SPRINGS 



127 



PHOSPHOR BRONZE SPRING WIRE— S.A.E. 81 



Used only for small springs, especially where resistance to moisture or other 

 corrosion is essential. Can be used in Class I, Class II, or Class III service. Diam- 

 eters are specified in Brown and Sharpe gage numbers. Square or rectangular mate- 

 rial may be used from a minimum size of M2 X M2 in. to a maximum of M X Yi in., 

 advancing by M2 in. 



1. Chemical Composition 



Tin ■.. .. 4.00-6.00 Iron, max 0.10 



Phosphorus 0.03-0.40 Lead, max 0. 10 



Zinc, max . 20 Copper remainder 



2. Tensile Strength 



Range of Wire 

 Diameter, In. 



Up to 0.0625 

 0.0625-0.1250 

 0.1250-0.2500 

 0.2500-0.3750 



Minimum 

 Tensile Strength, 

 Lb. per Sq. In. 

 130,000 

 120,000 

 110,000 

 100,000 



3. Bend Test 



The wire should be capable of being bent through an angle of 180 deg. flat back 

 on itself without fracture on the outside of the bent portion. 



4. Appearance 



The wire shall be uniform in quality and temper, cylindrical in shape, and smooth 

 and free from injurious defects. 



5. Dimensional Tolerances 



The wire shaU not vary from the specified diameter by more than the following: 

 Sizes over 0.050 in., by plus or minus 1 per cent 

 Sizes 0.050 to 0.025 in., by plus or minus 0.0005 in. 

 Sizes under 0.025 in., by plus or minus 0.00025 in. 



BRASS SPRING WIRE, S.A.E. 80 



This material may be used for the same types and classes of springs for which 

 phosphor bronze is suitable. It is available in two grades, as given below, Grade A 

 for use where the requirements are especially severe and Grade B for use under 

 ordinary conditions. Grade B will be furnished unless otherwise specified. 



