Name: Avdel Avdelok (industrial)
Brand: Avdel

Two-sided, lockbolt (swaged collar): “Avdelok®, Maxlok® and Avtainer® lockbolts require access from both sides of the component.” (Avdel Lockbolt Systems catalog, p.6, Fastener selection, Accessibility)

Shear: 37-69 ksi
Blind bulb: n/a
Install: Both sides needed
Diameters: 3/16, 1/4, 5/16, 3/8"
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 (commercial lockbolt)
·Ground support equipment, tooling, non-flight structure
·Two-side accessible joints

Strengths

+"High, controlled clamp"; "easy to inspect for tampering" (Avdel catalog)
+Steel, stainless steel and aluminium alloy (Avdel catalog)

Trade-offs

−Industrial product: not procured to an aerospace spec, no published MMPDS allowables
−Needs access to both sides
−Avdel placing tools

Also called Avdelok, structural lockbolt. P/N: 2621 brazier head / 2622 90° countersunk / 2624 truss head (steel) · 2691 stainless · 2801 aluminium

Datasheet strength: "Steel Avdelok pins typically offer comparable values to property class 5.8 threaded products"; 6.4 mm (1/4") min shear 14.73 kN: Avdel datasheet 2621.

Standards

Avdel commercial Avdelok series 2621 brazier / 2622 csk / 2624 truss (no NAS/MS spec)

Materials and galvanic compatibility vs CFRP

Alloy	Shear	vs CFRP	Notes	Source
Carbon steel	64 ksi	high	Carbon-boron steel pin (SAE 10B21), low-carbon steel collar, zinc (2621/2622/2624). Min shear 8.63 kN (4.8 mm) to 32.08 kN (9.6 mm)	Derived: Avdel datasheet min shear (kN) ÷ nominal area = 64-69 ksi; Avdel: comparable to property class 5.8
Stainless (CRES)	62 ksi	low	Stainless pin (2691). Min shear 7.79 kN (4.8 mm), 14.55 kN (6.4 mm)	Derived: Avdel 2691 datasheet min shear ÷ nominal area = 62-66 ksi
Aluminum	37 ksi	high	Aluminium alloy pin & collar (2801). Min shear 4.67 kN (4.8 mm) to 18.69 kN (9.6 mm)	Derived: Avdel 2801 datasheet min shear ÷ nominal area = 37 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: Avdel Lockbolt Systems catalog (EN, mm) ↗: Avdelok 2621/2622/2624 (steel), 2691 (stainless), 2801 (aluminium) datasheets: materials, grips, min shear & tensile in kN. Lead-time risk is SpecLok's sourcing assessment, not a datasheet value.

4 head styles

Not redrawn: no head dimensions for this variant in the documents on file. The data at right is from the cited document.

Brazier head

2621: Pin: carbon boron steel, zinc plated; collar: low carbon steel
2691: Pin and collar: stainless steelAvdel Lockbolt Systems catalog, Avdelok 2691 ↗
2801: Pin and collar: aluminium alloyAvdel Lockbolt Systems catalog, Avdelok 2801 ↗

Source: Avdel Lockbolt Systems catalog, Avdelok 2621 ↗

Avdelok LD (2861 / 2871 countersunk) is a separate large-diameter range and is not listed here.

Head styles (manufacturer terms)

Brazier head (2621, 2691, 2801)
90° Countersunk (2622, 2802)
Truss head (2624, 2803)
Large head (2804)

Pin and collar · 3 steps

1/3Pin and collar

“Avdel® structural lockbolts consist of a separate pin and collar which are mechanically locked during installation.”

Avdel Lockbolt Systems catalog, p.2 ↗

Drawing traced from: Panel 1.

Key (how to read these diagrams)

Manufacturer figure: Avdel Lockbolt Systems catalog, p.8, Typical placing sequence, panels 1-3 ↗The Avdel placing sequence has no step captions; the quotes are the same catalog's descriptions of the system (pp.2 and 4).Schematic cross-section at the source figure's proportions, not to scale. Terms are the document's own.

Compare every family's mechanism

Official manufacturer install demonstration: Avdel Avdelok (industrial) installation.

Installation verification and preload

Installed preload

Per-size clamp is not published in the catalog. Qualitative claims only: steel Avdelok pins "typically offer comparable values to property class 5.8"; Avdelok LD minimum shear/tensile/pre-load "equivalent to or exceeds property class 8.8 / ASTM A-325"; Avdelok XT headline "joint clamp (pre-load) of over 225 kN" for the large sizes.

What to check after install

Installed (swaged) collar dimensions are published per datasheet drawing: maximum installed collar length (S) and diameter (T) per size and collar style, e.g. 9.6 mm full collar: S max 18.6 mm, T max 15.5 mm.
Pintail break and full swage; shear/tensile minima published per size (kN).

Check gauges (1) and sources.Details

No named gauges in the catalog checked; NAS1446-1452 swage-pin standards reference collar inspection gages (NAS1563) for the NAS-standard equivalents.

Sources: Avdel Lockbolt Systems catalog. Acceptance limits belong to the controlling spec; verify against your program's process documentation.

Print a shop verification card for the floor

Tool: Avdel placing tools, e.g. hydro-pneumatic 722 (all sizes 4.8-9.6 mm) and 734 (Avdel catalog)
Special / proprietary: Special tooling · proprietary
Training: Not stated in the cited documents.
Inspection: Installed collar dimensions per datasheet (see verification below).

Two-piece pin and collar lockbolt; the placing tool swages the collar and the pintail breaks off (Avdel catalog).

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.

Tool: Avdel placing tools, e.g. hydro-pneumatic 722 (all sizes 4.8-9.6 mm) and 734 (Avdel catalog)

The Avdel catalog names the 722 and 734 hydro-pneumatic placing tools; per-size nose assemblies were not extracted. Confirm with Stanley Engineered Fastening.

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

Removal

No published removal procedure found; follow the manufacturer's instructions. Manufacturer page ↗

P/N series 2621 brazier head / 2622 90° countersunk / 2624 truss head (steel) · 2691 stainless · 2801 aluminiumPaste a full part number into the decoder.

Manufacturer: Avdel
Category: Lockbolt (swaged collar)

Datasheet (PDF) ↗
Manufacturer page ↗
Avdel Lockbolt Systems catalog (EN, mm) ↗: Avdelok 2621/2622/2624 (steel), 2691 (stainless), 2801 (aluminium) datasheets: materials, grips, min shear & tensile in kN.

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): 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.