Dimensional Specifications (mm)

Size	P	s_max	s_min	k_nominal
12	17	20	80	20
16	25	30	125	30
20	37	45	180	40
24	50	63	250	50
30	66	80	315	60
36	74	90	355	65
42

Standard Versions

GB /T 17116.3 - 2018—
HG /T 21573.4 - 1995— Spherical Washers

Surface Treatment Recommendations

Zinc Plating (Zn)

Standard corrosion protection for indoor and mild outdoor environments.

Salt spray: 96–200 hours | RoHS compliant (trivalent chromium)

Zinc-Nickel Alloy (Zn-Ni)

High-performance coating for automotive, marine, and harsh environments.

Salt spray: 720–1500 hours | Recommended for grade 8.8+

Hot-Dip Galvanizing

Heavy-duty protection for structural and outdoor applications.

Salt spray: 500–1000 hours | Thread tolerance adjustment required

Note for high-strength fasteners (Grade 10.9, 12.9): Electroplating processes require hydrogen embrittlement relief baking (minimum 4 hours at 200°C within 4 hours of plating). Contact our engineering team for grade-specific plating recommendations.

Technical Specifications & Availability

Request detailed technical specifications, material certifications, and availability information for your application requirements. Our engineering team can provide product recommendations, custom specifications, and technical documentation.

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Technical Support Available

Material Certifications

Custom Specifications

Size	P	s_max	s_min	k_nominal
12	17	20	80	20
16	25	30	125	30
20	37	45	180	40
24	50	63	250	50
30	66	80	315	60
36	74	90	355	65
42

Size	P	s_max	s_min	k_nominal
12	17	20	80	20
16	25	30	125	30
20	37	45	180	40
24	50	63	250	50
30	66	80	315	60
36	74	90	355	65
42

Size	P	s_max	s_min	k_nominal
12	17	20	80	20
16	25	30	125	30
20	37	45	180	40
24	50	63	250	50
30	66	80	315	60
36	74	90	355	65
42