What is the intended use of the IS 5486 knife?

For emergency use by parachutists to cut suspension lines or harness in case of entanglement (Clause 1.1).

What is the specified material for the blade?

High carbon steel conforming to IS 1570 or stainless steel conforming to Grade 04Cr13 of IS 6603 (Clause 3.1).

What is the required hardness for the carbon steel blade?

The blade must have a hardness of 54 to 58 HRC (Clause 3.1.2).

What are the approved materials for the handle?

Seasoned wood, such as rosewood or walnut, or a suitable plastic material that is free from defects (Clause 3.2).

IS 5486

: 1985

Specification for quick-release knife

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard specifies the requirements for a quick-release knife intended for emergency use by personnel engaged in parachuting. It covers the material, dimensions, construction, performance, and testing of the knife, which is designed to quickly cut harness or suspension lines in an emergency.

Specification for quick-release knife

Quick Reference Values

Overall length (closed)130 ± 5 mm

Blade length80 ± 5 mm

Blade hardness (Carbon Steel)54 to 58 HRC

Blade hardness (Stainless Steel)48 to 52 HRC

Handle materialSeasoned wood (Rosewood, Walnut) or suitable plastic

Blade materialHigh carbon steel or stainless steel

Practical Notes

The primary function is emergency cutting of parachute lines; it is not designed as a general utility knife.

The 'quick-release' refers to the rapid, one-handed blade deployment mechanism, which is critical for its function.

Regular inspection of the blade's sharpness and the functionality of the release mechanism is crucial for user safety.