The Ko-Ken 4251A is an AF 12-point socket set with a 1/2 in square drive and 18 pieces. (manufacturer-stated) All 18 pieces are 12-point sockets (3/8 to 1-1/4 in AF). (manufacturer-stated) The set comes in a metal case measuring 330 x 68 x 48 mm (W x H x T). (manufacturer-stated) Set weight is 2,660 g. (manufacturer-stated) Where this product is used Nut and bolt work across a range of inch (AF) sizes with a 1/2 in drive ratchet or handle Workshop, vehicle and maintenance fastening Keeping the sockets together in one case Features 1/2 in square drive (manufacturer-stated) 18 pieces (manufacturer-stated) 12-point sockets (manufacturer-stated) Inch (AF) sizes (manufacturer-stated) Metal case (manufacturer-stated) 2,660 g set weight (manufacturer-stated) Key specifications Specification Detail Drive 1/2 in (manufacturer-stated) Pieces 18 (manufacturer-stated) Point type 12-point (manufacturer-stated) Sizes in set 3/8 to 1-1/4 in AF (manufacturer-stated) Case size (W x H x T) 330 x 68 x 48 mm (manufacturer-stated) Set weight 2,660 g (manufacturer-stated) Selecting the right option Choose the set that covers the sizes you work with and matches the 1/2 in square drive of your ratchet or handle. The catalogue prints the set weight but does not say whether it includes the case. The catalogue's safety notes say to select impact sockets only for electric or air impact wrenches and not to substitute hand sockets for impact sockets; this set is listed in the hand sockets section of the catalogue. (manufacturer-stated) Related products Related Ko-Ken products: Ko-Ken 4241A AF 12-Point Socket Set, 19 Pieces, 1/2 in Drive, Ko-Ken 4244A AF 12-Point Socket Set, 22 Pieces, 1/2 in Drive, Ko-Ken 4230A AF 12-Point Socket Set, 17 Pieces, 1/2 in Drive and Ko-Ken 4252A AF 12-Point Socket Set, 13 Pieces, 1/2 in Drive.
The Ko-Ken 4251A is an AF 12-point socket set with a 1/2 in square drive and 18 pieces. (manufacturer-stated) All 18 pieces are 12-point sockets (3/8 to 1-1/4 in AF). (manufacturer-stated) The set comes in a metal case measuring 330 x 68 x 48 mm (W x H x T). (manufacturer-stated) Set weight is 2,660 g. (manufacturer-stated) Where this product is used Nut and bolt work across a range of inch (AF) sizes with a 1/2 in drive ratchet or handle Workshop, vehicle and maintenance fastening Keeping the sockets together in one case Features 1/2 in square drive (manufacturer-stated) 18 pieces (manufacturer-stated) 12-point sockets (manufacturer-stated) Inch (AF) sizes (manufacturer-stated) Metal case (manufacturer-stated) 2,660 g set weight (manufacturer-stated) Key specifications Specification Detail Drive 1/2 in (manufacturer-stated) Pieces 18 (manufacturer-stated) Point type 12-point (manufacturer-stated) Sizes in set 3/8 to 1-1/4 in AF (manufacturer-stated) Case size (W x H x T) 330 x 68 x 48 mm (manufacturer-stated) Set weight 2,660 g (manufacturer-stated) Selecting the right option Choose the set that covers the sizes you work with and matches the 1/2 in square drive of your ratchet or handle. The catalogue prints the set weight but does not say whether it includes the case. The catalogue's safety notes say to select impact sockets only for electric or air impact wrenches and not to substitute hand sockets for impact sockets; this set is listed in the hand sockets section of the catalogue. (manufacturer-stated) Related products Related Ko-Ken products: Ko-Ken 4241A AF 12-Point Socket Set, 19 Pieces, 1/2 in Drive, Ko-Ken 4244A AF 12-Point Socket Set, 22 Pieces, 1/2 in Drive, Ko-Ken 4230A AF 12-Point Socket Set, 17 Pieces, 1/2 in Drive and Ko-Ken 4252A AF 12-Point Socket Set, 13 Pieces, 1/2 in Drive.
Ko-Ken 1/2" Drive Socket Set
The Ko-Ken 4251A is an AF 12-point socket set with a 1/2 in square drive and 18 pieces. (manufacturer-stated) All 18 pieces are 12-point sockets (3/8 to 1-1/4 in AF). (manufacturer-stated) The set comes in a metal case measuring 330 x 68 x 48 mm (W x H x T). (manufacturer-stated) Set weight is 2,660 g. (manufacturer-stated) Where this product is used Nut and bolt work across a range of inch (AF) sizes with a 1/2 in drive ratchet or handle Workshop, vehicle and maintenance fastening Keeping the sockets together in one case Features 1/2 in square drive (manufacturer-stated) 18 pieces (manufacturer-stated) 12-point sockets (manufacturer-stated) Inch (AF) sizes (manufacturer-stated) Metal case (manufacturer-stated) 2,660 g set weight (manufacturer-stated) Key specifications Specification Detail Drive 1/2 in (manufacturer-stated) Pieces 18 (manufacturer-stated) Point type 12-point (manufacturer-stated) Sizes in set 3/8 to 1-1/4 in AF (manufacturer-stated) Case size (W x H x T) 330 x 68 x 48 mm (manufacturer-stated) Set weight 2,660 g (manufacturer-stated) Selecting the right option Choose the set that covers the sizes you work with and matches the 1/2 in square drive of your ratchet or handle. The catalogue prints the set weight but does not say whether it includes the case. The catalogue's safety notes say to select impact sockets only for electric or air impact wrenches and not to substitute hand sockets for impact sockets; this set is listed in the hand sockets section of the catalogue. (manufacturer-stated) Related products Related Ko-Ken products: Ko-Ken 4241A AF 12-Point Socket Set, 19 Pieces, 1/2 in Drive, Ko-Ken 4244A AF 12-Point Socket Set, 22 Pieces, 1/2 in Drive, Ko-Ken 4230A AF 12-Point Socket Set, 17 Pieces, 1/2 in Drive and Ko-Ken 4252A AF 12-Point Socket Set, 13 Pieces, 1/2 in Drive.
