Belleville Lock Assembly Washer Option

Available in steel or stainless steel for all captive panel screws (any head style or thread size)   The Belleville washer material for steel screws is Heat Treated Spring Steel QQ-S-700/ASTM A 684   The Belleville material for stainless steel screws is Stainless Steel Type 301-304   Standard fastener products having a class 2A thread, once plated, may not enter 2A GO and NO-GO Gages.     Thread     I.D.     'B'     O.D.     'A'     Thickness     'C'     Height     'H'     Bellville     Washer     Number     2-56   .078   .150   .008   .028   24007   4-40   .097   .203   .010   .030   24023   6-32   .119   .200   .005   .030   24043   8-32   .156   .312   .025   .040   24087 (I.D. .156)     10-32   .173   .365   .015   .035   24105   1/4-20   .234   .562   .030   .050   24165 (I.D. .234)     3/8-16   .334   .620   .015   .080   24231   FINISHES 1 No finish NO FINISH 6 Cadmium Plate Clear CADMIUM PLATE 00-P-416-F-Type I-Class 2-Clear Chromate 7 Cadmium Commercial Plate, CADMIUM PLATE COMMERCIAL - Type I, Class 3" 8 Cadmium Color Chromate Plate CADMIUM PLATE 00-P-416-F-Type II - Class 3 - Color Chromate Finish 9 Nickel Plate, Grade G NICKEL PLATE - QQN-290-A-Class 1, Grade G, (thickness - .0002- SB) (single layer coating fully bright) 11 Black oxide, Class 4 BLACK OXIDE - MIL-C-13924-C-AMEND #1 Class 4. For 300 series corrosion resistance steel alloys only. 12 Passivate, Type I PASSIVATE - MIL-F-14072-C (ER) AMEND #1 - Type I. (Finish #E300 - Passivate per ASTM-A-380-96) 20 Tin Type II "TIN PLATE (Electro Deposit) MIL-T-10727-C, Type I" 31 Zinc Plate Type I ZINC PLATE - ASTM B633185 Type I - Class FEIZN5-SC-I (thickness .00025) 31a Zinc Plate Type II ZINC PLATE - Colored Chromate - ASTM B633185 Type II - FEIZN5- SC-1 (thickness -.00025) 32 Solder Plate .0003-.0001 Thick (Solder per QQ-S-571, Sn60) over Nickel Plat .0001-.0005 ZINC PLATE - Colored Chromate - ASTM B633185 Type II - FEIZN5- SC-1 (thickness -.00025)