#8-32 x 3/8" Phillips Pan Head Zinc Finish Steel External Tooth Washer SEMS Machine Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.259 INCHES MINIMUM AND 0.357 INCHES MAXIMUM FASTENER LENGTH: 0.375 INCHES NOMINAL HEAD STYLE: C33 PAN NO. 2 HEAD DIAMETER: 0.306 INCHES MINIMUM AND 0.322 INCHES MAXIMUM HEAD HEIGHT: 0.085 INCHES MINIMUM AND 0.096 INCHES MAXIMUM WASHER QUANTITY: 1 INTERNAL DRIVE STYLE: D1 CROSS RECESS TYPE 1 NOMINAL THREAD DIAMETER: 0.164 INCHES THREAD QUANTITY PER INCH: 32 HARDNESS RATING: 40.0 ROCKWELL C MINIMUM PRIMARY WASHER AND 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER OUTSIDE DIAMETER: 0.305 INCHES MINIMUM AND 0.320 INCHES MAXIMUM PRIMARY WASHER STYLE: G1 FLAT EXTERNAL TEETH PRIMARY WASHER MATERIAL THICKNESS: 0.018 INCHES MINIMUM AND 0.023 INCHES MAXIMUM MATERIAL: STEEL OVERALL SURFACE TREATMENT: CADMIUM OVERALL OR ZINC SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OVERALL OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE THREAD SERIES DESIGNATOR: UNC