What this kit is A 16-piece, zinc-finish steel mounting kit that secures one plate-mount caster to a 5/16"-18 bolt-pattern equipment frame. Includes 4 carriage bolts, 4 hex thread-cutting screws, 4 SAE flat washers, and 4 nylon-insert lock nuts. Engineered for industrial cart, dolly, tool-box, and material-handling applications where a 5/16" bolt diameter matches the caster top plate. Kit Specifications Pieces per kit 16 (4 of each component) Mounts 1 plate-mount caster Thread spec 5/16"-18 UNC Bolt length 1" Material Low-carbon steel Finish Zinc plated Bolt grade ASTM A307 Grade A (carriage bolts) Nut type Grade 2 nylon-insert lock nut Washer type SAE general-purpose flat washer Application Indoor industrial; dry environments What's Included (16 pieces total) 4 × 5/16"-18 × 1" hex-slotted drive indented hex washer head Type F point thread-cutting screws, zinc finish, low-carbon steel — for self-tapping installation into thin-wall steel frames 4 × 5/16"-18 × 1" round-head carriage bolts, zinc finish, ASTM A307 Grade A — for through-bolting to wood, fabricated steel, or pre-drilled equipment 4 × 5/16" SAE general-purpose flat washers, zinc finish, low-carbon steel — for load distribution under the nut 4 × 5/16"-18 nylon-insert lock nuts, zinc finish, Grade 2 — vibration-resistant retention Which casters does this kit fit? Fits any plate-mount caster with a 5/16" bolt-hole diameter — typically: 1-1/4" wide casters with 2-3/8" × 3-5/8" or 3-1/8" × 4-1/8" top plates Light- to medium-duty casters rated up to ~500 lb capacity per caster Office, retail-fixture, food-service, healthcare, and light-industrial cart applications For 4" × 4-1/2" plates, 4-1/2" × 6-1/4" plates, or heavier-duty casters, use our 3/8"-16 or 1/2"-13 kits instead. Engineer Tip If you're mounting to thin-gauge steel (≤14 ga.), the thread-cutting screws self-tap and skip the need to drill clearance holes. For wood platforms or fabricated steel ≥1/8" thick, use the carriage bolts with a square hole punched or drilled to 5/16" — the square shoulder seats and prevents bolt rotation while you tighten the lock nut. Common Applications Service carts, utility carts, and rolling tool boxes (Knaack, Jobox, Greenlee, etc.) Office furniture, mailroom carts, and AV equipment racks Food-service prep tables and stainless utility carts (light-duty zinc — for stainless wet environments choose stainless hardware) Retail-fixture rolling displays and trade-show cases Healthcare carts and lab equipment carts Frequently Asked Questions How many casters does one kit mount?One kit (16 pieces) mounts a single plate-mount caster. For a 64-piece set (mounts 4 casters) alternative, see our 64-piece set (mounts 4 casters). Will these bolts fit a different caster top plate size?This kit is sized for 5/16" bolt-hole diameter, which matches caster plates listed above. For other plate sizes, choose the 5/16", 3/8", or 1/2" kit that matches your bolt-hole diameter. Are these stainless?No — these are zinc-plated low-carbon steel. For washdown, food-grade, marine, or chemical environments, request stainless 304 or 316 hardware via our quote desk. What's the difference between the carriage bolts and the thread-cutting screws?Carriage bolts pass through a pre-drilled or punched 5/16" hole and secure with a nut and washer on the back side — best for wood or steel where you have access to both sides. Thread-cutting screws self-tap into thin steel and only need access from the caster side. The kit ships both so you can choose the right method per installation. Are these grade 5 or grade 8?The carriage bolts are ASTM A307 Grade A (commercial grade, ~60 ksi tensile). For higher-load critical applications, request Grade 5 or Grade 8 via the quote desk. Need stainless, Grade 5/8, or a custom thread spec? Our procurement team sources upgraded hardware for OEM, MRO, and aerospace builds. Same-day quote. Request a Custom Quote {"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "How many casters does one 5/16\" caster mounting hardware kit mount?", "acceptedAnswer": {"@type": "Answer", "text": "One 16-piece 5/16\"-18 caster mounting hardware kit mounts one plate-mount caster."}}, {"@type": "Question", "name": "Will 5/16\" caster bolts fit different plate sizes?", "acceptedAnswer": {"@type": "Answer", "text": "This 5/16\" kit fits caster top plates designed for 5/16\" bolt-hole diameters. For other plates, use the 5/16, 3/8, or 1/2 kit that matches your bolt-hole spec."}}, {"@type": "Question", "name": "Is 5/16\" caster mounting hardware stainless?", "acceptedAnswer": {"@type": "Answer", "text": "Standard 5/16\" caster mounting hardware is zinc-plated low-carbon steel. Stainless 304 or 316 hardware is available via custom quote for washdown, food-grade, or marine environments."}}, {"@type": "Question", "name": "What is the difference between caster carriage bolts and thread-cutting screws?", "acceptedAnswer": {"@type": "Answer", "text": "Carriage bolts pass through a pre-drilled hole and secure with a nut and washer on the back side, ideal for wood or fabricated steel with two-sided access. Thread-cutting screws self-tap into thin-gauge steel and require access from only the caster side."}}]}
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