Johnson and Allen Ltd

Neocol Works, Smithfield, Sheffield S3 7AR
+44 (0)114 273 8066
+44 (0)114 272 9842
Melanie Robinson
Email address:
Web address:
  • E1 - Magnetic Particle Inspection (MPI)
  • LP - Liquid Penetrant Inspection
  • O1 - Visual Inspection
  • U2 - Ultrasonic Thickness Gauging
Affiliations & Approvals:
  • BSI Registered Firm
  • Trade Group Member (BINDT)
  • UKAS Accredited Laboratory
  • NAMRC Associate Member

Established over 80 years ago, Johnson & Allen Ltd is a market leader in both the design and manufacture of standard and bespoke MPI and DPI solutions. Johnson & Allen also continues to manufacture a range of quality aerosol and bulk consumables, which include magnetic inks, contrast paints, dye penetrants, developers and cleaners. Johnson & Allen now has over 45 years of experience in manufacturing aerosol products and over 80 years in manufacturing bulk products.

Johnson & Allen continues to export globally and supplies a wide range of industries, including aerospace, automotive, rail, oil & gas, military and general engineering. It is a well-established company with a proven track record; previous satisfied customers include companies such as Rolls-Royce, Vector Aerospace, Gulf Air and BAE Systems.

The company is BSI ISO 9001:2015 and safe contractor certified and is an associate member of the Nuclear Advanced Manufacturing Research Centre (NAMRC). Johnson & Allen is also the oldest UKAS-accredited calibration laboratory (4168) for the calibration of magnetic particle inspection lines, bench units and power packs; it is certified for both in-house and out-of-house calibrations covering outputs up to 10,000 A.

Founded in 1938 by Lawrence Johnson, Johnson & Allen is a professional company but still retains its family feel, a uniqueness that will continue with his granddaughter Melanie Robinson, Managing Director, and his great-grandson Simon Johnson. Supported by an exceptional team, many whom have been in the company for over 20 years, Johnson & Allen continually strives to improve and innovate.

Regardless of requirement or specification, Johnson & Allen considers all builds. It strongly believes its customers should not have to settle for second best because of manufacturer inflexibility.

Customers do not need to compromise with Johnson and Allen.

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