lw29-1

  • Provide exceptional holding strength and withstand high torques – ideal for heavy duty applications.
  • Ribbed for rigidity under load.
  • Sharp points on periphery resist shifting
  • Internal teeth lock into bolt head or nut to prevent backoff.
  • Ideal where thick materials and high torques are involved.
Nominal
Washer Size
Hole Diameter
Min.
Hole Diameter
Max.
Across Flats
Min.
Across Flats
Max.
Across
Corners
Minimum Height Thickness WT./M WCL Part
Number
Cross
Reference
1/4 0.252 0.258 0.74 0.76 0.866 0.18 0.078 8.55 PYRM-0250-14-01 4914-14-01
5/16 0.32 0.332 0.74 0.76 0.866 0.145 0.062 0.701 PYRM-0312-14-01 4918-14-01
5/16 0.32 0.332 0.99 1.01 1.15 0.200 0.078 13.53 PYRM-0312-18-01 4918-18-01
3/8 0.384 0.398 0.99 1.01 1.15 0.13 0.062 12.1 PYRM-0375-18-01 4920-18-01
3/8 0.384 0.398 1.24 1.26 1.41 0.27 0.109 36.18 PYRM-0375-23-01 4920-23-01
7/16 0.454 0.468 1.24 1.26 1.41 0.27 0.109 34 PYRM-0437-23-01 4922-23-01
7/16 0.446 0.45 1.355 1.375 1.576 0.195 0.093 35.71 PYRM-0437-25-01 4922-25-01
1/2 0.512 0.529 1.24 1.26 1.41 0.195 0.109 31.95 PYRM-0500-23-01 4924-23-01
1/2 0.512 0.529 1.355 1.375 1.576 0.21 0.093 32.26 PYRM-0500-25-01 4924-25-01
1/2 0.512 0.529 1.355 1.375 1.576 0.19 0.093 33.06 PYRM-0500-25-02 4924-25-02
1/2 0.512 0.529 1.355 1.375 1.576 0.24 0.093 34.00 PYRM-0500-25-03 4924-25-03