Howmet/Huck, blind rivet
Huck Magna-Lok (industrial)
Howmet's industrial Magna-Lok blind rivet: hole filling, mechanically locked pin.
- Shear 22-54 ksi
- Access Blind (one-sided)
- Diameters 3/16 to 1/2"
- Materials Carbon steel, Aluminum +1
- Lead-time risk Low
Blind (one-sided), pulled-stem blind rivet: “As the tool pulls on the pintail, the pin (mandrel) expands the sleeve and begins drawing the work pieces together.” (Howmet Huck Magna-Lok brochure, p.3, Installation Sequence)
- Shear
- 22-54 ksi
- Blind bulb
- standard
- Install
- One-side install
- Diameters
- 3/16, 1/4, 3/8, 1/2"
- Lead-time risk (SpecLok assessment)
- Low
This is a commercial/industrial fastener: it isn't procured to a NAS, NASM, MS or AS standard and has no published MMPDS allowables. That's fine for many non-flight uses. How industrial and aerospace fasteners differ
Typical applications
- ·Industrial and transportation structure (Howmet industrial product line)
- ·Ground support equipment, tooling, non-flight structure
Strengths
- +Pin mechanically locked to the sleeve: "virtually eliminates pin push-out" (brochure)
- +Circle-lock forms just before the pin breaks flush (brochure)
Trade-offs
- −Industrial product: not procured to an aerospace spec, no published MMPDS allowables
- −No composite rating in the brochure
Also called MagnaLok, hole-filling blind rivet. P/N: MGL[head]-[mat][dia]-[grip] · e.g. MGLP-R6-4
Datasheet strength: Installed min shear 600 lb (Al) / 1,300 lb (steel) at 3/16"; lbf not ksi: Huck Magna-Lok brochure.
Standards
- Howmet commercial Magna-Lok series (no NAS/MS spec)
Materials and galvanic compatibility vs CFRP
| Alloy | Shear | vs CFRP | Notes | Source |
|---|---|---|---|---|
| Carbon steel | 47 ksi | high | Steel (R). Min shear 1,300 lb (3/16") to 10,000 lb (1/2") | Derived: Magna-Lok brochure installed values ÷ nominal area = 47-54 ksi |
| Aluminum | 22 ksi | high | Aluminum (B). Min shear 600 lb (3/16") to 5,100 lb (1/2") | Derived: brochure installed values ÷ nominal area = 22-27 ksi |
| Stainless (CRES) | 47 ksi | low | 300-series stainless (U). Min shear 1,300 lb (3/16"), 2,350 lb (1/4") | Derived: brochure installed values ÷ nominal area = 47-48 ksi |
vs CFRP: MIL-STD-889C Table I, graphite column: high = incompatible in all environments; low = compatible except sea-water immersion; unrated = SpecLok has not read a rating for this material.About derived ksi
Specs source: Howmet Magna-Lok brochure ↗: Installed values table (min/typical shear, tensile, pin retention, lbf); part-number system; head styles protruding, truss, 100° flush. Lead-time risk is SpecLok's sourcing assessment, not a datasheet value.
3 head styles
Not redrawn: no head dimensions for this variant in the documents on file. The data at right is from the cited document.
Protruding Head
- MGLP: Material code: R steel, B aluminum, U stainless steel, 4U 430 stainless steel, 316U 316 stainless steel
Sizes and grip: MGL (head style)-(material)(diameter)-(grip number), e.g. MGLP-R6-4. Diameter 6, 8, 12, 16.
Source: Howmet Magna-Lok brochure, Ordering Information; head style dimension tables ↗
Head styles (manufacturer terms)
- Protruding Head (MGLP)
- Truss Head (MGLT)
- 100° Flush Head (MGL100)
Expanding sleeve · 4 steps
1/4Inserted
“Insert the fastener into the hole and slip the installation tool over the pintail.”
Howmet Huck Magna-Lok brochure, p.3, Installation Sequence ↗
Drawing traced from: Panel 1.
Official manufacturer install demonstration: Huck Magna-Lok (industrial) installation.
Installation verification and preload
Installed preload
Not published. The brochure's installed-values table covers shear, tensile, and pin retention only; clamp appears only qualitatively ("high retained clamp").
What to check after install
- Flush pin break with the sleeve head is the stated completion indicator; the circle-lock forms just before the pin breaks flush.
- No inspection dimension table or gauges are published in the brochure.
Check gauges (1) and sources.Details
- None published in the brochure; PB162/PB509 gage bulletins cover the Huck line generally.
Sources: Magna-Lok brochure (Howmet). Acceptance limits belong to the controlling spec; verify against your program's process documentation.
- Tool
- Huck Magna-Lok installation tools: pneudraulic, battery and hydraulic models (brochure tooling table)
- Special / proprietary
- Standard tooling
- Training
- Not stated in the cited documents.
- Inspection
- Pin breaks flush (brochure).
"As the tool pulls ... draws the hollow pin head inside ... a solid circle lock between the pin and sleeve is formed just before the pin breaks flush" (brochure).
The published install tool and nose for each size, other access options, and the gauges that check the install, from the manufacturer's own tool tables.
| Dia. | Published tool + nose | Other access | Gauges |
|---|---|---|---|
| -6 | 256 + 99-3327 | None published | None published |
| -8 | 256 + 99-3328 | None published | None published |
| -12 | 256 + 99-3318 | None published | None published |
| -16 | 2583 + 99-3330 ("Not for use with steel fasteners, aluminum only") | None published | None published |
Full tool tables, envelopes, clearances and source notesCompare tooling burden across all 25 families
Removal
No published removal procedure found; follow the manufacturer's instructions. Manufacturer page ↗
P/N series MGL[head]-[mat][dia]-[grip] · e.g. MGLP-R6-4Paste a full part number into the decoder.
- Manufacturer
- Howmet/Huck
- Category
- Blind rivet
- Datasheet (PDF) ↗
- Manufacturer page ↗
- Howmet Magna-Lok brochure ↗: Installed values table (min/typical shear, tensile, pin retention, lbf); part-number system; head styles protruding, truss, 100° flush.
Find the part number for your stack
SpecLok has no dash-number table for this family yet: the quote line goes out as the family, part number to be confirmed.
Sourcing
Lead-time risk (SpecLok sourcing assessment): Low
Get quotes: SpecLok sources this from authorized distributors and returns price, lead time and certs.You buy from the authorized distributor, who is named on your returned quote. SpecLok is free for buyers.
Supply signalfor this family
- No FLIS records linked to this family yet.
- 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 2026-09-28.
Image credits: Howmet Aerospace, Magna-Lok® brochure, p.1 ↗. Product images belong to their manufacturers.
Sources (7)
- Howmet Huck Magna-Lok brochure
- Howmet/Huck product page
- Huck Magna-Lok (industrial) installation video
- MIL-STD-889C Table I, graphite column: high = incompatible in all environments; low = compatible except sea-water immersion; unrated = SpecLok has not read a rating for this material.
- DLA FLIS Data Electronic Reading Room (PUB LOG)
- DLA PUB LOG
- USAspending.gov award search API
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