Hyde Tools 42045 Auto-Lock Snap-Off Knife, 9mm
Utility And Snap Off Knives — Primary Tool
№42045

Hyde Tools 42045 Auto-Lock 9mm Snap-Off Blade Utility Knife

MODEL 42045 · SKU H-42045 · UPC 079423420450
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$5.39 PER UNIT · SINGLE UNIT UNIT PRICE

Selected subtotal: $5.39. Standard US shipping is $9.99 below $15, $7.99 from $15 to below $49, and free at $49 after discounts. Freight items excluded; other rates are shown at checkout.

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Auto-Lock 9mm Snap-Off Blade Utility Knife

Official Hyde specifications

Dimensions
9 mm
Product type
Blade
PRODUCT FIT · IS THIS THE RIGHT TOOL? Straight answers. If it's the wrong tool for your job, we'll say so.

The guidance below describes applications and limitations. For a match to your particular job or an existing tool, ask us to confirm fit.

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Is this the right tool for your job?

✕CHOOSE A DIFFERENT TOOL WHEN
  • Stiff-blade work — drywall, rigid foam, hand-pressure scoring — where the 9mm flexes and the 18mm (42047) holds the line.
  • Leveraged and abusive cutting, which cracks a snap segment and belongs to the trapezoid knives (42020/42083).
  • Occasional light use where the working-build upgrade is money unspent — the economy 42036 is the honest match for a DIY drawer or a weekend hang.
  • And it is not a policy carton knife (Switchblades 42060/42065) or a brittle-sheet scorer (45730), both of which sit outside the snap-off class entirely.

Jobs this tool does

EXACT JOB METHODS FOR HYDE №42045
Job guide Cut Vinyl Graphics and FilmsOPEN JOB GUIDE

For these jobs—use this instead

THE JOB, THE REASON, AND THE BETTER TOOL
Stiff-blade work Drywall, rigid foam, hand-pressure scoring — where the 9mm flexes and the 18mm (42047) holds the line. BETTER TOOL Snap-Off Knife, 18mm 42047 Leveraged abusive cutting Leveraged and abusive cutting, which cracks a snap segment and belongs to the trapezoid knives (42020/42083). BETTER TOOL Front-Loading Top Slide Knife 42020 Occasional light DIY use The economy 42036 is the honest match for a DIY drawer or a weekend hang. BETTER TOOL Snap-Off Knife, 9mm (economy) 42036 Policy carton work and brittle scoring And it is not a policy carton knife (Switchblades 42060/42065) or a brittle-sheet scorer (45730), both of which sit outside the snap-off class entirely. BETTER TOOL Plastic Cutter 45730

How the pros run it

01

Trust the auto-lock, but respect its logic

It clamps wherever the slide stops, which is fast and set-and-forget — the trade-off against a 2-piece positive lock is that a positive lock is a deliberate two-step for a blade you want absolutely fixed; for constant-change precision work, the auto-lock is the right pattern, but know the difference when a cut is deep and side-loaded. Keep the blade short. Precision is a short-cantilever property regardless of build — a segment or two out of the nose; run it far and even this body cannot stop the slim blade flexing. Snap on a schedule. Every few cuts in wallpaper and film, before the drag, not after — the working build gives you three blades of runway, so there is no excuse to ride a dull point. Mind the stainless track. It is the wear surface you paid for; keep grit out of the slide so it stays crisp, and the auto-lock keeps its bite. Contain your segments. A snapped 9mm point is the sharpest small waste on any job — cap-and-snap into a sharps tin, never loose.

Asked before buying

BUYER QUESTIONS, ANSWERED BEFORE YOU ORDER
Why is this store showing the knife twice?
A listing quirk: h-42045 and 79423420450 are the same product, the second handle being its UPC with the leading zero dropped. They should be merged; there is no difference between them to choose.
What exactly am I paying up for over the 42036?
Three things: an auto-lock slide (one-motion set-and-hold), a stainless steel blade track (the wear surface that keeps the slide from loosening under heavy use), and three blades in the handle instead of one.
Is the auto-lock as secure as a positive lock?
For continuous precision work with constant extension changes it is the better pattern — fast and set-and-forget. A 2-piece positive lock is the more deliberate hold for a deep, side-loaded blade; that pattern is on the 42036/42047, not here.
Is the whole knife stainless?
No — the body is high-impact polystyrene; the stainless steel is the blade track. The blade is standard carbon snap-off steel.
How short should I keep the blade?
A segment or two — the 9mm is precise only at short extension, whatever the body.

Compare Hyde models

Crew & facility ordering

Model & SKUModel 42045 · SKU H-42045 · UPC 079423420450
Product-specific quantity pricingSee this product’s published tiers above. Eligible discounts apply automatically at checkout.
PO & NET-30Approved contractors, facilities, schools and government buyers can route through Hyde Pro.
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Reviews

Specs & documentation

Full specification details
catalog product name
Auto-Lock 9mm Snap-Off Blade Utility Knife
official family claim
13 points per blade.
official family claim
High-impact polystyrene with stainless steel blade track.
official family claim
3 blades included.
official product name
9mm Snap-Off Utility Knife (Auto-Locking)
official variant identity
42045
official package image fact
Product type: BLADE.
official package image fact
Package-observed dimensions or capacities: 9MM.
official package image fact
Exact model 42045 appears in the official package image text.
corroborated construction material
Retailer/distributor listing independently repeats: stainless steel.
Hyde official catalog evidence ↗Hyde Tools manufacturer source ↗Hyde official catalog evidence ↗
$5.39PER UNIT · H-42045