
M145 × 6	Coarse
M145 × 4	Fine
M145 × 3	Fine
M145 × 2	Fine
M150 × 8	Coarse
M150 × 6	Fine
M150 × 4	Fine
M150 × 3	Fine
M150 × 2	Fine
M155 × 6	Coarse
M155 × 4	Fine
M155 × 3	Fine
M155 × 2	Fine
M160 × 8	Coarse
M160 × 6	Fine
M160 × 4	Fine
M160 × 3	Fine
M165 × 6	Coarse
M165 × 4	Fine
M165 × 3	Fine
M170 × 8	Coarse
M170 × 6	Fine
M170 × 4	Fine
M170 × 3	Fine
M175 × 6	Coarse
M175 × 4	Fine
M175 × 3	Fine
M180 × 8	Coarse
M180 × 6	Fine
M180 × 4	Fine
M180 × 3	Fine
M185 × 6	Coarse
M185 × 4	Fine
M185 × 3	Fine
M190 × 8	Coarse
M190 × 6	Fine
M190 × 4	Fine
M190 × 3	Fine
M195 × 6	Coarse
M195 × 4	Fine
M195 × 3	Fine
M200 × 8	Coarse
M200 × 6	Fine
M200 × 4	Fine
M200 × 3	Fine
M205 × 6	Coarse
M205 × 4	Fine
M205 × 3	Fine
M210 × 8	Coarse
M210 × 6	Fine
M210 × 4	Fine
M210 × 3	Fine
M215 × 6	Coarse
M215 × 4	Fine
M215 × 3	Fine
M220 × 8	Coarse
M220 × 6	Fine
M220 × 4	Fine
M220 × 3	Fine
M225 × 8	Coarse
M225 × 6	Fine
M225 × 4	Fine
M225 × 3	Fine
M230 × 6	Coarse
M230 × 4	Fine
M230 × 3	Fine
M235 × 6	Coarse
M235 × 4	Fine
M235 × 3	Fine
M240 × 8	Coarse
M240 × 6	Fine
M240 × 4	Fine
M240 × 3	Fine
M245 × 6	Coarse
M245 × 4	Fine
M245 × 3	Fine
M250 × 8	Coarse
M250 × 6	Fine
M250 × 4	Fine
M250 × 3	Fine
M255 × 6	Coarse
M255 × 4	Fine
M255 × 3	Fine
M260 × 8	Coarse
M260 × 6	Fine
M260 × 4	Fine
M260 × 3	Fine
M265 × 8	Coarse
M265 × 6	Fine
M265 × 4	Fine
M270 × 8	Coarse
M270 × 6	Fine
M270 × 4	Fine
M275 × 6	Coarse
M275 × 4	Fine
M280 × 8	Coarse
M280 × 6	Fine
M280 × 4	Fine
M285 × 8	Coarse
M285 × 6	Fine
M285 × 4	Fine
M290 × 6	Coarse
M290 × 4	Fine
M295 × 6	Coarse
M295 × 4	Fine
M300 × 8	Coarse
M300 × 6	Fine
M300 × 4	Fine

Total thread designations: 444 standard metric thread sizes

Notes:

• All designations are based on ISO 261:1998
• Coarse pitch threads are the most common and widely available
• Fine pitch threads provide better adjustment precision and vibration resistance
• M14 × 1.25 is reserved for spark plugs only
• M35 × 1.5 is reserved for bearing lock nuts only
• M30 × 3 and M33 × 3 should be avoided if possible

ISO 965-1

COMPLETE METRIC THREAD SIZE TABLE AND SELECTION MANUAL

METRIC THREAD DESIGNATION – QUICK GUIDE FOR DRAWINGS

ISO 724 Metric Screw Threads – Metric Tap Drill Table

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