3M Earplug - Ultrafit Earplug 340-4004 | Buy online

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3M Earplug - Ultrafit Earplug 340-4004  | Buy online 3M Earplug The 3M™ E-A-R™ UltraFit™ Earplugs are reusable and designed for insertion into the ear canal to help reduce exposure to hazardous levels of noise...
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3M Earplug - Ultrafit Earplug 340-4004  | Buy online

3M Earplug

The 3M™ E-A-R™ UltraFit™ Earplugs are reusable and designed for insertion into the ear canal to help reduce exposure to hazardous levels of noise up to 32 dB.

Get comfortable, durable and reusable hearing protection with 3M™ E-A-R™ UltraFit™ Earplugs. A proven triple-flange design made of a pliable pre molded elastomeric polymer fits most ear canal sizes. They reduce noise levels by 32 dB and can be cleaned easily with soapy water and reused again and again – helping decrease waste. Each set of plugs is supplied with a pre tipped cord meaning you can insert and have corded or remove and have uncorded, giving you the option to wear as you choose.

Simply hold the stem and push the earplug into the ear. The tip stays clean even if hands are dirty or gloves are worn. The soft polymer earplugs are washable and reusable so they don’t need to be replaced as often, reducing waste and lowering costs. Poly bag keeps earplugs clean prior to use.

Product Details

  • Reduces noise levels up to 32 dB
  • Patented tri-flange design in pre-moulded material makes them a fit for most ear canals
  • Firm, long stem for easy insertion and removal
  • Made from soft and durable material
  • Separate cord which can be removed and reinserted for optional uncorded or corded wear
  • Compatible with the 3M™ E-A-Rfit™ Dual-Ear Validation System
  • *U.S. EPA specifies the NRR as the measure of hearing protector noise reduction. However, 3M makes no warranties as to the suitability of the NRR for this purpose. 3M strongly recommends personal fit testing of hearing protectors. Research suggests that users may receive less noise reduction than indicated by the attenuation label value(s) on the packaging due to variation in fit, fitting skill, and motivation of the user. Refer to applicable regulations or guidance on how to adjust attenuation label values. It is recommended that the NRR be reduced by 50% to better estimate typical protection.
  • Vinyl or cloth material options for cords
  • Easy to use- hold the stems to insert the triple flange ear tips into the ear canals. One size designed to fit most. Options include with or without cord to suit user preference. Cord material options include vinyl or cloth. EARfit testable to help validate the level of protection the individual user is getting.
25 Decibel
Attenuation rating (SNR)
32 Decibel
Case Quantity
200 Pair, 2000 Pair, 320 Pair, 400 Pair, 500 Pair
Color Family
Blue, Multi-color, Yellow
Cord Color
Blue, Red, White
No, Yes
Cord Material
Cloth, Metal Detectable Cord, Vinyl
Cord Type
Metal Detectable Cord, None, Vinyl
Dispenser Available
Earplug Color
Blue, Yellow
Earplug Material
Elastomeric Polymer, Silicone
Earplug Size
Electrically Insulated
No, Yes
Green Certification or other Recognition
Green Environmental Attribute
Hearing Protection Style
Corded, Earplug, Uncorded
Hearing Protection Type
Eartips, In ear
Insertion Style
No Roll
ABS/Elastomeric Polymer, Silicone
Metal Detectable
No, Yes
Moisture Resistant
No, Yes
National Stock Number
6515013526221, 6515013620300
Overall Height (Imperial)
9.1 in
Overall Height (Metric)
23.11 cm
Overall Length (Imperial)
21.9 in
Overall Length (Metric)
55.63 cm
Overall Width (Imperial)
8.7 in
Overall Width (Metric)
22.1 cm
Box, Paper Bag, Poly bag, Vending Pack
Pairs Per Package
100, 200, 5, 50, 80 pairs per box
Product Color
Blue, Yellow
Product Type
Recommended Application
Assembly, Blasting, Cleaning, Composite Finishing, Demolition, Electrical, Facility Maintenance, Final Finish, Grinding, Machine Operations, Paint Preparation, Painting, Sanding, Welding
Recommended Industry
Automotive, Construction, Food and Beverage Manufacturing, Food Industry, Food Safety, General Manufacturing, Manufacturing, Marine, Metal Fabrication, Military Maintenance, Military Maintenance, Repair and Operation (MRO), Mining, Oil & Gas, Pharmaceutical, Repair and Operation (MRO), Transportation
Roll-Down Required
One Size Fits Most
Slow-Recovery Foam
No, Yes


Recommended applications include assembly and mechanical, chipping, chiseling, cleaning, drilling, furnace operations, grinding, heavy equipment operations, machining, metal repair, painting, pouring/casting, power fastening, riveting, sanding, sawing and welding. These earplugs are commonly used in the following industries: construction, general manufacturing, mining, oil and gas, and transportation.