The Ko-Ken 4251A is an AF 12-point socket set with a 1/2 in square drive and 18 pieces. (manufacturer-stated) All 18 pieces are 12-point sockets (3/8 to 1-1/4 in AF). (manufacturer-stated) The set comes in a metal case measuring 330 x 68 x 48 mm (W x H x T). (manufacturer-stated) Set weight is 2,660 g. (manufacturer-stated) Where this product is used Nut and bolt work across a range of inch (AF) sizes with a 1/2 in drive ratchet or handle Workshop, vehicle and maintenance fastening Keeping the sockets together in one case Features 1/2 in square drive (manufacturer-stated) 18 pieces (manufacturer-stated) 12-point sockets (manufacturer-stated) Inch (AF) sizes (manufacturer-stated) Metal case (manufacturer-stated) 2,660 g set weight (manufacturer-stated) Key specifications Specification Detail Drive 1/2 in (manufacturer-stated) Pieces 18 (manufacturer-stated) Point type 12-point (manufacturer-stated) Sizes in set 3/8 to 1-1/4 in AF (manufacturer-stated) Case size (W x H x T) 330 x 68 x 48 mm (manufacturer-stated) Set weight 2,660 g (manufacturer-stated) Selecting the right option Choose the set that covers the sizes you work with and matches the 1/2 in square drive of your ratchet or handle. The catalogue prints the set weight but does not say whether it includes the case. The catalogue's safety notes say to select impact sockets only for electric or air impact wrenches and not to substitute hand sockets for impact sockets; this set is listed in the hand sockets section of the catalogue. (manufacturer-stated) Related products Related Ko-Ken products: Ko-Ken 4241A AF 12-Point Socket Set, 19 Pieces, 1/2 in Drive, Ko-Ken 4244A AF 12-Point Socket Set, 22 Pieces, 1/2 in Drive, Ko-Ken 4230A AF 12-Point Socket Set, 17 Pieces, 1/2 in Drive and Ko-Ken 4252A AF 12-Point Socket Set, 13 Pieces, 1/2 in Drive.
in 6 offers
The lowest price for Ko-Ken 1/2" Drive Socket Set right now is $164.95 at housetradesupplies, compared across 6 retailers.
The all-time low was $159.95 on 31 Aug 2026 — today's price is 3% above the lowest ever. This is at or near its all-time low — a good time to buy.
Prices last updated 3 Nov 2026.
Last updated at 03/11/2026 01:41:33
Yamashita Industrial Research Laboratory Koken 4251A 1/2 (12.7 mm) SQ. Socket Set, 18 Pieces
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Koken 18PC 1/2"Dr 12PT 3/8"-1-1/4" AF Socket Set KO4251A
Delivery between 5–11 Nov $12.90
Ko-Ken 4251A AF 12-Point Socket Set, 18 Pieces, 1/2 in Drive
Delivery between 5–12 Nov $12.61
Koken 4251A 1/2′′ Square Drive Socket Set Standard 12 Point 18 Piece 3/8"-1-1/4" AF SAE - Made in Japan
Delivery between 4–13 Nov $17.95
Koken - Socket Set 1/2" Drive-12 Point 3/8-1 1/4af 18pcs | KO4251A
Delivery between 3–11 Nov $7.95
KOKEN 1/2inch Drive 3/8"-1-4" AF 12-Point Socket Set KO4251A
Free delivery between 9–12 Nov
| Included Tools | Sockets |
| Construction Material | Chrome |
| Power Source | Manual |
| Tool Type | Socket Set |
| Dimensions | W330xH68xT48mm (metal case) |
Yamashita Industrial Research Laboratory Koken 4251A 1/2 (12.7 mm) SQ. Socket Set, 18 Pieces
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Koken 18PC 1/2"Dr 12PT 3/8"-1-1/4" AF Socket Set KO4251A
Delivery between 5–11 Nov $12.90
Ko-Ken 4251A AF 12-Point Socket Set, 18 Pieces, 1/2 in Drive
Delivery between 5–12 Nov $12.61
Koken 4251A 1/2′′ Square Drive Socket Set Standard 12 Point 18 Piece 3/8"-1-1/4" AF SAE - Made in Japan
Delivery between 4–13 Nov $17.95
Koken - Socket Set 1/2" Drive-12 Point 3/8-1 1/4af 18pcs | KO4251A
Delivery between 3–11 Nov $7.95
| Included Tools | Sockets |
| Construction Material | Chrome |
| Power Source | Manual |
| Tool Type | Socket Set |
| Dimensions | W330xH68xT48mm (metal case) |
