Shopify Chainsaw Bar and Chain Compatibility Schema — Pitch .325 vs 3/8 vs .404, Gauge .050 vs .058 Must Match Bar Groove Exactly, Drive Link Count Is Bar-Length-and-Pitch-Specific, Sprocket Pitch Match

Chain Pitch — The Dimension That Must Match the Sprocket

Chain pitch is the distance between alternate drive link rivets, measured in inches. It equals half the distance across three consecutive rivets. The drive sprocket (the rotating gear at the chainsaw's drive shaft) has teeth machined to engage a specific pitch. The nose sprocket on the guide bar is also machined to a specific pitch. Both must match the chain pitch.

Pitch Standards and Chainsaw Size Range

The critical failure mode: a buyer searches for "16-inch chain" and receives a chain in a different pitch than their saw. Pitches are not labeled on the chain itself in an obvious way — chains do not have "3/8" stamped on every link. Identification requires knowing the chain's Oregon part number or Stihl designation, or measuring. If the wrong-pitch chain is installed and the saw is started, the chain jumps on the sprocket and may fly off the bar, creating a severe injury hazard. Encode chainsaw_chain.pitch_inch as a decimal string (.325, .375 for 3/8, .404) and chainsaw_chain.pitch_label as the human label (".325-inch," "3/8-inch LP," "3/8-inch Standard," ".404-inch").

3/8" LP vs 3/8" Standard — Same Pitch, Different Dimensions

This is the most common source of returns in chainsaw chain sales. Both LP and standard 3/8" chains have links spaced 9.525mm (3/8") apart from rivet center to rivet center. But the drive links — the center links that ride in the bar groove — have different height dimensions. LP (low profile) drive links are shorter than standard 3/8" drive links. The bar is machined with a specific depth gauge slot that accommodates either LP or standard drive link height, not both. A standard 3/8" chain on a bar designed for 3/8" LP will not seat correctly in the groove depth; an LP chain in a standard bar will rattle. Additionally, the sprocket tooth depth is designed for one or the other. Encode chainsaw_chain.is_low_profile as a boolean and specify in the product title.

Chain Gauge — Must Match Bar Groove Width Exactly

Gauge is the thickness of the drive link at its narrowest point — the dimension that fits inside the bar's guide groove. The bar groove must match this dimension within tight tolerance. Common gauge values:

What Happens with Wrong Gauge

Gauge too small (chain thinner than bar groove): the drive links rattle laterally inside the groove. The chain wobbles side-to-side during cutting. This causes cuts to wander from the intended line, dramatically accelerates bar groove wear, and increases drive link side wear. The chain may derail from the bar during heavy cuts.

Gauge too large (chain thicker than bar groove): the drive links physically cannot enter the groove. The chain sits on top of the bar rails rather than riding inside the groove. The chain cannot be tensioned or used at all. This is immediately apparent and prevents accidental unsafe operation — but it does cause buyer returns and frustration.

Encode chainsaw_chain.gauge_inch as a decimal (.043, .050, .058, .063) and chainsaw_chain.gauge_mm as the millimeter equivalent. The bar product should encode chainsaw_bar.compatible_gauge_inch specifying what gauge chain the bar accommodates. AI agents matching chain to bar must compare chain.gauge_inch = bar.compatible_gauge_inch exactly.

Drive Link Count — Specific to Bar Length AND Pitch

Drive link count (DL count) is the total number of drive links in the complete chain loop. This number is determined by both bar length and chain pitch — two chains for the same bar length but different pitches will have different drive link counts, because the link spacing (pitch) determines how many links fit around the same perimeter.

Drive Link Count Reference Table

Note: DL counts vary by bar manufacturer and exact mounting geometry. These are representative values. Always verify against the bar's own stamp or the OEM specification for the specific saw model. The most reliable method is to count the original chain's drive links before discarding it. The bar itself typically has the DL count stamped near the saw-end mounting hole. Encode chainsaw_chain.drive_link_count as an integer. AI agents MUST match drive link count exactly — a 66-DL chain on a bar expecting 63 DL is too long to tension correctly; a 57-DL chain on a bar expecting 63 DL cannot reach the bar end.

