A-Premium Stretch-Fit Serpentine Belt 4-Rib 35.51 in — EPDM K-Section for GM V8 A/C

The A-Premium 4-rib stretch-fit air conditioning serpentine belt is a 35.51-inch EPDM K-section replacement designed to fit specified GM, GMC, Chevrolet, Hummer and Isuzu models and restore reliable A/C compressor drive performance.

This belt is a direct-replacement-style, stretch-fit serpentine drive for the air conditioning compressor location. Constructed from EPDM with polyester cords, the belt uses a K cross-section and four ribs to match factory pulley profiles. It’s sold under reference numbers like K040355SF and 12603509, and it’s intended for select 2008–2019 V8 gasoline vehicles; always verify fitment for your specific year, engine and model before purchasing.

Which vehicles and engine configurations does this A-Premium belt fit?

This belt is designed for specific GM-family trucks, SUVs and related models with V8 engines where the part was originally used on the A/C compressor location. Fitment covers many Chevrolet Silverado/Tahoe, Cadillac Escalade, GMC Sierra/Yukon, Hummer H2/H3 and certain Isuzu commercial trucks across model years listed. Use the vehicle compatibility checker to confirm your exact chassis and engine match prior to ordering.

• Cadillac Escalade / Escalade ESV / Escalade EXT (2009–2014) — V8 6.2L
• Chevrolet Silverado 1500/2500/3500 and Tahoe (2009–2019) — various V8 4.8L, 5.3L, 6.0L, 6.2L fits
• GMC Sierra 1500/2500 HD, Yukon/Yukon XL, Savana 1500 — compatible V8 engines listed
• Hummer H2/H3 and Isuzu NPR medium-duty trucks with the matching V8s

What are the belt’s key specifications and materials?

This serpentine belt measures an effective length of 35.51 inches with an outside circumference of roughly 36 inches and a top width near 0.56 inches. It follows the K cross-section standard and has four ribs to engage modern A/C compressor pulleys. Materials are chosen to resist heat and environmental degradation for extended service life.

• Effective length: 35.51 in; outside circumference: ~36 in
• Rib count: 4; cross section: K; top width: 0.56 in
• Material: EPDM rubber compound with polyester cord reinforcement
• Reference numbers include K040355SF, 12603509, 19210691 and others for cross-reference

How do stretch-fit belts install and what tools are required?

A-Premium stretch-fit belts are purposely shorter at rest and stretch into place over pulleys during installation. They require a dedicated tensioning or installation tool to stretch the belt safely and seat it correctly. Once installed, the design allows the belt to self-tension under normal engine operation, eliminating the need for aftermarket tensioning adjustments.

• Stretch-fit design appears shorter pre-install; do not force without tool
• Use a belt-stretcher or appropriate tensioning tool for safe installation
• After installation the belt self-tightens and maintains proper tension
• EPDM construction resists heat, ozone and corrosion during service

What warranty and purchase guidance should I consider?

A-Premium backs this engine serpentine drive belt with a one-year unlimited-mileage guarantee for manufacturing defects, giving added confidence in purchase. Before buying, verify compatibility using the product’s fitment tool and the post-search vehicle-specific notes to avoid returns. If your vehicle’s specs don’t match the listed applications, do not purchase.

• One-year unlimited-mileage warranty from A-Premium
• Check vehicle fitment and post-search notes carefully before ordering
• Do not buy if engine displacement, model year, or belt location do not match
• Cross-reference OEM and aftermarket reference numbers when possible

Who this is for: This A-Premium 4-rib stretch-fit serpentine belt is intended for DIY mechanics, independent repair shops and fleet maintainers who work on late-2000s to 2010s GM-family trucks, SUVs, Hummers or compatible Isuzu medium-duty vehicles requiring a 35.51-inch K-section A/C compressor belt. It’s suitable for anyone who needs a factory-profile replacement built from modern EPDM compound and who either has the proper belt-stretching tool or access to a technician who can perform the safe installation. Always confirm exact vehicle fitment before purchase to ensure correct application.