368 TOOL STEEL FOR THE UNITED STATES NAVY. 



dential by the engineer officer if the bidder request it. The material will 

 be tested if, in the opinion of the engineer officer, it is considered suitable 

 for the purpose intended. 



24. Defective material. — If material, when being manufactured into 

 tools, develops physical defects which could not be detected by inspection, 

 such as "cracks," "pipes," etc., the manufacturer of this steel shall replace, 

 without cost to the government, such defective material. 



PURPOSE FOR WHICH THE STEEL, IS INTENDED. 



Tungsten Steel. 



25. Class I. — Lathe and planer tools, milling-machine tools, etc., and 

 in general all tools for which high-speed steel is used. 



26. Class 2. — Lathe and planer tools, and in general tools for finishing 

 purposes, either steel or brass. 



Carbon Steel. 



27. Class I. — Lathe and planer tools, drills, taps, reamers, screw-cutting 

 dies, taps, and tools requiring keen cutting edge combined with great 

 hardness. 



28. Class 2. — Milling cutters, mandrels, trimmer dies, threading dies, 

 and general machine-shop tools requiring a keen cutting edge combined with 

 hardness. 



29. Class 3. — Pneumatic chisels, punches, shear blades, etc., and in 

 general tools requiring hard surface with considerable tenacity. 



30. Class 4. — Rivet sets, hammers, cupping tools, smith tools, hot drop 

 forge dies, etc., and in general tools which require great toughness combined 

 with the necessary hardness. 



Copies of the above specifications can be obtained upon application to 

 the various navy pay officers or to the Bureau of Supplies and Accounts, 

 Navy Department, Washington, D. C. 



References: Department's order, Dec. 12, 1908; Tool Steel Board, 

 June 7, 1911; Dept., 25i64-2oof., June 8, 1911; Bu. C. and R., 2328-A. 

 104, June 13, 1911; S. and A., 73975, 85744, and 104054. 



