Two-sided, pin and collar (threaded): “Hand start the nut onto the pin at least 3/4 of a turn.” (Howmet Eddie-Bolt 2 process manual, p.17, Installation Sequence)

Shear: 95-125 ksi
Blind bulb: n/a
Install: Both sides needed
Diameters: 5/32, 3/16, 1/4, 5/16, 3/8"
Lead-time risk (SpecLok assessment): Medium

Typical applications

·Pin and nut joints with two-side access; clearance-fit holes recommended where titanium or composites are in the stack (process manual)

Strengths

+Nut lobes deform into the pin flutes: "positive mechanical lock" (process manual p.2)
+"FOD-free installation" (process manual p.2)
+95 to 125 KSI pin materials (process manual p.6)

Trade-offs

−Needs access to both sides (pin and nut)
−Delta-Rad driver tooling (process manual)

Also called Eddie Bolt 2, Eddie-Pin, Eddie-Nut. P/N: EL… pin / EN… nut · e.g. EL1205NN8-6Y

Datasheet strength: 95 ksi (steel/Ti/A286) up to 125 ksi (Inconel 718 / Ph13-8Mo) shear: Eddie-Bolt 2 process manual.

Standards

Howmet Eddie-Pin EL / Eddie-Nut EN series (process manual p.3-7)

Materials and galvanic compatibility vs CFRP

Alloy	Shear	vs CFRP	Notes	Source
Titanium	95 ksi	low	6Al-4V pin (code 20)	Eddie-Bolt 2 process manual p.6: 95 KSI shear
A286 CRES	95 ksi	low	A-286 pin (code 30)	Process manual p.6: 95 KSI
Alloy steel	95 ksi	high	Alloy steel pin (code 10)	Process manual p.6: 95 KSI
Inconel	125 ksi	low	Inconel 718 (code 35: 108 ksi; code 38: 125 ksi); Ph13-8Mo (code 40) also 125	Process manual p.6: 108 / 125 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

Derived ksi values are min shear ÷ nominal shank area, computed from the datasheet's lbf/kN figures; the datasheet itself publishes no ksi.

Specs source: Howmet Eddie-Bolt 2 process manual ↗: p.2 anatomy & lock; p.6-7 part-number codes (heads incl. 100°/120°/130°, materials & shear levels); p.12 hole diameters -5 to -12. Lead-time risk is SpecLok's sourcing assessment, not a datasheet value.

16 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 Shear Head

EL2: Material & strength code (p.7): 10 alloy steel 95 KSI shear, 20 6Al-4V titanium 95 KSI, 30 A-286 CRES 95 KSI, 35 Inconel 718 108 KSI, 38 Inconel 718 125 KSI, 40 Ph13-8Mo 125 KSIHead configuration code 2, e.g. EL 2 20 5 N N 8-6 (p.4-5 part number examples).

Sizes and grip: Nominal shank diameter in 1/32"; max grip in 1/16"; X = 1/64" oversize, Y = 1/32" oversize (p.4-5).

Source: Howmet Eddie-Bolt 2 process manual, p.7 Part Number Code Designations, Head Configurations ↗

Head configuration codes from the process manual; the pin prefix is EL ("ELS" in the new Spline-Lok numbering). Codes are shown as EL + head code.

Head styles (manufacturer terms)

Protruding Shear Head (EL2)
Protruding Tension Head (EL4)
100º Flush Shear Head (EL92)
100º Reduced Flush Shear Head (EL1)
100º Flush Tension Head (EL3)
100º Flush Tension Head, .007 Oversize Head (EL31)
100º Flush Tension Head, .014 Oversize Head (EL32)
100º Flush Tension Head, 6-Lobe Recess (EL33)
130º Flush Shear Head (EL90)
120º Flush Shear Head (EL91)
Flush MS20426 Head (EL5)
100º Reduced Crown Shear Head (EL6)
100º Crown Tension Head (EL7)
Crown MS20426 Head (EL8)
130º Crown Shear Head (EL93)
Self-Sealing Head (EL9)

Expanded elevational view of the collar and shear pin, with the collar shown partly in half section and the pin shown in a pair of sheets.US 4,260,005, Self-locking fastener, fastener system, and process (Stencel, VSI Corp.), Fig. 1 ↗ · US patent drawingWhy this family: VSI's US 5,061,132: "U.S. Pat. No. 4,260,005, an eponymous fastener often referred to as an Eddie bolt" (Edgar L. Stencel, VSI Corp., 1981). This is the original Eddie-Bolt; the same patent notes commercial Eddie bolts now use five flutes and three lobes, so Eddie-Bolt 2 differs in detail.

The collar and shear pin clamping a pair of sheets, but before the design clamp-up load has been reached. — Expanded elevational view of the collar and shear pin, with the collar shown partly in half section and the pin shown in a pair of sheets.US 4,260,005, Self-locking fastener, fastener system, and process (Stencel, VSI Corp.), Fig. 1 ↗ · US patent drawingWhy this family: VSI's US 5,061,132: "U.S. Pat. No. 4,260,005, an eponymous fastener often referred to as an Eddie bolt" (Edgar L. Stencel, VSI Corp., 1981). This is the original Eddie-Bolt; the same patent notes commercial Eddie bolts now use five flutes and three lobes, so Eddie-Bolt 2 differs in detail.

