Craftsman 636796251 brushwacker gas line trimmer Parts

For a Craftsman 636796251 gas line trimmer, .095 trimmer line is usually the better choice because it holds up longer in thicker weeds and along fences. Use .080 line when you want easier feeding and lighter cutting for routine trimming.

Quick comparison

Trimmer line size	Best for	Trade-off
.080 inch	Light grass, touch-up edging, faster/easier line feed	Wears faster in heavy weeds
.095 inch	Thicker grass, weeds, fence lines, longer runtime per reload	Can be harder to feed; may overload a small trimmer head

How to choose the right size for your trimmer head

• Match the line size to what the trimmer head is designed to accept; forcing thicker line can cause poor feed or head wear.
• If your head feeds poorly with .095, step down to .080 and use a sharper line profile (twist or serrated) for better cut.
• If you break line constantly with .080, move up to .095 for durability.
• For dense weeds, use shorter line length and slower sweep speed to reduce bogging.
• Keep line dry and stored out of sun; brittle line snaps regardless of diameter.

What we recommend for common yard conditions

• Mostly lawn edging and light trimming: .080
• Mixed grass and weeds, occasional thick spots: start with .095; drop to .080 if feeding becomes inconsistent
• Frequent trimming around hard surfaces (curbs, chain link, rocks): .095

Why it matters

Line diameter affects cutting load, feed reliability, and how often you have to stop to reload. On a gas trimmer like the Craftsman 636796251, .095 often gives the best balance of durability and productivity, as long as your trimmer head is rated for it.

For help confirming you have the correct model number before ordering supplies, use how to find your appliance model number (and what it means for parts).

Last updated: February 2026

To look up the model number for your Craftsman line trimmer (model 636796251), find the model tag on the trimmer and use that exact number when searching parts. On most gas trimmers, the tag is on the shaft, engine housing, or near the handle.

Where to find the model number on a Craftsman gas line trimmer

Check these common locations first:

• On the shaft/tube near the throttle handle
• On the engine housing (recoil starter side or near the muffler)
• Near the fuel tank or rear handle area
• On a sticker or metal plate close to the cutting head/guard mount
• Sometimes under heavy dirt or grass buildup (wipe the area clean and recheck)

What to write down (so parts match)

Use the full model number exactly as shown on the tag.

Item to capture	Example	Why it matters
Model number	636796251	Identifies the correct parts breakdown
Serial number (if shown)	Varies	Helps confirm production run/version
Product name/type	Gas line trimmer	Helps avoid mixing with similar models

Why it matters

Craftsman trimmers often have multiple versions that look similar but use different parts (for example, starter components, fuel lines, carburetor parts, or cutting head hardware). Using the exact model number prevents ordering the wrong replacement.

If the tag is missing or unreadable

Use these practical checks to narrow it down:

• Look for a stamped number on the shaft or engine casing
• Compare the engine layout (air filter cover shape, primer bulb location, muffler position)
• Note the shaft style (straight vs. curved) and cutting head type
• Search by the closest model number you can read, then confirm by matching diagrams

For help identifying the correct number format and where to look on equipment tags, use how to find your appliance model number (and what it means for parts).

Last updated: February 2026

On a Craftsman Weedeater (including model 636796251), the model number is printed on the product ID label, usually on the engine/motor housing, the shaft, or near the handle. Use the full model number exactly as shown to match the correct parts list.

Common places to check

Look for a sticker or metal tag with numbers and letters. On most Craftsman gas line trimmers, it’s found in one of these spots:

• Side of the engine/motor casing (near the starter housing)
• Top of the engine cover, close to the spark plug area
• Along the shaft/tube, especially near the throttle/handle clamp
• Near the fuel tank or behind the air filter cover
• Underside of the guard/shield area (less common)

What to write down (so parts match)

When you find the label, record everything that identifies the unit:

• Full model number (all digits/letters)
• Any revision or type number (if shown)
• Serial number (helpful for production changes)
• Brand name (Craftsman) and product description (line trimmer)

Quick checklist if you can’t spot the label

• Wipe dirt and grass residue off the housing and shaft; labels are often obscured.
• Use a flashlight and check the back side of the engine and the underside of the shaft.
• If the label is damaged, look for an embossed/printed number on the engine shroud or shaft clamp area.

