Technical Subtest

ASVAB Shop Information (SI)

SI covers woodworking, metalworking, and general shop practices. CAT-ASVAB administers it separately; the P&P-ASVAB combines it with Auto.

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Score use
Used for job qualification
Focus areas
6
Examples in this guide
5
Section overview

What SI measures

Knowledge of tool identification and use, shop terminology, measuring and layout, cutting and shaping, fasteners, building materials, metalworking, and safe workshop practices.

What appears on the test

  • Measuring & LayoutTape measures, levels, squares, calipers, marking tools
  • Cutting & ShapingSaws, chisels, files, planes, drill bits, abrasives
  • Fasteners & ThreadsNails, screws, bolts, rivets, taps, dies
  • Wood & Construction MaterialsLumber, plywood, grain direction, adhesives
  • MetalworkingPunching, drilling, filing, grinding, joining
  • Power Tools & SafetyTool selection, clamping, guards, PPE, safe procedures
Concept visual

Identify a wrench by its working end

Open-end wrench with U-shaped jawsOpen-endSide access
Box-end wrench with enclosed endsBox-endGrips more flats
Adjustable wrench with a movable jawAdjustableFits several sizes
Socket wrench ratchet with a square driveSocketSwappable sockets
Torque wrench with an adjustable scale handleTorqueSets exact torque
Pipe wrench with toothed jaws gripping round pipePipeBites round pipe
Match the head, grip, and adjustment mechanism to the fastener and the required torque.

What to study for SI

For SI, organize tools by purpose instead of memorizing one long list. For each tool, know the material it works on, the operation it performs, and the similar tool it is most likely to be confused with.

01

Measuring, marking, and layout

Accurate work starts with choosing the tool that measures or marks the required feature.

View key facts
  • A level checks horizontal level and vertical plumb; a square checks or lays out angles.
  • Calipers compare inside, outside, or depth dimensions more precisely than a ruler.
  • A center punch makes a starting dimple so a drill bit is less likely to wander on metal.
02

Saws and cutting tools

Match blade shape and tooth pattern to the material and direction of cut.

View key facts
  • A rip saw cuts with wood grain; a crosscut saw cuts across it.
  • A hacksaw uses a fine-tooth replaceable blade for metal and other hard materials.
  • A coping saw handles curved cuts; a cold chisel cuts or shapes metal.
03

Threads, fasteners, and holes

Know how threaded and nonthreaded fasteners hold materials and which tools prepare their holes.

View key facts
  • A tap cuts internal threads in a hole; a die cuts external threads on a rod.
  • A pilot hole helps guide a screw and reduces the chance that wood will split.
  • A countersink forms a conical recess so a flat-head screw can sit flush with the surface.
04

Wood and sheet materials

Study how grain, moisture, and layered construction affect cutting, fastening, and strength.

View key facts
  • Plywood is made from glued veneers with adjacent grain directions usually crossed for stability.
  • Hardwoods generally come from broadleaf trees; softwoods generally come from conifers.
  • A plane removes thin shavings to flatten or smooth wood; sandpaper uses abrasive grit to finish it.
05

Metalworking tools

Separate tools that strike, hold, cut, smooth, and finish metal.

View key facts
  • A ball-peen hammer is used for metalworking tasks such as peening and shaping rivets.
  • A bench vise holds work securely; soft jaw covers can protect finished surfaces.
  • Most hand files cut on the forward stroke and should be fitted with a handle before use.
06

Power tools and shop safety

Tool knowledge includes safe setup: stable work, correct guards, and the right protective equipment.

View key facts
  • Clamp small work instead of holding it near a moving blade or drill bit.
  • Disconnect power before changing a blade, bit, or abrasive wheel.
  • Use eye protection for flying chips and face protection appropriate to grinding or cutting hazards.

5 ASVAB-style practice questions

Open a question to review the choices, correct answer, and a short explanation.

Q1Why are adjacent plies in plywood usually arranged with their grain running in different directions?View question and answer
  1. To improve stability and strength in more than one direction
  2. To make the panel easier to split
  3. To eliminate the need for adhesive
  4. To make every layer the same thickness
Correct answerA. To improve stability and strength in more than one direction

Why: Crossing the grain directions reduces directional weakness and helps limit warping and dimensional change.

Q2Which hammer is most appropriate for peening the end of a metal rivet?View question and answer
  1. Rubber mallet
  2. Ball-peen hammer
  3. Claw hammer
  4. Sledgehammer
Correct answerB. Ball-peen hammer

Why: The rounded peen of a ball-peen hammer is intended for forming and shaping metal, including rivet ends.

Q3A rip saw is designed primarily to cut wood:View question and answer
  1. Across the grain
  2. Only on a curve
  3. With the grain
  4. Only after drilling a pilot hole
Correct answerC. With the grain

Why: Rip-saw teeth act like small chisels to separate fibers along the wood grain. A crosscut saw cuts across the grain.

Q4What is the safest way to drill a small loose piece of metal on a drill press?View question and answer
  1. Grip it with locking pliers held by hand
  2. Brace it against the table without clamping
  3. Steady it with a gloved hand at low speed
  4. Clamp it securely before drilling
Correct answerD. Clamp it securely before drilling

Why: Clamping prevents the workpiece from spinning or being pulled from the operator's hand when the bit catches.

Q5What is the primary advantage of a box-end wrench over an open-end wrench on the same hex fastener?View question and answer
  1. It contacts more sides and is less likely to slip
  2. It fits every fastener size
  3. It can cut damaged threads
  4. It measures the bolt diameter
Correct answerA. It contacts more sides and is less likely to slip

Why: A box end surrounds the fastener head and contacts more flats, improving grip and reducing the chance of rounding the corners.

SI study strategy

  1. Build a tool-purpose-material table: for example, hacksaw / cutting / metal.
  2. Study confusing pairs together: tap vs die, rip vs crosscut, level vs square, file vs reamer.
  3. Look at the cutting edge or working surface in tool illustrations; it often reveals the intended operation.
  4. Treat safety questions literally: secure the work, keep guards installed, and disconnect power before adjustments.
  5. Work through the five guide questions untimed, then use the full practice bank for timed tool-identification sets.
Optional 7-day study planUse this only if you want a day-by-day way to organize the same core topics.Open the full plan
  1. Day 1

    Measuring and layout: Identify rules, tapes, levels, squares, calipers, gauges, scribes, and punches by purpose.

  2. Day 2

    Saws and cutting: Compare tooth patterns and match each saw, chisel, snip, and knife to its material and cut.

  3. Day 3

    Drilling and threads: Review drill-bit parts, pilot holes, countersinks, reamers, taps, and dies.

  4. Day 4

    Fasteners and joining: Study nails, screws, bolts, nuts, washers, rivets, adhesives, soldering, brazing, and welding basics.

  5. Day 5

    Wood and metal: Review wood grain, plywood, lumber terms, common metals, files, hammers, vises, and abrasives.

  6. Day 6

    Power tools and safety: Match common stationary and portable tools to their uses and rehearse safe setup steps.

  7. Day 7

    Timed review: Answer a mixed set from the practice bank at a steady pace and make comparison cards for every missed tool.

Ready to practice SI?

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