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Self Locking Fasteners & Bolts

self locking bolts

Self locking fasteners, also known as self locking bolts,  were developed to uphold usability in the bolts, and also prevent the possibility of disassembly for the pre-load. Self sealing fasteners can eliminate a bolted assembly from unraveling with proper design and manufacturing from Aetna Screw.

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GM* Type "AA", Self Locking, Hex Head Place Bolts, 6 Slot Grade 8
Made to General Motors* 300 Specifications for Chemical Composition

Designed For Top Performance

The Aetna Six Slot GM* Type AA Hex Head Place Bolt GR.8 is especially well suited to flywheel, transmission and drive train applications where excessive vibration, high stress and shock cause failure of conventional hex head cap screws and bolts. The Aetna Six Slotted GM* Type AA Hex Head Place Bolt GR.8 are commonly used in the automotive, truck, farm implement, heavy equipment, and material handling industries.

The unique head design accounts for the superior performance of The Aetna 6 Slot GM* Type AA Hex Head Place Bolt GR.8. There are six slots on the top, a recessed center, and an undercut at the base of the head that meets the shoulder. This design creates an elasticity, so that when torqued down, the head distorts and maintains a pre-set clamp load under very adverse conditions. The heads are marked with our registered AETNA head mark.

Don't Be Fooled By Imitations

The Aetna 6 Slot GM* Type AA Hex Head Place Bolt GR.8 are manufactured in the USA from American made Grade 8 alloy steel. They meet General Motors* Type AA Hex Lock Bolt specifications for physical characteristics and properties as well as General Motors* GM* 300 specifications for chemical composition. Strict Statistical Process Control (SPC) procedures are observed throughout the manufacturing process. All of our place bolts have complete lot traceability. Certifications are available upon request.

Contact us with the size or General Motors* part number you need and we'll respond with a prompt quotation.

*Trademark of General Motors Corporations

Bolt
Dia.		E -DiameterFGHJK/KA
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
1/4 .2500 .2490 .4375 .4280 .505 .486 .135 .125 .317 .307 .007 .004
5/16 .3125 .3065 .5000 .4890 .577 .557 .198 .188 .396 .386 .013 .010
3/8 .3750 .3690 .5625 .5510 .650 .628 .260 .250 .474 .464 .013 .010
7/16 .4375 .4305 .6250 .6120 .722 .696 .291 .281 .536 .526 .013 .010
1/2 .5000 .4930 .7500 .7360 .860 .840 .327 .312 .630 .620 .013 .010
9/16 .5625 .5545 .8125 .7980 .936 .910 .390 .375 .693 .683 .013 .010
5/8 .6250 .6170 .8750 .8600 1.010 .980 .390 .375 .750 .740 .013 .010
3/4 .7500 .7410 1.0000 .9830 1.155 1.121 .458 .438 .875 .865 .013 .010
7/8 .8750 .8660 1.1250 1.1060 1.299 1.261 .520 .500 1.000 .990 .013 .010
1 1.0000 .9900 1.3125 1.2920 1.516 1.473 .582 .562 1.125 1.115 .013 .010

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Bolt
Dia.		MNRR1R2LT Ref.
Min. Max. Min. Max. Min. Max. Min. Max. ±.25 L<.67 L>.67
1/4 .166 .146 .110 .090 .024 .016 .031 .016 1.75 .750 1.000
5/16 .208 .188 .145 .125 .024 .016 .031 .016 1.75 .875 1.125
3/8 .250 .230 .185 .165 .031 .016 .031 .016 1.75 1.000 1.250
7/16 .288 .268 .205 1.85 .031 .016 .031 .016 1.75 1.125 1.375
1/2 .332 .312 .220 .200 .031 .016 .031 .016 1.75 1.250 1.500
9/16 .374 .354 .260 .240 .031 .016 .031 .016 1.75 1.375 1.625
5/8 .416 .396 .290 .270 .047 .016 .031 .016 3.25 1.500 1.750
3/4 .500 .480 .335 .315 .047 .016 .031 .016 3.63 1.750 2.000
7/8 .584 .564 .390 .370 .047 .031 .062 .031 4.37 2.000 2.250
1 .666 .646 .455 .435 .062 .031 .062 .031 6.63 2.250 2.500
L/Ls Bolt Length 
Over 6" -18 -18 -18 -20
4" - 6" -10 -10 -10 -16
2-1/2" - 4" -06 -08 -10 -14
1" - 2-1/2" -04 -06 -08 -10
Thru 1" -03 -03 -03 -
Tolerance 1/2-3/8 7/16-1/2 9/16-3/4 7/8-1

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