N90338

338 O-RING NITRILE (NBR, BUNA)
90 DUROMETER BLACK
CS: .210″ (5.33MM)
ID: 3.100″ (78.74MM)

N90338

Quantity Pricing (ea)
  • 1 for $1.36
  • 60 for $1.23
  • 300 for $1.09
  • 600 for $0.95
  • 1200 for $0.82
Stock & Availability (ea)
In Stock: 1,540
Inbound Stock: 3,800
Qty Available
1,800 09/21/2026
2,000 10/20/2026
Offsite Stock: 0 ($50 Line Min)
New Production: Unlimited ($250 Line Min)
Expedited Shipping*: 08/03/2026
Standard Shipping: 10/21/2026
*Add your desired qty and click ADD TO CART to see expedite fees and options.

Interchange Part Numbers

  • MCMASTER-CARR 5308T369

Детали

Вес 0.01715 фунт
Shipping Dimensions 3.52 × 3.52 × 0.21 дюйм
Material

Color

Size

338
Durometer

Minimum Temperature -13
Maximum Temperature 250

Описание

Product Drawing: N90338.pdf

SPEC SHEET: Nitrile (Buna) 90 Durometer.pdf

Nitrile Rubber (NBR)

Material Description

Nitrile rubber (NBR) also known as Buna N is one of the most commonly used sealing elastomers due to its resistance to petroleum-based fuels and lubricants and its relatively low price. Nitrile elastomers are copolymers of acrylonitrile and butadiene. There are a number of common variations of nitrile compounds.

Acrylonitrile Content

The acrylonitrile (ACN) content of the polymer chains can vary from 18% to 50%. Lower ACN content gives better low-temperature properties but inferior resistance to fuels and polar lubricants. Higher ACN content gives lesser quality low-temperature properties but improved fuels and polar lubricants resistance. Standard NBRs typically have 34% ACN content.

Cure system: Sulfur-cured

Standard Nitriles are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Peroxide-cured nitriles have better heat resistance and lower compression sets but are more expensive and more difficult to process.

Temperature Range:

Standard Low Temp: -40&degC (-40&degF)
Standard High Temp: 100&degC (212&degF)