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ARP

Back the early 1970s, racing enthusiast Gary Holzapfel saw that many of his friends’ broken engines were caused by fastener failure. At the time, there were no commercially available studs and bolts up to the challenge. So Holzapfel called upon his many years of fastener making experience for a leading aerospace subcontractor and founded ARP (Automotive Racing Products). ARP’s product line contains thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline and throughout the suspension and frame. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, NASCAR and NHRA drag racing and marine applications.

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Hex Nut Kit w/Flange 5/16-24 (10pk)

ARP
$16.99 - $16.99
$16.99
$20.99
$20.99 - $20.99
$20.99
21 in stock

Nut - Locking - 5/16-24 in Thread - 3/8 in Hex Head - Serrated Flange - Chromoly - Black Oxide - Set of 10

$16.99 - $16.99
$16.99
$20.99
$20.99 - $20.99
$20.99

1/4 ID x .550 OD Black Washers No-Chamfer 10pk

ARP
$2.99 - $2.99
$2.99
$2.99
$2.99 - $2.99
$2.99
11 in stock

Flat Washer - Special Purpose - 0.25 in ID - 0.55 in OD - 0.075 in Thick - Chromoly - Black Oxide - Set of 10

$2.99 - $2.99
$2.99
$2.99
$2.99 - $2.99
$2.99

1/4 ID .550 OD Washers 10pk - Black

ARP
$2.99 - $2.99
$2.99
$3.99
$3.99 - $3.99
$3.99
15 in stock

Flat Washer - Special Purpose - Chamfered - 0.25 in ID - 0.55 in OD - 0.075 in Thick - Chromoly - Black Oxide - Set of 10

$2.99 - $2.99
$2.99
$3.99
$3.99 - $3.99
$3.99

Hex Serrated Flange Nuts 5/16-24 (10)

ARP
$6.99 - $6.99
$6.99
$6.99
$6.99 - $6.99
$6.99
Only 1 left!

Nut - Locking - 5/16-24 in Thread - 1/2 in Hex Head - Serrated Flange - Steel - Cadmium - Set of 10

$6.99 - $6.99
$6.99
$6.99
$6.99 - $6.99
$6.99
Sold out

Hex Nuts - 3/8-24 (10)

ARP
$6.99 - $6.99
$6.99
$6.99
$6.99 - $6.99
$6.99
Out of stock

Nut - Locking - 3/8-24 in Thread - 9/16 in Hex Head - Serrated Flange - Steel - Cadmium - Set of 10

$6.99 - $6.99
$6.99
$6.99
$6.99 - $6.99
$6.99
Sold out

Black Washers - 8mm ID x .575 OD (10)

ARP
$8.99 - $8.99
$8.99
$9.99
$9.99 - $9.99
$9.99
12 in stock

Flat Washer - Special Purpose - 8 mm ID - 0.575 in OD - 0.06 in Thick - Chromoly - Black Oxide - Set of 10

$8.99 - $8.99
$8.99
$9.99
$9.99 - $9.99
$9.99

Hex Nuts - 1/4-28 (10)

ARP
$6.99 - $6.99
$6.99
$10.99
$10.99 - $10.99
$10.99
6 in stock

Nut - Locking - 1/4-28 in Thread - 7/16 in Hex Head - Serrated Flange - Steel - Cadmium - Set of 10

$6.99 - $6.99
$6.99
$10.99
$10.99 - $10.99
$10.99
Save 6% Save %

Hex Nuts - 1/2-20 (10)

ARP
$17.99
$17.99 - $17.99
$17.99
$16.99
$16.99 - $16.99
$16.99
12 in stock

Nut - 1/2-20 in Thread - 3/4 in Hex Head - Chromoly - Black Oxide - Set of 10

$17.99
$17.99 - $17.99
$17.99
$16.99
$16.99 - $16.99
$16.99
Save 6% Save %

Hex Nuts - 7/16-20 (10)

ARP
$19.99 - $19.99
$19.99
$25.99
$25.99 - $25.99
$25.99
37 in stock

Nut - 7/16-20 in Thread - 11/16 in Hex Head - Chromoly - Black Oxide - Set of 10

$19.99 - $19.99
$19.99
$25.99
$25.99 - $25.99
$25.99
Save 5% Save %

Hex Nuts - 7/16-20 (10)

ARP
$19.99
$19.99 - $19.99
$19.99
$18.99
$18.99 - $18.99
$18.99
20 in stock

Nut - 7/16-20 in Thread - 5/8 in Hex Head - Chromoly - Black Oxide - Set of 10

$19.99
$19.99 - $19.99
$19.99
$18.99
$18.99 - $18.99
$18.99
Save 5% Save %

Hex Nuts - 3/8-24 (10)

