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SAFEBUILDER NRR 27 Cap-Mount Ear Muffs for Hard Hats (Passive, ANSI S3.19)
$15.74
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EDITORIAL REVIEW: 4.5/5 WC Safety Review — SAFEBUILDER 30dB Ear Muffs Hard Hats Type Safety Earmuffs For Safety Helmet Hearing Protection Earmuffs ANSI S3.19 (Blac Editorial assessment by the WC Safety Editorial T...
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EDITORIAL REVIEW: 4.5/5 WC Safety Review — SAFEBUILDER 30dB Ear Muffs Hard Hats Type Safety Earmuffs For Safety Helmet Hearing Protection Earmuffs ANSI S3.19 (Blac
Editorial assessment by the WC Safety Editorial Team, based on published SAFEBUILDER specifications and category fit. We did not laboratory-test this product.
SAFEBUILDER NRR 27 Cap-Mount Ear Muffs for Hard Hats (Passive, ANSI S3.19) Overview
The SAFEBUILDER cap-mount ear muffs are passive hearing protectors designed to clip into the side accessory slots of a slotted hard hat, putting NRR 27 (ANSI S3.19) attenuation on workers who already wear head protection. These are cap-mount muffs for hard hats, not over-the-head muffs and not behind-the-neck muffs — the arms slide into the helmet's 30 mm accessory channels and the cups swing down over your ears when you need them and lift away when you don't.
Although the listing markets a "30dB" figure, the verified rating for this model is NRR 27, and that is the number to plan around. Like every passive muff, the lab NRR overstates field performance. OSHA and NIOSH both advise derating the label: a common approach is to subtract 7 dB and halve the result, so an NRR 27 muff realistically delivers protection closer to the low double digits at the ear in real industrial use. That still covers a broad range of construction and plant noise, but on the very loudest impulse work you should pair muffs with plugs for dual protection. For a walk-through of the math, see how to calculate NRR and our explainer on what is NRR.
Because they are passive, these muffs have no microphones, no sound amplification, and no AM/FM or Bluetooth — they simply block noise. If you need to hear range commands or amplified low-level sound, look at electronic ear muffs instead. If you want to compare with standard over-the-head and folding options, browse all ear muffs or the wider hearing protection range. Employers managing noise exposure should review the hearing-conservation thresholds in OSHA 1910.95.
What It Is Built For
| Use case | Fit | Buyer guidance |
|---|---|---|
| Hard-hat work with slotted helmet | Ideal | Designed for this — arms clip into the 30 mm slots so you keep head and hearing protection together without removing the helmet. |
| General construction and plant noise | Strong | NRR 27 (derated) covers most moderate-to-loud industrial noise; confirm exposure against your OSHA noise survey. |
| Over-the-head use without a helmet | Not suitable | These are cap-mount only; for bare-head use choose an over-the-head muff from the ear muffs collection. |
| Shooting range / hearing situational commands | Weak | Passive muffs block all sound equally; for range communication use electronic ear muffs that amplify speech. |
| Loudest impulse or sustained high-dBA tasks | Pair with plugs | For exposures above what NRR 27 derated can cover, add foam plugs for dual protection. |
Earmuffs reduce noise, but the labeled NRR is a laboratory number — real-world protection is lower (NIOSH and OSHA both derate it). The muff only protects if the cushions seal fully around the ear: long hair, eyeglass temples, and gaps under a hard-hat-mounted muff all break the seal. In very high noise, wear muffs and earplugs together (dual protection). Electronic muffs amplify quiet sounds and cut loud impulses but still protect only to their rated NRR. OSHA 29 CFR 1910.95 sets the 85 dBA action level; size protection to your measured noise — see how to calculate the NRR you need.
Pros & Cons
Pros
- Cap-mount arms clip directly into slotted hard-hat accessory channels, keeping head and hearing protection on one unit
- NRR 27 passive rating (ANSI S3.19) suits a broad range of construction and industrial noise
- No batteries, electronics, or charging — nothing to fail mid-shift
- Cups swing down to seal and lift up out of the way when noise drops
- Simple, low-cost protection for crews that already wear slotted helmets
Cons
- Cap-mount only — will not work over a bare head or with non-slotted helmets
- Passive design blocks all sound, so it does not let you hear speech or commands like electronic muffs do
- Real-world attenuation is lower than the NRR 27 label once derated per OSHA/NIOSH
- Listing markets a 30dB figure that does not match the verified NRR 27 rating
How It Compares
Within cap-mount hard-hat muffs, SAFEBUILDER sits in the mid-attenuation passive tier. The Radians Def-Guard 23 earmuff is a lower-rated passive option for lighter noise, while Moldex MX-6 over-the-head earmuffs cover bare-head workers who do not wear a slotted helmet. If your crew needs to hear voices or commands while protected, step up to an electronic model such as the Howard Leight Impact Sport electronic ear muffs — but expect to pay more and manage batteries. Compare cap-mount, over-the-head, and folding designs side by side in our best passive ear muffs guide.
