Howmet/Huck, lockbolt (swaged collar)
Huck Magna-Grip (industrial)
Howmet's industrial Magna-Grip lockbolt: wide grip range, published installed clamp.
- Shear 24-62 ksi
- Access Two-sided
- Diameters 3/16 to 3/8"
- Materials Carbon steel, Aluminum
- Lead-time risk Medium
Two-sided, lockbolt (swaged collar): “The fastener pin is inserted through a prepared hole. The precision collar is placed over the other end.” (Howmet Huck Magna-Grip brochure, p.3, Installation Sequence)
- Shear
- 24-62 ksi
- Blind bulb
- n/a
- Install
- Both sides needed
- Diameters
- 3/16, 1/4, 5/16, 3/8"
- Lead-time risk (SpecLok assessment)
- Medium
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 lockbolts)
- ·Ground support equipment, tooling, non-flight structure
Strengths
- +"Wide grip range for each diameter" (brochure)
- +Installed clamp (min / typical) published per size (brochure)
Trade-offs
- −Industrial product: not procured to an aerospace spec, no published MMPDS allowables
- −Needs access to both sides
- −Huck installation tool
Also called MagnaGrip, wide-grip lockbolt. P/N: MGP[head]-[mat][dia]-[grip] + collar MGC… · e.g. MGPB-R8-10G
Datasheet strength: Installed min shear 750 lb (Al) / 1,725 lb (steel) at 3/16"; lbf not ksi: Huck Magna-Grip brochure.
Standards
- Howmet commercial Magna-Grip series MGP (no NAS/MS spec)
Materials and galvanic compatibility vs CFRP
| Alloy | Shear | vs CFRP | Notes | Source |
|---|---|---|---|---|
| Carbon steel | 38 ksi | high | Steel (R). Min shear 1,725 lb (3/16") to 4,200 lb (3/8") | Derived: Magna-Grip brochure min shear ÷ nominal area = 38-62 ksi |
| Aluminum | 24 ksi | high | Aluminum (E). Min shear 750 lb (3/16") to 3,000 lb (3/8") | Derived: brochure min shear ÷ nominal area = 24-29 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-Grip brochure ↗: Installed values (shear, tensile, clamp; min/typical, lbf) 3/16"-3/8"; part-number system: button, truss, broad-truss heads. Lead-time risk is SpecLok's sourcing assessment, not a datasheet value.
6 head styles
Not redrawn: no head dimensions for this variant in the documents on file. The data at right is from the cited document.
Button Head
- MGPB: Material code: R steel, E aluminum
Sizes and grip: MGP (head style)-(material)(diameter)-(grip number)(finish), e.g. MGPB-R8-10G.
Source: Howmet Magna-Grip brochure, Head Style Options; Ordering Information ↗
Head styles (manufacturer terms)
- Button Head (MGPB)
- Truss Head (MGPT)
- Broad Truss Head (MGP30)
- Rivet Head (MGP98T)
- Stainless Encapsulated Head (MGPTC)
- 90° Flush Head (MGP90)
Pin and collar · 4 steps
1/4Pin inserted, collar placed
“The fastener pin is inserted through a prepared hole. The precision collar is placed over the other end.”
Howmet Huck Magna-Grip brochure, p.3, Installation Sequence ↗
Drawing traced from: Panel 1.
Official manufacturer install demonstration: Huck Magna-Grip (industrial) installation.
Installation verification and preload
Installed preload
- Installed clamp, aluminum pin (min/typ): 3/16": 550/800 lb · 1/4": 950/1,400 lb · 5/16": 1,600/2,200 lb · 3/8": 2,400/3,200 lb
- Installed clamp, steel pin (min/typ): 3/16": 1,025/1,500 lb · 1/4": 1,350/2,000 lb · 5/16": 2,300/2,900 lb · 3/8": 3,200/4,000 lb
Installed values in nominal grip, from the Huck Magna-Grip brochure. One of the few families that publishes clamp directly.
What to check after install
- Core pin flush with the collar = properly installed (visual completion criterion).
- Lock witness marks: up to two within the collar acceptable; three is a reject.
- Installed-collar inspection dimensions per diameter (brochure Inspection Data table): e.g. A max .062"-.250" by size.
Check gauges (1) and sources.Details
- Huck grip and pin-position/swage gages per Product Bulletins PB162 and PB509 (per-diameter gage tables not freely retrievable; confirm gage PN with Howmet).
Sources: Magna-Grip brochure (Howmet) · HFS tooling catalog (PB162/PB509). Acceptance limits belong to the controlling spec; verify against your program's process documentation.
- Tool
- Huck installation tool (brochure)
- Special / proprietary
- Special tooling · proprietary
- Training
- Not stated in the cited documents.
- Inspection
- Core pin flush with collar; lock witness marks (see verification below).
"When the tool is activated, it pulls" the pin; the collar is swaged into the pin grooves and the pintail is "tensioned off, 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 | BV4500-118 + 99-3201 | None published | None published |
| -8 | BV4500-118 + 99-3204 | None published | None published |
| -10 | 2581 + 99-1439 | None published | None published |
| -12 | 2581 + 99-1440 | 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 MGP[head]-[mat][dia]-[grip] + collar MGC… · e.g. MGPB-R8-10GPaste a full part number into the decoder.
- Manufacturer
- Howmet/Huck
- Category
- Lockbolt (swaged collar)
- Datasheet (PDF) ↗
- Manufacturer page ↗
- Howmet Magna-Grip brochure ↗: Installed values (shear, tensile, clamp; min/typical, lbf) 3/16"-3/8"; part-number system: button, truss, broad-truss heads.
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): Medium
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-Grip® brochure, p.1 ↗. Product images belong to their manufacturers.
Sources (8)
- Howmet Huck Magna-Grip brochure
- Howmet/Huck product page
- Huck Magna-Grip (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.
- HFS tooling catalog (PB162/PB509)
- DLA FLIS Data Electronic Reading Room (PUB LOG)
- DLA PUB LOG
- USAspending.gov award search API
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