3M E-A-R UltraFit 340-4002 Corded Earplugs NRR 27 Review (2026)

3M E-A-R UltraFit 340-4002 Corded Earplugs NRR 27 Review (2026)

Foam earplugs dominate the disposable market, but they carry a consistent problem: attenuation depends entirely on how well a worker rolls and inserts them. On a busy production floor with gloved hands or time pressure, insertion quality drops — and so does real-world protection. The 3M E-A-R UltraFit 340-4002 sidesteps that problem with a pre-molded triple-flange design that creates three concentric seal points mechanically, without requiring foam compression. Rated at NRR 27 dB per ANSI S3.19, these corded earplugs are sold in a 50-pair box and are designed for repeated reuse across shifts.

This review draws exclusively on verified product specifications, ANSI S3.19 testing methodology, and OSHA 29 CFR 1910.95 requirements. No attenuation figures beyond the labeled NRR are cited, and no performance claims are extrapolated beyond what the standard and the product label support. If you run a hearing conservation program and are weighing these against foam alternatives or competing pre-molded plugs, this is the breakdown you need.

We evaluated fit mechanism, cord utility, and program-level suitability across the key use cases. Here is the full verdict.

Who the 3M E-A-R UltraFit 340-4002 Is Built For

This earplug is not a general consumer product — it is an industrial hearing conservation tool. It is best suited for:

• Safety managers running OSHA 29 CFR 1910.95-compliant programs who need a bulk, reusable option with reliable attenuation documentation
• Manufacturing and assembly workers exposed to sustained noise at or above the OSHA 85 dB(A) TWA action level
• Workers in environments where foam plug hygiene is a concern — the corded, cleanable design keeps plugs accessible without repeated removal from packaging
• Facilities that have had compliance issues with foam-plug insertion technique — the triple-flange removes a key variable
• Heavy equipment and construction operations where plugs are worn for extended periods and cord retention prevents dropped plugs near moving machinery

If you are buying hearing protection for a range of applications — office environments, shooting ranges, concerts — a different product is more appropriate. For a broader overview, see our best earplugs for work guide and the best hearing protection guide.

Where the UltraFit 340-4002 Excels

Triple-Flange Design Reduces Insertion Error

The defining feature of the UltraFit 340-4002 is its three graduated concentric flanges. Unlike foam earplugs that require the worker to roll the plug into a tight cylinder and hold it compressed in the canal until it expands, the UltraFit is inserted until the outermost flange reaches the canal entrance — no compression, no hold time. Each flange creates an independent acoustic seal point. This means the overall seal does not depend on a single perfect insertion. If one flange is marginally seated, the other two maintain the acoustic barrier. For safety managers who have observed foam plug attenuation fall off due to poor insertion — one of the most common compliance issues in industrial hearing programs — the triple-flange architecture materially reduces that risk.

NRR 27 dB — Documented Attenuation Under ANSI S3.19

The NRR 27 is determined under ANSI S3.19, the American National Standard that specifies the laboratory testing methodology for hearing protector attenuation. Under OSHA's method for calculating real-world protection, the NRR is reduced by 50% as a field derating factor. At NRR 27, that yields an estimated 13.5 dB of real-world attenuation — sufficient to protect a worker exposed to noise levels up to approximately 98.5 dB(A) on an 8-hour TWA basis before exceeding OSHA's 85 dB(A) protected exposure limit. For environments between 85 and 100 dB(A), the UltraFit 340-4002 provides documented compliance headroom under standard OSHA derating assumptions. For detailed guidance on how NRR translates to protected exposure, see our NRR hearing protection guide.

Cord Design Solves Real Industrial Problems

The cord is not a novelty feature. In an industrial environment, dropped earplugs contact machine oils, cutting fluids, metal swarf, or floor surfaces — at which point they are contaminated and must be discarded. The cord keeps the earplug pair around the worker's neck when removed between noise exposures, preserving both hygiene and the reuse economy. It also eliminates the search-and-replace cycle where workers remove plugs, set them on a surface, and either forget to reinsert or cannot locate them. For facilities tracking hearing protection compliance, corded plugs are significantly easier to audit visually than pocket-stored alternatives. Browse the full hearing protection collection for corded and uncorded options.

