3M E-A-R UltraFit 340-4002 Corded Earplugs NRR 27 50-Pair

The 3M E-A-R UltraFit Corded Earplugs 340-4002 provide NRR 27 hearing protection in a triple-flange, pre-molded corded format with 50 pairs per box — delivering 3M's E-A-R UltraFit reusable earplug in a cost-effective 50-pair bulk packaging for hearing conservation programs requiring a no-roll-down, pre-molded earplug that provides consistent attenuation with straightforward insertion without the foam compression and expansion cycle that roll-down earplugs require. The UltraFit's triple-flange design — three graduated concentric flanges on the earplug body — is the product's defining protection mechanism: the three flanges create three concentric seal points as the earplug is inserted into the ear canal, with each flange contacting the canal wall at a different depth and contributing to the overall acoustic seal. This multi-point seal provides noise attenuation through the combined acoustic resistance of three contact zones rather than the single foam expansion seal of disposable foam earplugs, resulting in consistent NRR 27 attenuation that does not depend on the worker achieving correct roll-down and expansion technique. No-roll-down insertion is the primary compliance advantage of pre-molded flanged earplugs over foam disposables in industrial hearing conservation programs: foam earplugs provide high NRR when inserted correctly — fully compressed, inserted deep, and allowed to fully expand before the worker enters the noise area — but real-world insertion compliance is significantly lower than laboratory conditions because workers insert earplugs while distracted, in a hurry, or without the practice time required to develop consistent insertion technique. UltraFit's pre-molded flanges eliminate insertion technique variability: the worker inserts the earplug until the outermost flange reaches the ear canal entrance, and the three-flange seal is established without dependence on foam expansion quality. The 50-pair corded format combines cost-efficiency with the cord's retention advantage: the cord connecting the two earplug pods allows workers to hang the earplugs around their neck during quiet phases without losing them, maintains sanitation by preventing earplug-to-ground contamination, and supports the rapid-reinsertion access that hearing protection compliance in intermittent noise environments benefits from. The 50-pair box packaging provides sufficient quantity for large industrial program restocking with fewer procurement events than smaller-pack formats.

3M E-A-R UltraFit 340-4002 Corded Earplugs NRR 27 50-Pair Box — Key Features

• NRR 27 — effective attenuation for industrial noise environments
• Triple-flange pre-molded design — three-point acoustic seal without roll-down technique
• Corded format — retention cord for neck-hang storage and retrieval between noise zones
• 50-pair box — bulk packaging for industrial program restocking
• Reusable construction — cleanable for multi-shift service life per pair

Specifications

Triple-Flange Pre-Molded Design: Consistent Attenuation Without Insertion Technique

Hearing protection effectiveness in real industrial use depends on the earplug's attenuation capability and on whether workers achieve the insertion quality that produces the rated attenuation. The gap between laboratory NRR values and real-world field attenuation has been documented extensively in occupational hearing research: foam roll-down earplugs with high NRR values (32-33) achieve significantly lower real-world attenuation when workers do not compress the foam sufficiently, do not insert the plug deeply enough, or allow the foam to expand before inserting — common variations that reduce the effective attenuation by 10-15 dB below the labeled NRR. Industrial hygienists managing hearing conservation programs account for this variability in protection selection, often recommending the NIOSH derated NRR calculation or using field attenuation evaluation (fit testing) to verify actual worker protection levels. Pre-molded triple-flange earplugs address insertion technique variability by establishing their protective seal mechanically rather than through foam expansion dynamics: the three graduated flanges create defined contact points at the canal wall that produce consistent acoustic seal regardless of insertion speed, technique variation, or experience level. A worker who inserts the UltraFit quickly and with minimal preparation achieves the same multi-flange seal as a worker who inserts carefully — reducing the attenuation variability across a diverse workforce and across different insertion moments during a shift. NRR 27 on the UltraFit reflects consistent attenuation through this technique-independent insertion mechanism: the actual field attenuation from consistent insertion should more closely track the labeled NRR than foam disposables whose real-world values depend on insertion technique consistency. For hearing conservation programs where consistent worker protection documentation is a compliance priority and where foam insertion variability is a known program challenge, the UltraFit's pre-molded design provides the attenuation consistency that supports reliable exposure reduction verification.

