Skip to main content
Home › Guides › Head › Studson SHK-1 questions
Guide · Head · Studson SHK-1 safety helmets

Studson SHK-1 questions answered: full brim or standard brim, vented or non-vented, Class C or Class E, HighBar, ANSI and CSA dual certification, weight, service life, pad care, Koroyd, Twiceme and Fidlock

The Studson SHK-1 is a Type II industrial safety helmet: Studson lists it as ANSI/ISEA Z89.1-2014 (R2019) Type I and Type II, with the vented shell carrying Class C (no electrical rating) and the non-vented shell Class E (proof tested at 20,000 volts). It comes as a full brim or a standard (cap-style) brim, in a Fidlock magnetic-buckle version, a HighBar dial-adjustable chin strap version and an ANSI plus CSA Z94.1 dual-certified full brim. Studson states a 3-year warranty, a field-use lifespan of 3 to 5 years and a shelf life of up to 10 years from the manufacture date, and the whole line is stocked here with the part number, color and size on each page.

Bayshore Safety. Industrial safety and PPE supplier since 2017. · Current as of November 2026 · the Studson SHK-1 product pages and the SHK-1 Full Brim, Standard Brim and accessory spec sheets (studson.com, fetched Nov 10 2026) and the Studson 2026 price file; ANSI/ISEA Z89.1-2014 (R2019) as Studson states it; OSHA Safety and Health Information Bulletin on safety helmets (March 6 2024, advisory); 29 CFR 1910.135 and 1926.100
Studson SHK-1 helmets and parts we stockHard hat selector
Studson SHK-1 Full Brim Vented Type II Hard Hat, Class C, 15 ColorsStudson SHK-1 Full Brim Vented Type II Hard Hat, Class C, 15 ColorsStudson lists the full brim vented SHK-1 as Type I and Type II, Class C, with EN 12492:2012 clauses, at 545 g
$130.00See the product

Why one helmet draws this many questions. The SHK-1 is sold in ten configurations that differ only in brim, venting, chin strap and certification, and the questions people ask (which one is Class E, does it come as a full brim, what does it weigh, how long is it good for, what is the chip in the shell for) are the differences between those ten. This page answers them from Studson’s own product pages and spec sheets, in the order they come up, and lists every version with its part number and current price. The Z89.1 types and classes themselves are covered in the live guides linked at the end; this page is about what Studson states for this helmet.

The SHK-1, question by question

Figures are Studson’s, as printed on the product page for each version; where the spec sheet and the product page differ, the product page figure is the one on our listing.

