screws 157 1-888-208-2008 fax (973) 244-9177 www.accuratescrew.com screws internal tooth lock washers 903133 2 .175 .200 .089 .095 .010 .015 903135 4 .255 .270 .115 .123 .015 .019 903137 6 .275 .295 .141 .150 .017 .021 903139 8 .325 .340 .168 .176 .018 .023 903141 10 .365 .381 .195 .204 .020 .025 903143 1/4 .460 .478 .256 .267 .023 .028 903145 5/16 .594 .610 .320 .332 .028 .034 903147 3/8 .670 .694 .384 .398 .032 .040 903149 7/16 .740 .789 .448 .464 .032 .040 basic p art number normal wash er size a od min max b id min max c thickness min max external tooth lock washers split lock washers *american standard washer width is approximate. s spring steel hrc 42-47 ss stainless steel, type 304 metric available material (see page 276) s spring steel hrc 42-47 ss stainless steel, type 304 metric available material (see page 276) s spring steel hrc 44-51 ss stainless steel, type 304 or 316 metric available material (see page 276) s spring steel hrc 42-47 ss stainless steel, type 304 b phosphorus bronze conforming to asm b159 copper alloy no. 510 american standard available material (see page 276) 903180 m2 4.40 4.70 2.25 2.40 .25 .35 903181 m2.5 5.35 5.45 2.65 2.80 .25 .35 903183 m3 6.85 7.35 3.15 3.30 .35 .50 903184 m3.5 7.55 8.05 3.65 3.80 .40 .55 903185 m4 8.25 8.75 4.15 4.30 .45 .60 903186 m5 10.00 10.50 5.15 5.30 .55 .70 903187 m6 12.20 12.95 6.20 6.50 .55 .70 basic p art number normal wash er size a od min max b id min max c thickness min max not avail. 2 903132 4 .245 .260 .115 .123 .015 .019 903134 6 .305 .320 .141 .150 .016 .022 903136 8 .365 .381 .168 .176 .018 .023 903138 10 .395 .410 .195 .204 .020 .025 903140 12 .460 .475 .221 .231 .023 .028 903142 1/4 .494 .510 .256 .267 .023 .028 903144 5/16 .588 .610 .320 .332 .028 .034 903146 3/8 .670 .694 .384 .398 .032 .040 903148 7/16 .740 .760 .448 .464 .032 .040 basic p art number normal wash er size a od min max b id min max c thickness min max 903188 m2 2.25 2.40 .25 .35 903189 m2.5 5.45 5.85 2.65 2.80 .25 .35 903190 m3 6.85 7.35 3.15 3.30 .35 .50 903191 m3.5 7.55 8.05 3.65 3.80 .40 .55 903192 m4 8.50 9.00 4.15 4.30 .45 .60 903193 m5 10.00 10.50 5.15 5.30 .50 .65 903194 m6 12.20 12.95 6.20 6.50 .55 .70 basic p art number normal wash er size a od min max b id min max c thickness min max 903150 2 .172 .088 .094 .035 .020 903152 4 .209 .115 .121 .040 .025 903154 5 .236 .128 .134 .047 .031 903156 6 .250 .141 .148 .047 .031 903158 8 .293 .168 .175 .055 .040 903160 10 .334 .194 .202 .062 .047 903162 12 .377 .221 .229 .070 .056 903164 1/4 .489 .255 .263 .109 .062 903166 5/16 .586 .318 .328 .125 .078 903168 3/8 .683 .382 .393 .141 .094 903170 7/16 .779 .446 .459 .156 .109 basic p art number normal wash er size a od max 2 b id min max wc w asher section width* thickness approx. 903195 m2 4.4 2.1 .5 903196 m2.5 5.1 2.6 .6 903197 m3 6.2 3.1 .8 903198 m3.5 6.7 3.6 .8 903199 m4 7.6 4.1 .9 903200 m5 9.2 5.1 1.2 903201 m6 11.8 6.1 1.6 basic p art number screw dia a od b id c thickness lock washers metric standard metric standard metric standard ss teel (1008) ss stainless steel (18-8) bs ilicone bronze conforming to asm b99 copper alloy 651 or 655 american standard available material (see page 276) s spring steel hrc 42-47 ss stainless steel, type 304 b phosphorus bronze conforming to asm b159 copper alloy no. 510 american standard available material (see page 276) order example: 903 1 33 basic p art number 32 finish: see page 278 - s material: see chart -
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