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KK Hand Tools

Ko-Ken hand tools include professional-grade tools and accessories used for assembly, maintenance, and repair in automotive, industrial, and MRO environments (application dependent). Technicians and maintenance teams typically choose these tools for consistent fit on fasteners, durability under daily use, and better access in tight spaces. Because “hand tools” covers many categories, selecting the right item is mainly about matching the tool type and specifications to your fastener sizes, drive system, and working conditions (per listing).


Explore our full range of Ko-Ken hand tools, including:
Standard and deep sockets (metric and SAE)
Ratchets and breaker bars for high-torque applications
Extension bars for hard-to-reach fasteners
Specialty tools and adaptors for unique jobs

Ko-ken 3300FN-10 3/8 Sq. Dr. Socket 10mm Flare Nut Length 53mm

Ko-ken 3300FN-10 3/8 Sq. Dr. Socket 10mm Flare Nut Length 53mm

SKU: KK-3300FN-10
MPN: 3300FN-10

Save $11.01
Ko-ken 3300FN-11 3/8 Sq. Dr. Socket 11mm Flare Nut Length 53mm

Ko-ken 3300FN-11 3/8 Sq. Dr. Socket 11mm Flare Nut Length 53mm

SKU: KK-3300FN-11
MPN: 3300FN-11

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Ko-ken 3300FN-13 3/8 Sq. Dr. Socket 13mm Flare Nut Length 62mm

Ko-ken 3300FN-13 3/8 Sq. Dr. Socket 13mm Flare Nut Length 62mm

SKU: KK-3300FN-13
MPN: 3300FN-13

Save $11.33
Ko-ken 3300FN-14 3/8 Sq. Dr. Socket 14mm Flare Nut Length 62mm

Ko-ken 3300FN-14 3/8 Sq. Dr. Socket 14mm Flare Nut Length 62mm

SKU: KK-3300FN-14
MPN: 3300FN-14

Save $11.54
Ko-ken 3300FN-15 3/8 Sq. Dr. Socket 15mm Flare Nut Length 70mm

Ko-ken 3300FN-15 3/8 Sq. Dr. Socket 15mm Flare Nut Length 70mm

SKU: KK-3300FN-15
MPN: 3300FN-15

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Ko-ken 3300FN-16 3/8 Sq. Dr. Socket 16mm Flare Nut Length 70mm

Ko-ken 3300FN-16 3/8 Sq. Dr. Socket 16mm Flare Nut Length 70mm

SKU: KK-3300FN-16
MPN: 3300FN-16

Save $11.85
Ko-ken 3300FN-17 3/8 Sq. Dr. Socket 17mm Flare Nut Length 80mm

Ko-ken 3300FN-17 3/8 Sq. Dr. Socket 17mm Flare Nut Length 80mm

SKU: KK-3300FN-17
MPN: 3300FN-17

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Ko-ken 3300FN-18 3/8 Sq. Dr. Socket 18mm Flare Nut Length 80mm

Ko-ken 3300FN-18 3/8 Sq. Dr. Socket 18mm Flare Nut Length 80mm

SKU: KK-3300FN-18
MPN: 3300FN-18

Save $12.58
Ko-ken 3300FN-19 3/8 Sq. Dr. Socket 19mm Flare Nut Length 80mm

Ko-ken 3300FN-19 3/8 Sq. Dr. Socket 19mm Flare Nut Length 80mm

SKU: KK-3300FN-19
MPN: 3300FN-19

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Ko-ken 3300FN-22 3/8 Sq. Dr. Socket 22mm Flare Nut Length 80mm

Ko-ken 3300FN-22 3/8 Sq. Dr. Socket 22mm Flare Nut Length 80mm

SKU: KK-3300FN-22
MPN: 3300FN-22

Save $15.21
Ko-ken 3300FN-24 3/8 Sq. Dr. Socket 24mm Flare Nut Length 80mm

Ko-ken 3300FN-24 3/8 Sq. Dr. Socket 24mm Flare Nut Length 80mm

SKU: KK-3300FN-24
MPN: 3300FN-24

Save $15.74
Ko-ken 3300FN-8 3/8 Sq. Dr. Socket 8mm Flare Nut Length 53mm

Ko-ken 3300FN-8 3/8 Sq. Dr. Socket 8mm Flare Nut Length 53mm

SKU: KK-3300FN-8
MPN: 3300FN-8

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Ko-ken 3300FN-9 3/8 Sq. Dr. Socket 9mm Flare Nut Length 53mm

Ko-ken 3300FN-9 3/8 Sq. Dr. Socket 9mm Flare Nut Length 53mm

SKU: KK-3300FN-9
MPN: 3300FN-9

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Ko-ken RS3300FN/6 3/8 Sq. Dr. Socket set 8mm-19mm Flare Nut 150mm 6 pieces

Ko-ken RS3300FN/6 3/8 Sq. Dr. Socket set 8mm-19mm Flare Nut 150mm 6 pieces

SKU: KK-RS3300FN/6
MPN: RS3300FN/6

Save $69.03