Power Transmission Components
Power Transmission Components
Power transmission components are the bearings, roller chain, sprockets, bushings, seals, couplings and drives that carry rotation from motor to machine. Texas Belting stocks thousands of PT components in Houston, TX – 6,500+ bearings, ANSI chain and 9,300+ sprockets, QD and Taper-Lock bushings, oil seals, electric motors and gear reducers.
Shop power transmission by category
On this page: Chain by size · Bearings by type · QD vs Taper-Lock · Oil seals · Motors & reducers · Houston supplier · Common mistakes · FAQ
Browse roller chain and sprockets by size
ANSI chain numbers encode the pitch: the leading digits are the pitch in eighths of an inch, so #40 chain is 4/8 = 1/2 in pitch and #60 is 6/8 = 3/4 in. Every link below opens live inventory for that size – chain plus matching sprockets – with bore, tooth-count and brand filters alongside.
| Chain size | Pitch | Notes |
|---|---|---|
| #25, #35 | 1/4 in, 3/8 in | Rollerless bushing chain for compact, low-load drives |
| #40, #41, #50, #60 | 1/2 in, 1/2 in narrow, 5/8 in, 3/4 in | The general-purpose workhorse sizes; #41 is a lighter, narrower 1/2 in chain |
| #80, #100, #120, #140 | 1 in, 1-1/4 in, 1-1/2 in, 1-3/4 in | Heavy drives: conveyors, crushers, oil-field equipment |
| #160, #200, #240 | 2 in, 2-1/2 in, 3 in | The largest ANSI single-pitch sizes we stock |
| #2040, #2050, #2060, #2080 | 1 in, 1-1/4 in, 1-1/2 in, 2 in | Double-pitch conveyor chain – same pins and rollers as the base size, twice the pitch |
Pitches are ANSI standard dimensions (B29.1 single-pitch; B29.3/B29.4 double-pitch). Match pitch, roller width and strand count before ordering.
Browse bearings by type
Pick the bearing type from the load: pure radial, combined radial and thrust, misalignment, or tight radial space. Every link opens live filtered inventory with bore-size sliders. If you are working from a worn part, the number on the race usually decodes the type and bore – see the FAQ below.
| Type | Best for |
|---|---|
| Ball bearings and radial deep-groove | General-purpose radial load with moderate thrust; motors, fans, gearboxes |
| Double-row ball | Higher radial capacity in the same bore when axial space allows |
| Angular contact | Combined radial and one-direction thrust; spindles, pumps |
| Tapered roller | Heavy combined loads; axles, gear drives, wheel ends |
| Spherical roller | Heavy radial load plus shaft misalignment; vibrating screens, fans |
| Cylindrical roller | Very high radial load, free axial float; gearboxes, rolling equipment |
| Needle roller | High radial load where radial space is tight |
| Cam followers | Track rollers for cams, guides and conveying rails |
For housed units – pillow blocks, flange units, take-ups and stainless mounted bearings – start from the mounted bearings guide or jump straight to pillow block bearings.
QD vs Taper-Lock bushings
Most sheaves and sprockets mount through a tapered bushing system rather than a plain bore. QD bushings have a bolt flange and a split through both flange and barrel – tightening the cap screws draws the bushing into the hub taper. Taper-Lock bushings are flangeless and sit flush inside the hub for a cleaner profile. The two systems are not interchangeable: the hub is machined for one or the other. Match the bushing series stamped on the hub (SH, SDS, SK, E for QD; 1108, 2517, 3020 style numbers for Taper-Lock), then pick the bore.
Oil seals by shaft and bore size
An oil seal is specified by three dimensions: shaft diameter, housing bore, and width. Our oil seal size chart walks through measuring and cross-referencing part numbers, and the oil seal collection has inner-diameter sliders so you can narrow 2,800+ seals to your shaft size in one move. When a seal fails early, check the shaft for a groove worn at the lip line – a wear sleeve restores the sealing surface without machining.
