Start with what you’re fastening and the hole size you have. Most assortment kits on this page include common sizes like 1/4-20, 5/16-18, 3/8-16 (SAE) and M4–M8 (metric) with matching nuts and washers.

1. Match diameter: Measure the bolt or hole (e.g., 1/4 in or M6).
2. Check thread: Kits list coarse counts like 20 TPI or a metric pitch (e.g., 1.0).
3. Pick length: Choose enough thread to pass through materials and washers.
4. Head style & washers: Hex, socket, or pan heads fit different tools; flat and lock washers help distribute load and resist loosening.

When replacing hardware, bring the old fastener for a quick match. Product details and reviews can help confirm compatibility.

Material matters. Many kits here are clearly labeled by material and coating, which can affect corrosion resistance.

• Stainless steel (e.g., 304): Generally offers strong corrosion resistance for damp or outdoor settings.
• Zinc-plated steel: Suitable for dry, indoor projects; coatings add some protection but may wear over time.
• Yellow zinc/other platings: Provide moderate protection and a distinct finish.
• Plastic/acrylic fasteners: Non-corroding and non-conductive, but typically for light-duty uses.

For areas exposed to moisture or salt, stainless assortments are commonly preferred. Actual performance can vary based on exposure and maintenance, so reviewing each item’s description and customer feedback before choosing is a good step.

You’ll usually see it in the labeling and thread specification:

• Metric: Labeled with an “M” (e.g., M4, M6) and a pitch in millimeters (M6 x 1.0). Tool sizes are metric.
• SAE (inch): Shown as fractions with thread-per-inch counts (e.g., 1/4-20, 5/16-18). Tool sizes are inch-based.

Metric and SAE don’t interchange; mixing can strip threads. If you’re replacing a fastener, match its markings or measure with a thread gauge if available. On Walmart product pages, look for “M” sizes versus inch sizes with TPI in the specs to quickly confirm which system the assortment uses.

A little setup can make these kits much easier to use and restock.

• Label compartments: Keep the size cards/tags in each bin or add your own.
• Sort after every project: Return extras, and pair bolts, nuts, and washers together for next time.
• Protect from moisture: Store in a dry spot; adding a small desiccant pack can help.
• Start threads by hand: This can reduce cross-threading before tightening with tools.
• Use the right tools: Hex keys for socket heads, screwdrivers for pan heads, and wrenches for hex bolts.

These habits can help keep your assortment complete and make future repairs faster. Always keep small parts away from children.

If a size runs low, you can browse the Fasteners category for individual packs or bulk boxes that match your assortment.

• Search by size: Use terms like “1/4-20 hex bolts” or “M6 nuts” to narrow results.
• Match specs: Confirm diameter, thread (TPI or pitch), length, and head style in the product details.
• Filter by material: Stainless, zinc-plated, nylon, and more are available, depending on stock.
• Consider a companion kit: A small machine screw or washer assortment can top off frequently used items.

Availability can vary by location and time. Delivery and pickup options shown at checkout can help you restock in a way that fits your schedule.