Further Information

Pipe Fittings

Crane Fluid Systems offer a full range of pipe fittings in malleable iron or mild steel.


Crane Fluid Systems offer a full range of malleable iron pipe fittings, available in sizes from 1/8" to 6" PN25 rated. Crane FS taper threads meet BS EN 10226-2 (ISO 7-1).

Malleable iron pipe fittings are available in black and galvanised finishes, the majority of fittings have the BSI Kitemark approval. Malleable iron fittings conforming to BS EN 10242 and have UL approval.

Crane Fluid Systems malleable iron is of the Blackheart type ideally suited to pipe fitting and manufacture and conforms to BS EN 1562 Designation EN-GJMB-300-6, ASTM A197 and ISO 5922.

The close relationship between the physical properties of test bars and actual castings ensures design integrity and the preservation of high safety factors. Shock pressures within pipe systems can be tolerated with complete safety. The corrosion resistance of Crane malleable iron is good when compared with grey cast iron and mild steel for most general applications including water, gas and steam.

Mild Steel

BS 143 and 1256 allow small size (3/8" and smaller) straight fittings to be supplied in other ferrous materials eg. Mild steel, as an alternative to malleable cast iron, providing the mechanical properties are at least equivalent to the specified grade of malleable iron. Individual data pages state which Crane fittings are supplied in mild steel.


Where additional resistance to corrosion is required, malleable cast iron fittings can be hot-dip zinc coated (galvanised) prior to machining. This process involves coating the fittings with zinc which, in addition to its natural resistance to corrosion, provides electrochemical protection where the iron of the fitting is exposed by damage. Mild steel fittings can be supplied with a proprietary zinc-based coating. The coating weight on Crane galvanised fittings conforms to the requirements of BS EN ISO 1461 1998 and ASTM 153 with a minimum coating of 610 g/m2 (2oz/ft2) equal to a thickness of 86μm (0.0034 in). Average coatings are well in excess of this and exceed the requirements given in BS EN 10242 and ISO 49.When ordering galvanised or zinc coated fittings add the suffix ‘G’ to the figure number.


Pressure/Temperature Ratings

BS 143 & 1256:1986 states that fittings are for general purposes for the transmission of fluids within the pressure and temperature ranges specified. The ratings given are uprated from those in the 1968 edition.


The graph below shows the BS pressure temperature ratings. Crane malleable iron fittings are suitable for use at these new ratings with the exception of certain unions (see note Ø below), but such use is dependent on the suitability of the connecting pipe material, the threaded joint and any thread sealants used. Due consideration should also be given to any applicable codes of practice. Pressures stated are maximum non-shock gauge.



*Hot dip zinc coated (galvanised) fittings should not be used below -10°C (14°F).

Ø Figure No. 241 unions are limited to 230°C maximum.

Figure Nos. 271, 272 and 289 unions are limited to 208°C maximum.

Dimensions given do not allow for tapping or threading tolerances.



Production testing: Meets requirements of BS EN 10242 or BS 143 and 1256 as applicable. Type testing: In addition to production testing, all pressure containing fittings are required by BS EN 10242, BS 143 & 1256 and ISO 49 to be designed to withstand specified design test pressures and to be type tested accordingly - 100 bar (1450 lbf/in2) for sizes 4 and smaller malleable iron fittings and 64 bar (928 lbf/in2) for sizes 5 and 6 malleable iron. Tests carried out show that production fittings have safety margins well in excess of the BS requirement. Some typical burst tests on Crane fittings illustrate their capabilities - size 1/2 figure no. 193 bend tested to 550 bar (8000 lbf/in2) without failure; size 1 figure no. 241 flat seat union tested to 248 bar (3600 lbf/in2) without failure and size 6 figure no. 151 elbow tested to 190 bar(2750 lbf/in2) without failure.



All malleable iron fittings are given an oil finish as protection against rust while in stock or during transit and after installation prior to plant commissioning. Finished fittings are free of any polycyclic aromatic hydrocarbons.


Conformance of Crane Fittings

All Crane fittings are marked with the logo and where size permits, the fitting size and Kitemark symbol. In addition, some castings also display a pattern identification number. This is normally located next to the band of the fitting. This number is used during the manufacturing process as part of the rigorous quality control procedures to ensure consistent high-quality castings. The number is not of relevance to the end user of the product.

Both malleable iron and steel fittings have been verified by the British Standards Institute (BSI) as conforming to BS EN 10242 and BS 143 & 1256, as appropriate, and as such are permitted to bear the British Standards Kitemark Logo - Kitemark Licence No. KM00382.Some small size fittings are manufactured in steel and will conform to BS EN 10241.

Many malleable fittings are covered by UL certification.UL is a global leader in testing, inspection, certification,auditing and validation. UL Listing means that UL has tested representative samples of the product and determined that it meets UL’s requirements. These requirements are based primarily on UL’s published and nationally recognised Standards for Safety. UL approved fittings have been approved for use in fire protection such as sprinkler systems. Malleable Fittings Covered: 140, 144, 145, 146, 147, 148, 149, 150, 151, 152, 155,156, 161, 171, 177, 185, 192, 193, 197, 199.Constructed of blackheart malleable iron according to Standard BS EN 1562:1997, Grade EN-GJMB-300-6 Fittings may also utilise an optional zinc coating(galvanised) as described in BS EN 10242:1995, Sec. 5.2.For the details of the fittings range covered see the UL Certifications Directory at:

The Pressure Equipment Directive 97/23/Ec (PEd)

The Directive applies to the design, manufacture and conformity of pressure equipment and assemblies of pressure equipment with a maximum allowable pressure greater than 0.5 bar. Individual piping components, such as fittings, are excluded from the scope of the Directive and therefore cannot be CE marked. However, Crane pipe fittings are manufactured to the appropriate European standards and satisfy the essential safety requirements of the PED. A ‘Certificate of Incorporation for Pipe Fittings’ can be accessed on the Crane website, or will be provided on request from Crane.

Our Genius is Valves & Pipe Fittings