Hasps and Bolts

A hasp or bolt is the simple security hardware that locks down a shed door, a gate, a chest, or a cabinet — usually with a padlock through it. The choice comes down to three things: the type that matches how your door or gate moves, the size that fits the gap, and the finish that survives where it lives. That last one matters most in Montana. Outdoor hardware on a gate or outbuilding takes weather and freeze-thaw abuse, and the finish is what decides whether it lasts a decade or rusts solid in two winters.

For broader project planning, explore WBC’s doors and millwork resources.

National Hardware is the line stocked here, and it covers hasps designed to fasten doors, gates, and cabinets in multiple finishes, all built to lock with a padlock. The bolt side runs from lightweight cabinet barrel bolts up to heavy-duty gate latches.

Hasp types and how they differ

This is where most buyers get tangled up. The styles aren’t interchangeable — each one solves a different problem.

Safety hasp is the rigid, non-swivel workhorse. It includes a rigid non-swivel staple, and for security, all screws are concealed when the hasp is closed. That concealed-screw design is the whole point — nobody backs the screws out while it’s locked. Built for interior or exterior use, easy installation, and manufactured from hot rolled steel for durability, it secures doors, cabinets, boxes, and trunks.

Swivel safety hasp does the same job but the staple swivels, which helps on lids and applications where a fixed staple won’t line up.

Hinge hasp is the one for tricky corners. National Hardware’s hinge hasp is designed for regular or around-the-corner applications, and it’s pad lockable, for interior and exterior applications, with three offset screw holes for added strength, manufactured from hot rolled steel. Those three offset holes are what give it the bite on a door that wraps a corner.

Double hinge hasp adds a second pivot for doors that need more flex in the swing.

Draw hasp clamps down with tension — good for chests and lids where you want it pulled tight.

Sizes span a wide range across the line: 1-3/4”, 2-1/2”, 3-1/4”, 4-1/2”, 6”, 7”, and 7-1/4”. Match the length to the gap and the padlock you’re running. A 3-1/4” handles most cabinet and gate jobs; the 6” and 7” sizes are for heavier doors and outbuildings.

Hasp type	Best for	Key feature
Safety (non-swivel)	Doors, cabinets, boxes, trunks	Conceals all screws when closed
Swivel safety	Lids, misaligned staples	Swiveling staple
Hinge	Around-the-corner doors	Three offset screw holes
Double hinge	Doors needing extra flex	Two pivot points
Draw	Chests, tight-clamping lids	Tension closure

Bolt types: barrel, slide, and window

Bolts cover the lighter latching and security jobs. The barrel bolt is the most common.

National Hardware’s barrel bolt is designed for security applications on lightweight doors, chests, and cabinets, with a steel case, strike, and bolt for durability. The handy part: it works on vertical, horizontal, left or right hand applications — one bolt, any orientation. The 2-1/2” version runs a bolt diameter of .32 inches.

Barrel bolts come in 2-1/2”, 3”, 4”, 5”, and a 6” heavy-duty for gates and heavier doors. The stocked finishes here include black, brass, and zinc, with heavy-duty zinc versions in 4” and 6” for the jobs that need more steel.

Window bolts secure windows, cabinets, chests, and doors — lighter-duty than a barrel bolt, with a slim profile.

Slide bolt latches handle gate and door latching where you want a quick throw rather than a screw-down barrel.

Bolt type	Use	Stocked sizes/finishes
Barrel bolt	Lightweight doors, chests, cabinets	2-1/2”–6”; black, brass, zinc; H/D zinc in 4” & 6”
Window bolt	Windows, cabinets, chests, doors	2” white
Slide bolt latch	Gates, doors	Black
Surface bolt	Doors	3” solid brass

Finish is the durability decision

Here’s the part that separates hardware that lasts from hardware that streaks rust down your siding. Finishes run black, brass, galvanized, plain steel, zinc-plated, and stainless steel. For anything outdoors, the finish is not a cosmetic choice.

The standout is WeatherGuard coating. National Hardware’s WeatherGuard protection is proven to be 3x more resistant to corrosion versus competitors, formulated to withstand the harshest weather conditions and stand up to the corrosive effects of pressure treated lumber, with extensive testing and field use proving it far superior in corrosion resistance over competitive standard zinc-plated products.

That pressure-treated-lumber note is the one to circle. PT lumber chemistry eats ordinary fasteners and hardware from the inside. If you’re mounting a hasp to a treated gate post or a treated shed frame, a finish built to resist that chemistry is the difference between a five-minute job and a redo in two seasons.

For premium woods, go up a grade. Stainless steel safety hasps are the call for cedar and redwood — the woods where standard finishes corrode faster and bleed stains into a finish you paid good money for. Galvanized is the middle ground for general outdoor work.

A simple rule for the gate-and-outbuilding crowd: indoor cabinets and chests take black, brass, or zinc; exposed exterior gates and PT framing want WeatherGuard zinc or galvanized; cedar and redwood get stainless.

Materials and installation

Construction is straightforward steel for most of the line. Hasps are manufactured from hot rolled steel for durability, and barrel bolts use a steel case, strike, and bolt. Stainless steel and steel-wire constructions show up on specific items where the application calls for it.

Installation is about as simple as hardware gets. The barrel bolt and hinge hasp both list easy installation, and most pieces come with the mounting hardware in the pack. The security upgrade across the line is padlocking — the hinge hasp is pad lockable for added security, and the safety hasps are built to lock the same way with the screws hidden once closed.

Frequently Asked Questions

What’s the difference between a safety hasp and a hinge hasp? A safety hasp uses a rigid, non-swivel staple and conceals all its screws when closed, so they can’t be backed out while it’s locked. A hinge hasp is built for regular or around-the-corner applications and has three offset screw holes for added strength, making it the better pick when a door wraps a corner.

Which finish holds up best outdoors in wet, freeze-thaw conditions? For general exterior work, look to WeatherGuard zinc or galvanized. WeatherGuard coating is proven 3x more corrosion-resistant than standard zinc-plated hardware and is formulated to handle harsh weather. For cedar or redwood, step up to stainless steel safety hasps.

Will a standard hasp survive contact with pressure-treated lumber? The chemistry in pressure-treated lumber corrodes ordinary hardware. WeatherGuard protection is specifically formulated to stand up to the corrosive effects of pressure-treated lumber, which is why it’s the smart choice for treated gate posts and shed framing.

What size barrel bolt do I need? Barrel bolts come in 2-1/2”, 3”, 4”, 5”, and 6” heavy-duty. Lighter doors, chests, and cabinets do fine with 2-1/2” to 4”; gates and heavier doors call for the 5” or 6” heavy-duty. A barrel bolt works in vertical, horizontal, and left- or right-hand orientations.

Can these be locked with a padlock? Yes. Hasps and many bolts in the line are pad-lockable. Safety hasps are designed so all screws hide when closed, and the hinge hasp is pad-lockable for added security.