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Technical Information

Cast Iron

Cast sections and base plates are supplied with unmachined surfaces painted, and are machined to the following tolerances:-

Parallelism ± 1/5000 (0.02/100mm) (0.0025"/12")
Flatness ± 1/6000  
Squareness ± 1 minute (0.029/100mm) (0.0035"/12")
General Dimensions Diameter, Depth and Width ± 0.4mm
Thickness ± 1/100 of Nominal

Cast Iron and Aluminium

The ends of all cut sections are supplied sawn such that they will clean up to the lengths stated iin this catalogue.

Steel

All steel parts are treated with a chemical black finish (unless otherwise stated) which gives adequate protection against rusting under normal workshop conditions.
Where stated as being surface hardened these parts have a wear resistant hardness in the range 50-60 HRC.
Metric threads are to ISO Coarse series except where otherwise stated.
Our products are constantly reviewed on a fitness for purpose basis and we reserve the right to change specifications, finishes etc. without prior notice.

Plastic

Bakelite
Specific weight 1,4 g/cm3 Mechanical pressure resistance 200 N/mm2
Maximum temperature 160ºC up to 2 hours
140ºC 5000 hours
120ºC 25000 hours
Fire resistance
Elasticity
Di-electrical rigidity
V-1 - ul 94
6 - 8 KN/mm2
50 - 100 KV/cm

Thermoplastic
Specific weight 1,13 g/cm3
Water absorption 1,8% after 24 hours
Resistance to torsion 1050 Kg/cm2
Resistance to compression 620 Kg/cm3
Hardness Rockwell R 119
Maximum heat 135º Celcius
Glass Fibre reinforced plastic
Specific weight 1,44 g/cm3
Water absorption 1,6% after 24 hours
Resistance to torsion 293 MPa
Hardness Rockwell R 93
Maximum heat 145º Celcius

Please Note:
Data columns headed with g or kg refer to the approximate weight of each product.
All dimensions in metric unless otherwise shown.

If you require technical information on the Spencer Franklin range click here


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