About 5 times the value of SW (Helical Spring Lock Washer) No.3 (TOKUHATSU product)
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| Tokuhatsu spak and spring washers | ||||||||
| TOKUHATSU offers curved and wave spring washers "SPAK", with the following characteristics. | ||||||||
| High reactive tension | ||||||||
| About 12 times the value of SW (Helical Spring Lock Washer) No.2 (TOKUHATSU product) About 5 times the value of SW (Helical Spring Lock Washer) No.3 (TOKUHATSU product) |
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| Even distribution of reactive tension | ||||||||
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| Effective in preventing screw loosening | ||||||||||
| SPAK, with high reactive tension, is effective in preventing screw loosening. The ratio of reduction in initial tightening force is 2/3 that of SW. |
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| Light weight |  |
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| SPAK's sectional area is smaller than that of SW. 64% that of SW No.2 (TOKUHATSU product) 52% that of SW No.3 (TOKUHATSU product) |
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| Requiring only short bolts | ||||||||||
| Washer is thin. Requiring only a small effective bend Only a small incompletely screwed portion, permitting tightening of thin plate (in case of screw and washer assemblies) A design permitting bolt weight reduction |
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| Distance between washer surface and completely screwed portion (mm) (source: JASO F109-91) |
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| SPAK shown in the catalog are available in the following materials and finishes | |||||||
| Material and Hardness CARBON STEEL = SWRH57~77 (JIS G3506) HRC40~48 AUSTENIC STAINLESS STEEL = SUS304 (JIS G4308) >HRC35 |
Finishes ELECTRO COATING OF ZINC ON STEEL ZINC HOT DIP GALVANIZINGS CHROMATE CONVERSION COATINGS PHOSPHATE COATINGS NICKEL PLATING COPPER PLATING |
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| FOR SCREW AND WASHER ASSEMBLIES | |||||||
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| TOKUHATSU offers curved and wave spring lock washers meeting specification DIN 128, 6905. | |||||||
| TOKUHATSU helical spring lock washers meet major requirements of JIS (Japanese Industrial Standards) B1251. Products meeting the requirements of ASME, DIN etc. are also available. |
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| FOR SCREW AND WASHER ASSEMBLIES | ||||
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| The helical spring lock washers shown in this catalog are available in the following materials and finishes |
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| Material and Hardness CARBON STEEL = SWRH57~77 (JIS G3506) HRC42~50 AUSTENIC STAINLESS STEEL = SUS304, 305, 316 (JIS G4308) >HRC35 PHOSPHOR BRONZE = C5191 (JIS H3270) >HRB90 TITANIUM = TW270~340 (JIS H4670) >HRC20 |
Finishes ELECTRO COATING OF ZIN ON STEEL ZINC HOT DIP GALVANIZINGS CHROMATE CONVERSION COATINGS PHOSPHATE COATINGS NICKEL PLATING COPPER PLATING |
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| FOR HEXAGON SOCKET HEAD CAP SCREWS | ||||||
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| FOR FISH PLATES (JIS E1115) | ||||||
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