1-1/2″ Bore Light-Duty / Pneumatic Cylinder Tie Rod
Ø1/4″ rod × 1/4-28 UNF-2A threads each end, pre-dimensioned to NFPA T3.6.7 spec for 1-1/2″ bore light-duty hydraulic or pneumatic cylinders. Measure your old rod end-to-end and dial the total length in the configurator — everything else is filled in. NFPA Tables 25 and 40 dimensions — identical across light-duty hydraulic (≤500 PSI) and pneumatic (compressed air) cylinders.
Dimensions & defaults
| Cylinder duty | Light-duty hydraulic / Pneumatic |
|---|---|
| NFPA cylinder bore | 1-1/2″ |
| Tie-rod diameter | 1/4″ (0.25″) |
| Thread (each end) | 1/4-28 UNF-2A |
| Thread length (each end) | 1″ minimum (NFPA BB — extendable in configurator) |
| Default total rod length | 8″ = 1″ thread + 6″ unthreaded middle + 1″ thread (editable — measure your old rod; max 48″) |
| OD tolerance | ±0.005″ (tighter than NFPA §6.5, which permits ±0.015″ on two-decimal dimensions) |
| Default material | 1144 A311 CL-B Stressproof (configurable: 1045, 4140, 304, 316) |
| Source standard | ANSI/(NFPA) T3.6.7 R3-2009 (R2024) — Fluid Power Systems and Products, Square Head Industrial Cylinders, Mounting Dimensions |
Total rod length is the one number you change — measure your old rod end-to-end and type it in. Material, thread class (2A default, 3A available), thread form (UNF default, UNC and metric available), and per-end thread length all stay editable in the configurator. Default order quantity is 4 rods (the NFPA T3.6.7 cylinder uses four tie rods); single-rod orders are supported.
Frequently Asked Questions
The bore size alone doesn't tell you. A 4″ bore cylinder rated for 2500 PSI hydraulic service uses heavy-duty NFPA tie rods (5/8-18 threads, Ø5/8″ OD); a 4″ bore cylinder rated for 250 PSI light-duty hydraulic or compressed air uses the lighter tie rod (3/8-24 threads, Ø3/8″ OD). Check the cylinder nameplate or the OEM cut sheet for the duty rating, or just measure the old tie rod's thread and diameter and match it to the right group.
NFPA T3.6.7 publishes separate dimension tables for each (Tables 25 and 40), but every tie-rod dimension is identical between them. The standard treats them as one structural tier. Showing separate listings would be the same product at two URLs.
Lay the old rod on a bench and measure end-to-end with a tape, including the threaded portions. That number goes directly into the configurator. We don't ask for cylinder stroke or cushion depth — the OEM-specific dead-length math (Parker 2H ≠ Atlas H ≠ Sheffer H) is more error-prone than measuring the part in your hand.
Each bore card loads with a representative starter rod: 6″ smooth middle body plus the NFPA-spec thread length at each end. That keeps the 3D preview compact and shows the correct rod-end proportions before you've typed anything. Drop your measured total length into the configurator and the middle stretches to match — threads stay at NFPA minimum unless you bump them up. The configurator accepts anything up to 48″ total.
Total rod length up to 48″, OD up to 12″. Every NFPA T3.6.7 bore in this folder sits well inside both — the largest tie rod we offer is the heavy-duty 8″ bore (Ø1-1/4″ × up to 36″ length). If you need a longer rod than the default length suggests, just type your measured number in; the configurator accepts anything up to 48″.
Rod OD is ±0.005″, the industry-standard tie-rod OD spec. Threads default to UNF class 2A per NFPA §6.4 — the form used by every major US cylinder manufacturer; class 3A is available for high-vibration / precision-mounting applications. Both ends are chamfered for nut start and thread protection in shipping.
Yes. The default thread length per end is the NFPA BB extension dimension (visible thread past the cylinder cap). Buyers stacking cushion-bolt + double nut, adding jam/lock/safety nuts for vibration service, or wanting fudge room during reassembly often run thread length longer than NFPA minimum. Price scales per inch of additional thread.
Default is 1144 A311 CL-B Stressproof — 100 ksi tensile, the industry-default tie-rod alloy used by every major NFPA cylinder OEM (NFPA T3.6.7 itself only specifies dimensions, not material — but 1144 Stressproof is the de-facto choice). Currently RFQ-routed so a human quotes the partner price; orders complete normally. Toggles for 1045 cold-finished (budget), 4140 annealed (high-pressure / shock duty / mining and presses), 304 stainless (marine, food, washdown), and 316 stainless (chemical, offshore, coastal) all auto-price.
Not in this folder. Mill-duty cylinders use a separate NFPA standard (T3.6.9 / T3.6.13 territory), with bigger rods (1/2″–3″ diameter), longer lengths, and 8 rods per cylinder. Real money in steel-mill rebuilds, but a different product surface. Contact us if you need one.