Nail head diameter (pallet nails)
Also called: head diameter, head size
Nail head diameter is the width of a nail's head. It sets how well the nail resists pulling through the deckboard; the Uniform Standard requires the head to be at least 2.25 times the wire diameter for reusable pallets.
In depth: Pallet nails and fasteners: types, sizes, MIBANT and nail counts
When a loaded deckboard is pulled away from a stringer, the nail either withdraws from the stringer or its head pulls through the deckboard. A larger head spreads the force over more wood, which matters most on thin deckboards.
Typical values and minimums
| Item | Value |
|---|---|
| Common pallet nail head | 0.280 to 0.281 in (7.1 mm) |
| Metric examples | 5.0, 7.0, 7.5 mm |
| Minimum head-to-shank ratio, reusable (Uniform Standard, 2012) | 2.25 |
| Minimum head-to-shank ratio, single-use or repair | 2.00 |
For an 11.5 ga nail with 0.112 in wire, the reusable minimum head is 0.112 × 2.25 = 0.252 in (6.4 mm). A 0.280 in head gives a ratio of 2.5.
Why it matters
Head pull-through becomes the weak point when deckboards are thin or low-density, or when a pallet is wet. The Uniform Standard (2012) Annex F head pull-through equation grows with deckboard thickness, wood density and the difference between the squares of head and shank diameter, and falls as moisture content rises. Clipped-head or undersized heads, used to fit more nails in a collated strip, reduce this margin.
On a spec sheet
"Head Dia" in the fastener table, for example 0.280 in.
Related
- GlossaryNail (pallet fastener)A nail is the standard fastener for wood pallets, driven through deckboards into stringers or blocks. Pallet nails are specified by shank type (helical, annular or plain), length, wire diameter, head diameter and bending strength.
- GlossaryWire diameter (pallet nails)Wire diameter is the diameter of the steel wire a nail or staple is made from, measured on the shank before threads are rolled. Pallet nails are commonly 0.099 to 0.120 in (2.5 to 3.0 mm), or 12.5 to 11 gauge.
- GlossaryWhat is a pallet deckboard?A deckboard is a board in the top or bottom deck of a pallet that runs perpendicular to the stringers or stringerboards. It is specified by actual thickness × width × length, for example 5/8 × 3-1/2 × 40 in.
- GuidesPallet nails and fasteners: types, sizes, MIBANT and nail countsMost wood pallets use threaded nails: helical (screw shank) for dense hardwoods, annular (ring shank) for softwoods. A typical deck nail is 2-1/4 in long with 0.112–0.120 in (11.5–11 gauge) wire. The Uniform Standard requires at least 2 nails per joint on boards up to 5-1/4 in wide and 3 on wider ones.
- StandardsUniform Standard for Wood Pallets (Woodpack Global, formerly NWPCA)The Uniform Standard for Wood Pallets is the North American industry standard for specifying, building and repairing wood pallets: terms, lumber quality, tolerances, fasteners, notches, repair and performance. Woodpack Global (formerly NWPCA) publishes it; it is voluntary and was revised in 2025.
More in Fasteners
- GlossaryAnnularly threaded nail (pallet)An annularly threaded nail, or ring shank nail, has a series of rings rolled into its shank that lock into the wood fibers. It is generally recommended for low-density hardwoods and most softwoods.
- GlossaryClinched nail (pallet)A clinched nail is driven all the way through the parts it joins and has its protruding tip bent over flat. Block-pallet deck mats (deckboards plus stringerboards) are commonly assembled with clinched nails.
- GlossaryHelically threaded nail (pallet)A helically threaded nail has spiral flutes rolled into its shank so it rotates as it is driven, which locks it into the wood. It is the most common pallet nail, recommended for medium- and high-density hardwoods.
- GlossaryMIBANT (nail bend test)MIBANT (Morgan Impact Bend Angle Nail Tester) is an impact-bend test for nail stiffness, run under ASTM F680. A weight strikes a clamped nail and the resulting bend angle is recorded; a lower angle means a stiffer, better nail.
- GlossaryNailing pattern (pallet)A nailing pattern is the number and position of fasteners at each joint of a pallet. The Uniform Standard sets minimums by deckboard width: 2 fasteners per joint for boards up to 5-1/4 in wide and 3 for 5-1/4 to 7 in.
- GlossaryPlain shank nail (pallet)A plain shank nail has a smooth shank with no threads. It has the lowest withdrawal resistance of pallet nails, so on pallets it is mainly used where it is clinched, such as block-pallet deck mats.
Last reviewed 2026-09-24. 209 words.