ARP
$6.99 - $6.99
$6.99
$6.99
$6.99 - $6.99
$6.99
43 in stock

Nut - 3/8-24 in Thread - 9/16 in Hex Head - Chromoly - Black Oxide - Set of 10

$6.99 - $6.99
$6.99
$6.99
$6.99 - $6.99
$6.99
Save 9% Save %

5/16-24 Hex Nut Kit 10pk

ARP
$6.99
$6.99 - $6.99
$6.99
$6.36
$6.36 - $6.36
$6.36
15 in stock

ARP 5/16 - 24 Hex Nut Kit (10 Pkg) Black Oxide

$6.99
$6.99 - $6.99
$6.99
$6.36
$6.36 - $6.36
$6.36
Save 9% Save %

1/4-28 Hex Nut w/Flange Kit (10pk)

ARP
$15.99 - $15.99
$15.99
$20.99
$20.99 - $20.99
$20.99
19 in stock

Nut - 1/4-28 in Thread - 7/16 in Hex Head - Chromoly - Black Oxide - Set of 10

$15.99 - $15.99
$15.99
$20.99
$20.99 - $20.99
$20.99

Hex Nuts - 5/16-24 (10)

ARP
$6.99 - $6.99
$6.99
$7.20
$7.20 - $7.20
$7.20
Only 5 left!

ARP 5/16in-24 Hex Nut Kit (10 Pack)

$6.99 - $6.99
$6.99
$7.20
$7.20 - $7.20
$7.20

Black Washers - 3/8ID x .625 OD Chamfer (10)

ARP
$8.99 - $8.99
$8.99
$11.99
$11.99 - $11.99
$11.99
33 in stock

Flat Washer - Chamfered - 0.375 in ID - 0.625 in OD - 0.12 in Thick - Chromoly - Black Oxide - Set of 10

$8.99 - $8.99
$8.99
$11.99
$11.99 - $11.99
$11.99

Hex Nut - 1/2-20 (1)

ARP
$2.99 - $2.99
$2.99
$2.99
$2.99 - $2.99
$2.99
77 in stock

Nut - 1/2-20 in Thread - 3/4 in Hex Head - Chromoly - Black Oxide - Each

$2.99 - $2.99
$2.99
$2.99
$2.99 - $2.99
$2.99

Hex Nut - 7/16-20 (1)

ARP
$2.99 - $2.99
$2.99
$2.99
$2.99 - $2.99
$2.99
Only 1 left!

Nut - 7/16-20 in Thread - 11/16 in Hex Head - Chromoly - Black Oxide - Each

$2.99 - $2.99
$2.99
$2.99
$2.99 - $2.99
$2.99

Hex Nut - 7/16-20 (1)

ARP
$2.99 - $2.99
$2.99
$3.99
$3.99 - $3.99
$3.99
76 in stock

Nut - 7/16-20 in Thread - 5/8 in Hex Head - Chromoly - Black Oxide - Each

$2.99 - $2.99
$2.99
$3.99
$3.99 - $3.99
$3.99

Hex Nut - 3/8-24 (1)

ARP
$1.99 - $1.99
$1.99
$1.99
$1.99 - $1.99
$1.99
100 in stock

Nut - 3/8-24 in Thread - 9/16 in Hex Head - Chromoly - Black Oxide - Each

$1.99 - $1.99
$1.99
$1.99
$1.99 - $1.99
$1.99

Hex Nut - 5/16-24 (1)

ARP
$1.99 - $1.99
$1.99
$1.99
$1.99 - $1.99
$1.99
Only 3 left!

Nut - 5/16-24 in Thread - 1/2 in Hex Head - Chromoly - Black Oxide - Each

$1.99 - $1.99
$1.99
$1.99
$1.99 - $1.99
$1.99

Insert Washers - 7/16 ID x .875 OD (10)

ARP
$49.99 - $49.99
$49.99
$51.30
$51.30 - $51.30
$51.30
Only 4 left!

ARP .875in OD x 7/16in ID Insert Washers (10 pack)

$49.99 - $49.99
$49.99
$51.30
$51.30 - $51.30
$51.30
Save 25% Save %

Black Washer - 5/16 ID x .550 OD (1)

ARP
$1.99
$1.99 - $1.99
$1.99
$1.49
$1.49 - $1.49
$1.49
Only 1 left!

Flat Washer - Special Purpose - 0.313 in ID - 0.55 in OD - 0.12 in Thick - Chromoly - Black Oxide - Each

$1.99
$1.99 - $1.99
$1.99
$1.49
$1.49 - $1.49
$1.49
Save 25% Save %

Black Washers - 10mm ID x .850 OD (10)

ARP
$10.99 - $10.99
$10.99
$16.99
$16.99 - $16.99
$16.99
8 in stock

Flat Washer - Special Purpose - 10 mm ID - 0.85 in OD - 0.115 in Thick - Chromoly - Black Oxide - Set of 10

$10.99 - $10.99
$10.99
$16.99
$16.99 - $16.99
$16.99

Black Washers - 5/16 ID x 13/16 OD (10)

ARP
$16.99 - $16.99
$16.99
$16.99
$16.99 - $16.99
$16.99
Only 3 left!

Flat Washer - Special Purpose - Chamfered - 0.313 in ID - 0.813 in OD - 0.12 in Thick - Chromoly - Black Oxide - Set of 10

$16.99 - $16.99
$16.99
$16.99
$16.99 - $16.99
$16.99