ASVAB · Shop Information · 7 min read
Fasteners and Adhesives
- Identify common types of nails, screws, and bolts by their sizing systems, head styles, drive types, and thread profiles.
- Differentiate the operational functions of specialized nuts, washers, machine pins, and rivets used in mechanical assemblies.
- Classify workshop adhesives and chemical threadlockers by their curing mechanisms, bonding properties, and intended materials.
Nails, Screws, and Drive Systems
In workshop construction and assembly, mechanical fasteners join materials together through friction, clamping pressure, or physical interlocking. Nail size is traditionally measured using the penny system, which is designated by the letter d. Under this historical sizing standard, a larger penny number generally indicates a longer nail, while the overall thickness also depends on the specific type of nail selected for the job. Common nails have relatively thick shanks and broad, flat heads and are used for framing and other general wood construction. In contrast, box nails have a thinner shank than common nails, an intentional design feature that significantly reduces the risk of splitting light wood during installation.
Finishing and specialty work requires different nail profiles tailored to appearance, holding power, or demanding base materials. Finishing nails have small cupped heads that can be countersunk beneath the wood surface with a nail set, allowing the resulting depression to be filled for a smooth, unblemished presentation. Brad nails are small, thin wire nails used for delicate trim and moldings because they are less likely than thicker nails to split the wood. Ring-shank nails feature circumferential ridges formed along the shank that significantly increase withdrawal resistance in wood. For exterior surfaces, roofing nails have large, flat heads that help hold shingles and roofing felt in place and resist pulling through them in heavy weather. Ordinary nails are generally unsuitable for masonry; hardened masonry nails can be driven into some masonry, but hard concrete or brittle brick may require a drilled hole and an appropriate anchor.
Threaded fasteners like screws provide exceptional holding force and can often be removed without damaging the workpiece. Wood screws have pointed tips and threads that grip wood fibers; when properly installed, they can draw two pieces of wood tightly together to form a rigid joint. Sheet metal screws feature sharp threads along their entire shank that tap matching threads into thin metal as they are driven. For interior panel installation, drywall screws typically have bugle heads designed to sit just below the drywall surface without tearing its paper facing when driven correctly.
Head profiles and drive patterns determine how a screw engages both the workpiece and the driver. Flat head screws are designed to sit flush with or below the surface of a countersunk hole, providing a smooth finish. Conversely, round head and pan head screws have heads that rest entirely above the surface of the workpiece. Driving these fasteners requires matching the driver to the recess: common screw drive types include slotted, Phillips, Robertson square, and Torx star drives. Matching the proper driver prevents slipping and protects the fastener head.
| Nail Type | Distinguishing Physical Features | Primary Application |
|---|---|---|
| Common Nail | Thick shank and broad flat head | Structural wood framing |
| Box Nail | Thinner shank than a common nail | Light wood construction to reduce splitting |
| Finishing Nail | Small cupped head driven below surface with a nail set | Trim carpentry where fastener must be concealed |
| Brad Nail | Small, thin wire nail | Attaching delicate trim and moldings |
| Roofing Nail | Large, flat head | Securing shingles and roofing felt against pull-through |
| Masonry Nail | Hardened steel construction | Driving into concrete, brick, or mortar |
| Ring-Shank Nail | Circumferential ridges along the shank | High withdrawal resistance in wood assemblies |
Common mistakes
- Assuming split-ring lock washers completely prevent bolted joints from loosening under severe vibration, whereas they are intended to resist loosening but may not prevent it.
- Using a thick common nail where a thinner fastener is appropriate: box nails reduce splitting in light construction, while brads or finishing nails are often better choices for delicate trim.
- Confusing how cyanoacrylate and anaerobic threadlockers cure: cyanoacrylate cures rapidly upon exposure to trace surface moisture, while anaerobic threadlockers cure between metal threads when oxygen is excluded.
- Mismatched thread pitch concepts: confusing the inch standard (threads per inch) with the metric standard (pitch as the millimeter distance between adjacent threads).
Key points
- Nail sizes use the penny system designated by the letter d; common nails handle structural framing, box nails have thinner shanks to prevent splitting light wood, and finishing nails can be countersunk with a nail set.
- Properly installed wood screws can draw wood pieces together; many sheet metal screws form threads in a prepared hole, and drywall screws have bugle heads that help avoid tearing the paper when driven to the correct depth.
- Bolts pass through clearance holes and mate with nuts, while machine screws fit tapped holes or nuts; coarse threads assemble faster and resist cross-threading, whereas fine threads offer finer adjustments.
- Locking nuts include jam nuts, nylon-insert lock nuts, and slotted castle nuts secured with cotter pins; wing nuts allow tool-free operation, and acorn nuts provide a protective domed cap.
- Specialty pins like dowel pins align precision parts, slotted roll pins compress to hold by spring force, and clevis pins accept cotter pins or hairpin clips for retention.
- Solid rivets require access to both sides, while blind rivets (pop rivets) use an internal mandrel pulled by a tool until it snaps, allowing installation from a single accessible side.
- Adhesives bond through varied mechanisms: PVA and aliphatic resin glues bond porous wood, two-part epoxy cures when its resin and hardener react, one-part polyurethane glue cures with moisture and typically expands, prepared contact-cement surfaces bond on contact, and anaerobic threadlockers cure between assembled metal threads when oxygen is excluded.
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