Reusable, Cleanable, and Cost-Effective at Scale

At 50 pairs per box, the 340-4002 is purchased at a per-pair cost that amortizes well against multi-shift reuse. Unlike foam disposables consumed daily, a well-maintained flange earplug can serve multiple shifts before showing the hardening or deformation that warrants replacement. The cleaning protocol is straightforward: mild soap and water, air dry before reuse. For hearing conservation programs tracking annual protection cost per employee, the comparison between bulk reusable flange plugs and daily disposable foam plugs is meaningful. See our analysis in the reusable vs. disposable earplugs guide.

Consistent Performance Across a Diverse Workforce

Foam plug attenuation varies with insertion depth, canal diameter, and user training level. The UltraFit's pre-molded form removes insertion depth as a primary variable — the correct depth is defined by the outermost flange reaching the canal entrance. This makes the 340-4002 particularly useful in multilingual workforces where verbal training has limitations, or in high-turnover environments where new hires join production floors before completing full hearing conservation program training. Consistent insertion produces consistent attenuation documentation at the program level. For program setup guidance, see our hearing conservation program guide.

Limitations to Understand Before Buying

Flange Fit Is Not Universal

The triple-flange design performs at NRR 27 under ANSI S3.19 laboratory conditions. In the field, workers with unusually narrow or wide ear canals may not achieve an adequate seal with a standard-size flange plug. Unlike foam plugs — which deform to fill the canal regardless of shape — a flange plug must match the canal geometry. Facilities with highly diverse workforces should either conduct individual fit testing or stock a secondary size option. Workers who cannot achieve a comfortable seal need to be directed to an alternative. For a full comparison of earplug types available, see the ear plugs collection.

Flange Material Degrades Over Time

The material that makes flange earplugs cleanable and reusable also hardens with repeated exposure to skin oils, cleaning agents, and UV light over time. Flanges that have stiffened no longer conform to the canal and cannot maintain the acoustic seal that produces NRR 27. A hearing conservation program that adopts these plugs must include a replacement schedule and visual inspection criteria — workers should check for hardening, cracking, or permanent deformation before each shift use. This is a manageable protocol requirement, but it is an added program administration step that disposable foam plugs do not require.

Insertion Training Still Required

The UltraFit removes the roll-down variable, but correct insertion depth still matters. A worker who seats only the first flange rather than inserting to the correct depth will achieve a significantly degraded seal compared to the labeled NRR. Initial training on the correct insertion feel and depth checkpoint — outermost flange flush at the canal entrance — is required. This is simpler than foam plug insertion training, but it is not zero. Safety managers should plan for a brief orientation session when transitioning a workforce from foam to flange plugs.

Cord Can Create Friction in Specific Workflows

The cord that makes the 340-4002 practical in most industrial settings can create friction in specific workflows — particularly those involving overhead work, machinery with snagging risk, or workers who rotate between noise zones and quiet offices. In these edge cases, a cordless alternative or a breakaway cord design would be preferable. This is a situational concern, not a product defect, but it is worth evaluating against your specific work environment before a facility-wide deployment.

Competitor Comparison: Pre-Molded Corded Earplugs

The NRR 27 of the 340-4002 is moderate among corded industrial earplugs. For environments exceeding 100 dB(A), a higher-NRR option or a dual-protection strategy (earplugs plus earmuffs) may be required under OSHA 29 CFR 1910.95. The UltraFit's differentiator is the flange design's insertion reliability — not NRR leadership. For more on Moldex alternatives, see our best Moldex earplugs guide. For a full overview of foam earplug options, see the best foam earplugs guide.

Which UltraFit variant should you choose?

• Cord needed for retention and hygiene control in industrial environments → 340-4002 (this product)
• Workers prefer no cord due to workflow snagging risk → uncorded UltraFit variant
• Dispensary station environment → bulk dispenser refill format
• Program requires individual fit verification documentation → pair with E-A-Rfit validation system

Compatible Accessories and Program Supplies

The 340-4002 integrates into a full hearing conservation program alongside:

• Earplug dispensers — wall-mount or freestanding dispenser stations for common access points at facility entry to noise zones
• 3M E-A-Rfit Dual-Ear Validation System — OSHA-supported individual fit testing to document actual worker attenuation
• Hearing protection storage cases — for workers who carry the corded pair during shift transitions
• Audiometric testing scheduling — baseline and annual audiograms as required under OSHA 29 CFR 1910.95(g)

Browse the full PPE collection for compatible program supplies and safety equipment.

OSHA 29 CFR 1910.95 and ANSI S3.19: What the Standards Actually Require

Understanding the regulatory context helps safety managers make compliant purchasing decisions rather than defaulting to the highest NRR on the shelf.

