British Pipe Threads

Search the Newman Tools site

order on line
add to cart

Taps | Taps drill sizes

55 degree Whitworth Thread Form. Whitworth Pipe Threads are used almost exclusively by countries which are otherwise on the metric system.


 

"G: Series British Standard Pipe - Parallel ( Straight ) BSP or BSPF

Also referred to as British Gas, British Pipe Parallel or Parallel Fastening thread.

Various Symbols: BSP, BSPP, BSSPI, BSPF, BSPG, PS, R, G.

 


 

"Rc: Series British Standard Pipe - Taper- BSPT

Also referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread.

Taper is 3/4" taper per foot ( 1 in 16 on the diameter)

Various Symbols: BSPT, BSPTr, PT, KR, Rc.

 


BSP British Straight and Taper Pipe Taps
BSP and BSPT

Nominal Size
(inches)
T P I Major Diameter
(inches)
1/8" 28 0.383
1/4" 19 0.518
3/8" 19 0.656
1/2" 14 0.825
5/8" 14 0.902
3/4" 14 1.041
7/8" 14 1.189
1" 11 1.309

 1-1/4"

11

 1.650

 1-1/2"

11

1.882

1-3/4"

11

2.116

2"

11

2.347

2-1/4"

11

2.587

2-1/2"

11

2.960

3"

11

3.460



 

suggested tap drill sizes

British Standard Pipe
Parallel or Taper
BSP or BSPT

Nominal Size
(inches)
T P I Major Diameter
(inches)
Tapping Drill Size Tapping Drill Size
     

BSP

BSPT
         

1/16

28

0.304
6.6 mm  
 Letter drill G  

1/8

28

0.383
8.8 mm  8.4mm
 11/32 inch 21/64"

1/4

19

0.518
11.8 mm 11.2mm

 29/64"
7/16"

3/8

19

0.656
15.25 mm  14.75mm
 19/32" 37/64"

1/2

14

0.825
19.00mm 18.25mm
 
3/4"
23/32"

5/8

14

0.902
21 mm  
 53/64"  

3/4

14

1.041
24.5 mm 23.75mm
 31/32" 15/16"

7/8

14

1.189
28.25 mm  
 1-7/64"  

1 inch

11

1.309
30.75 mm 30mm
 1-13/64" 1-11/64"

 1-1/4"

11

 1.650

 39.50 mm
38.5mm
 1-35/64" 1-33/64"

 1-1/2"

11

1.882

45.5 mm
44.5mm
 1-25/32" 1-3/4"

1-3/4"

11

2.116

51.00 mm
 
 2"  

2"

11

2.347

57 mm
56mm
 2-1/4" 2-3/16"

 

link to tap index page

servicing the Canadian provinces of Newfoundland, Nova Scotia, New Brunswick, Prince Edward Island, Quebec, Ontario, Manitoba, Saskatchewan, Alberta ,British Columbia and the states of Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin,Wyoming We can ship via UPS to Afghanistan , Aland Islands , Albania , Algeria , American Samoa , Andorra , Angola , Anguilla , Antigua & Barbuda , Argentina , Armenia , Aruba , Australia , Austria , Azerbaijan , Azores , Bahamas , Bahrain , Bangladesh , Barbados , Belarus , Belgium , Belize , Benin , Bermuda , Bhutan , Bolivia , Bonaire , Bosnia , Botswana , Brazil , British Virgin Isles , Brunei , Bulgaria , Burkina Faso , Burundi , Cambodia , Cameroon , Canada , Canary Islands , Cape Verde , Cayman Islands , Central African Republic , Chad , Chile , China , Colombia , Comoros , Congo , Cook Islands , Costa Rica , Croatia , Curacao , Cyprus , Czech Republic , Democratic Republic of Congo , Denmark , Djibouti , Dominica , Dominican Republic , Ecuador , Egypt , El Salvador , England , Equatorial Guinea , Eritrea , Estonia , Ethiopia , Faeroe Islands , Fiji , Finland , France , French Guiana , French Polynesia , Gabon , Gambia , Georgia , Germany , Ghana , Gibraltar , Greece , Greenland , Grenada , Guadeloupe , Guam , Guatemala , Guernsey , Guinea , Guinea-Bissau , Guyana , Haiti , Holland , Honduras , Hong Kong , Hungary , Iceland , India , Indonesia , Iraq , Ireland , Israel , Italy , Ivory Coast , Jamaica , Japan , Jersey , Jordan , Kazakhstan , Kenya , Kiribati , Kosrae , Kuwait , Kyrgyzstan , Laos , Latvia , Lebanon , Lesotho , Liberia , Libya , Liechtenstein , Lithuania , Luxembourg , Macau , Macedonia (Fyrom) , Madagascar , Madeira , Malawi , Malaysia , Maldives , Mali , Malta , Marshall Islands , Martinique , Mauritania , Mauritius , Mayotte , Mexico , Micronesia , Moldova , Monaco , Mongolia , Montenegro , Montserrat , Morocco , Mozambique , N. Mariana Islands , Namibia , Nepal , Netherlands , Netherlands Antilles , New Caledonia , New Zealand , Nicaragua , Niger , Nigeria , Norfolk Island , Northern Ireland , Norway , Oman , Pakistan , Palau , Panama , Papua New Guinea , Paraguay , Peru , Philippines , Poland , Ponape , Portugal , Puerto Rico , Qatar , Reunion , Romania , Rota , Russia , Rwanda , Saba , Saipan , San Marino , Saudi Arabia , Scotland , Senegal , Serbia , Seychelles , Sierra Leone , Singapore , Slovakia , Slovenia , Solomon Islands , South Africa , South Korea , Spain , Sri Lanka , St. Barthelemy , St. Christopher , St. Croix , St. Eustatius , St. John , St. Kitts & Nevis , St. Lucia , St. Maarten , St. Martin , St. Thomas , St. Vincent/Grenadines , Suriname , Swaziland , Sweden , Switzerland , Syria , Tahiti , Taiwan , Tajikistan , Tanzania , Thailand , Timor Leste , Tinian , Togo , Tonga , Tortola , Trinidad & Tobago , Truk , Tunisia , Turkey , Turkmenistan , Turks & Caicos Islands , Tuvalu , Uganda , Ukraine , Union Island , United Arab Emirates , United Kingdom , United States , Uruguay, US Virgin Islands , Uzbekistan , Vanatu , Vatican City State , Venezuela , Vietnam , Virgin Gorda , Wales , Wallia & Futuna Islands , Western Samoa , Yap , Yemen , Zambia , Zimbabwe