Top lock distorted thread locknuts class 8.
Top lock nut markings.
Center lock flange type din 6927.
Both markings will be acceptable for a transition period.
These metric locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon insert locknuts.
Full hex nut type din 934.
The crowned top is crimped to create a prevailing torque feature that increases the nut s resistance to loosening.
These graded identification markings show the latest revision.
All metal lock nuts the most common design is a nut with a crowned top looks like an upside down wheel nut.
All metal locknuts prevailing torque cone type iso 7042 7720 class 9 cone din 980v.
Cone flange type iso 7044.
Common names for all metal lock nuts are.
Jam center lock iso.
Nuts coated cadmium shall have a plus sign marked after the grade symbol.
The nuts bolts and washers used on the airplane are in accordance with air force navy specifications military specifications and national aircraft standards.
Bolt heads and nuts are often marked with numbers letters dashes slashes dots or an assortment of other marks.
Lock nuts typically fall into two categories.
A 4 9 0 x symbol for identification of grade i e a490 applied to head.
Manufacture s identification mark e g x applied to head raised or depressed at option of manufacturer.
Fasteners commonly have two different markings.
Top lock flange type din 6927.
The above chart should not be considered all inclusive for the fasteners listed the nuts listed are those that are readily available.
Cone asme b18 16 m.
Such markings differ based on how the fasteners were made.
Collar type din 934.
These metric locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon insert locknuts.
2 way reversible lock nuts flex type lock nuts stover lock nuts.
Medium strength steel top lock distorted thread locknuts grade 5.
All metal prevailing torque type lock nuts achieve their prevailing torque by altering the shape of the nut in some way most commonly by distorting the threads of the nut which then bites into the mating part when tightened.
Screws are marked on the top of their heads the exceptions being small under about 1 4 slotted and recessed head fasteners where there is insufficient room for head markings.
This section contains information on the correct usage and identification of bolts flat washers lock wash ers nuts lock nuts fittings and torque data.
Gr8 hex nut type.