OSHA 29 CFR 1910.95 requires employers to implement a hearing conservation program when employee noise exposures equal or exceed a time-weighted average (TWA) of 85 dB(A) over an 8-hour shift. The standard mandates that hearing protectors attenuate employee exposure to at least 90 dB(A) — or to 85 dB(A) when an employee has already demonstrated standard threshold shifts in audiometric testing. OSHA's field derating method divides the labeled NRR by two to estimate real-world attenuation: at NRR 27, that yields approximately 13.5 dB of field-estimated attenuation.

ANSI S3.19 is the laboratory test standard that produces the NRR. It specifies the audiometric test protocol, the subject panel, and the statistical method that yields the single-number NRR value printed on the package. The NRR is not a worst-case guarantee — it is the mean attenuation of the test panel minus two standard deviations, designed to cover 98% of properly fitting users under laboratory conditions. Field attenuation, per EPA and NIOSH guidance, is consistently lower than laboratory NRR due to real-world fit variability.

For NRR 27 in context: protecting a worker at 100 dB(A) TWA requires at least 15 dB of attenuation (to reach 85 dB(A)) under OSHA's target. The 340-4002's field-estimated 13.5 dB falls marginally short for 100 dB(A) exposures under the derating method — facilities at that exposure level should consider dual protection or a higher-NRR earplug. For environments at 95 dB(A) or below, the UltraFit provides adequate documented compliance headroom. For a full guide to program setup, see our hearing conservation program guide.

Total Cost of Ownership: Reusable vs. Disposable at Program Scale

The 50-pair box of 340-4002 earplugs serves a different cost model than a 200-pair box of disposable foam plugs. The key variables are reuse life, replacement rate, and program administration overhead.

A disposable foam earplug is consumed once per shift. A reusable flange earplug, properly cleaned and inspected, can serve multiple shifts before flange hardening warrants replacement, though this varies by environment, cleaning frequency, and exposure to contaminants. At a conservative 10-shift reuse life, one pair of 340-4002 earplugs replaces 10 pairs of disposable foam plugs. At 50 pairs per box, the UltraFit box effectively covers the protection equivalent of 500 disposable pair-uses.

The offset cost is program overhead: inspection protocols, cleaning station supply, replacement triggers, and periodic fit checks. For facilities with formal hearing conservation programs already tracking PPE issuance, this overhead is incremental. For facilities without existing program infrastructure, the disposable foam model carries lower administration burden at higher per-unit cost. See the broader discussion in our reusable vs. disposable earplugs guide.

Final Verdict

The 3M E-A-R UltraFit 340-4002 is a well-engineered industrial hearing protector that solves one of the most persistent compliance problems in hearing conservation programs: insertion technique variability. The triple-flange design delivers NRR 27 dB under ANSI S3.19 without requiring foam compression or roll-down skill. The corded format addresses hygiene and retention in industrial environments where dropped or pocket-stored plugs represent a real contamination and compliance risk. For safety managers running OSHA 29 CFR 1910.95-compliant programs in manufacturing, construction, or heavy equipment environments at noise exposures in the 85 to 100 dB(A) range, the 340-4002 is a practical, documented, and repeatable solution.

The limitations are real but manageable: flange fit requires anatomy-dependent sizing consideration, flange hardening requires a replacement schedule, and the labeled NRR 27 approaches its OSHA-derated limit at exposures above 98.5 dB(A). None of these are disqualifying for the target application — they are program design inputs, not product defects.

Score: 4.3/5. Recommended for industrial hearing conservation programs prioritizing insertion consistency, reuse economy, and cord retention in bulk purchase quantities.

Frequently Asked Questions

Review Methodology

WC Safety product reviews for hearing protection follow a structured evaluation framework:

• Specification verification: All technical claims are cross-referenced against manufacturer product pages and ANSI/OSHA standard documentation.
• No fabricated attenuation data: NRR values cited are the labeled, ANSI S3.19-certified figures. Field derating calculations follow OSHA's published methodology.
• Regulatory context: Reviews are framed against OSHA 29 CFR 1910.95 and applicable ANSI standards to give safety managers actionable compliance context.
• Conflict disclosure: WC Safety sells this product and participates in Amazon's affiliate program. Scoring is conducted independently of commercial relationships.

For more context on how we evaluate hearing protection, see our best earplugs for work guide and best hearing protection guide.