Rigmanufacturer

KELLY

KellyThe square and hexagonal Kelly is available up to 46 feet long. The Kelly is made from 4145H modified alloy bars that are quenched and tempered full length. A hardness range of 285 to 341 BHN and a minimum impact value of 40ft-lbs are maintained one inch below the surface at room temperature. All ends and center drive sections-trepanned to provide true bores. They are drifted to API specifications, and all connections are machined. The Kelly that we supply is stamped with the API monogram.

Size and Type of Square Kelly (in)


Kelly Size Length of Drive Section
m
Length Overall
m
Drive Section
Standard
L D
Opt.
L D
Standard
L
Opt.
L
Across Flats
D FL
Across
Corners
E C
Across
Corners
D CC
Radius
R C
Radius
R CC
Min. Wall E CC . Bore t
63.5 (2 1/2) 11280 12190 63.5 83.3 82.55 7.9 41.3 11.43
76.2 (3) 11280 12190 76.2 100.0 98.43 9.5 49.2 11.43
88.9 (3 1/2) 11280 12190 88.9 115.1 112.70 12.7 56.4 11.43
108.0 (4 1/4) 11280 15540 12190 16460 108.0 141.3 139.70 12.7 69.9 12.07
108.0 (4 1/4) 11280 15540 12190 16460 108.0 141.3 139.70 12.7 69.9 12.07
133.4 (5 1/4) 11280 15540 12190 16460 133.4 175.4 171.45 15.9 85.7 15.88
133.4 (5 1/4) 11280 15540 12190 16460 133.4 175.4 171.45 15.9 85.7 15.88
Kelly Size Upper Box Connection Lower Pin Connection Inside
Diameter d
size and style LH Outside Diameter Bevel Diameter Size and Style Outside
Diameter
D LR
Length
L L
Bevel Diameter
D F
Standard Opt. Standard
D U
Opt.
D U
L U D F D F
63.5 (2 1/2) (6 5/8) REG (4
1/2) REG
196.9 146.1 406.4 186.1 134.5 NC26
(23/8IF)
85.7 508 82.9 31.8
76.2 (3) (6 5/8) REG (4
1/2)REG
196.9 146.1 406.4 186.1 134.5 NC31
(27/8IF)
104.8 508 100.4 44.5
88.9 (3 1/2) (6 5/8) REG (4
1/2)REG
196.9 146.1 406.4 186.1 134.5 NC38
(31/2IF)
120.7 508 116.3 57.2
108.0 (4 1/4) (6 5/8) REG (4
1/2)REG
196.9 146.1 406.4 186.1 134.5 NC46
(4IF)
158.8 508 145.3 71.4
108.0 (4 1/4) (6 5/8) REG (4
1/2)REG
196.9 146.1 406.4 186.1 134.5 NC50
(41/2IF)
161.9 508 154.0 71.4
133.4 (5 1/4) (6 5/8) REG 196.9 406.4 186.1 5 1/2FH 177.8 508 170.7 82.6
133.4 (5 14) (6 5/8) REG 196.9 406.4 186.1 NC56 177.8 508 171.1 82.6

Size and Type of Hexagonal Kelly

Kelly Size Length of Drive Section
m
Length Overall
m
Drive Section
Standard LD Opt. LD Standard L Opt. L Across Flats D FL Across Corners E C Across Corners D CC CC Radius R CC Min. Wall E CC . Bore t
76.2 (3) 11280 12190 76.2 85.7 85.73 6.4 42.9 12.1
88.9 (3 1/2) 11280 12190 88.9 100.8 100.00 6.4 50.0 13.3
108.0 (4 1/4) 11280 15540 12190 16460 108.0 122.2 121.44 9.9 60.7 15.9
133.4 (5 1/4) 11280 15540 12190 16460 133.4 151.6 149.86 9.5 75.0 15.9
133.4 (5 1/4) 11280 15540 12190 16460 133.4 151.6 149.86 9.5 75.0 15.9
152.4 (6) 11280 15540 12190 16460 152.4 173.0 173.02 9.5 86.5 15.9
152.4 (6) 11280 15540 12190 16460 152.4 173.0 173.02 9.5 86.5 15.9
Kelly Size Upper Box Connection Lower Pin Connection Inside Diameter d
Size and style, LH Outside Diameter Bevel Diameter Size and style Outside Diameter D LR Length L L Bevel Diameter D F
Standard Opt. Standard DC Opt. DU Length L U Standard D F Opt. D F
76.2 (3) (6 5/8) REG (4 1/2) REG 196.9 146.1 406.4 186.1 134.5 NC26 (2 3/8IF) 85.7 508 82.9 31.8
88.9 (3 1/2) (6 5/8) REG (4 1/2) REG 196.9 146.1 406.4 186.1 134.5 NC31 (2 7/8IF) 104.8 508 100.4 44.5
108.0 (4 1/4) (6 5/8) REG (4 1/2)REG 196.9 146.1 406.4 186.1 134.5 NC38 (3 1/2IF) 120.7 508 116.3 57.2
133.4 (5 1/4) (6 5/8) REG   196.9   406.4 186.1   NC46 (4IF) 158.8 508 145.3 71.4
133.4 (5 1/4) (6 5/8) REG   196.9   406.4 186.1   NC50 (4 1/2IF) 161.9 508 154.0 71.4
152.4 (6) (6 5/8) REG   196.9 406.4 186.1 5 1/2FH 177.8 508 170.7 82.6
152.4 (6) (6 5/8) REG 196.9 406.4 186.1 NC56 177.8 508 171.1 82.6

Order Instructions:

  • Kelly type: Square or Hexagonal
  • Working space and overall length
  • upper and bottom connection size and type.
Kelly