Product Overview
Torrington NTA-613 Caged Thrust Needle Roller Bearing for 3/8 in Shafts
Condition
New and unused. Across all five photographs the steel reads bright and even, with no rust, pitting, or discoloration, and the needle rollers sit clean in their stamped cage windows with no flat spots or visible wear on the roller surfaces. The first photo shows the bearing lying on a kraft carton printed in heavy black type, partly readable as "...NGS" and "625". The photographs show the bearing bare for the camera; no individual retail packaging is shown or listed.
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Product Overview
Torrington NTA-613 is an axial needle roller bearing, also called a thrust needle roller bearing or needle thrust washer bearing, built for a 3/8 in shaft in alloy steel and made in the USA. The needles are held in a stamped steel cage, visible in every photo as a ring of rectangular windows between an inner and outer retaining lip, so the rollers stay square to the race and the whole stack sits barely thicker than a flat washer. It takes load along the shaft axis only. The original listing calls out Koyo NTA-613 and INA TC613 as potential replacements. Note that the outer diameter carried in the old listing does not match what the photographs show against the rules, so read the dimensions answer below before you design around it.
Key Features
- Part number: Torrington NTA-613, axial (thrust) needle roller bearing
- Cage: caged needle design, stamped steel retainer
- Shaft / bore diameter: 3/8 in
- Outer diameter: listed as 1 3/16 in, NOT confirmed. Against the millimeter caliper scale in photo 3 the outer race reads approximately 20 to 21 mm, roughly 13/16 in. Verify the OD before ordering.
- Construction: alloy steel
- Origin: Made in the USA
- Load direction: axial thrust only, not intended for side or radial load
- Cross reference candidates: Koyo NTA-613, INA TC613
- Condition: new, unused, 22 pieces on hand
Applications
- Robotics builder putting a steering pivot on a small vehicle, where the kingpin carries weight down the axis and needs to turn freely under it
- Machine shop hand backing up a lead screw or hand-crank thrust face on a light fixture, where a ball thrust stack would be too tall
- Restorer matching a Koyo NTA-613 or INA TC613 in older equipment and needing a same-series replacement rather than a substitution
- Prototyper building a rotary table or turntable on a 3/8 in shaft who needs low friction against an axial load in a thin space
Frequently Asked Questions
What outer diameter am I actually getting?
The old listing states 1 3/16 in, and we have left that claim in place rather than overwriting it. What we can tell you is what the photographs show: in photo 3 the bearing sits against a slide caliper with a legible millimeter scale and the outer race spans approximately 20 to 21 mm, which is roughly 13/16 in, and the steel rule laid alongside the bearing in photo 4 agrees with that smaller figure. In photo 5 the bearing sits oblique to the camera and away from the rule, so no reading can be taken there. The 3/8 in bore is consistent everywhere. Not confirmed - message us for a caliper reading before ordering if the OD is critical to your fit.
Can this bearing take side load?
No. An axial needle roller bearing carries force along the shaft axis and nothing else. The original listing is explicit about it: this is for a linear shaft that does not see much side force, and it is not recommended for anything like a direct drive wheel where radial load dominates. If your application pushes sideways, you want a radial bearing carrying that load separately.
Does it include thrust washers or hardened races?
The photographs show the caged bearing assembly on its own, and nothing else is listed as included. NTA-series thrust bearings are commonly run against separate hardened washers when the housing faces are not hard enough to serve as races. Not confirmed for this listing - plan on sourcing washers separately if your design needs them.
Will it drop in for a Koyo NTA-613 or an INA TC613?
The original listing names both as potential replacements, and they are the standard cross references for this series. We have not test-fit this piece against either brand, so treat them as candidates and check your dimensions and load rating against the manufacturer datasheet before committing.
Why buy two or three of these instead of a bagged lot of fifty?
Because a steering pivot needs two, a rotary test fixture needs one, and a bag of fifty needle thrust bearings is a lifetime supply of a part you may never use again. We have 22 on the shelf and you pick the number: one for a repair, a pair for a build, a few spares if you are going to be turning wrenches on the same machine for years. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Torrington built the NTA series to carry the push and not the shove, all inside a stack barely thicker than a flat washer. Set it on a clean 3/8 in shaft with a flat seat behind it, and whatever it holds up will turn like it is not carrying a thing.
