The Ampco Safety Tools M-41 is a 7-piece SAE non-sparking, non-magnetic combination wrench set (3/8 in - 7/8 in) — nickel aluminum bronze, 15° offset box end — stored in a fabric tool roll for use in hazardous work environments.

Manufactured in the USA and Factory Mutual approved, it is beryllium-free and built for professionals who work around flammable or combustible vapors, liquids, dust, or residue where a standard steel tool could trigger a dangerous spark. Its non-magnetic properties make it safe for use near highly sensitive magnetic equipment, including MRI and clean room environments, and it conforms to ASTM F2503 and ASTM A342 standards.

Unlike conventional steel tools, the Ampco M-41 delivers outstanding durability even in the most corrosive conditions, including exposure to salt water, chemicals, and acids.

The M-41 combination wrench set is the go-to choice for oil and gas, petrochemical, mining, military, and industrial maintenance applications where worker safety and tool reliability are non-negotiable.

Specifications

Number of pieces: 7

Size range: 3/8 in - 7/8 in

Included sizes: W-601 (3/8"), W-611 (7/16"), W-621 (1/2"), W-631 (9/16"), W-641 (5/8"), W-661 (3/4"), W-671 (7/8")

Storage: Fabric tool roll

FM Approved: Yes

Availability: Typically in stock. If your item is unavailable at the time of order, we will contact you promptly to confirm lead times and discuss alternatives.

HS Code: 8204.11

COO: USA

FAQ

What sizes are included in the M-41 set?

The set includes 7 SAE combination wrenches: 3/8", 7/16", 1/2", 9/16", 5/8", 3/4", and 7/8" — covering the most common fastener sizes in industrial and oil field maintenance.

What alloy are the wrenches made from?

All wrenches are machined from Ampco's nickel aluminum bronze alloy — non-sparking, non-magnetic, Factory Mutual approved, and beryllium-free.

How is the set stored?

The 7 wrenches are stored in a fabric tool roll for organized, portable storage.

Is the M-41 set Factory Mutual approved?

Yes. All wrenches conform to ASTM F2503 and ASTM A342.

Is the Ampco M-41 covered by a warranty?

Yes. All Ampco Safety Tools carry a lifetime warranty.