101
Mechanical Drilling Jars
Series
386
458
342
338
454
344
359
459
Nominal Size
inches
4.75
6.25
6.50
6.75
7.00
8.00
9.00
9.50
(+API Drill Collar Tolerance)
(mm)
(121)
(159)
(165)
(171)
(178)
(203)
(229)
(241)
Max. Recommended Hole Diameter
inches
7 7/8
9 7/8
9 7/8
12 1/4
12 1/4
17 1/2
26
26
Hole openers not recommended.
(mm)
(200)
(251)
(251)
(311)
(311)
(445)
(660)
(660)
ID
inches
2.00
2.25
2.25
2.50
2.50
2.81
2.81
3.00
(mm)
(51)
(57)
(57)
(64)
(64)
(71)
(71)
(76)
Length (Latched)
feet
10.0
11.5
11.5
10.5
10.5
12.5
12.0
14.0
(m)
(3.0)
(3.5)
(3.5)
(3.2)
(3.2)
(3.8)
(3.7)
(4.3)
Weight
lbs
465
930
1,000
1,100
1,210
1,730
2,100
2,650
(kg)
(211)
(422)
(454)
(499)
(549)
(785)
(953)
(1 202)
Stroke Up (Free Stroke)
inches
4.00
4.75
4.75
4.75
4.75
5.00
5.00
6.00
(mm)
(102)
(121)
(121)
(121)
(121)
(127)
(127)
(152)
Stroke Down
inches
4.00
6.00
6.00
6.00
6.00
6.00
6.00
6.00
(mm)
(102)
(152)
(152)
(152)
(152)
(152)
(152)
(152)
Preset Release Up
STD.
lb
40,000
90,000
90,000
90,000
90,000
95,000
100,000
100,000
(Down = 45% of Up)
(kN)
(180)
(400)
(400)
(400)
(400)
(420)
(440)
(440)
MAX.
lb
55,000
140,000
140,000
140,000
140,000
150,000
155,000
155,000
(kN)
(240)
(620)
(620)
(620)
(620)
(670)
(690)
(690)
Maximum Tensile
lb
416,000
755,000
755,000
828,000
828,000
965,000
1,225,000
1,860,000
Load After Jarring
(kN)
(1 850)
(3 360)
(3 360)
(3 680)
(3 680)
(4 290)
(5 450)
(8 270)
Maximum Torsional Load
lb-ft
16,000
41,000
41,000
40,000
40,000
68,000
102,000
102,000
(To Yield Body Connections)
(Nm)
(22 000)
(56 000)
(56 000)
(54 000)
(54 000)
(92 000)
(138 000)
(138 000)
Pump Open Area
In2
6.0
9.6
9.6
11.0
11.0
14.2
15.9
15.9
(cm2)
(39)
(62)
(62)
(71)
(71)
(92)
(103)
(103)
To order: specify O.D., connections, bottom hole temperature.
Specifications subject to change without notice
GRIFFITH • VECTOR DRILLING JARS
All Griffith • Vector Drilling Jars (with the exception of slim hole 3 1/2”
O.D. and smaller) feature our Mechanical “Safety” latch mechanism.
The mechanical latch firmly holds the mandrel in the neutral position in
relation to the jar body, preventing any unexpected jarring while making
connections, tripping in or out of hole, or when tagging bottom. The
latch is preset to release when either a tensile or compressive force is
applied to the jar which exceeds the forces seen during normal drilling
operations.
The latch release settings can be adjusted at the service facility to
expand the range of jar placement possibilities within the drill string.
The latch mechanism allows the jar to run in the drilling string in tension
or compression or at the neutral point within the range of the preset
release settings. National Oilwell manufactures three types of Griffith •
Vector drilling jars, the Hydraulic Mechanical, the Double Acting
Hydraulic Mechanical and the Mechanical, all of which include the
mechanical “safety” latch mechanism.
Service and assembly shop
Manufacturing
GRIFFITH • VECTOR MECHANICAL JAR
The jar offers mechanical jarring in both directions. Latch release settings are variable. The jar is popular in higher temperature operations and in
remote areas where fully equipped service and repair facilities may be unavailable.
