£290.09

Starrett 20-3 Hardened Steel Master Precision Square, 2-3/8" Beam Length, 3" Blade Length

Silver, 20-3

Price data last checked 24 day(s) ago - will refresh soon

View at Amazon

We'll watch every seller, every day. One email when your price arrives.

It has never been this cheap. We have no record of a lower price.

£290 today · cheaper than every other day in the last 3 months

NEW HERE?

Amazon shows you one price. We show you all of them.

Tosheroon watches Amazon prices so you don't have to. Every product on Amazon has a price history — we make it visible. Set the price you'd actually pay, and we'll email you the second it gets there. No app, no account, one email.

WHAT'S ON THIS PAGE

↓ Price chart
when this has been cheap or pricey
↓ Forecast
where the price is heading next
↓ Statistics
all-time high & low, recent range
↑ Price alert
name your number, we'll email you

Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 67 days · 67 data points (no recent data)

Historical
Generating forecast…
£290.09 £275.59 £281.39 £287.19 £292.99 £298.79 £304.59 13 June 2026 29 June 2026 16 July 2026 01 August 2026 18 August 2026

Price Distribution

Price distribution over 67 days • 1 price levels

Days at Price
67 days 0 17 34 50 67 £290 Days at Price

Price Analysis

Most common price: £290 (67 days, 100.0%)

Price range: £290 - £290

Price levels: 1 different prices over 67 days

Description

This hardened steel square is used when extreme accuracy is required. The beams and blades are hardened, ground and lapped to insure parallelism and straightness. Made of high quality tool steel with the finest of craftsmanship throughout.

Key Features

Made of high quality tool steel

Squareness accuracy to 0.0001" (0.0025mm) every 6" (150mm)

The beam is grooved at the inner corner for clearance of burr or dirt

Length of blade from the inner edge of the beam to the end of the blade

Product Specifications

Barcode

No barcode data available

Similar Products You Might Like

Starrett 14MD Double Steel Square With Hardened, Ground Head And Blade, 50 mm Size
98% match

Starrett 14MD Double Steel Square With Hardened, Ground Head And Blade, 50 mm Size

Starrett

Price unavailable
Starrett 3020M-300 Try Square 300 x 175 mm Tool Steel
97% match

Starrett 3020M-300 Try Square 300 x 175 mm Tool Steel

Starrett

£160.08 16 Jul 2026
Starrett 10H-6-4R Cast Iron Square Head Student Combination Square, 4R Graduation, 6" Size
97% match

Starrett 10H-6-4R Cast Iron Square Head Student Combination Square, 4R Graduation, 6" Size

Starrett

£85.90 27 Aug 2026
Starrett C33H-12-4R 12-Inch Combination Square With Square Head Only
97% match

Starrett C33H-12-4R 12-Inch Combination Square With Square Head Only

Starrett

£164.09 25 Aug 2026
Starrett H11-1224 Cast Iron Square Head For Combination Squares, Combination Sets And Bevel Protractors, Black Wrinkle Finish
97% match

Starrett H11-1224 Cast Iron Square Head For Combination Squares, Combination Sets And Bevel Protractors, Black Wrinkle Finish

Starrett

£98.26 21 Aug 2026
Starrett 385-36 Steel Straight Edge With Bevel, 36" Length, 2-13/32" Width, 7/32" Thickness
96% match

Starrett 385-36 Steel Straight Edge With Bevel, 36" Length, 2-13/32" Width, 7/32" Thickness

Starrett

£237.62 21 Aug 2026
Starrett 387-48 Steel Straight Edge With Bevel And Graduated Edge, 48" Length, 2-13/32" Width, 7/32" Thickness
96% match

Starrett 387-48 Steel Straight Edge With Bevel And Graduated Edge, 48" Length, 2-13/32" Width, 7/32" Thickness

Starrett

£511.48 20 Aug 2026
Starrett 10MH-150 Student Combination Square - 150mm Metric
96% match

Starrett 10MH-150 Student Combination Square - 150mm Metric

Starrett

£60.69 26 Aug 2026
Starrett 3020m -150 Attack Angles from Tool Steel, Shank Length 150 mm, Rail Length 100 mm
96% match

