Hand Tools: Selection, Use and Care
Core ideas
Hand-tool questions test three things: whether the tool suits the fastener and material, whether you use it correctly, and whether you can recognise a damaged tool that must be withdrawn.
Tools and their rules
- Spanners and sockets: use the size that fits fully; a loose spanner rounds hex heads. Six-point sockets grip better than twelve-point on corroded fasteners. Use a ring spanner or socket on tight fasteners; open-ended spanners are for access, not high torque.
- Torque and leverage: extending a breaker bar with a pipe increases torque and risks shearing the fastener or cracking the socket. Never use a torque wrench to loosen fasteners.
- Screwdrivers: match tip type and size (Phillips, Pozidriv, flat, JIS on many Japanese machines). A worn, rounded tip cams out and damages the head. Do not use a screwdriver as a chisel or pry bar.
- Hammers and punches: use the correct weight; eye protection is mandatory because heads can chip. Discard hammers with loose or cracked handles ("hammer rash" around the eye is a rejection criterion).
- Pliers, cutters and circlip pliers: circlip pliers must match internal or external type and hole size; using side cutters on hardened wire damages the edges.
- Files and hacksaws: files cut on the forward stroke and need a handle; a hacksaw blade should have at least three teeth in contact with the work.
- Special tools: bearing pullers, seal drivers, clutch holders, fork cap tools and impact drivers protect components - questions often reward using the correct special tool over improvisation.
Traps
Questions present a plausible but damaging shortcut (extension pipe, screwdriver as a punch, undersized spanner) and ask what is wrong or what happens. Another trap is tool condition: mushroomed chisel heads, glazed files, cracked sockets.
Rule of thumb
Right tool, right size, pull toward you where possible, and inspect before use. If a fastener will not move with hand force on the correct tool, escalate to penetrating oil, heat or impact - not to more leverage.