Hi-Lok, LISI
HL19-12-4
Hi-Lok pin and collar (Hi-Shear): the collar wrenching device shears off at installation.
- Head 100° flush shear head
- Diameter 3/8" (-12)
- Grip .1875-.250"
- Material Alloy steel
- Lead-time risk Low
| Family | Hi-Lok (LISI) |
|---|---|
| Head style | 100° flush shear head (source: Hi-Shear HL11 / HL19 drawing title blocks, title blocks) |
| Nominal diameter | 3/8" (-12) |
| Grip | max grip 0.250" (-04 = 4/16") |
| Material | Alloy steel |
Decoded from the published numbering scheme; not a claim that this exact dash number is a stocked SKU.
Reference only: the controlling drawing, its process spec and the manufacturer's installation instructions govern. How to use these answers
Series and strength (datasheet)
HL10 / HL18 protruding shear head · HL11 / HL19 100° flush shear head · typical collars HL70, HL79, HL82, HL94, HL97
HL10: 6Al-4V titanium, 95,000 psi shear minimum; HL18: alloy steel, 95,000 psi shear (160,000-180,000 psi tensile): Hi-Shear drawings (Hi-Lok Product Specification 342).
Datasheet (PDF) ↗Other head styles, same diameter and grip
- HL10-12-4 protruding shear head
HL19 grip chart: 3/8" (-12)
Every catalogued max-grip dash number at this diameter. Stack thickness must fall inside the fastener's grip range: see the design calculators.
Other diameters at this grip:
Pin and collar · 5 steps
1/5Pin inserted
“Insert the pin into the prepared non-interference fit hole.”
Hi-Shear Hi-Lok and Hi-Lok/Hi-Tigue Installation Instructions, p.10, I.1 a ↗
Drawing traced from: a.
Source images (4): patent and government drawings
A patent drawing shows the patented design, which can differ in detail from today's catalog part. Each image says why it is tied to this family.
Required tooling, every brand
HL19-12-4 (Hi-Lok, 3/8"): the process document lists these tools for this size.
- Hi-Lok adaptor toolsStandard power or hand tools with Hi-Lok adaptor toolsHi-Shear Hi-Lok and Hi-Lok/Hi-Tigue Installation Instructions p.7 ↗
- HLH311Hand Tool AssemblyHi-Shear Hi-Lok and Hi-Lok/Hi-Tigue Installation Instructions p.9 ↗
No per-size tool and nose table is on file for this family: see Sources.
Sources2
- Hi-Shear Hi-Lok and Hi-Lok/Hi-Tigue Installation Instructions, p.7, H. Tooling ↗
- "Hi-Lok adaptors tools are fitted to high speed, pistol grip and ratchet wrench drivers in straight, 90°, offset, extension and automatic collar-feed configurations. Refer to Hi-Shear Corporation's Hi-Lok/Hi-Tigue Tool Catalog for a complete description of a wide variety of Hi-Lok drivers and accessories."
- Hi-Shear Hi-Lok and Hi-Lok/Hi-Tigue Installation Instructions, p.9, H.3 Hand Tools ↗
- "The Hi-Lok fastener may be installed with hand tools, Allen hex keys and open-end or ratchet type wrenches."
Not documented
- The Hi-Lok process document names tools for this size but prints no per-size tool and nose (adaptor) table; the maker's tool catalog it points to is not on file.
Diameter -12 (3/8"): decoded from the part number.
Tool catalogs are the manufacturers' as published in the cited edition; confirm current PNs with the tool maker before purchase. Install per the OEM process specification.
Install tooling
Decode details
| Series | Hi-Lok pin HL19 |
|---|---|
| Decode confidence | high |
| Numbering source | Hi-Shear HL10 drawing sheet 2 (Code) |
- "First dash number indicates nominal diameter in 1/32nds. Second dash number indicates maximum grip in 1/16ths." (HL10 sheet 2)
- No finish-code letters present.
- Head and material from the drawing title block.
- Collars are separate part numbers (HL10 lists typical collars HL70, HL79, HL82, HL94, HL97).
Government reference cross-reference (DLA FLIS)
HL19-12-4 is not listed in FLIS under this exact part number (FLIS data as of 2025-03-18, March 2025 snapshot). FLIS may record it with a material or finish code, or under the standard part number.
Source: DLA PUB LOG ↗. Search any part number in the decoder.
- Hi-Lok by LISI, pin and collar
- Datasheet (PDF) ↗
- Manufacturer page ↗
- Numbering: Hi-Shear HL10 drawing sheet 2 (Code) ↗
Lead-time risk for this family (SpecLok sourcing assessment): Low
Supply signal
Supply signalfor this part number
- Not listed in FLIS under this exact part number (March 2025 snapshot).
- No SpecLok quotes yet.
A signal from records SpecLok holds, not availability, stock or a lead-time promise. FLIS lists who has recorded a part number for the item, not who makes it today. DoD awards carry no NSN or part number, so award activity is for the item name's class.
Sources: DLA FLIS Data Electronic Reading Room (PUB LOG) ↗, DLA PUB LOG ↗, USAspending.gov award search API ↗; DoD award data 2025-10-01 to 2026-07-06; compiled 2026-10-02.
Image credits: LISI AEROSPACE, HI-LOK™ and HI-LITE™ Fasteners product page, gallery ↗. Product images belong to their manufacturers.
Sources
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