HL78 at a glance
Where to buy
Specification
| Item | Value |
|---|---|
| Type | Hi-Lok collar, tension |
| Material | A-286 high-temperature alloy |
| Strength | Tension application |
| Status | Check the current issue before design use. |
Dimensions by size
| Dimension, in | 8-32UNJC-3B | 10-32UNJF-3B | 1/4-28UNJF-3B |
|---|---|---|---|
| Pin nominal diameter | 5/32 | 3/16 | 1/4 |
| A — Collar diameter (max / min) | .287 – .283 | .307 – .303 | .412 – .408 |
| B — Bore diameter (max / min) | .173 – .166 | .212 – .208 | .272 – .268 |
| L — Length | .447 – .427 | .457 – .437 | .552 – .532 |
| Thread | 8-32UNJC-3B | 10-32UNJF-3B | 1/4-28UNJF-3B |
| Collar UTS, lb min | 2,300 | 2,750 | 5,000 |
| Torque-off, in-lb | 30-40 | 40-50 | 110-130 |
Dimensions as tabulated in the catalogue, by dash number (pin nominal diameter). Max – min where a tolerance is shown.
Part numbers
Every collar dash number listed, by pin diameter.
Part number
What each code means
| Part | Meaning |
|---|---|
| Format | HL78-<dash> |
| Example | HL78-5 — 5/32 nominal pin diameter |
Notes from the standard
- 1/16 in grip variation.
- Max – min values shown as max – min. Approved data governs.
- Pins this collar is listed for in the catalogue: HL48.
Where to buy
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Sources
- HL78 — Hi-Lok Collar, Tension, A-286 High Temperature Alloy — nominal sizes and part numbers.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.