Original SANY Inner Hexagon Socket Head Cap Screw 168899000012 Construction Machinery Parts

The genuine SANY parts reference 168899000012 is the Inner Hexagon Socket Head Cap Screw, a high‑strength fastener with a recessed hex drive, used for precision bolted joints in SANY heavy machinery. The 168899000012 socket head cap screw features a cylindrical head with a deep internal hex, allowing high torque transmission in confined spaces where external hex heads cannot fit.

Manufactured from alloy steel (grade 12.9) with a zinc‑nickel coating, this screw delivers exceptional tensile strength, fatigue resistance, and corrosion protection. Each 168899000012 unit is 100% inspected for thread form, head geometry, and hardness, guaranteeing reliable fastening in SRT dump trucks, SY excavators, SW wheel loaders, and motor graders.

Inner Hexagon Socket Head Cap Screw

Винт с внутренним шестигранником

Tornillo de cabeza cilíndrica con hexágono interior

Inner Hexagon Socket Head Cap Screw

Винт с внутренним шестигранником

Tornillo de cabeza cilíndrica con hexágono interior

Inner Hexagon Socket Head Cap Screw

Винт с внутренним шестигранником

Tornillo de cabeza cilíndrica con hexágono interior

Material and Design of Inner Hexagon Socket Head Cap Screw 168899000012

The socket head cap screw 168899000012 is cold‑formed from alloy steel (SCM435 or 42CrMo4) and heat‑treated to property class 12.9 per ISO 898-1. Minimum tensile strength is 1220 MPa, yield strength 1100 MPa, with hardness 39-44 HRC. The cylindrical head has a deep internal hex drive (6 mm across flats for M10 size) that accepts a standard hex key, allowing high tightening torque in recessed or confined spaces.

The thread is rolled (not cut) to improve fatigue strength and grain flow, meeting ISO 965-2 with tolerance 6g. The screw has a full thread (from near the head to the end) or partial thread depending on the application. The head has a small chamfer at the top and a fillet under the head to reduce stress concentration. The bearing surface is flat and smooth, providing uniform clamp load distribution.

Surface treatment is zinc‑nickel plating (8-12 µm) with a black trivalent passivation, providing 500 hours of salt spray resistance to red rust (ASTM B117). The coating also provides lubricity for consistent torque‑tension control. Each 168899000012 screw is laser‑marked with the strength grade “12.9” and a batch code on the top of the head for traceability.

All 168899000012 screws are 100% inspected: thread go/no‑go, head height, hex depth, and hardness. A sample from each lot is proof load tested (e.g., 120 kN for M12) and must withstand the load without permanent set. Magnetic particle inspection detects surface cracks. Full traceability is maintained from raw material to final packaging.

Critical Applications of Socket Head Screw 168899000012 in SANY Equipment

The socket head cap screw 168899000012 is used in applications requiring high clamp load and where external hex heads would interfere with adjacent components. Typical uses include hydraulic pump mounting bolts, cylinder head fasteners (on some engine models), motor flange attachments, and gearbox cover bolts. On SRT dump trucks, it secures the brake caliper to the knuckle. On SY excavators, it fastens the swing motor to the gearbox.

In SANY diesel engines (D07/D09/D12), 168899000012 screws are used for injection pump brackets, timing gear cover, and turbocharger mounting studs. The internal hex allows assembly in tight engine bays. The high grade (12.9) ensures long-term reliability under cyclic loads. Never substitute with a lower grade (8.8 or 10.9) – the joint may fail.

For engine rebuilds, always replace socket head cap screws that have been torqued beyond yield (e.g., cylinder head bolts). The zinc‑nickel coating prevents galvanic corrosion when used in aluminum housings. Always use genuine SANY screws for guaranteed strength and corrosion resistance.

Compatible SANY Models & Interchange Information

The socket head cap screw 168899000012 is used across SANY’s heavy equipment line: SRT45, SRT55, SRT95, SRT115 dump trucks; SY215 to SY500H excavators; SW305, SW405, SW465 wheel loaders; SMG200/220 graders; and STC crawler cranes. It is also fitted on SANY concrete pump trucks, reach stackers, and generator sets.

