| Bolt Diameter Metric Standard | 3/8′′ 14mm 9/16′′ | 7/16′′ 16mm 5/8′′ | 1/2′′ 19mm 3/4′′ | 9/16′′ 21mm 13/16′′ |
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14mm = almost 9/16 inch . 15mm = almost 19/32 inch. 16mm = 5/8 inch.
| SAE Wrench Size Bolt Size (SI) Metric Wrench Size | 7/16′′ 1/4′′ 11 mm | 1/2′′ 5/16′′ 13 mm | 9/16′′ 3/8′′ 14 mm | 5/8′′ 7/16′′ 16 mm |
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14mm = almost 9/16 inch . 15mm = almost 19/32 inch. 16mm = 5/8 inch.
| 3/8′′ Drive 1/4′′ Drive 1/2′′ Drive | 12mm 9mm 15mm | 13mm 10mm 16mm | 14mm 11mm 17mm | 15mm 12mm 18mm |
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SAE, which stands for the Society of Automotive Engineers, was used as the standard primarily on U.S.-made cars and trucks through the 1970s. SAE sockets are sized in inches and fractions of inches .
Wrenches: Standard Combination Wrenches ( 1/4, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1 ) Metric Combination Wrenches (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19) Standard Flare Nut Wrenches (3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 7/8) Note: Each wrench may combine two sizes.
| Bolt Diameter Metric Standard | 3/8′′ 14mm 9/16′′ | 7/16′′ 16mm 5/8′′ | 1/2′′ 19mm 3/4′′ | 9/16′′ 21mm 13/16′′ |
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So what is a 10mm socket equivalent? The equivalent imperial size of a 10mm socket is a 3/8 socket . Imperial sizes are known as SAE (Society of Automotive Engineers) or Standard.
| SAE Metric Inch | 13mm 0.512 | 17/32′′ 0.531 | 14mm 0.551 | 9/16′′ 0.563 |
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| Dimensions — Inches to Metric | 0.563” 9/16” 14.30 mm | 0.625” 5/8” 15.88 mm | 0.688” 11/16” 17.48 mm | 0.750” 3/4” 19.05 mm |
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Most spark plugs require a 5/8′′ (16mm) size spark plug socket. This refers to the size of the flats on the spark plug that are in contact with the socket. This spark plug requires the 5/8′′ spark plug socket, which will probably fit a 3/8 ratchet extension.
| Decimal Fraction Metric | 0.1969 11.11 mm | 0.2188 7/32 11.91 mm | 0.2362 12 mm | 0.2500 1/4 12.7 mm |
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| MM Approximate Size In Inches Exact Size In Inches | 14mm 9/16 Inch 0.55118 Inches | 15mm Just short of 5/8 Inch 0.59055 Inches | 16mm 5/8 Inch 0.62992 Inches | 17mm Just short of 11/16 Inch 0.66929 Inches |
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Multiply the first number which is the bolt size in inches or millimeters, by 1.5 using a pocket calculator, if necessary. For example, for the numbers in Step 1, 1/2 x 1.5 = . 75 or 3/4, which is the wrench size needed for this standard-sized bolt.
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