A-K Logo A-K Insert

The A-K Series™ is identical to the A-L Series™ but features a low profile head for applications requiring near flush mating part assembly.

A-K Series™ Knurled Threaded Insert

The A-K Series™ Knurled Threaded Insert features a knurled body and a reduced profile head to allow for virtually flush installation. Countersink drilling or dimpling of the parent material can be eliminated. The A-K Insert is designed to be used with Grade 5 or Metric Class 8.8/9.8 mating screws.

The A-K Insert can be installed using AVK’s ARO brand Pneumatic Tools or AVK’s SPP™ Pneumatic/Hydraulic Tools. These tools can be located at any position on your assembly line. The A-K Insert can be installed either before or after finish.

The A-K Series™ Insert - Design Benefits

VIRTUALLY FLUSH INSTALLATIONS are achieved without special hole preparation due to the A-K Series™ minimal head profile.
EXCEPTIONAL TORQUE STRENGTH is achieved as the insert’s knurled body expands FILLING THE HOLE.
QUALITY INSTALLATIONS even in variable thickness materials are assured by AVK’s spin/spin ARO Pneumatic Tools and our SPP™ Pneumatic/Hydraulic SPP2 Tool™.
SUPERIOR THREAD STRENGTH is provided due to our internal rolled thread manufacturing process.
THREADS GAUGE before and after installation due to the increased cross-sectional thickness of the thread area. Thread dilation is prevented.
INVENTORY REDUCTION is possible because of the A-K Series™ wide grip range capacity. It is 2.5 times greater than conventional rivet nuts.
SUPERIOR CORROSION RESISTANCE is provided by our standard zinc/yellow trivalent finish (120 hrs. salt spray to white corrosion). For exceptional corrosion protection we offer a trivalent tin/zinc alloy finish.
AVAILABLE in Steel. Additional materials such as aluminum, brass and monel are available by special order. Contact AVK for details.

The A-K Series™ Insert - Various Design Types

OPEN END CLOSED END

Thread area is enclosed
eliminating leakage past
the threads from either side
of the application.

The A-K Series™ Insert - Part Numbering System

AK (    ) (    ) - (    ) - (    ) (    )
Material
Finish
Type
Product
Series
Call
Out
Grade
S Steel 1010/1008
A Aluminum 5056
B Brass 270/260
M Monel 400
Call
Out
Specification
3T Zinc Trivalent per ASTM-B-633, FE/ZN .0003 (8μ) with Clear Protective Coating
4T Yellow Zinc Trivalent per ASTM-B-633, FE/ZN .0003 (8μ) with Clear Protective Coating
9T Tin Zinc Trivalent per ESP-P-004, 0003 (8μ) with Clear Protective Coating
Thread
Call Out
Grip
Call Out
Call
Out
Type
blank Open End
B Closed End
Sample Part Number:
AKS3T-420-165
* Special order items are subject to minimum order requirements. Contact AVK for details.

The A-K Series™ Insert - Thread Sizes


Thread
Size
Thread
Call
Out
Grip
Range
Grip
Call
Out
Hole Size
+.006
-.000
HD
±.015
HH
±.003
L
±.015
D
Max.
IL
Max.
LB
±.015
ILB
Max
IATD*
Max.
6-32 UNC 632 .020-.080 80 17/64 (.2656) .310 .019 .420 .265 .305 .740 .640 .610
6-32 UNC 632 .080-.130 130 17/64 (.2656) .310 .019 .470 .265 .305 .740 .580 .670
8-32 UNC 832 .020-.080 80 17/64 (.2656) .310 .019 .420 .265 .305 .740 .640 .610
8-32 UNC 832 .080-.130 130 17/64 (.2656) .310 .019 .470 .265 .305 .740 .580 .670
10-24 UNC 1024 .020-.130 130 19/64 (.2969) .340 .019 .475 .296 .315 .990 .845 .730
10-24 UNC 1024 .130-.225 225 19/64 (.2969) .340 .019 .585 .296 .315 .990 .735 .840
10-32 UNF 1032 .020-.130 130 19/64 (.2969) .340 .019 .475 .296 .315 .990 .845 .730
10-32 UNF 1032 .130-.225 225 19/64 (.2969) .340 .019 .585 .296 .315 .990 .735 .840
1/4-20 UNC 420 .027-.165 165 25/64 (.3906) .455 .022 .580 .390 .380 1.190 1.005 .895
1/4-20 UNC 420 .165-.260 260 25/64 (.3906) .455 .022 .680 .390 .380 1.190 .905 1.035
5/16-18 UNC 518 .027-.150 150 17/32 (.5312) .595 .022 .690 .530 .470 1.390 1.175 .995
5/16-18 UNC 518 .150-.312 312 17/32 (.5312) .595 .022 .805 .530 .425 1.390 1.025 1.120
3/8-16 UNC 616 .027-.150 150 17/32 (.5312) .595 .022 .690 .530 .470 1.390 1.175 .995
3/8-16 UNC 616 .150-.312 312 17/32 (.5312) .595 .022 .805 .530 .425 1.390 1.025 1.120
 
Thread
Size
Thread
Call
Out
Grip
Range
Grip
Call
Out
Hole Size
+0,15
-0,00
HD
±0,38
HH
±0,08
L
±0,38
D
Max.
IL
Max.
LB
±0,38
ILB
Max
IATD*
Max.
M4 x 0,7 ISO 470 0,50-2,00 2.0 6,75 7,87 0,48 10,67 6,73 7,75 18,80 16,26 15,49
M4 x 0,7 ISO 470 2,00-3,30 3.3 6,75 7,87 0,48 11,94 6,73 7,75 18,80 14,73 17,02
M5 x 0,8 ISO 580 0,50-3,30 3.3 7,60 8,64 0,48 12,07 7,52 8,00 25,15 21,46 18,54
M5 x 0,8 ISO 580 3,30-5,70 5.7 7,60 8,64 0,48 14,86 7,52 8,00 25,15 18,67 21,34
M6 x 1,0 ISO 610 0,70-4,20 4.2 10,00 11,56 0,55 14,73 9,91 9,65 30,23 25,53 22,73
M6 x 1,0 ISO 610 4,20-6,60 6.6 10,00 11,56 0,55 17,27 9,91 9,65 30,23 22,99 26,29
M8 x 1,25 ISO 8125 0,70-3,80 3.8 13,50 15,11 0,55 17,53 13,46 11,94 35,31 29,85 25,27
M8 x 1,25 ISO 8125 3,80-7,90 7.9 13,50 15,11 0,55 20,45 13,46 10,80 35,31 26,04 28,45
M10 x 1,5 ISO 1015 0,70-3,80 3.8 13,50 15,11 0,55 17,53 13,46 11,94 35,31 29,85 25,27
M10 x 1,5 ISO 1015 3,80-7,90 7.9 13,50 15,11 0,55 20,45 13,46 10,80 35,31 26,04 28,45

NOTE 1: Grip range can be affected by parent material density and actual hole size.
AVK suggests trial installations to determine optimum grip.
NOTE 2: Additional UNF fine threads are available. Contact AVK for details.
NOTE 3: Additional grip lengths are available in certain thread sizes. Contact AVK for details.
*Dimensions in minimum grip condition.
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