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UNC/UNF Cutting Slot Self-tapping Insert are cylindrical metal bushings featuring internal and external threads. They are specifically engineered to create their own threads while being inserted into a pre-drilled hole. Self-Tapping Inserts with cutting slot offer durable, wear-resistant threading solutions for a broad spectrum of materials, ranging from robust high-strength steels to brittle plastics. By enabling the creation of their threads, Self-Tapping Inserts eliminate the need for pre-tapped holes.
| Drawing No . | A Internal thread | E External thread | P Pitch | L Length | D Minimum borehole depth for blind holes | |
| Whitworth B.S.84 Internal Thread Tolerance: medium | L 302020 | 1/4 | 10 | 1.5 | 14 | 17 |
| L 302021 | 5/16 | 12 | 1.5 | 15 | 18 | |
| L 302022 | 3/8 | 14 | 1.5 | 18 | 22 | |
| L 302023 | 7/16 | 16 | 1.5 | 22 | 26 | |
| L 302024 | 1/2 | 18 | 1.5 | 22 | 26 | |
| L 302025 | 5/8 | 20 | 1.5 | 22 | 27 | |
| UNC Unified Coarse Thread ANSI B1.1/BS 1580 Internal Thread Tolerance:2B | L 302026 | 4-40 | 5 | 0.5 | 6 | 8 |
| L 302027 | 6-32 | 6 | 0.75 | 8 | 10 | |
| L 302028 | 8-32 | 6.5 | 0.75 | 8 | 10 | |
| L 302029 | 10-24 | 8 | 1 | 10 | 13 | |
| L 302030 | 1/4-20 | 10 | 1.5 | 14 | 17 | |
| L 302031 | 5/16-18 | 12 | 1.5 | 15 | 18 | |
| L 302032 | 3/8-16 | 14 | 1.5 | 18 | 22 | |
| L 302033 | 7/16-14 | 16 | 1.5 | 22 | 26 | |
| L 302034 | 1/2-13 | 18 | 1.5 | 22 | 28 | |
| L 302035 | 5/8-11 | 20 | 1.5 | 22 | 27 | |
| UNF Unified Fine Thread ANSI B1.1/BS 1580 Internal Thread Tolerance:2B | L 302036 | 4-48 | 5 | 0.5 | 6 | 8 |
| L 302037 | 6-40 | 6 | 0.75 | 8 | 10 | |
| L 302038 | 8-36 | 6.5 | 0.75 | 8 | 10 | |
| L 302039 | 10-32 | 8 | 1 | 10 | 13 | |
| L 302040 | 1/4-28 | 10 | 1.5 | 14 | 17 | |
| L 302041 | 5/16-24 | 12 | 1.5 | 15 | 18 | |
| L 302042 | 3/8-24 | 14 | 1.5 | 18 | 22 | |
| L 302043 | 7/16-20 | 16 | 1.5 | 22 | 26 | |
| L 302044 | 1/2-20 | 18 | 1.5 | 22 | 28 | |
| L 302045 | 5/8-18 | 20 | 1.5 | 22 | 27 | |
| Dimensions in mm, Other sizes, special designs and materials on request. | ||||||
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