Compare every family's mechanism

Installation verification and preload

Installed preload

Not published numerically. The process manual describes it qualitatively: torque is applied until "the required clamp load" is reached, at which point the nut lobes deform into the pin flutes to form the lock.

What to check after install

Pin protrusion checked with gage EB2G1309: pin must sit between the MIN and MAX cutouts, checked after nut installation with no gaps between structure components.
Nut swage conformity: a Paddle (EB2G1000) or Thimble (EB2G1100/1200) gage must pass completely over the deformed lobes.
Head seating: a .002" feeler gage must not enter to the shank.
No rework: incomplete swage or a spinning pin means remove and replace both pin and nut; re-swaging is not permitted. Shaving flush heads is not permissible.

Check gauges (3) and sources.Details

EB2G1309 pin protrusion gage.
EB2G1000 Paddle / EB2G1100 and EB2G1200 Thimble swage gages.
EB2G1400 grip gage (pre-install); EB2G2000/2100 driver-wear gages.

Sources: Eddie-Bolt 2 process manual (Howmet). Acceptance limits belong to the controlling spec; verify against your program's process documentation.

Print a shop verification card for the floor

Tool: Delta-Rad driver (process manual)
Special / proprietary: Special tooling · proprietary
Training: Not stated in the cited documents.
Inspection: Pin protrusion gage EB2G1309; paddle/thimble swage gages (see verification below).

"The Delta-Rad driver, with its internal three-sided shape, fits over the three external lobes of the Eddie-Nut. Torque is applied and, upon reaching the required clamp load, the lobes automatically deform into and across the flutes of the Eddie-Pin to form a positive mechanical lock and complete the Foreign Object Debris (FOD)-free installation" (process manual p.2).

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
-5	ETL1108 / ETL1109 / ETL1110 / ETL1111 + Delta-Rad driver	None published	EB2G1400, EB2G1309, EB2G1000 / EB2G1100 / EB2G1200, EB2G2000-( ) / EB2G2100-( )
-6	ETL1108 / ETL1109 / ETL1110 / ETL1111 + Delta-Rad driver	None published	EB2G1400, EB2G1309, EB2G1000 / EB2G1100 / EB2G1200, EB2G2000-( ) / EB2G2100-( )
-8	ETL1108 / ETL1109 / ETL1110 / ETL1111 + Delta-Rad driver	None published	EB2G1400, EB2G1309, EB2G1000 / EB2G1100 / EB2G1200, EB2G2000-( ) / EB2G2100-( )
-10	Not in the published table for this size	None published	EB2G1400, EB2G1309, EB2G1000 / EB2G1100 / EB2G1200, EB2G2000-( ) / EB2G2100-( )
-12	Not in the published table for this size	None published	EB2G1400, EB2G1309, EB2G1000 / EB2G1100 / EB2G1200, EB2G2000-( ) / EB2G2100-( )

Full tool tables, envelopes, clearances and source notes Compare tooling burden across all 25 families

Howmet Eddie-Bolt 2 process manual, Removal Procedures

“The Eddie-Nut may be removed by using a hand or power removal tool designed for use in open or difficult access conditions. For Eddie-Nut removal from clearance fit holes, a hex or Spline-Lok key is necessary to prevent the Eddie-Pin from rotating. Tools shown: EBRT100, EBRT100-( )CF, EBRTO100-( ).” Howmet Eddie-Bolt 2 process manual, p.23, Removal Procedures ↗
“A power removal tool with a collet-type action provides trouble-free, high speed removal of Eddie-Nuts. Tool shown: ETR1000-(*).” Howmet Eddie-Bolt 2 process manual, p.24, Removal Procedures ↗

Cautions

“Removed Eddie-Nuts shall not be reused and Eddie-Pins must be replaced before installing a new Eddie-Nut.” Howmet Eddie-Bolt 2 process manual, p.24, Removal Procedures ↗
“Conventional hex or similar nuts cannot be used on Eddie-Pins.” Howmet Eddie-Bolt 2 process manual, p.24, Removal Procedures ↗
“NOTE: If sealant is used on installation, once the sealant sets, removal of the Eddie-Nut cannot be accomplished with a power tool.” Howmet Eddie-Bolt 2 process manual, p.24, Removal Procedures ↗

None of the removal procedures on file gives a composite-specific removal caution. The Monogram specs address composite at the hole instead: holes "reasonably round and free from burrs (metallic structure) and delamination (graphite/epoxy type structure)" (MBF2003 §5.1).

P/N series EL… pin / EN… nut · e.g. EL1205NN8-6YPaste a full part number into the decoder.

Manufacturer: Howmet/Huck
Category: Pin and collar

Datasheet (PDF) ↗
Manufacturer page ↗
Howmet Eddie-Bolt 2 process manual ↗: p.2 anatomy & lock; p.6-7 part-number codes (heads incl. 100°/120°/130°, materials & shear levels); p.12 hole diameters -5 to -12.

Find the part number for your stack

DiameterStack thickness, in

SpecLok has no dash-number table for this family yet: the quote line goes out as the family, part number to be confirmed.

QtyInclude install tooling

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.