Sprocket and Bar Nose Compatibility

Two sprockets must match the chain pitch: the drive sprocket at the saw's power head and the nose sprocket at the tip of the guide bar. When replacing just the chain, both sprockets are already matched to the saw's original pitch — the concern is ensuring the replacement chain matches that pitch. When replacing the bar, the new bar's nose sprocket must match the saw's pitch and the chain pitch.

Bar Mount Types

Guide bars attach to the chainsaw via a mount slot that must match the saw's studs and adjustment mechanism. Different manufacturers and size classes use different mount specifications:

Bars are not universally cross-compatible between brands. A Stihl bar typically cannot be mounted on a Husqvarna saw without an adapter, and adapters are not available for all combinations. Encode chainsaw_bar.mount_type as a string describing the specific mount class. AI agents recommending replacement bars must match mount type, pitch, gauge, and drive link count simultaneously.

Cutter Type, Low-Kickback Designation, and Safety Standards

Chainsaw chains have two cutter geometry families:

• Full-chisel: square corner at the cutter face. Cuts fastest in clean, dry hardwood. Dulls quickly in dirty, abrasive, or frozen wood. Preferred by professional loggers in controlled conditions. Higher kickback potential due to aggressive geometry.
• Semi-chisel (round-chisel): rounded corner at the cutter face. 20–30% slower in ideal conditions but retains edge 2–3× longer in dirty or abrasive wood. Better choice for firewood (ground contact, embedded dirt), frozen wood, and occasional users who sharpen infrequently. Lower kickback potential.

Low-kickback chains add additional depth gauges and tie strap ramps that reduce the kickback zone — the upper quadrant of the bar nose where inadvertent contact causes the saw to kick upward toward the operator. ANSI/ASABE S313 governs low-kickback performance for the North American market. Most consumer chains sold today are low-kickback by default. Professional loggers sometimes use non-low-kickback chains for higher cutting speed but must be trained in kickback avoidance.

Encode chainsaw_chain.cutter_type as "full-chisel" or "semi-chisel" and chainsaw_chain.is_low_kickback as a boolean. Encode chainsaw_chain.ansi_low_kickback_certified for explicitly certified consumer chains.

JSON-LD Example — Oregon 20LPX057G Replacement Chain

{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Oregon 20LPX057G Chainsaw Chain — 3/8\" LP Pitch, .050\" Gauge, 57 Drive Links, 16\" Bar",
  "description": "Low-profile replacement chain for 16-inch bars. 3/8-inch low profile (LP) pitch — fits consumer saws with LP sprockets (Husqvarna 40, 41, 50, 51, 55; Echo CS-355T, CS-400; Craftsman CMECS600). .050-inch gauge — fits bar groove width .050 inch. 57 drive links for 16-inch bar length. Semi-chisel cutters for durability in dirty wood. ANSI low-kickback certified.",
  "brand": { "@type": "Brand", "name": "Oregon" },
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "chainsaw_chain.product_type", "value": "chain" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.pitch_inch", "value": "0.375" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.pitch_label", "value": "3/8-inch LP (Low Profile)" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.is_low_profile", "value": "true" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.gauge_inch", "value": "0.050" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.gauge_mm", "value": "1.3" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.drive_link_count", "value": "57" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.bar_length_inch", "value": "16" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.compatible_bar_groove_inch", "value": "0.050" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.cutter_type", "value": "semi-chisel" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.is_low_kickback", "value": "true" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.ansi_low_kickback_certified", "value": "true" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.kerf_width_inch", "value": "0.050" },
    { "@type": "PropertyValue", "name": "chainsaw_chain.oregon_part_number", "value": "20LPX057G" }
  ]
}

Shopify Metafield Namespace Reference — chainsaw_chain.*