Hook Blocks,
Hooks and Sheaves
29
31780
(14415)
88220
(40015)
26500
(12020)
93500
(42410)
21250
(9639)
98750
(44792)
15260
(6922)
20740
(9407)
Number of sheaves
11600
(5261)
Model
16400
(7438)
7920
(3592)
20080
(9108)
Weight,
lb. (kg)
Hood load capacity*
lb. (kg)
Width overall
in. (mm)
Line size,
in. (mm)
341/2
(876)
13/8, 11/2
38
(966)
11/2, 15/8
63
(1600)
201
(5105)
341/2
(876)
13/8, 11/2
63
(1600)
1911/2
(4864)
52
(1321)
1761/2
(4483)
29
(737)
11/8, 11/4
311/2
(800)
11/4, 13/8
47
(1194)
1581/8
(4016)
42
(1067)
1423/4
(3626)
261/2
(673)
11/8, 11/4
37
(940)
1297/8
(3299)
Max. dia. across
guard, in. (mm)
Length overall,
in. (mm)
6
B650GA500
7
B760GA650
650
(589)
60
(1524)
6
B660GA500
500
(453)
60
(1524)
500
(453)
50
(1270)
5
540G250
5
545G350
350
(317)
45
(1143)
250
(226)
40
(1016)
4
435G175
175
(158)
35
(889)
Load rating,
tons (tonnes)
Sheave O.D.,
in. (mm)
Model
HA500
HA650
8550
(3878)
650
(589)
6920
(3138)
500
(453)
HA350
5250
(2381)
350
(317)
Weight, lb. (kg)
Load rating,
tons (tonnes)
*This hood load capacity is the load which
may be placed on the hood in addition to the
weight of the block.
The rating which is cast into the hood is the
total rating. Higher capacity hoods may be
purchased for special applications. Various
design models may have different hood
capacities; always check with your National
Oilwell representative before heavy
applications are hung.
HOOKS
HOOK BLOCKS
SHEAVES
All National Oilwell sheaves feature our unique Bearing Retention
System, a simple but effective method of preventing a sheave from
“walking” off the bearing. The system consists of snap rings which
are inserted into grooves machined into the bore of the sheave, one
on each side of the bearing cup. A thinner version of a standard
seal completes the system.
• API #8C.
• DnV approved for UKDOE, NMD and NPD requirements.
• Fabricated from top quality materials.
• Full penetration welds at hubs.
• Rims compression fit to webs before welding.
• All welds fully inspected.
• Stress relieved after welding.
• Grooves hardened to Rockwell C35.
• National Oilwell bearing retention system.
• Three coat epoxy paint system.
• Common sizes stocked.
