Split Bolt Cross-Reference Chart: Burndy KS, ILSCO IK, Blackburn H, NSI N-Series
Sep 01, 2026
Copper split bolts are a commodity, but the catalog numbers are not interchangeable across brands — each family cuts its size breaks a little differently. This chart maps the Conversions Tech 610-series copper split bolts to the four families most often written into specs: Burndy SERVIT® Type KS, ILSCO Type IK / IK-N, Blackburn (ABB) Type H, and NSI N-series. Ranges are the manufacturer's published equal main and tap range; min-tap and torque are from the same datasheets.
Cross-reference chart — copper split bolts
| CT Part | Equal main & tap | Min tap | Burndy KS | ILSCO IK | Blackburn H | NSI | Torque (in-lb) |
|---|---|---|---|---|---|---|---|
| 610-00812 | 8 STR–12 SOL | 16 | KS15 | IK-8N (IK-8) | 8H, 8H3 | N-8* | 80 |
| 610-00610 | 6 SOL–10 SOL | 16 | KS17, KS17-3 | IK-6N (IK-6) | 6H3, 6H | N-6 | 165 |
| 610-0048 | 4 SOL–8 SOL | 16 | KS20 | IK-4N (IK-4) | 4H | N-4* | 165 |
| 610-00261 | 2 STR–6 SOL | 14 | KS22, KS23 | IK-2N (IK-2) | 1H | N-2* | 275 |
| 610-00104 | 1/0 STR–4 SOL | 14 | KS25 | IK-1/0N (IK-1/0) | 10H | N-1/0* | 385 |
| 610-00204 | 2/0 STR–2 SOL | 14 | KS26 | IK-2/0 | 20H | N-2/0* | 385 |
| 610-00302 | 3/0 STR–2 SOL | 12 | KS27 | IK-3/0 | 30H | N-3/0* | 500 |
| 610-25001 | 250 kcmil–1/0 | 10 | KS29 | IK-250 | 40H | N-250 | 650 |
| 610-35040 | 350 kcmil–4/0 | 8 | KS31 | IK-350 | 350M | N-350* | 650 |
| 610-00500 | 500–250 kcmil | 8 | KS34 | IK-500 | 500M | N-500* | 825 |
* NSI catalog number follows the family's max-size naming (verified on N-6 and N-250); confirm range on the NSI datasheet for critical work. Blackburn 30H (4/0–2), 350M (350–250) and 500M (500–400) are the nearest Type H sizes and differ slightly in range from the CT part. Torque values are UL 486A-class figures for the maximum conductor combination; follow the marking on the connector in hand.
How the families differ
- Burndy KS numbers its bodies by an internal code (KS15…KS44) rather than conductor size; the -3 suffix (KS17-3, KS20-3, KS22-3) takes three conductors and is not UL listed.
- ILSCO IK numbers by maximum conductor. The IK-N line (IK-10N through IK-1/0N) is the current small-size design with a shaped pressure pad; the legacy IK-6 / IK-4 / IK-2 / IK-1/0 numbers still appear in specs. Our 610-series ranges mirror the IK family size for size.
- Blackburn Type H is copper-through-4/0 ("H") and copper-alloy above ("M"). H3 variants take three wires. Type HPS/HPW are the plated, spacer-equipped dual-rated versions for Cu/Al work.
- NSI N-series numbers by maximum conductor, same convention as ILSCO.
What crosses and what doesn't: a copper-alloy split bolt crosses to another copper-alloy split bolt of the same range. It does not cross to a dual-rated (Cu/Al) body — Burndy KSU, ILSCO SK, Blackburn HPS — which have spacers and different listings. If the spec calls for a dual-rated part, cross within that class.
Selection, torque, insulation, and code limits are covered in Split Bolt Connectors: Sizing, Torque, Taping, and Where the NEC Won’t Let You Use One. Product pages: Copper Split Bolt Connectors.
