119 O-Ring Buna-N 90A 15/16 in ID 1-1/8 in OD - Bulk Pack

In this review the 119 O-Ring in black Buna-N with a 90A durometer is evaluated for workshop and field sealing tasks; it is targeted at technicians, hobbyists and maintenance crews who need a large bulk supply of tough O-rings for petroleum and hydraulic-related applications. The single biggest reason to buy is the combination of material compatibility and quantity: a pack of 500 provides a ready supply of AS568A-size rings that resist abrasion, tearing and compression set, making them a practical choice when durability and spare inventory matter.

Key Features

• Material: Buna-nitrile (Buna-N) offers compatibility with petroleum, HFC fluids, vegetable oil and many aliphatic hydrocarbons for versatile sealing use.
• Hardness: 90A durometer gives a firmer, more wear-resistant seal that holds shape under compression in demanding applications.
• Temperature range: Rated from -40 degrees F to 212 degrees F, so the rings function across cold storage and typical engine or hydraulic temperatures.
• Standard sizing: Meets AS568A aerospace size standard so the 15/16 in ID and 1-1/8 in OD dimensions fit common gland designs and replacement tasks.
• Cross-section: Round profile creates a consistent seal between cylindrical overlapping surfaces for couplers, hose fittings and quick disconnects.
• Bulk supply: Pack of 500 provides cost-effective inventory for maintenance shops, preventing downtime from missing spare rings.

Who It's For

This pack is best for maintenance technicians, agricultural and boating owners, and hydraulic or pneumatic repair shops that replace O-rings frequently or retrofit multiple couplers and fittings. It suits anyone who values durability and a firmer seal when working with petroleum-based fluids or common hydraulic media.

Those who should look elsewhere include users needing extreme low-temperature elastomers, applications exposed to ozone or sunlight for long periods, or systems that require elastomers specifically rated for strong solvents like acetone, ethers or esters; Buna-N is vulnerable to those agents and weathering over time.

Pros & Cons

Pros

• Good value: the 500-count pack reduces per-unit cost for frequent replacement or stocking.
• Durable: customers report heavy-duty performance and reliable sealing on couplers and garden hose fittings.
• Wide compatibility: suitable for petroleum, vegetable oil, HFCs and many aliphatic hydrocarbons used in industry.
• Consistent fit: meets AS568A dimensions so rings fit standard glands and quick disconnects.

Cons

• Firm hardness: at 90A some users find the rings quite stiff, which can make initial installation trickier compared with softer compounds.
• Not resistant to solvents like acetone or prolonged ozone and sunlight exposure, limiting outdoor longevity in some conditions.

Specifications

Material	Buna-nitrile (Buna-N)
Durometer	90A
Inner Diameter	15/16 in
Outer Diameter	1-1/8 in
Width	3/32 in
Temperature Range	-40 degrees F to 212 degrees F
Quantity	Pack of 500

Our Verdict

The 119 Buna-N 90A O-ring pack is a practical buy for shops and owners who need a large, durable supply of standard-size seals that work well with petroleum and hydraulic fluids. While the 90A hardness can feel stiff at first, the rings deliver abrasion and compression resistance and represent solid value when matched to compatible fluids and environments.

Frequently Asked Questions

Are these O-rings compatible with petroleum-based oils?
Yes. Buna-N is compatible with petroleum and many aliphatic hydrocarbons, making these rings suitable for common oil and fuel sealing tasks.

Will they work in cold temperatures?
Yes. The rated temperature range extends down to -40 degrees F, so they remain functional in most cold-weather applications.

Do they resist sunlight and strong solvents?
No. Buna-N is vulnerable to ozone, sunlight and solvents like acetone and some esters, so avoid prolonged outdoor exposure and aggressive solvent contact.