Does Studson make a full brim hard hat?Yes. The SHK-1 Full Brim is the larger of the two shells, with what Studson calls 360-degree rain and sun coverage, and it is sold vented (SHK1-FB-C, Class C) and non-vented (SHK1-FB-E, Class E), in a carbon-finish colorway, with the HighBar chin strap, and as the ANSI plus CSA dual-certified version. The standard brim (SHK1-C vented, SHK1-E non-vented) is the cap-style shell with a short front peak. Studson states that face shields, brackets and sun brims are specific to one shell or the other, so the brim decides which accessories fit; the safety glasses and the ED-3B ear defender fit both.
Is the SHK-1 Type I or Type II?Studson lists every SHK-1 as ANSI/ISEA Z89.1-2014 (R2019) Type I and Type II. Type II is the rating that matters: in Z89.1 a Type II helmet is tested for impacts to the top and to the sides of the head, where a Type I hard hat is tested for the top only. The ANSI-only versions also list clauses of EN 12492:2012, the European mountaineering-helmet standard, for shock absorption (front, lateral and rear), penetration and the retention system; the HighBar versions do not list EN 12492, and no SHK-1 is listed to EN 397.
Which SHK-1 is Class E, and why can’t the vented one be?The non-vented shells are Class E (Studson states 20,000 volts AC proof testing, the highest electrical class in Z89.1); the vented shells are Class C, which carries no electrical rating at all. Studson’s own wording is that a vented helmet cannot achieve Class E because the vents open a path through the shell, so the choice is made by the hazard assessment: near exposed conductors the non-vented Class E helmet is the one the rule contemplates, and in the heat with no electrical exposure the vented Class C shell is the cooler one. There is no Class G SHK-1.
What is the HighBar chin strap?HighBar is Studson’s dial-adjustable chin strap system: a grip-ring dial tightens and loosens two arms that sit above the jaw, with a padded chin cup, in place of fabric straps and a buckle. Studson states the arms are an anti-microbial nylon blend that does not absorb sweat and flip up out of the way when not in use. It is sold only on the full brim (SHK1-FB-C-HB vented Class C, SHK1-FB-E-HB non-vented Class E), at 567 g against 545 g for the Fidlock full brim, and those two versions are listed to ANSI/ISEA Z89.1 only.
What does ANSI and CSA dual certified mean?The dual-cert full brims (SHK1-FB-C-NA and SHK1-FB-E-NA) are listed by Studson to both ANSI/ISEA Z89.1-2014 (R2019) Type II and CSA Z94.1-2015 Type II, the Canadian industrial head protection standard, so one helmet can be issued on a job that crosses the border. The other SHK-1 versions are ANSI only; Studson states plainly that they are not certified to CSA Z94.1. The dual-cert shell has a different interior, and Studson states that its replacement pad set is not the same as the ANSI-only pad set and that the two must not be swapped.
How much does the SHK-1 weigh?As Studson states it on each product page: standard brim 495 g; full brim 545 g (1.2 lb / 19.2 oz); HighBar full brim 567 g (1.25 lb / 20 oz); dual-cert full brim 560 g (19.8 oz). The spec sheets print 525 g for the full brim, so two Studson figures exist for the same helmet; our listings carry the product-page figure. For comparison, most cap-style HDPE hard hats weigh under a pound (454 g), and a Type II helmet weighs more because the side-impact liner adds material; the live weight guide linked below puts the figures side by side.
What size is the SHK-1, and does it come in XXL?The full brim is one size fits most, 53 to 63 cm (hat sizes about 6 5/8 to 7 7/8), with a rear dial and an extendable front brow pad; seven of the full-brim colors are also made in XXL, 60 to 65 cm. The standard brim is sold in L/XL (58 to 63 cm), which Studson calls its universal size, and M/L (53 to 59 cm), which Studson states is being run out and will not be restocked once sold. If you sit between sizes, Studson says to size up to L/XL.
How long is a Studson helmet good for?Studson states three figures: a 3-year manufacturer warranty against defects in workmanship and materials, a field-use lifespan of 3 to 5 years, and a shelf life of up to 10 years from the manufacture date. None of those survives an impact: like every Z89.1 manufacturer, Studson’s helmet is retired after a blow that compresses the liner, and because the Koroyd tubes crumple visibly, Studson says a daily look at the liner shows whether the helmet has taken a hit. The 2 2 2 rule guide linked below covers replacement in detail.
What are Koroyd, Twiceme and Fidlock?Three components Studson names on every SHK-1. Koroyd is the impact liner: a matrix of welded plastic tubes that, in Studson’s words, crumple instantly and consistently on impact to absorb force, in place of the EPS foam most Type II helmets use. Twiceme is an NFC chip embedded in the shell that stores emergency contacts and medical information on the chip itself; any NFC phone reads it with a tap, no app or signal needed, and the owner loads it through the Twiceme app. Fidlock is the magnetic chin-strap buckle, which closes itself when the halves meet and opens with a sideways slide of two fingers, gloved or not.
What is Ionic+, and how do you clean the pads?Ionic+ is the silver-based antimicrobial fabric in the SHK-1 pad set; Studson states the silver is embedded in the fiber rather than coated on, so it does not wash out, and that the fabric is EPA registered and OEKO-TEX Standard 100 certified. The pads attach with hook-and-loop tabs and pull out. Studson’s care instruction is hand wash cold and air dry; no machine wash, no tumble dry. The replacement pad set is five pieces (three center pads, a brow pad and a rear pad, with new tabs); the dual-cert helmet takes its own pad set.
Are Studson hard hats any good, and who sells them?What we can say is what Studson publishes: the type and class on each version, the EN 12492 clauses on the ANSI-only versions, the CSA listing on the dual-cert versions, the weights and sizes above, and the 3-year warranty. Whether any helmet suits a job is the employer’s hazard assessment to make, which is why nothing on this site calls one helmet better than another. We stock the full SHK-1 line and its accessories in Pittsburg, California, ship to every state, and the Studson brand page lists every item with its part number; Studson itself sells through its own site and a dealer network.
What accessories fit the SHK-1?Studson’s rule is that the safety glasses and the ED-3B ear defender fit every SHK-1, while face shields, brackets, the half shield, the sun brims, the sun shield and the ED-2B ear defender are made for one shell: the cap-style helmet takes the SHK-1 face shield, half shield and ED-2B; the full brim takes the Paulson-made full brim shields and bracket, the nylon 7-slot bracket, the mesh shield and the FR sun brim. Chin straps, headlamps, the fleece liner, the neck shade, the cooling towel and the reflective sticker kit fit both. The accessories guide linked below lists every part by helmet.

