Cummins NEW OEM 193838 Socket Head Cap Screw Allen Bolt Diesel Engine Truck 0810

Cummins Socket Head Cap Screw — Part Number 193838

Brand: Cummins | Condition: New Old Stock (NOS)

Genuine Cummins factory part number 193838, catalogued by Cummins as Socket Head Cap Screw — a hex socket drive capscrew, commonly called an Allen bolt. This is a legacy six-digit Cummins number, the older numbering format that survives on the big-bore engine families, and it is confirmed under that name in Cummins' own parts store. It is new old stock from long-term inventory, a genuine Cummins fastener rather than a hardware-store substitute.

Cummins assigns individual part numbers to its capscrews rather than treating them as generic hardware, and on a diesel that distinction is real. Engine fasteners are specified by grade and tensile strength, not just by thread and length, because they are torqued to a defined clamp load and many are torque-to-yield or sit in joints that see combustion pressure, vibration and thermal cycling. A hardware-store socket cap screw of identical thread and length may be a completely different grade, and it will either fail to hold clamp load or snap. The socket head itself is used specifically where there is no room to swing a wrench — which means these are exactly the fasteners you cannot easily substitute when one goes missing during a rebuild.

Condition Details

New old stock. The capscrew is unused and has never been installed or torqued. As with all warehouse-stored inventory, the packaging may show shelf wear, dust, fading, price stickers, scuffs or minor crushing from stacking; Cummins fasteners of this type are routinely supplied in plain bags rather than branded retail packaging. The screw itself has clean, undamaged threads, a sharp and unrounded hex socket, and its original factory finish with no corrosion or thread damage from storage. Please review all photos, as what is pictured is what you will receive.

Specifications

• Part Number: 193838
• Part Name: Socket Head Cap Screw (hex socket drive / Allen head capscrew)
• Manufacturer: Cummins
• Drive Type: internal hex socket
• Head Style: socket head cap
• Number Format: legacy six-digit Cummins part number
• Sold: see listing quantity
• Genuine OEM, not aftermarket

Thread size, length, grade, material and finish are not published in any catalogue data available for this number and are deliberately not stated here rather than guessed. Cummins' own store lists the part by name only, with no specification table. If you need these confirmed before you buy, message us and we will measure the actual screw — thread, pitch, length and hex socket size — and send you the figures.

Superseded & Cross Reference Part Numbers

• Cummins: 193838

No superseding number or aftermarket equivalent has been published for this part. Cummins reboxed many legacy six-digit parts under new seven-digit numbers over the years, so if your dealer has quoted you a longer number against 193838, message us and we will check the pairing before you order.

Features

• Genuine Cummins factory fastener, produced to the original grade, thread and dimensional specification
• Correct tensile grade for its joint — the property that determines whether the fastener holds its specified clamp load, and the one property you cannot see or measure in a parts bin
• Internal hex socket drive, used where there is no clearance to swing a wrench, which is precisely where a substitute fastener is hardest to find
• Clean, unmarked socket that takes a hex key fully without rounding — unlike a used screw that has already been torqued and backed off
• Factory finish for corrosion resistance in an engine bay environment
• Never installed or torqued, so it has not been stretched or work-hardened by a previous clamp cycle
• Direct fit, no modification required

Application

Used on Cummins diesel engines. The legacy six-digit Cummins numbering format is associated with the older big-bore engine families — NH and NT 855, N14, K19, KTA19, K38, KTA38, K50 and the V-series — where numbers in the 1xxxxx and 2xxxxx ranges remain in service. Comparable fasteners in the same range include capscrew 180261 and set screw 168306, the latter catalogued for KTA19, KTA38, KTA50 and NT855.

We are not going to guess at a model and year list. Cummins has not published fitment data for this number through any channel we can reach, and an invented application list on a graded fastener is how someone ends up with the wrong tensile grade in a torqued joint. Buyers should confirm 193838 against the parts diagram for their specific engine and build before ordering. If you have your engine serial number or your CPL, message us and we will check it against the Cummins catalogue for you — that is a free service and we would far rather do it than process a return.

Why Choose Cummins?

Cummins has built diesel engines since 1919 and has set the benchmark for heavy-duty engine durability and parts support worldwide. Genuine Cummins service parts are manufactured to the specification the engine was designed around and validated against the same standards as original production. On a fastener this comes down to one thing you cannot check with calipers: the grade. Thread and length are easy to match from a bin; tensile strength is not. A capscrew in a diesel is a calculated clamp load holding a joint together against combustion pressure and vibration, and the difference between the specified grade and a visually identical substitute shows up as a loosened joint or a snapped bolt, usually with the engine back together.

Returns

We accept returns through eBay's standard 30-day return request process. If the part is not what you need, simply open a return request through eBay within 30 days of delivery and we will take care of it.

Thank you for looking. We are a small parts business and we take real care in identifying, describing and packing every item we list. If anything about this part is unclear, or if you want additional photos or measurements before you buy, please message us — we would much rather answer a question up front than have you receive something that is not right for your machine.

If there is any problem at all with your order, please contact us first and give us the chance to make it right before leaving feedback. We respond quickly and we will resolve it.

QBS Parts, Inc — Gardena, CA