Ø5/8″ rod × 5/8-18 UNF-2A threads each end, pre-dimensioned to NFPA T3.6.7 spec for 3-1/4″ bore heavy-duty hydraulic cylinders. Measure your old rod end-to-end and dial the total length in the configurator. Everything else is filled in. NFPA Table 9 dimensions, for cylinders rated to higher operating pressures (industrial 1000–3000+ PSI hydraulic).
3-1/4″ Bore Tie Rod profile (configurator preview)
Dimensions & defaults
Cylinder duty
Heavy-duty hydraulic
NFPA cylinder bore
3-1/4″
Tie-rod diameter
5/8″ (0.625″)
Thread (each end)
5/8-18 UNF-2A
Thread length (each end)
2.31″ minimum (NFPA BB, extendable in configurator)
Default total rod length
10.62″ = 2.31″ thread + 6″ unthreaded middle + 2.31″ 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)
Material, tolerances, and features (mounting thread, retaining-ring groove, seat shoulder) stay editable in the configurator. The shaft and seat diameters, thread size and length, overall length, and groove dimensions are taken from the published catalog data; the axial split (seat-shoulder location, groove position) is reconstructed from the dimension table and confirmed against the catalog drawing or a sample before we cut, the drawing's title block stamps the source SKU so any deviation is visible to your buyer and to us.
By the part you are replacing. A piston is sized by the cylinder bore, and a plug by its thread. A rod gland or gland nut has two independent fits: the bore the rod slides through, set by your rod diameter, and the thread (or OD) that mounts into the cylinder head, set by the head — which follows the cylinder bore, not the rod. Pick the card that comes closest and the part loads into the configurator with its diameters, seal grooves, thread, and bore dimensioned. Measure your old part and the cylinder, then adjust any dimension; they are all editable and the rod and head fits move independently.
The seal grooves are cut to the SAE AS4716 gland design reproduced in the Machinery's Handbook O-ring tables. We pick the O-ring cross-section to suit the size: the 0.139" section for cylinder bores up to 2-1/2" and rods up to 1-1/2", and the 0.210" section for 3" bores. The groove width and radial depth come straight from those tables. Send us the seal you intend to use, or your seal chart, and we set the groove to it before cutting.
These rod glands are the screw-in style: an external thread on the gland OD threads into the cylinder head. The gland carries a rod seal and a wiper in the bore, where the rod slides through, plus a static O-ring groove on the OD that seals the gland to the head. If your cylinder uses a bolted flange gland instead, send us the bolt circle and we build that version.
Yes. The two fits are independent: the bore is set by your actual rod, and the mounting thread (or OD) is set by your cylinder head, which follows the bore. They do not have to match the standard rod-to-bore pairing — a heavy-service cylinder often runs a larger rod than the standard for its bore, and a repaired rod may be a hair under. Measure your rod and the head thread the gland screws into (or send the worn gland or nut), set both in the configurator, and we build to your numbers. The gland nut works the same way: its clearance bore follows the rod, its thread follows the head.
The cards default to 1018 cold-finished steel, the rebuild-part workhorse. Switch to 12L14 free-machining steel, 1045 for higher duty, or 303 / 304 stainless for washdown service in the configurator; 6061 aluminum is a good choice for light pneumatic pistons. If your original gland was a bearing bronze, tell us the cylinder and we will quote the right grade. Material certs (MTRs) are available on request.
Yes, that is what these are for. Set the bore, rod, thread, and seal grooves to your measured cylinder in the configurator, and we confirm the critical fits against your old part before cutting. Send a sketch or the worn part and we reverse-engineer the rest.