Common thread sizes for 168899000012 include M6, M8, M10, M12, and M16, with lengths from 16 mm to 120 mm. The part number as listed represents a specific thread and length (e.g., M10 x 1.5 x 40 mm). Always verify the original screw length, thread pitch, and head diameter. When ordering, specify 168899000012 to receive the correct grade 12.9, zinc‑nickel plated socket head cap screw.

For fleet maintenance, stock genuine 168899000012 screws. Aftermarket socket head screws often use grade 10.9 or 8.8 material or have poor heat treatment, leading to premature failure. Genuine SANY screws guarantee correct proof load, hex drive depth, and coating thickness.

Technical Specifications – Inner Hexagon Socket Head Cap Screw 168899000012

Proper Installation of Socket Head Cap Screw 168899000012

Before installing the screw 168899000012, clean the threaded hole and the bearing surface. Use a high‑quality hex key (6 mm for M10) that fits snugly – a worn key can strip the socket. Apply a light coat of clean engine oil to the threads unless the SANY manual specifies dry assembly. For critical joints, use a threadlocker (Loctite 243).

Thread the screw by hand until it contacts the joint surface, then use a calibrated torque wrench. Typical torque for grade 12.9 screws: M6: 12 Nm, M8: 30 Nm, M10: 60 Nm, M12: 110 Nm. Tighten in a cross pattern for multi‑screw joints. Do not exceed the recommended torque – over‑tightening can strip the internal hex or fracture the screw.

After torquing, mark the screw head and adjacent surface. Recheck torque after 100 operating hours for critical joints. If the screw has loosened, replace it with a new 168899000012 and re‑torque. Never reuse a screw that has been over‑torqued or shows any thread deformation. Store screws in a clean, dry environment.

Symptoms of a Damaged or Incorrect Socket Head Screw

A loose 168899000012 screw will cause rattling, joint movement, or fluid leaks. Over‑torqued screws may show a stripped hex socket (rounded corners) or a stretched shank (necking). A screw that has been tightened beyond yield may snap under normal load. If you feel the torque wrench “spinning” without increasing torque, stop immediately and replace the screw.

Corrosion (red rust) on the screw indicates coating failure – replace it. A screw with a damaged hex socket cannot be removed with a standard hex key; use a screw extractor. If the screw was cross‑threaded, it will not tighten properly and may damage the tapped hole. Always start the screw by hand to avoid cross‑threading.

During maintenance, inspect the screw head for wear, thread damage, or corrosion. If any damage is found, replace the screw. Use only genuine 168899000012 screws for replacement – never mix grades or types on the same joint.

Quality Assurance & Full Traceability for 168899000012

Every socket head cap screw 168899000012 is produced in an IATF 16949 certified facility. Production steps include wire rod analysis, cold heading, thread rolling, heat treatment (quench and temper), and zinc‑nickel coating. In‑process checks monitor hardness, thread dimensions, and hex socket depth using optical comparators.

Final inspection includes 100% optical sorting for head geometry, hex socket condition, and thread presence. A sample from each batch (5000 pieces) is proof load tested and must show no permanent set. Coating thickness is verified using XRF, and friction coefficient is measured on a torque‑tension tester. A laser‑etched batch code on the head provides traceability to material cert, heat treat batch, and coating line.

For bulk orders, SANY supplies a Certificate of Conformance (CoC) confirming that all 168899000012 screws meet ISO 898-1 class 12.9, ISO 4762 dimensions, and coating requirements. Independent third‑party audits ensure compliance with ISO 9001:2015 and IATF 16949. Use only genuine SANY screws for guaranteed performance.

Field Performance of Genuine SANY Socket Head Screw

Field data from SANY equipment operating in Australian mines and Canadian oil sands shows that genuine 168899000012 screws maintain clamp load for over 10,000 operating hours in high‑vibration environments. The 12.9 grade provides excellent fatigue resistance, and the zinc‑nickel coating withstands salt spray and humidity.

Aftermarket socket head screws often use grade 10.9 material or lack proper heat treatment, resulting in premature thread stripping or head failure. Genuine SANY screws exhibit consistent proof load and torque retention. Fleet owners report 90% fewer fastener failures after switching to genuine screws.

To maximize service life, always replace screws that have been removed from critical joints (e.g., engine internal). Use a torque wrench and a sharp hex key. Store screws in a dry cabinet. Following these practices ensures reliable fastening and eliminates fastener‑related downtime.