JSB Jack Stuffing Box
The most compact stuffing box in the WSI line at just 7-½" height. No-bolt threaded cap with crown ring packing — designed specifically for short-stroke pumping units where minimal clearance between wellhead and carrier bar is critical.
Quick Specifications
BTM THREAD 2", 2-½", 3"
BOTTOM CONNECTION Male
CAP STYLE No-Bolt Threaded
HEIGHT 7-½"
MATERIAL Ductile Iron
PACKING TYPE. Crown Ring
ROD SIZES 1" – 1-½"
CROWN RINGS REQUIRED 5
Key Features
WHY THE JSB
Ultra Low Profile — 7-½"
The JSB is the shortest stuffing box in the WSI range at just 7-½" height — designed specifically for installations where clearance between the wellhead and carrier bar is severely limited.
2500 PSI Rating
At 2500 PSI, the JSB exceeds the standard 1500 PSI rating of most economy models — delivering higher pressure capability in the smallest available package.
No-Bolt Threaded Cap
Same no-bolt cap design as the Premier series. Ideal for high salt-water cut areas where corrosion attacks bolted glands. Even packing adjustment every time.
Short-Stroke Specialist
Fastest to Service
Crown Ring — Not Cone Packing
The JSB uses crown ring packing — not split-cone packing. Do not order standard cone packing for this model. Crown rings in Soft, Hard, and Silicone compounds available.
Full Specifications
BTM THREAD 2", 2-½", 3"
BOTTOM CONNECTION Male
CAP STYLE No-Bolt Threaded
HEIGHT 7-½"
MATERIAL Ductile Iron
PACKING TYPE. Crown Ring
ROD SIZES 1" – 1-½"
CROWN RINGS REQUIRED 5
Product Notes
- Ultra low profile at 7-½" — shortest stuffing box in the WSI line
- No-bolt threaded cap for fast service and corrosion resistance
- Crown ring packing — not split cone; specify rod size when ordering
- 2500 PSI working pressure — higher than standard economy stuffing boxes
- Ideal for short-stroke pumping units with minimal carrier bar clearance
- Rod sizes 1" through 1-½" (max 1-½" — does not accommodate 1-¾" rods)
Packing Options
Select the packing compound best suited for your well fluid chemistry, temperature, and operating conditions.
SOFT
SBR
HARD
SBR
SB SILICONE
Compatible Accessories
WSI accessories that install directly on the JSB.
Polished Rod Lubricator
1 quart reservoir reduces friction heat between polished rod and packing — extending packing life significantly. Especially important for wells on timer controls.
Carrier Bar Leveling Plate
Compensates for carrier bar misalignment up to 2°. Installs under the stuffing box or clamp. Minimizes polished rod breaks from lateral stress — especially important on compact short-stroke installations.
Rod Stack-Out Tool
Rated to 50,000 lbs. Available for Economy double pack and BS Premier style stuffing boxes. Contact factory for compatibility with JSB configuration.
Related Stuffing Boxes
Other WSI stuffing box models that may better suit your pressure requirements, well conditions, or installation constraints.
WSB Wheel Stuffing Box
2500 PSI
BSSP Premier Single Pack
1500 PSI
SPSB Economy Single Pack
1500 PSI