Compliance and Certifications

• NRR 27 — Noise Reduction Rating per ANSI S3.19
• OSHA 29 CFR 1910.95 — Occupational noise exposure requirements

Real-World Benefits

Triple-flange pre-molded insertion eliminates the technique variability that reduces foam earplug field attenuation — providing consistent NRR 27 protection for workers regardless of insertion speed and technique, supporting more reliable hearing conservation documentation across diverse workforces. Industrial hygienists who have conducted fit testing programs and identified high variability in foam earplug field attenuation find UltraFit's technique-independent insertion more consistently achieves labeled NRR in real-use conditions — reducing the exposure margin uncertainty in hearing conservation program calculations.

50-pair corded bulk format reduces restocking frequency for industrial programs while cord retention supports the rapid reinsertion compliance that intermittent noise environments require. Hearing conservation coordinators who manage large industrial programs find 50-pair boxes reduce the procurement and receiving frequency of smaller-pack orders — while the cord allows workers to keep UltraFit accessible around their neck during quiet phases for immediate reinsertion when re-entering noise areas.

Applications and Use Cases

• Industrial manufacturing — NRR 27 bulk reusable hearing protection for production programs — E-A-R UltraFit 340-4002 for manufacturing facilities with consistent high-noise environments where hearing conservation programs require bulk restocking of reusable earplugs providing reliable NRR 27 attenuation with consistent insertion for diverse worker populations
• Construction and heavy equipment — corded reusable hearing protection for intermittent noise — triple-flange corded UltraFit for construction and equipment operation workers who need consistent protection for high-noise tool and equipment operation phases with rapid reinsertion access when moving between noise areas
• Hearing conservation program bulk restocking — 50-pair format for large workforce supply — 50-pair boxes for industrial hygiene and safety programs managing hearing protection supply for large workforces where bulk packaging reduces procurement overhead and per-pair cost relative to small-pack formats

Related Products

For corded reusable multi-flange earplugs NRR 25 in 5-pair pack, see 3M 1270 Reusable Corded Earplugs NRR 25. For no-roll push-in uncorded foam earplugs NRR 28 in 100-pair box, see 3M E-A-R Push-Ins 318-1000 Uncorded Earplugs NRR 28. For banded hearing protector for intermittent noise, see 3M 1310 Banded Hearing Protector Reusable. Browse the complete Hearing Protection collection.

Frequently Asked Questions

How does NRR 27 compare to foam earplug NRR 32-33 for hearing protection selection?

NRR values compare rated attenuation under laboratory conditions. Foam earplugs achieve NRR 32-33 through full foam expansion in the canal, but real-world attenuation is significantly lower than labeled NRR when workers achieve imperfect insertion — studies document real-world attenuation of 10-15 dB below labeled NRR for foam earplugs in actual industrial use. UltraFit's pre-molded triple-flange achieves NRR 27 under consistent insertion that doesn't require foam expansion technique. Depending on the worker population and their foam insertion technique consistency, UltraFit's lower labeled NRR may provide equal or better actual field attenuation than higher-NRR foam earplugs with poor technique. For selection, consider both the labeled NRR and the realistic field attenuation for your specific workers — fit testing can verify actual attenuation.

What is the correct way to insert the E-A-R UltraFit?

Reach over the head with the opposite hand and gently pull the outer ear upward and back to straighten the ear canal — this positions the canal for earplug insertion. With the other hand, hold the earplug stem and insert the three-flange tip into the canal entrance, pushing gently until the outermost flange is flush with or slightly inside the canal entrance. The three flanges should create a comfortable seal without pain. If the earplug does not feel secure or you hear excessive ambient noise, reinsert with the canal-straightening technique to ensure the flanges are sealed against the canal walls. Verify insertion quality in 3M's UltraFit product instruction materials.

How long does each pair last before replacement?

Reusable pre-molded earplugs should be replaced when they show physical degradation — hardening or stiffening of the flange material that reduces flange flexibility and seal effectiveness, tears or deformation of the flanges, or visible contamination that cleaning does not remove. Under normal use with daily cleaning, pre-molded earplugs typically provide one to several weeks of service per pair depending on work environment and hygiene practices. Replace on a scheduled basis (weekly or monthly) or when inspection reveals degradation. The 50-pair box format supports a scheduled replacement program that maintains fresh earplugs through regular rotation without per-pair cost pressure.

Is the corded version required for OSHA compliance or a program preference?

OSHA does not specifically require corded earplugs — the corded format is a practical preference for specific work environments where uncorded earplugs would be lost, dropped into processes or machinery, or where the cord supports the intermittent wear pattern of moving between noise and communication zones. For environments where losing earplugs into machinery, products, or processes creates safety or contamination concerns (food processing, precision manufacturing with FOD controls), corded hearing protection prevents earplug loss from becoming a secondary hazard. The cord is a program management and practical compliance tool rather than a regulatory requirement in most applications.