The SHK-1 in plain words

  • Every SHK-1 is listed by Studson as Z89.1-2014 Type I and Type II; vented shells are Class C, non-vented shells are Class E.
  • Full brim or standard brim decides which face shields, brackets and sun brims fit; glasses, the ED-3B and the chin straps fit both.
  • Fidlock is the magnetic buckle; HighBar is the dial-adjustable chin strap sold on two full-brim versions.
  • Dual-cert full brims are listed to ANSI Z89.1 Type II and CSA Z94.1 Type II; every other SHK-1 is ANSI only.
  • Weights as Studson states them: 495 g standard brim, 545 g full brim, 560 g dual cert, 567 g HighBar.
  • Studson states a 3-year warranty, 3 to 5 years of field use and up to 10 years of shelf life; any impact retires the helmet.
  • Koroyd is the crumpling tube liner, Twiceme the NFC emergency chip, Ionic+ the silver antimicrobial pads (hand wash cold, air dry).
Studson SHK-1 product pages and spec sheets, fetched Nov 10 2026.

Questions people ask

Does Studson make a full brim hard hat?

Yes: the SHK-1 Full Brim, vented (Class C) or non-vented (Class E), plus carbon-finish, HighBar and ANSI plus CSA dual-certified versions. The standard brim is the cap-style shell.

Is the Studson SHK-1 Type 2?

Studson lists every SHK-1 as ANSI/ISEA Z89.1-2014 (R2019) Type I and Type II; Type II means it is tested for top and side impacts.

Is the SHK-1 Class E?

The non-vented versions are Class E (20,000 volt proof test, as Studson states it). The vented versions are Class C with no electrical rating, because vents open a path through the shell.

How much does the Studson SHK-1 helmet weigh?

Studson states 495 g for the standard brim, 545 g for the full brim, 560 g for the dual-cert full brim and 567 g for the HighBar full brim.

How long are Studson hard hats good for?

Studson states a 3-year warranty, a 3 to 5 year field-use lifespan and up to 10 years of shelf life from the manufacture date; a helmet that has taken an impact is retired regardless.

What is the HighBar on a Studson helmet?

A dial-adjustable chin strap: two arms above the jaw tightened by a grip-ring dial, with a padded chin cup, instead of fabric straps and a buckle. Sold on the full brim only.

What does dual certified mean on the SHK-1?

Listed to both ANSI/ISEA Z89.1-2014 Type II and CSA Z94.1-2015 Type II, so it can be issued in the United States and Canada. The other versions are ANSI only.

How to clean the padding in a Studson hard hat?

Pull the hook-and-loop pads out, hand wash cold, air dry; Studson says no machine washing or tumble drying. A worn set is replaced with the five-piece Ionic+ pad set for that helmet.

What is the chip in a Studson helmet?

A Twiceme NFC chip that stores emergency contacts and medical information on the chip; any NFC phone reads it with a tap, and the owner loads it through the Twiceme app.

What is Koroyd?

The impact liner in the SHK-1: welded plastic tubes that crumple on impact to absorb force, used in place of EPS foam. Because it crumples visibly, a daily look shows whether the helmet has been hit.

Who sells Studson hard hats?

Studson sells through its own site and dealers; we stock the full SHK-1 line and its accessories and ship to every state, with each part number on its own page.

Does the SHK-1 fit over a winter liner?

Studson sells a fleece liner made for the SHK-1 (97 percent polyester, 3 percent elastane); the rear dial gives the room, and the chin strap is re-adjusted over it.

Related guides

What accessories fit a hard hat, and is a chin strap required?Slots, rails, brackets and straps by helmetWhat is the 2 2 2 rule for helmets?The 5-year rule, the 10-year helmet and what Z89.1 and OSHA sayHow much does a hard hat weigh?And how to make one sit lowerType I vs Type II hard hatsWhat the types meanClass G, Class E and Class C hard hatsThe electrical ratingsVented hard hatsWhat the ventilation does to the electrical classEN 397 vs EN 12492 vs ANSI Z89.1What each helmet standard testsSafety helmet vs hard hatWhat the chin strap and Type II change

The ratings, test results and standards shown here are the manufacturers' published values, reproduced as published. Nothing on this page is a recommendation by Bayshore Safety that any product is suitable for a particular task, hazard or workplace. Selecting safety products and protective equipment is the responsibility of the end user and the employer, based on their own hazard assessment and the regulations that apply to their work. Confirm every value on the manufacturer's own documentation before use.

Need hard hats or safety helmets for a crew?Call (925) 215-7337 or email us the trades and headcount and we will quote by the case with the Z89.1 type and class each manufacturer publishes. Contractor Direct orders ship free.
Hard hat selector
!
How to buyCard, purchase order or invoice terms; quotes on request; agencies and institutions welcome.
Live Service & SupportReal people who know the products, Monday to Friday 7:30am to 4pm Pacific. 925-215-7337
We DeliverWe ship nationwide. Parcel and LTL freight to job sites and businesses across the U.S.