Flat washers are used to protect surfaces by evenly distributing torque when a bolt or screw is tightened. A washer is a thin plate with a concentric hole that's typically used to evenly distribute the load of a threaded fastener.

For Screw Nominal Size	Hole Diameter	Outside Diameter	Washer Thickness
M1.6	1.7	4	0.3
M2	2.2	5	0.3
M2.5	2.7	6	0.5
M2.6	2.8	7	0.5
M3	3.2	7	0.5
M3.5	3.7	8	0.5
M4	4.3	9	0.8
M5	5.3	10	1
M6	6.4	12	1.6
M7	7.4	14	1.6
M8	8.4	16	1.6
M10	10.5	20	2
M12	13	24	2.5
M14	15	28	2.5
M16	17	30	3
M18	19	34	3
M20	21	37	3
M22	23	39	3
M24	25	44	4
M27	28	50	4
M30	31	56	4
M33	34	60	5
M36	37	66	5
M39	40	72	6
M42	43	78	7
M45	46	85	7
M48	50	92	8
M52	54	98	8
M56	58	105	9

Flat Washer

Application

Materials

Specification(ISO 7089)

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