Protractors


A protractor is a mathematical instrument made from clear plastic used for measuring angles in degrees such as the angles of a triangle or a hexagon.
Types of Protractor
• Semi-Circular Protractor: This protractor has two sets of scales graduated up to 180° in opposite directions enabling angles to be read from two directions. On the base of the protractor is a midpoint mark that indicates the position of the highest point of the angle that is going to be measured or the vertex. The semi-circular protractor is used for reading, drawing and plotting angles on paper or charts. This type of protractor is commonly used in classrooms for geometry and in mechanical and engineering-related applications.
• The Vernier Scale: This is used on protractors to enable them to give more precise and accurate measurements. There are 60 minutes in a degree and regular protractors have a scale graduated in degrees. In the Vernier scale, each graduation represents 5 minutes or 1/12 of a degree. The Vernier scale is found underneath the main degree scale and is spaced so it reads at a constant fraction of the fixed main scale.
• Bevel Protractors: These are able to measure through 360° by using one or two swinging arms that can help measure the angle. The construction of a bevel protractor consists of a beam, graduated dial and a blade which is connected to a swivel plate by thumb nut and clamp. There are variants on this design including a universal precision protractor and precision universal Vernier protractor which have a more technical design. Bevel protractors are more accurate than regular protractors as they use a Vernier scale along with a fixed scale. The fixed dial or main scale has four sections with each one graduated from 0 ° to 90 °. The Vernier scale has 24 divisions with 12 divisions on either side of 0 with each division representing 5 minutes. As with the regular protractor the Vernier scale is bidirectional and can be read to either side. Bevel protractors are designed for making for high precision measurements and are commonly used for producing mechanical and architectural drawings and by tool makers. Bevel protractors are often ground and made from stainless steel. Some protractors have a satin chrome finish to improve visibility of the scales.

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Description Price Resolution Vernier Calibrated Bevel Blade Length Imperial or Metric Blade Material
RS Stock No. 111-5883
BrandRS PRO
£58.57
Each
Units
1 ° - - Yes 150mm Metric Tempered Steel
RS Stock No. 111-5902
BrandRS PRO
£91.93
Each
Units
1 ° - RSCAL Yes 150mm Metric Tempered Steel
RS Stock No. 121-8209
BrandRS PRO
£91.93
Each
Units
1 ° - UKAS Yes 150mm Metric Tempered Steel
RS Stock No. 235-7550
BrandRS PRO
£95.20
Each
Units
2 arcmin Yes - Yes 150mm Metric Stainless Steel
RS Stock No. 264-3592
BrandRS PRO
£45.56
Each
Units
5 ° - - - 6in Metric Steel
RS Stock No. 785-7894
BrandRS PRO
£101.27
Each
Units
5 arcmin Yes - Yes 150mm - Alloy Steel
RS Stock No. 264-3508
BrandRS PRO
£109.35
Each
Units
5 arcmin - - Yes 150 mm, 300 mm Metric Steel
RS Stock No. 387-0161
BrandRS PRO
£59.70
Each
Units
1 ° - - - 6in Imperial Tempered Steel
RS Stock No. 264-8317
BrandRS PRO
£45.56
Each
Units
5 ° - - - 6in Metric Steel
RS Stock No. 146-5503
BrandRS PRO
£15.94
Each
Units
- Yes - - 190mm Both Stainless Steel
RS Stock No. 721-1569
Mfr. Part No.1885.00
BrandFacom
£29.06
Each
Units
- - - Yes 170mm Metric Stainless Steel
RS Stock No. 304-8184
£70.10
Each
Units
5 arcmin - - Yes 150mm Metric Stainless Steel
RS Stock No. 466-750
Mfr. Part No.505A-7
BrandStarrett
£39.44
Each
Units
- - - - 7in Metric Aluminium
RS Stock No. 492-005
Mfr. Part No.DZ803
BrandStarrett
£27.37
Each
Units
- - - - - Imperial -
RS Stock No. 304-8207
Mfr. Part No.400 300MM
£79.82
Each
Units
5 arcmin - - Yes 300mm Metric Stainless Steel
RS Stock No. 609-023
Mfr. Part No.DW8252
BrandStarrett
£88.03
Each
Units
1 ° - - Yes 12in - Cast Iron
RS Stock No. 315-9133
Mfr. Part No.4214052RS
BrandMahr
£162.50
Each
Units
5 arcmin Yes - Yes 300mm Metric Stainless Steel
RS Stock No. 304-8190
£76.57
Each
Units
5 arcmin - - Yes 200mm Metric Stainless Steel
RS Stock No. 315-9127
Mfr. Part No.4214050RS
BrandMahr
£270.00
Each
Units
5 arcmin Yes - Yes 150mm Metric Stainless Steel