An anti-loosening reaction washer for receiving counter torque generated due to tightening or loosening of a threaded fastener including: an outer edge having a geometric shape that allows for rotational coupling with a power tool; a bottom surface having friction coefficient increasing treatment means biased in areas outward from a center bore; and a top surface having friction coefficient increasing treatment means biased in areas toward the center bore, the bottom surface having an outer portion, the friction coefficient increasing treatment means being disposed about the outer portion and extending inwardly toward the center bore to a width less than the width of the bottom surface; and the top surface having an inner portion, the friction coefficient increasing treatment means being disposed about the inner portion and extending outwardly away from the center bore to a width less than the width of the top surface the outer edge defining a washer radius; the center bore defining a void radius; the bottom surface having said outer portion, the friction coefficient increasing treatment means being disposed about the outer portion and extending inwardly toward the center bore to define an inner radius which is greater than the void radius and an outer radius which is smaller than the washer radius; and the top surface having said inner portion, the friction coefficient increasing treatment means being disposed about the inner portion and extending outwardly away from the center bore to define an outer radius which is greater than the void radius but less than the washer radius. an outer edge having a geometric shape that allows for rotational coupling with a power tool; a bottom surface having friction coefficient increasing treatment means biased in areas outward from a center bore; and a top surface having friction coefficient increasing treatment means biased in areas toward the center bore, the bottom surface having an outer portion, the friction coefficient increasing treatment means being disposed about the outer portion and extending inwardly toward the center bore to a width less than the width of the bottom surface; and the top surface having an inner portion, the friction coefficient increasing treatment means being disposed about the inner portion and extending outwardly away from the center bore to a width less than the width of the top surface the outer edge defining a washer radius; the center bore defining a void radius; the bottom surface having said outer portion, the friction coefficient increasing treatment means being disposed about the outer portion and extending inwardly toward the center bore to define an inner radius which is greater than the void radius and an outer radius which is smaller than the washer radius; and the top surface having said inner portion, the friction coefficient increasing treatment means being disposed about the inner portion and extending outwardly away from the center bore to define an outer radius which is greater than the void radius but less than the washer radius. the bottom surface having said outer portion, the friction coefficient increasing treatment means being disposed about the outer portion and extending inwardly toward the center bore to define an inner radius which is greater than the void radius and an outer radius which is smaller than the washer radius; and the top surface having said inner portion, the friction coefficient increasing treatment means being disposed about the inner portion and extending outwardly away from the center bore to define an outer radius which is greater than the void radius but less than the washer radius.