Stainless Steel Plain Linear Bearing Pillow Blocks - Open Shell PNBS
Ways to Order
Plain linear bearing stainless steel pillow block, 1.5" ID with an open compensated running clearance for round shafts. The open bearing shell provides clearance for continuously supported shafts and support rails during linear travel. The straight-bore stainless steel housing contains an inserted open FL or FLC Simplicity® plain bearing with..
$1,063.80
Plain linear bearing stainless steel pillow block, open, 1.25" compensated ID with a running clearance of 0.0015" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$979.64
Plain linear bearing stainless steel pillow block, open, 1/2" compensated ID with a running clearance of 0.0015" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$375.17
Plain linear bearing stainless steel pillow block, open, 5/8" compensated ID with a running clearance of 0.0015" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$417.02
Plain linear bearing stainless steel pillow block, open, 3/4" compensated ID with a running clearance of 0.0015" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$586.62
Plain linear bearing stainless steel pillow block, open, 1" compensated ID with a running clearance of 0.0015" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$843.22
Plain linear bearing stainless steel pillow block, open, 2" compensated ID with a running clearance of 0.0015" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$1,214.65
Plain linear bearing stainless steel pillow block, open, 2" precision ID with a running clearance of 0.0005" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$1,214.65
Plain linear bearing stainless steel pillow block, open, 1.5" precision ID with a running clearance of 0.0005" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$1,063.80
Plain linear bearing stainless steel pillow block, open, 1" precision ID with a running clearance of 0.0005" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$843.22
Plain linear bearing stainless steel pillow block, open, 3/4" precision ID with a running clearance of 0.0005" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$586.62
Plain linear bearing stainless steel pillow block, open, 5/8" precision ID with a running clearance of 0.0005" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$417.02
Plain linear bearing stainless steel pillow block, open, 1/2" precision ID with a running clearance of 0.0005" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel Simplicity® plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$375.17
Stainless steel plain linear pillow block bearing, open, with a 1.25" precision ID and running clearance of 0.0005" per side. This non-self-aligning, mountable, standard-sized pillow block bearing uses a straight-bore stainless steel housing with an inserted open-shell stainless steel plain bearing. The self-lubricating FrelonJ® liner is FDA compliant for use..
$979.64
Open-shell stainless steel plain linear bearing pillow blocks are mountable linear bearing assemblies that use stainless steel housings with inserted stainless steel plain bearings for food and drug handling equipment, washdown applications, corrosive environments, and other machinery requiring corrosion-resistant, oil-free linear motion. The open bearing shell provides clearance for rail-supported shafts and round-profiled rails during linear travel. For closed-shell variants used with end-supported round shafts, look for the PBS part number.
PBC Linear PNBS open-shell stainless steel pillow blocks use straight-bore stainless steel housings with inserted open FL or FLC Simplicity® plain linear bearings. Each inserted bearing has a 316 stainless steel shell with a bonded, self-lubricating FrelonJ® liner rather than a liner bonded directly to the pillow block housing. The straight-bore design is non-self-aligning and is recommended for single-shaft applications where alignment is established by the machine structure.
FrelonJ® is supplied standard for operation with 300-series stainless steel and softer shafting such as aluminum. The liner provides oil-free, maintenance-free linear motion and is especially suited for washdown applications, corrosive environments, and non-contact food and drug handling equipment. It also performs in extreme temperatures, dirt, contamination, vibration, and shock loads. For applications involving potential direct food contact, go to Configure to choose the optional FDA-compliant FrelonW® liner.
Precision and compensated ID options are available. Precision bearings provide 0.0005" running clearance per side for a tighter fit, while compensated bearings provide 0.0015" per side for additional running clearance. PNBS open-shell stainless steel pillow blocks are available in inch sizes from 0.5" to 2" ID, with four pre-positioned mounting holes for standard-sized housing installation.
- PNBS open-shell stainless steel plain linear bearing pillow blocks
- Stainless steel housing with inserted Simplicity® stainless steel plain bearing
- Open-shell design provides clearance for rail-supported shafts and round-profiled rails
- For closed-shell variants used with end-supported round shafts, look for the PBS part number
- 316 stainless steel bearing shell with bonded, self-lubricating FrelonJ® liner
- FrelonJ® is especially suited for washdown and corrosive environments
- FrelonJ® is especially suited for non-contact food and drug handling equipment
- Optional FDA-compliant FrelonW® liner for direct food-contact applications
- Valuable in critical applications where downtime costs more than the bearing itself
- Four pre-positioned mounting holes for standard-sized housing installation
- Non-self-aligning straight-bore design recommended for single-shaft applications
- Precision and compensated ID options available
- Precision ID provides 0.0005" running clearance per side
- Compensated ID provides 0.0015" running clearance per side
- FrelonJ® provides oil-free, maintenance-free linear motion
- Use with 300-series stainless steel and softer shafting such as aluminum
- Operates in extreme temperatures, dirt, contamination, vibration, and shock loads
- Available in inch sizes from 0.5" to 2" ID
- Temperature rating: -400°F to +400°F (-240°C to +204°C)
Frequently Asked Questions
Why use a rail-supported shaft instead of an end-supported shaft?
A rail-supported shaft receives support along its length rather than only at its ends. This can reduce shaft deflection over longer spans or under higher loads, while an open-shell bearing provides the clearance needed to travel past the supporting structure.
Does the opening in an open-shell bearing reduce its load capacity?
Open-shell geometry changes how loads are carried through the bearing and housing compared with a closed-shell design. Load direction and the orientation of the opening should therefore be considered when sizing an open-shell linear bearing assembly.
Does the orientation of an open-shell pillow block matter?
Yes. The opening must align with the shaft support or round-profiled rail so the pillow block can travel without interference. Load direction should also be considered when determining the mounting orientation.
Can an open-shell pillow block travel the full length of a supported shaft?
Yes. The open-shell design allows the bearing to pass over the supporting structure beneath a rail-supported shaft, enabling linear travel along the supported portion of the shaft when the bearing, rail, and support geometry are properly matched.
Why are open-shell linear bearings useful for long travel distances?
Long shafts can deflect when supported only at their ends. Using a supported shaft or round-profiled rail provides support along the travel length, while an open-shell bearing allows the carriage to move past that support.
When is a plain linear bearing preferable to a ball bearing?
A plain linear bearing can be a better choice than a ball bearing in harsh operating conditions involving high vibration, high temperatures, heavy particulate contamination, dirt, or debris. Its self-lubricating sliding surface eliminates recirculating balls and can provide reliable linear motion where contamination, shock, or environmental conditions may reduce conventional ball bearing life.
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