China-made expansion anchor bolts list at US$0.20–1.50 per piece on a 1,000-piece minimum order at JiaXing Hongsteel Trading (Zhejiang, audited Diamond Member), with 60+ verified manufacturing entries live on Made-in-China's expansion-anchor category as of 2026-05-18 [S1]. The price spread is not noise — it tracks base material (carbon steel vs A2/A4 stainless vs nylon), the working-load class, and the certification dossier the buyer actually receives.
The English-language term is "expansion anchor" and the corresponding mechanical concept of radial 胀锚力 (expansion anchor-hold) is what the sleeve generates against the borehole wall once the bolt is torqued [S2]. The same Made-in-China category also lists drop-in, wedge, sleeve, and chemical-resin anchors as distinct sub-types, while consumer-grade drywall expansion nails ship in 50–240-piece retail kits on AliExpress at sub-US$1 promotional price points [S4]. Sourcing the wrong sub-type to a structural or vibration duty is the most common engineering failure mode in this category.
Anchor Families and What Each One Actually Does
Wedge anchors are the default structural pick for cracked and uncracked concrete: a clip expands against the hole wall as the nut is tightened, and they are typically specified where ICC-ES or equivalent seismic/ACI 355.2 evaluation reports back the load tables. Sleeve anchors cover the medium-duty, multi-material range — concrete, brick, block — and tolerate slightly oversized or irregular holes better than wedge designs. Drop-in (female) anchors are set with a setting tool and accept a threaded bolt or stud from the application side, which is why they dominate overhead MEP hangers and through-deck fastening where the anchor must sit flush before the bolt is engaged. Plastic expansion shells and nylon drywall anchors are the low-load end of the family, where the 胀锚力 comes from a split polymer sleeve deforming into the borehole [S2]; the 50–240-piece retail kits on AliExpress (US$0.99 promotional list, −90% off) are sized for this segment [S4].
For a chemical-anchor comparison point, the expansion-anchor reference page lays out the radial-expansion mechanism against the bonded-resin alternative; a useful adjacent read is the chemical-anchor page for the resin-anchored boundary, since the spec gate between mechanical and chemical is essentially vibration + edge-distance + cracked-concrete approval.
Load Classes, Base Material and the Numbers That Matter
Working-load banding is the first discriminator: light-duty plastic shells are rated to roughly 0.2–0.5 kN in 6–8 mm hole sizes, M6–M10 carbon-steel wedge anchors are typically rated 5–15 kN tension in C20/25 concrete, and M12–M20 A4-70 stainless wedge anchors reach 25–60 kN tension with the corresponding shear ratings. Sleeve anchors sit between those two bands. Reduction factors that change the published number are concrete strength (C20/25 vs C50/60), edge distance (typically ≥ 10 × anchor diameter for full tension capacity), and whether the design uses cracked-concrete (≈ 0.7×) or uncracked-concrete reduction. Pull-out and concrete-cone failure modes are checked separately from steel failure. [S1]
Material grade is the second gate. Zinc-plated carbon steel handles interior, dry service; hot-dip galvanizing (HDG, typically ≥ 50 µm per ISO 1461) extends to outdoor C3 atmospheres; A2/304 stainless covers wash-down food plants; A4/316 stainless is the default for chemical, marine, and tunnel atmospheres. The Made-in-China supplier list explicitly separates "zinc plated / HDG / stainless" finishes under the same wholesale category header, with price differentials driven by raw stainless and zinc-coating cost pass-through [S1].
Selection Criteria: Concrete, Brick, Hollow Block and Drywall
In solid concrete the call is wedge vs sleeve, decided by edge-distance, cracked-concrete approval, and whether the connection is structural or pipe-hanger-grade. In solid brick and clay tile, sleeve anchors and chemical-injection anchors outperform wedge designs because the radial expansion of a wedge tends to split the host. In hollow masonry and hollow block, only sleeve, plastic-shell, or chemical anchors make sense — a wedge anchor over-expands the hollow and loses preload. In drywall and plasterboard, the call is between a self-drilling metal anchor (the "expansion nail" kits at 50/100-piece count on AliExpress [S4]) and a plastic ribbed anchor; both are limited to light loads and should not be specified for overhead service.
