Buckeye Fasteners, Inc. distributes weld fasteners, leg levelers and adjusting screws. Inch and metric threads are available. Fasteners in low carbon and stainless steel. Custom Multisource Fasteners
5250 West 164th Street • Brookpark, OH 44142-1597
(216) 267-2240 • FAX: (216) 267-3228
E-Mail:info@buckeyefasteners.com
A Div. of Fastener Ind., Inc.
(800) 437-1689
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Inch External Threads

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Unified Standard Class 2A (External)
Thread Size Thread Symbol Major Diameter Pitch Diameter UNR Minor
Diameter
Minimum Maximum Minimum Maximum Max. (Ref.)
# 6-32 UNC-2A .1312 .1372 .1141 .1169 .1000
# 8-32 UNC-2A .1571 .1631 .1399 .1428 .1259
#10-24 UNC-2A .1818 .1890 .1586 .1619 .1394
#10-32 UNF-2A .1831 .1891 .1658 .1688 .1519
1/4-20 UNC-2A .2408 .2489 .2127 .2164 .1894
1/4-28 UNF-2A .2425 .2490 .2225 .2258 .2064
5/16-18 UNC-2A .3026 .3113 .2712 .2752 .2452
5/16-24 UNF-2A .3042 .3114 .2806 .2843 .2618
3/8-16 UNC-2A .3643 .3737 .3287 .3331 .2992
3/8-24 UNF-2A .3667 .3739 .3430 .3468 .3243
1/2-13 UNC-2A .4876 .4985 .4435 .4485 .4069

Inch Internal Threads

Unified Standard Class 2B (Internal)
Thread Size Thread Symbol Minor Diameter Pitch Diameter Major
Diameter
Minimum Maximum Minimum Maximum Minimum
# 6-32 UNC-2B .104 .114 .1177 .1214 .1380
# 8-32 UNC-2B .130 .139 .1437 .1475 .1640
#10-24 UNC-2B .145 .156 .1629 .1672 .1900
#10-32 UNF-2B .156 .164 .1697 .1736 .1900
1/4-20 UNC-2B .196 .207 .2175 .2224 .2500
1/4-28 UNF-2B .211 .220 .2268 .2311 .2500
5/16-18 UNC-2B .252 .265 .2764 .2817 .3125
5/16-24 UNF-2B .267 .277 .2854 .2902 .3125
3/8-16 UNC-2B .307 .321 .3344 .3401 .3750
3/8-24 UNF-2B .330 .340 .3479 .3528 .3750
1/2-13 UNC-2B .417 .434 .4500 .4565 .5000