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7-Tooth Chainsaw Rim Sprockets (3/8-7, .325-7 & P-7 Spline) 3/8-7 · Small Bore (
PART #: SPR-38-7-SM2·BRAND: Tool Shed·● In stock

3/8-7 Chainsaw Rim Sprocket, 3/8 in. Pitch, 7-Tooth, 20 mm 7-Spline Bore (2-Pack)

Precision 7-tooth floating rim sprockets in 3/8-7 (20 mm small bore and 23 mm large bore), .325-7 and 3/8 Picco (P-7) spline sizes.

$12.99/ 2-pack ($6.50 ea.)

Select Specification (4 sizes stocked):

US Warehouse Dispatch:Ships from Waltham, MA in 2-5 business days; delivered in 7-14 business days.
Freight Rate:Free US ground shipping on orders $80+ ($8.95 flat rate under $80).
Returns & Guarantee:Free 30-day returns with prepaid return label (Return policy).

Technical Specifications

Size3/8-7 · Small Bore (20 mm ID) (35.05 mm)
Thickness0.24 in. (6.1 mm)
Arbor size20 mm (7-spline)
MaterialCase-hardened sintered alloy steel
Stamped model3/8-7
Chain pitch & teeth3/8 in. · 7 teeth
Outer diameter (OD)35 mm (1.38 in.)
Inner spline bore (ID)20 mm (0.79 in.) Small 7-Spline
Rim thickness6 mm (0.24 in.)
Pack quantity2
Shipping weight0.22 lb
Country of originUnited States
SKUSPR-38-7-SM2

Product Details & Fitment

Floating 7-tooth chainsaw rim sprockets allow the saw chain to self-align with the guide bar groove, reducing rail wear and power loss.

Verified bore and outer dimensions

Check your clutch drum spline size before ordering: the Small 7-Spline (SD7) bore measures 20 mm (0.79 in.) inside diameter with a 6 mm thickness, while the Standard 7-Spline Large Hole measures 23 mm (0.91 in.) inside diameter with a 7.5 mm thickness. Both 3/8-7 models have a 35 mm (1.38 in.) outer diameter.

When to replace your rim sprocket

Replace the rim sprocket every two saw chains or whenever wear grooves on the drive teeth exceed 0.5 mm (0.020 in.).