Specifications
| Noise Reduction Rating (NRR) | 27 dB (ANSI S3.19) |
| Form factor | Cap-mount (clips to slotted hard hat) |
| Technology | Passive (no electronics) |
| Amplification / Bluetooth | None |
| Cap-mount compatible | Yes — fits standard 30 mm helmet accessory slots |
| Color | Black |
| Brand | SAFEBUILDER |
| Standard | ANSI S3.19 |
| Intended use | Construction / industrial slotted-helmet work |
Related Resources
ear muffs electronic ear muffs hearing protection noise-canceling headsets best passive ear muffs best electronic ear muffs ear plugs vs ear muffs how to calculate NRR what is NRR OSHA 1910.95
Frequently Asked Questions
Are these SAFEBUILDER ear muffs cap-mount or over-the-head?
They are cap-mount muffs. The arms clip into the side accessory slots of a slotted hard hat — they are not designed to be worn over a bare head. If you need over-the-head muffs, browse the ear muffs collection.
What is the actual NRR of these ear muffs?
The verified rating is NRR 27 (ANSI S3.19). The listing markets a 30dB figure, but plan your protection around NRR 27, which is the tested value we cite.
Will real-world protection match the NRR 27 label?
No — lab NRR overstates field performance. OSHA and NIOSH advise derating; a common method subtracts 7 dB and halves the result, putting realistic at-ear protection in the low double digits. See how to calculate the NRR you need for the math.
Do these fit my hard hat?
They fit standard slotted hard hats with 30 mm accessory channels, which covers most common construction helmets. They will not attach to a hard hat without accessory slots, and they cannot be worn without a helmet.
Are these electronic or passive?
Passive. There are no microphones, no sound amplification, and no AM/FM or Bluetooth. They simply block noise. For amplified hearing of speech and commands, look at electronic ear muffs.
Can I hear speech or warnings while wearing them?
Passive muffs reduce all sound equally, so speech is muffled along with noise. If your job requires hearing commands while protected, an electronic muff that amplifies low-level sound is the better tool.
Are these good for shooting or the range?
They will protect your hearing, but passive muffs do not let you hear range commands the way electronic ones do. Shooters who want situational awareness usually choose electronic ear muffs.
Do these meet OSHA hearing-protection requirements?
OSHA 1910.95 requires hearing protection when noise exposure crosses the action level. NRR 27 muffs can be part of compliance, but you must derate the rating against your actual measured exposure. Review OSHA 1910.95 for the thresholds.
Can I wear these with ear plugs for more protection?
Yes. For the loudest tasks, combining these muffs with foam plugs (dual protection) adds attenuation beyond what either provides alone. NRRs do not simply add, so follow the dual-protection calculation in our NRR guide.
Do they need batteries or charging?
No. They are fully passive, so there is nothing to charge and nothing to fail mid-shift. That simplicity is a key reason crews choose passive cap-mount muffs.
How do these compare to over-the-head muffs?
Cap-mount muffs keep head and hearing protection on one unit for helmet wearers, while over-the-head muffs suit bare-head work. For bare-head use, see the Moldex MX-6 over-the-head earmuffs or the full ear muffs collection.
Are these covered by a warranty, and how does shipping work?
These ship and are fulfilled through Amazon, where current pricing, warranty details, and delivery estimates are shown at checkout. Use the Amazon button on this page to confirm availability before you buy.
Written by Steven Eaton, WC Safety Editorial. Specifications sourced from SAFEBUILDER published data. Compare the range in hearing protection.
WC Safety is an independent PPE retailer and Amazon Associate; no paid placement. Match the product to your specific hazard and follow your site PPE program.
Brand / Vendor
SAFEBUILDER
Model / SKU
DL-5007E
Product Type
Earmuffs
Price
$15.74 (Amazon)
Rating
4.29 / 5 — 7 reviews
Availability
Check current availability on Amazon
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Verified Buyer Reviews
Customer Reviews
★★★★☆4.4 / 5· 206 ratings on Amazon
★★★★★
Top quality and performance
"One of the best earmuff sets I've owned. After testing various alternatives, these proved to be the best in terms of quality. Highly recommended!"
Verified Purchaser · May 5, 202 · ✓ Amazon Verified Purchase
★★★★★
Great value safety gear
Good ear muffs. They fit my safety helmet perfectly and block out a lot of noise. Highly recommend if you're looking for reliable hearing protection.
Verified Purchaser · February 9 · ✓ Amazon Verified Purchase
★★★★☆
Great product
Very good for reducing noise it fits on my on my helmet very well. Very good for the price point
Verified Purchaser · January 11 · ✓ Amazon Verified Purchase
★★★★★
Easy to assemble, works great!
Added this item to my hardhat and blocked out the noise. Great fit and easy to assemble!
Verified Purchaser · January 17 · ✓ Amazon Verified Purchase
★★★★★
En mi trabajo hace un ruido infernal, esto es perfecto 👌
Verified Purchaser · June 20, 2 · ✓ Amazon Verified Purchase
★★★★★
Protective.
EXCELLENT PERFORMANCE ISOLATING WORK ENVIRONMENT LOUD NOISE.
Verified Purchaser · June 20, 2 · ✓ Amazon Verified Purchase
★☆☆☆☆
not quality
broke the first time I used them
Verified Purchaser · May 24, 20 · ✓ Amazon Verified Purchase
Showing 7 of 206 Amazon reviews.
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