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Types and Sizes of Beading Thread and Stringing Material

See how a variety of beading and jewelry-making threads and light-duty cords measure up. Easy-to-use chart includes thread diameter in inches and millimeters for nylon, silk, FireLine® and more.

Applications of Stringing Material
Beads with smooth drill holes (amber, coral, etc.) Silk, polyester or nylon
Beads with abrasive drill holes FireLine® thread, polyester or nylon
Beads that are metal, large or have large drill holes *Accu-Flex®, *FireLine, Acculon® or *Tiger Tail™
Pearls Silk thread
Ropes or Woven Necklaces Nylon
*This is a smooth woven type of wire that is flexible, but yet will resist cutting or breaking, and is used to string heavy crystal and metal beads. The sharp edges and heavy weight of these types of beads will cut regular threading cord.

Silk

Colored American Silk
Thickest to thinnest: FFF, FF, F, E only

Silk on Card (white or colored)
Thickest to thinnest: 12, 10, 8, 6, 5, 4, 3

(Cord and thread sizes are listed smallest to largest.)
Inches (") Millimeters (mm) Griffin Silk Purely Silk™ Purely Silk™ with Needle Various Silk Cord
0.0050 0.1270 ... OO ... ...
0.0060 0.1524 ... O ... ...
0.0070 0.1778 ... A ... ...
0.0080 0.2032 ... B #1-1/2 ...
0.0108 0.2743 ... C ... ...
0.0118 0.3 #0 ... ... ...
0.0120 0.3048 ... D ... ...
0.0128 0.3251 ... E #4 ...
0.0137 0.3480 ... F ... ...
0.01378 0.35 #1 ... ... ...
0.015 0.381 ... FF ... ...
0.0165 0.4191 ... FFF #8 ...
0.0177 0.45 #2 ... ... ...
0.01969 0.5 #3 ... ... ...
0.02362 0.6 #4 ... ... ...
0.02559 0.65 #5 ... ... ...
0.02756 0.7 #6 ... ... ...
0.02953 0.75 #7 ... ... ...
0.0315 0.8 #8 ... ... ...
0.03543 0.9 #10 ... ... ...
0.03858 0.98 #12 ... ... ...
0.0393 1 ... ... ... Imitation Silk Cord
0.04016 1.02 #14 ... ... ...
0.04134 1.05 #16 ... ... ...
(Cord and thread sizes are listed smallest to largest.)
Inches (") Millimeters (mm) C-Lon® Cord C-Lon Thread Griffin NylonPower Nymo® Spectra® Parachute Cord Silkon® Various NylonThread
0.004 0.1016 ... ... ... ... 18-Pound ... ...
0.005 0.127 ... ... ... OO ... ... ...
0.006 0.1524 ... AA ... O 30-Pound ... ...
0.007 0.1778 ... ... ... ... ... #1 ...
0.008 0.2032 ... ... ... B ... ... Sono
0.0098 0.25 ''Micro Weight'' ... ... ... ... ... Sono
0.0108 0.2743 ... ... ... ... ... #2 ...
0.0118 0.3 ... ... #0 ... ... ... ...
0.012 0.3048 ... D ... D 50-Pound #3 ...
0.01378 0.35 ... ... #1 ... ... ... ...
0.0157 0.4 ''Fine Weight'' ... ... ... ... ... ...
0.0177 0.45 ... ... #2 ... ... ... ...
0.01969 0.5 ''Standard Weight'' ... #3 ... ... ... ...
0.02362 0.6 ... ... #4 ... ... ... ...
0.02559 0.65 ... ... #5 ... ... ... ...
0.02756 0.7 ... ... #6 ... ... ... ...
0.02953 0.75 ... ... #7 ... ... ... ...
0.0315 0.8 ... ... #8 ... ... ... ...
0.03543 0.9 ''Heavy Weight'' ... #10 ... ... ... ...
0.03858 0.98 ... ... #12 ... ... ... ...
0.04016 1.02 ... ... #14 ... ... ... ...
0.04134 1.05 ... ... #16 ... ... ... ...
(Cord and thread sizes are smallest to largest.)
Inches (") Millimeters (mm) FireLine Satinique™ Translucent Cords and Threads Various Monofilament Thread
0.0019 0.05 ... ... ... Kevlar® 6-Pound
0.0023 0.06 1-Pound ... ... ...
0.0031 0.08 2-Pound ... ... ...
0.0039 0.1 3-Pound ... Spiderwire® 6-Pound ...
0.005 0.13 4-Pound ... ... ...
0.0059 0.15 6-Pound ... ... ...
0.0071 0.18 8-Pound ... Spiderwire 8-Pound ...
0.0078 0.2 10-Pound ... ... Kevlar 7-Pound
0.009 0.23 14-Pound ... ... ...
0.0098 0.25 ... ... Invizi™-Cord ...
0.0118 0.3 20-Pound ... ... ...
0.0393 1 ... Mini ... ...
0.59 1.5 ... Small ... ...
0.787 2 ... Regular ... ...
0.1574 4 ... Large ... ...

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