Thumbnuts are knobs fitted with female threaded aluminum inserts or machine tapped plastic threads.
Try our new Extended Knurled, Tri-lobe and Machine Tapped Thumbnuts.
Available in both inch and metric. Thumbnuts are currently only available in black.
NOTE: 1/4-20, 1/4-28 and M6X1.0 Extended Knurled Thumbnuts with aluminum threaded inserts have a thread length of 0.256″/6.5mm.
Dimension Drawing PDFs






Due to the large number of combinations offered, narrow down the table results using the filters below.
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wdt_ID | Part # | Thread | Thread Material | Style | A | B | C | D | Measure Unit |
---|---|---|---|---|---|---|---|---|---|
1 | F99B-0440-0.18C | 4-40 | Aluminum | Knurled | 5/16" | 3/16" | 9/64" | 9/32" | Inch |
2 | F00B-0632-0.21C | 6-32 | Aluminum | Knurled | 3/8" | 7/32" | 11/64" | 23/64" | Inch |
3 | F01B-0832-0.26C | 8-32 | Aluminum | Knurled | 1/2" | 17/64" | 11/64" | 25/64" | Inch |
4 | F02B-1024-0.29C | 10-24 | Aluminum | Knurled | 5/8" | 19/64" | 11/64" | 29/64" | Inch |
5 | F02B-1032-0.29C | 10-32 | Aluminum | Knurled | 5/8" | 19/64" | 11/64" | 29/64" | Inch |
6 | F03B-2520-0.35C | 1/4-20 | Aluminum | Knurled | 3/4" | 23/64" | 11/64" | 17/32" | Inch |
7 | F03B-2528-0.35C | 1/4-28 | Aluminum | Knurled | 3/4" | 23/64" | 11/64" | 17/32" | Inch |
8 | F04B-2520-0.35C | 1/4-20 | Aluminum | Knurled | 1" | 23/64" | 19/64" | 9/16" | Inch |
9 | F04B-2528-0.35C | 1/4-28 | Aluminum | Knurled | 1" | 23/64" | 19/64" | 9/16" | Inch |
10 | F06B-3118-0.42C | 5/16-18 | Aluminum | Knurled | 1" | 27/64" | 19/64" | 41/64" | Inch |
11 | F06B-3124-0.42C | 5/16-24 | Aluminum | Knurled | 1" | 27/65" | 19/64" | 41/64" | Inch |
12 | F28B-0305-5.70C | M3 | Aluminum | Knurled | 9.6mm | 5.55mm | 4.36mm | 9.12mm | Metric |
13 | F29B-0407-6.60C | M4 | Aluminum | Knurled | 13mm | 6.74mm | 4.36mm | 9.92mm | Metric |
14 | F30B-0508-7.50C | M5 | Aluminum | Knurled | 16mm | 7.54mm | 4.36mm | 11.50mm | Metric |
15 | F31B-0610-9.10C | M6 | Aluminum | Knurled | 19mm | 9.12mm | 4.36mm | 13.59mm | Metric |
16 | F32B-0610-9.10C | M6 | Aluminum | Knurled | 26mm | 9.12mm | 7.54mm | 14.28mm | Metric |
17 | F33B-0812-10.7C | M8 | Aluminum | Knurled | 26mm | 10.71mm | 7.54mm | 16.27mm | Metric |
18 | X03B-0407-0.49EC | M4 | Aluminum | Extended Knurled | 19mm | 12.50mm | 4.36mm | 11.50mm | Metric |
19 | X03B-0508-0.49EC | M5 | Aluminum | Extended Knurled | 19mm | 12.50mm | 4.36mm | 11.50mm | Metric |
20 | X03B-0610-9.10C | M6 | Aluminum | Extended Knurled | 19mm | 12.50mm | 4.36mm | 11.50mm | Metric |
21 | X04B-0407-0.49EC | M4 | Aluminum | Extended Knurled | 26mm | 12.50mm | 7.60mm | 11.50mm | Metric |
22 | X04B-0508-0.49EC | M5 | Aluminum | Extended Knurled | 26mm | 12.50mm | 7.60mm | 11.50mm | Metric |
23 | X04B-0610-9.10C | M6 | Aluminum | Extended Knurled | 26mm | 12.50mm | 7.60mm | 11.50mm | Metric |
24 | TT3B-0407-0.49EC | M4 | Aluminum | Tri-Lobe | 32mm | 12.50mm | 9.65mm | 11.50mm | Metric |
25 | TT3B-0508-0.49EC | M5 | Aluminum | Tri-Lobe | 32mm | 12.50mm | 9.65mm | 11.50mm | Metric |
Thread | Thread Material | Style | Measure Unit |