Starrett 3020m -150 Attack Angles from Tool Steel, Shank Length 150 mm, Rail Length 100 mm

Starrett

Price unavailable
Starrett 384H Steel Parallel, 3/4" Width, 6" Length, 3/8" Thickness
96% match

Starrett 384H Steel Parallel, 3/4" Width, 6" Length, 3/8" Thickness

Starrett

£112.51 21 Aug 2026
Starrett C11MH-300 300mm Combination Square - Satin Chrome
96% match

Starrett C11MH-300 300mm Combination Square - Satin Chrome

Starrett

Price unavailable
Starrett 380-36 36-Inch Steel Straight Edge
96% match

Starrett 380-36 36-Inch Steel Straight Edge

Starrett

£288.25 16 Aug 2026
Starrett 380-24 24-Inch Steel Straight Edge
96% match

Starrett 380-24 24-Inch Steel Straight Edge

Starrett

£74.61 13 Aug 2026
Starrett 385-12 Steel Straight Edge With Bevel, 12" Length, 1-13/32" Width, 11/64" Thickness
96% match

Starrett 385-12 Steel Straight Edge With Bevel, 12" Length, 1-13/32" Width, 11/64" Thickness

Starrett

£108.42 10 Jul 2026
Starrett 14MA Millimetre Reading Double Steel Square 50mm with Graduated Blade
96% match

Starrett 14MA Millimetre Reading Double Steel Square 50mm with Graduated Blade

Starrett

£107.87 28 Aug 2026
Starrett 11MH-300 Cast Iron Square Head With Regular Blade Combination Square, Black Wrinkle Finish, 300 mm Size & 117D Centre Punch with Round Shank
96% match

Starrett 11MH-300 Cast Iron Square Head With Regular Blade Combination Square, Black Wrinkle Finish, 300 mm Size & 117D Centre Punch with Round Shank

Starrett

Price unavailable
Starrett 384Y Steel Parallel, 1-1/4" Width, 6" Length, 1/2" Thickness
96% match

Starrett 384Y Steel Parallel, 1-1/4" Width, 6" Length, 1/2" Thickness

Starrett

£196.09 09 Jul 2026
Starrett 578 Hardened Steel V-Block And Clamp For Larger Capacity Work
96% match

Starrett 578 Hardened Steel V-Block And Clamp For Larger Capacity Work

Starrett

£597.71 14 Aug 2026
Starrett 3020m -75 Attack Angles from Tool Steel, Shank Length 75 mm, Rail Length 50 mm
96% match

Starrett 3020m -75 Attack Angles from Tool Steel, Shank Length 75 mm, Rail Length 50 mm

Starrett

£61.13 11 Sep 2026
Starrett 11MH-300 Combination Square - 300mm Cast Iron Head
96% match

Starrett 11MH-300 Combination Square - 300mm Cast Iron Head

Starrett

£196.55 05 Sep 2026
Starrett 2900-4M LCD Electronic Indicator, 8mm Stem Dia., 0-12mm Range, 0.01mm and 0.001mm Graduation
96% match

Starrett 2900-4M LCD Electronic Indicator, 8mm Stem Dia., 0-12mm Range, 0.01mm and 0.001mm Graduation

Starrett

£571.79 14 Aug 2026
Starrett 11MHC-300 Cast Iron Square And Centre Heads With Regular Blade Combination Square, Black Wrinkle Finish, 300 mm Size
96% match

Starrett 11MHC-300 Cast Iron Square And Centre Heads With Regular Blade Combination Square, Black Wrinkle Finish, 300 mm Size

Starrett

£156.91 27 Aug 2026
Starrett 384A Steel Parallel, 1" Width, 6" Length, 1/8" Thickness
96% match

Starrett 384A Steel Parallel, 1" Width, 6" Length, 1/8" Thickness

Starrett

£98.41 19 Aug 2026
Starrett 384E Steel Parallel, 3/4" Width, 6" Length, 1/4" Thickness
96% match

Starrett 384E Steel Parallel, 3/4" Width, 6" Length, 1/4" Thickness

Starrett

£139.31 20 Aug 2026