Electric motors and speed reducers
We stock 2,100+ electric motors with live filters for horsepower, RPM, voltage, phase, frame and enclosure – plus worm and helical gear reducers to set output speed and torque. When replacing a motor, match the NEMA frame first: it fixes shaft height, shaft diameter and bolt pattern, so a same-frame motor drops onto the existing base. Then confirm HP, RPM, voltage and enclosure for the environment.
Power transmission supplier in Houston, TX
Texas Belting & Supply stocks bearings, chain, sprockets, bushings, seals and motors in Houston, and most stocked sizes ship same day. We serve plants, gins, mills and OEMs across the Texas Gulf Coast and ship nationwide. Send a parts list or a photo of the nameplate and we will quote the whole drive – call (888) 203-2358 to confirm availability.
Common power transmission mistakes
- Measuring chain by roller width instead of pitch. Pitch is pin-center to pin-center. Two chains with similar rollers can be different sizes entirely.
- Putting new chain on worn sprockets. Hooked, shark-finned teeth wear a new chain to match in weeks. Inspect sprockets at every chain change.
- Guessing bearing bore from the shaft's nominal size. Measure the bearing seat – worn seats and metric/inch lookalikes (25 mm vs 1 in) bite constantly.
- Mixing bushing systems. A Taper-Lock bushing will not seat in a QD hub or vice versa. Match the system and series stamped on the hub.
- Ordering seals by OD alone. Shaft diameter and width matter just as much – and a grooved shaft needs a wear sleeve or the new seal leaks on day one.
- Swapping motors across frames. Same HP does not mean same fit. The NEMA frame number controls shaft height, diameter and mounting.
When to call instead of browse
- The part number is gone – we identify bearings, seals and bushings from measurements daily.
- You are rebuilding a complete drive and want chain, sprockets, bushings and bearings matched as a package.
- You need multi-strand chain cut to length, or a motor cross-referenced from a dead nameplate.
Call (888) 203-2358 or send us what you have – measurements, photos or the machine model number.
Frequently asked questions
What do roller chain numbers like #40 and #60 mean?
The leading digits give the pitch in eighths of an inch: #40 is 4/8 = 1/2 in, #60 is 6/8 = 3/4 in, #120 is 12/8 = 1-1/2 in. A final 0 means standard roller chain, a final 5 means rollerless bushing chain like #25 and #35, and #41 is a narrow, lighter 1/2 in chain.
How do I measure roller chain size?
Measure the pitch – the distance from one pin center to the next – then the roller diameter and the inside width between link plates. Compare against ANSI dimensions, and count strands for multi-strand chain. A worn chain measures long: check pitch over 12 links, not one.
What is the difference between QD and Taper-Lock bushings?
QD bushings have a bolt flange and are split through flange and barrel; cap screws draw the bushing into the hub's taper. Taper-Lock bushings are flangeless and mount flush inside the hub. The hub is machined for one system only, so they never interchange – match what is stamped on the hub.
How do I read a bearing number like 6205-2RS?
The 6 marks a deep-groove ball bearing and 2 the dimension series. For bore codes of 04 and up, multiply the last two digits by 5 for the bore in millimeters – 05 means a 25 mm bore. 2RS means rubber seals on both sides; ZZ means metal shields.
When do I use a pillow block versus a flange bearing?
Use a pillow block when the shaft runs parallel to the mounting surface – it bolts down flat and carries the shaft above it. Use a flange unit when the shaft passes through a wall, plate or frame perpendicular to the mounting face. Both take the same insert-bearing principle with different housings.
What do I need to know to order an oil seal?
Three dimensions: shaft diameter, housing bore, and seal width – plus the lip style and material for the fluid and temperature. If the old seal's number is readable, we can cross-reference it directly; if the shaft shows a wear groove at the lip line, add a wear sleeve to the order.
Related products and guides
Need help matching a component?
Send measurements, photos or the machine model – we will identify bearings, chain, bushings and seals and quote the same day.
Request a Quote Call (888) 203-2358Last updated: July 2026