Why it matters

Craftsman trimmers can look similar across multiple model runs, but parts like the carburetor, fuel lines, primer bulb, ignition module, and trimmer head can vary by model number. Using the exact model number helps prevent ordering the wrong replacement part.

Helpful reference

If you need a quick visual on what the label looks like, use our guide: how to find your appliance model number (and what it means for parts).

Last updated: February 2026

Some line trimmer heads are interchangeable, but it depends on the attachment style used on your Craftsman 636796251 brushwacker gas line trimmer. Heads must match the shaft type (straight or curved), the drive method, and the arbor size or thread direction so the head seats and spins correctly.

What has to match for a head to fit

To swap heads successfully, we match the connection details first, not the brand name on the head.

• Shaft type: straight-shaft and curved-shaft heads are often different
• Attachment method: threaded head, bolt-on head, or quick-change system
• Thread size and direction: common options include left-hand threads on some models
• Arbor/bore size: the center hole must fit the output shaft or adapter
• Drive style: some heads need a specific drive washer or thrust plate
• Cutting system: bump-feed, fixed-line, or bladed head (if supported)

Quick compatibility checklist (before you buy)

Use this as a fast way to avoid ordering a head that will not mount or will loosen during use.

Check item	What to look for	Why it matters
Shaft style	Straight vs. curved	Affects head design and clearance
Threads	Size plus left-hand vs. right-hand	Wrong thread will not tighten safely
Mounting hardware	Washer, spacer, nut, retainer	Missing pieces cause wobble and vibration
Head type	Bump-feed vs. fixed-line	Determines how line advances and reloads

How we recommend confirming fit on model 636796251

Because this model page does not include a model-specific head part listing, the most reliable approach is to confirm what is currently installed and match those specs.

• Remove the trimmer head and note whether it unthreads (threaded) or comes off with a center bolt (bolt-on)
• Measure the shaft or bolt diameter with a caliper (or compare to known hardware sizes)
• Check for left-hand thread indicators (often loosens clockwise, tightens counterclockwise)
• Inspect the drive washer and thrust plate for wear; replace if rounded or grooved
• If the head wobbles now, inspect the output shaft and mounting surfaces before installing a new head

Why it matters

A “close enough” trimmer head can cross-thread, loosen, or vibrate excessively. Matching the correct thread direction, arbor size, and drive hardware protects the gearbox, reduces line breakage, and keeps cutting performance consistent.

For help confirming the correct replacement parts by model number, use how to find your appliance model number (and what it means for parts).

Last updated: February 2026

For your Craftsman model 636796251 gas line trimmer, buy trimmer line by matching the line diameter your trimmer head is designed to use first, then choosing a line shape that fits your yard (grass edging vs. heavier weeds). The correct diameter prevents feed problems and breakage.

Choose the right line diameter first

Most Craftsman gas trimmers in this class use one of these common diameters; start with the diameter your head accepts.

• 0.065 in: light trimming and small grass
• 0.080 in: general-purpose trimming
• 0.095 in: thicker grass, weeds, fence lines
• 0.105 in: very heavy growth (only if the head is rated for it)

What happens if the diameter is wrong

• Too thick: line may not feed, engine can bog down, head can overheat
• Too thin: line breaks often and wears quickly
• Mixed sizes: uneven feed and frequent tangles

Pick a line shape that matches your cutting conditions

Line shape changes durability, noise, and how aggressively it cuts.

• Round: best all-around; smooth feeding and good durability
• Twisted: quieter, cleaner cut in grass
• Square/star: more aggressive on weeds; can wear faster on hard edges

Quick comparison

What you cut most	Best starting choice	Why it works
Lawn edges, light grass	Round or twisted	Smooth feed, clean cut
Mixed grass and weeds	Round (proper diameter)	Balanced performance
Tough weeds, thick stems	Square/star (proper diameter)	More cutting bite

Why it matters

Using the correct trimmer line helps your trimmer head feed consistently, reduces jams, and improves cutting performance without overloading the engine.

If you need help confirming you are shopping for the correct Craftsman model before ordering supplies, use: how to find your appliance model number (and what it means for parts).

Last updated: February 2026