Description
There's a reason the Model 640 has stuck around as long as it has. This is the descendant of the original Model 40 Centennial, built on the same J-Frame that's been riding in pockets and on ankles since 1950, except this one is chambered for full-house .357 Magnum. The hammer is completely enclosed inside the frame, so there's nothing to catch on a jacket lining or holster edge when you need it out in a hurry. Double action only, every trigger pull, every time. Simple is the whole point here.
Why the Model 640 Earns Its Carry Spot
The frame, barrel, and cylinder are all stainless steel with a satin finish, and that matters more than it sounds. At 22.1 ounces, the 640 has enough heft to tame magnum recoil in a way the featherweight scandium and aluminum J-Frames simply can't. Plenty of folks carry it loaded with .357 and practice with .38 Special or +P, which it handles all day without complaint. The 2.12 inch barrel keeps the overall length to a tidy 6.6 inches, and the synthetic grip fills the hand nicely for a gun this size.
Sights, Trigger, and Everyday Details
Up top you get a black blade front sight pinned to the barrel and a fixed notch rear cut into the frame. Nothing to knock loose, nothing to adjust, just a clean sight picture that works at defensive distances. The smooth trigger face helps with a consistent double action pull, and the round butt profile keeps printing to a minimum under a shirt.
Who the S&W 640 Makes Sense For
This one suits anyone who wants a carry gun with zero buttons, levers, or slide to manage. Draw, pull the trigger, done. It works from a pocket, inside the waistband, or as a backup piece, and the stainless construction shrugs off sweat and weather better than blued steel ever will. If you've been eyeing a snub-nose magnum but worried about recoil, the all-steel 640 is the one that makes the caliber genuinely manageable.
Key Specifications
- Model: 640 (Centennial)
- Manufacturer Part Number: 163690
- UPC: 022188636901
- Caliber: .357 Magnum / .38 S&W Special +P
- Capacity: 5 Rounds
- Action: Double Action Only
- Barrel Length: 2.12"
- Overall Length: 6.6"
- Weight: 22.1 oz
- Frame: Stainless Steel, Small (J-Frame)
- Cylinder & Barrel Material: Stainless Steel
- Finish: Satin Stainless
- Grip: Black Synthetic
- Front Sight: Black Blade
- Rear Sight: Fixed Notch
- Hammer: Enclosed (Internal)
What’s Included
- Smith & Wesson Model 640 revolver
- Cable lock
- Owner's manual
Frequently Asked Questions
Can the Model 640 shoot .38 Special as well as .357 Magnum?
Yes. Like all .357 Magnum revolvers, the 640 will chamber and fire .38 Special and .38 Special +P, and it's rated for continuous +P use. A lot of owners practice with softer-shooting .38s and load .357 for carry, which is a smart way to keep range sessions comfortable while carrying full power.
How bad is the recoil with .357 Magnum in a gun this small?
Full magnum loads out of a snub are always going to get your attention, but the 640 handles them better than most. Its all-steel frame and cylinder bring the weight to 22.1 ounces, noticeably heavier than the alloy J-Frames, and that extra mass soaks up a real chunk of the recoil. It's stout but very manageable, especially with .38 Special.
Does the S&W 640 have an exposed hammer for single action shooting?
No, the hammer is fully enclosed inside the frame, so it's double action only. That's by design. The smooth top profile means nothing snags when drawing from a pocket or under clothing, and you can even fire it from inside a coat pocket without the hammer hanging up. Every pull is the same consistent double action stroke.
Is the Model 640 a good choice for concealed carry?
It's one of the classics for exactly that job. The snag-free profile, 2.12 inch barrel, and 6.6 inch overall length make it easy to hide in a pocket holster, IWB rig, or ankle setup. The stainless construction also holds up well against sweat and daily wear, which matters for a gun that lives close to the body.





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