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Ston Safety Washers can be made from different materials and can be                                                    supplied with different surface treatments.

Two series of Safety Washer is available:

  • “S” series

The “S” series is suitable for normal duty and available for screws of size M1.6 to M36.

  • “VS” series

The reinforced safety washer of the “VS” series is thicker, and therefore achieves higher pretensioning loads. The inner and outer diameters are the same as for the “S” series.

These washers are available for screws M5 to M36.


Available finishes:                                            Available materials:                                                

  • phosphated (Standard)                               ● Carbon steel                                                   
  • zinc-plated clear (ZC)                                 ● Stainless steel                                                
  • zinc-plated yellow (ZY)                                ●  Phosphor bronze                                              
  • stainless steel

 Special sizes and materials are also available upon request.

 The two tables below display the standard stock range available.

Article No. Order Bolt   size Di De t h h Di De t h h
Reference metric imperial 　 　 　 max. min 　 　 　 max. min
mm inch mm mm mm mm mm inch inch inch inch inch
N3001 s 1.6 1.6 　 1.7 3.2 0.35 0.6 0.38 .067 .126 .014 .024 .015
N3002 s 2 2 　 2.2 4 0.35 0.6 0.39 .087 .157 .014 .024 .015
N3003 s 2.5 2.5 　 2.7 4.8 0.45 0.9 0.49 .106 .189 .018 .035 .019
N3004 s 3 3 1/8" 3.2 5.5 0.45 0.9 0.51 .126 .217 .018 .035 .020
N3005 s 3.5 3.5 　 3.7 6 0.45 0.9 0.52 .146 .236 .018 .035 .020
N3006 s 4 4 5/32" 4.3 7 0.5 1 0.59 .169 .276 .020 .039 .023
N3007 s 5 5 3/16" 5.3 9 0.6 1.1 0.73 .209 .354 .024 .043 .029
N3008 s 6 6 　 6.4 10 0.7 1.2 0.82 .252 .394 .028 .047 .032
N3009 s 6.35 6.35 1/4" 6.7 9.5 0.7 1.2 0.79 .264 .374 .028 .047 .031
N3010 s 7 7 　 7.4 12 0.7 1.3 0.89 .291 .472 .028 .051 .035
N3011 s 8 8 5/16" 8.4 13 0.8 1.4 0.98 .331 .512 .031 .055 .039
N3012 s 10 10 3/8" 10.5 16 1 1.6 1.21 .413 .630 .039 .063 .048
N3013 s 11.1 11.1 7/16" 11.6 15.9 1 1.6 1.18 .457 .626 .039 .063 .046
N3014 s 12 12 　 13 18 1.1 1.7 1.31 .512 .709 .043 .067 .052
N3015 s 12.7 12.7 1/2" 13.7 19 1.1 1.8 1.33 .539 .748 .043 .071 .052
N3016 s 14 14 9/16" 15 22 1.2 2 1.52 .591 .866 .047 .079 .060
N3017 s 16 16 5/8" 17 24 1.3 2.1 1.63 .669 .945 .051 .083 .064
N3018 s 18 18 　 19 27 1.5 2.3 1.85 .748 1.063 .059 .091 .073
N3019 s 19 19 3/4" 20 30 1.5 2.5 1.98 .787 1.181 .059 .098 .078
N3020 s 20 　 　 21 30 1.5 2.5 1.94 .827 1.181 .059 .098 .076
N3021 s 22 22 7/8" 23 33 1.5 2.7 2.08 .906 1.299 .059 .106 .082
　 　 　 　 　 　 　 　 　 　 　 　 　 　 　
Article No. Order Bolt   size Di  De t h h Di  De t h h
Reference metric imperial 　 　 　 max. min 　 　 　 max. min
　　 mm inch mm mm mm mm mm inch inch inch inch inch
N4001 vs 5 5 3/16" 5.3 9 1 1.3 1.07 .209 .354 .039 .051 .042
N4002 vs 6 6 　 6.4 10 1 1.4 1.08 .252 .394 .039 .055 .043
N4003 vs 8 8 5/16" 8.4 13 1.2 1.7 1.32 .331 .512 .047 .067 .052
N4004 vs 10 10 3/8" 10.5 16 1.5 2 1.64 .413 .630 .059 .079 .065
N4005 vs 12 12 　 13 18 1.5 2.1 1.65 .512 .709 .059 .083 .065
N4006 vs 14 14 9/16" 15 22 1.5 2.2 1.76 .591 .866 .059 .087 .069
N4007 vs 16 16 5/8" 17 24 2 2.6 2.21 .669 .945 .079 .102 .087
N4008 vs 18 18 　 19 27 2 2.7 2.27 .748 1.063 .079 .106 .089
N4009 vs 20 20 　 21 30 2 2.8 2.34 .827 1.181 .079 .110 .092
N4010 vs 22 22 7/8" 23 33 2 3 2.42 .906 1.299 .079 .118 .095
N4011 vs 24 24 　 25.6 36 2.5 3.4 2.87 1.008 1.417 .098 .134 .113
N4012 vs 25.4 25.4 1" 27 38 2.5 3.4 2.95 1.063 1.496 .098 .134 .116
N4013 vs 27 27 　 28.6 39 2.5 3.5 2.91 1.126 1.535 .098 .138 .115
N4014 vs 30 30 1 1/8"  31.6 45 2.5 3.8 3.12 1.244 1.772 .098 .150 .123
N4015 vs 33 33 1 1/4" 34.6 50 3.00 4.5 3.65 1.362 1.969 .098 .157 .128
N4016 vs 36 36 1 3/8" 38 54 3.00 4.5 3.72 1.496 2.126 .098 .157 .146