# Grammar Guide

### Express all specific measured quantities (dimensions, degrees, weights, distances, sums of money, etc.) in numeral form.

Correct | Incorrect |
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1.3 seconds or 1.3 sec | One point three seconds |

$25,000 | Twenty-five thousand dollars |

2 amp | two amperes |

### Write numbers beginning a sentence as words.

Correct | Incorrect |
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Twenty-three screws are included. | 23 screws are included. |

### Write approximate or non-specific numbers in a sentence as words.

Correct | Incorrect |
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about half; a quarter of; four times as often. | about ½; a ¼ of; 4 times as often. |

'60s, '70s & '80s or 1960s, 1970s or 1980s | 60s, 70s, & 80s or Sixties, Seventies, and Eighties |

### Hyphenate all compound numbers from twenty-one through ninety-nine in a sentence.

Correct | Incorrect |
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There are twenty-three screws included. | There are twenty three screws included. |

### Write decimals as numbers. Place a zero in front of decimals with no whole number.

Correct | Incorrect |
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0.128 mm | .128 mm |

1.33 mm | One point three millimeters |

### Don't use a space between whole numbers and fractions. Use fractions on the web.

Print Correct | Incorrect |
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1½ | 11/2 |

2⅔ | 2-2/3 |

Web Correct | Incorrect |

2-3/4 | 2 3/4 |

1-1/2" | 1.5" |

### Use a space between numbers and units of measure.

Correct | Incorrect |
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89 mm Piston & Liner Set | 89mm Piston & Liner Set |

### Do not use a space between numbers and measurement signs.

Correct | Incorrect |
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11% | 11 % |

A 36° angle. | A 36 ° angle. |

5' 3" | 5 ' 3 " |

### Use decimals with temperature scales. Do not express temperature degrees with the ° symbol. Use a space after the number.

Correct | Incorrect |
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15.1 F | 15.1F |

-45 C | -45°C |

2,700 K | .045 °K |

### For imperial measurements, use fractions for print, and decimals for web.

Print Correct | Print Incorrect |
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^{5}⁄_{16} |
0.3125" |

Painted, 60 spoke, 15" x 4 ½" | Painted, 60 spoke, 15"x4.5" |

Web Correct | Web Incorrect |

Painted, 60 spoke, 15" x 4.5" | Painted, 60 spoke, 15" x 4 ½" |

### Use decimals with metric.

Correct | Incorrect |
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7.9375 mm | 0.3125" |

### Units of measure are case-sensitive. mm is millimeter (one thousandth of a meter) Mm is megameter (1,000,000 meters)

Correct | Incorrect |
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A 5 mm x 0.8 mm pitch tap | A 5 MM x 0.8 mm pitch tap." |

### Treat unit names like ordinary nouns when spelled out in full. Thus the names of units start with a lower-case letter, except at the beginning of a sentence or in a title. When repeating multiple measurements consider spelling out the unit name for the first instance then using the abbreviation on following instances.

Unit Name | Unit of Measure | Use |
---|---|---|

millimeter | mm | 1 mm |

centimeter | cm | 6 cm |

amperes/amps | amp or A | 4 A |

volts | V | 8 V |

watts | W | 12 W |

joules | J | 6.7 J |

lumens | lm | 142 lm |

ohms | ohms | 10 Ω |

decibels | dB | 120 dB |

hertz | Hz | 160 Hz |

inches | " or in | 6 in |

feet | ' or ft | 14 ft |

pound | lb | 10 lb |

ounce | oz | 10 oz |

AM/PM | am/pm | 8 am |

pressure (pounds per square inch) | psi | 35 psi |

torque (foot-pounds) | ft-lb | 80 ft-lb |

torque (inch-pounds) | in-lb | 120 in-lb |

### Do not use "plural" units of measure.

Correct | Incorrect |
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2 mL | 2 mLs |

14 lb | 14 lbs |

### Do not use a period after a unit of measure. They are not abbreviations.

Correct | Incorrect |
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14 lb | 14 lb. |

12' 9" | 12 ft. 9 in. |

### Express dimensions by length, width, and height/depth, separated by an "x" with spaces in between. List dimension units when needed for clarification.

Correct | Incorrect |
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48" x 12" x 2" | 48"x12"x2" |

8.5 cm x 11 mm x 1 cm | 8.5cmx11mmx1cm |

Size: 7½"(l) x 7⅘"(w) x 2¾"(h) with 3" end stop | Size: 71/2" (L)x74/5" (W)x23/4" (H) with 3" end stop |

### Do not mix imperial and metric.

Correct | Incorrect |
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21.59 cm x 1 mm | 8 ½" x 1 mm |

### Do not mix symbols and units.

Correct | Incorrect |
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1" x 6' Easy Loom | 1" x 6 ft Easy Loom |

1 in x 6 ft Easy Loom | 1" x 6 ft Easy Loom |

### For a range of numbers, use an n-dash with no spaces before or after. For dates, use the full year for the first date and the 2 digit abbreviation for the second.

Correct | Incorrect |
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Dia: 15"–16"; Grip: 2 3/4"–3 1/8" | Dia: 15" - 16"; Grip: 2 3/4" – 3 1/8" |

1968-73 | 1968 - 73 |

Add a space after w/ |

Change "O" ring to O-ring |

' (single prime) |

" (double prime) |

‘’ (single quotation marks) |

“” (double quotation marks) |

’ (apostrophe) |

° Bullets - bullets are thoughts and don't have periods at the end. Bullets are a single sentence. They are more than 1 sentence make 2 bullets or rewrite. |