For seismic, fatigue, or shock-loaded service, mechanical expansion anchors generally lose to through-bolt or chemical-anchor solutions because the radial preload relaxes under cyclic tension. A useful cross-reference is the expansion-joint page, which covers a different mechanism but is the natural pairing when the anchor must survive thermal cycling on a piping bridge. The pressure-transmitter reference matters where the anchor is supporting field-instrument bracketry on a process line — instrument-mount load classes and vibration spectra drive the anchor choice more than the instrument's intrinsic spec.
Sub-Type Comparison on Four Decision Criteria
Lining the four main sub-types against the same four criteria gives a structured comparison that procurement and design can act on. Cost per piece on a 1,000-piece MOQ is lowest for carbon-steel wedge anchors at the sub-US$0.50 end of the Made-in-China price band and highest for A4 stainless drop-in anchors at the US$1.50 ceiling [S1]. Working load in C20/25 concrete is highest for wedge (M12 carbon steel, ≈ 15 kN tension) and lowest for plastic-shell (≈ 0.3 kN in drywall/correspondingly low). Base-material compatibility is widest for sleeve (concrete, brick, block) and narrowest for plastic shell (drywall, aerated concrete only). Vibration and shock tolerance is best for chemical injection and through-bolts, and worst for plastic shell, with mechanical wedge and sleeve in between and dropping as preload relaxes.
That same matrix drives the rule of thumb that spec gates a US project: pick wedge for solid concrete and structural duty, sleeve for brick/block, drop-in for flush-mount overhead, plastic shell only for static light-load drywall. The neighbouring linear-guide and crossed-roller-guide pages share a similar "family vs working-condition" logic and are worth skimming if the anchor is being used to mount precision linear axes to a machine base.
Failure Modes, Standards and What a Cert Dossier Should Contain
Anchor failures fall into four families: concrete cone breakout (most common in shallow embedment), pull-out of the expansion sleeve (most common in soft or low-strength host material), steel fracture (most common at small edge distance combined with high tension), and splitting of the host (most common in brick and lightweight block). Each mode has a separate reduction in the design code; the wrong sub-type on the wrong host materially raises the probability of the failure mode the code did not check. The standard pin-up in the EU is the EAD/ETAG design language for concrete and masonry anchors; in the US, ICC-ES AC193 (concrete) and AC106 (masonry) evaluation reports are the working documents, and projects in chemical or offshore service additionally pull in NACE MR0175 for sour-service material restrictions on the bolt itself. [S2]
A cert dossier from the supplier should at minimum include: base-material test certificate (mill cert or 3.1), zinc-coating thickness or stainless grade statement, declared working and ultimate load at a stated concrete class and embedment depth, and either an ICC-ES report number or a CE/EAD reference. Wholesale listings that surface only the price and the photo — which is the common pattern on the Made-in-China category page where the description of each listing is sparse [S1] — should be treated as sourcing candidates, not as finished cert packs. Procurement should drive the spec into the RFQ rather than pulling the spec from the listing.
Where the Money Actually Moves in 2026 Sourcing
Three signals from the Made-in-China wholesale page stand out for 2026 sourcing: the live price band of US$0.20–1.50 per piece on a 1,000-piece MOQ [S1], the explicit finish-tier separation (zinc / HDG / stainless) under the same category header, and the volume of Diamond Member / Audited Supplier entries from Zhejiang, which is the dominant cluster for fastener exports out of China. The AliExpress channel is a separate benchmark — 50/240-piece retail kits at US$0.99 promotional pricing (−90% off) [S4] — that is useful only as a consumer-grade reference and should not be used for industrial capacity or cost comparison. The CENS (Taiwan) product index for the same category surfaces further OEM/ODM options for buyers who want a non-China-mainland alternate for spec diversification [S3].
For adjacent sourcing context, the cable and wire supply chain 2026 lead-times and pricing bands article covers the conductor-side pairing for any expansion-anchor-mounted conduit/cable-tray spec, and the titanium alloy suppliers 2026 grade map is a useful read for projects that push the bolt material up into higher alloys for corrosion service. Track two signals into 2026-Q3: the live price band on the Made-in-China category page and any change in the Zhejiang cluster's Audited Supplier count on the same category — both are the most direct demand thermometer for this family of fasteners.