Part number family
ASTM D1056
AMERICAN SOCIETY FOR TESTING AND · RUBBER SHEET,CELLULAR
One manufacturer designation, every identity it carries: 12 stock numbers, 38 variants in the maker's own range.
Codified — the stock numbers
The codification catalogue keys on the item of supply — each stock number opens the catalogue's own family, with approved sources and order of use.
Also on this specification — related, not interchangeable
Other designations qualified to the same line. A different size or class on one document is a NEIGHBOUR, not a substitute — ABS5093B25 (25 mm) and ABS5093B485 (485 mm) share a specification and are not swaps for each other. Each names the line that vouches for it.
Nothing else is published on these lines yet — coverage grows with each qualified-products cycle.
The maker's own variant family — different dimension
A different variant is not a substitute unless your specification allows it. Where a variant is qualified to a specification line, its family page holds the graded, cited view; "family only" means no qualification edge is recorded.
ASTM D 1056 — 38 variants · AMERICAN SOCIETY FOR TESTING AND · the full range →
ASTM D1056 MIL-STD-670 Type R Grade RO7 ASTM D1056-00 2C2EF1 family only ASTM D1056-00 family only ASTM D1056-00 GR2AF2K2 family only ASTM D1056-00 GR2C1F2 family only ASTM D 1056 GR 2A1 L family only ASTM D1056,TY 2,CL D,GR 2 family only ASTMD1056TY2CLAGR2A2 family only ASTM D 1056 GR 2A1 F2K2L family only ASTM D 1056 36IN family only ASTMD1056, 2C1L,0.310"X36"X36" family only ASTM D1056 RO15 family only ASTM D1056 SCE11F2 family only ASTM D 1056 TY 2 CL C GR 1 family only ASTM D1056-00 2B1C1 family only ASTM D1056 2C2 family only ASTMD1056SCE43 family only ASTM D 1056-91 GRADE 1A2 MIL-STD-670 Type R Grade RO7 ASTM D 1056-91 family only ASTM D 1056 GRADE 2C2 L family only ASTMD1056-00 2A2L family only ASTM D1056 91 GR2A2 L2 MIL-STD-670 Type R Grade RE3LZ ASTM D 1056-98 family only ASTM D 1056 91 GR 2C2 family only ASTMD1056-62T family only ASTMD1056TY1CLAGR2 family only ASTM D 1056 GR 2C2 A1F2 family only ASTM D1056-98 family only ASTM D1056-20 family only ASTM D1056 2D5 family onlyStaying inside the regulation — routes from candidate to approved
Codification and qualification say who vouches for a part — they are not installation eligibility. Under EASA Part-21, eligibility flows from the approved design (type design / IPC) or an approved change; under Part-145, acceptance needs an EASA Form 1 or, for genuine standard parts, conformity traceable to the officially recognised standard (145.A.42).
- Classify the part. Is it a GENUINE standard part? If the IPC/CMM references only a public specification (AN/MS/NAS/SAE-AS/ISO/EN) with no OEM source-control drawing, buy at source with conformity traceable to that standard.
- Check for an approved alternate. The IPC/CMM/vendor list may already carry an alternate part number or vendor code — an already-approved alternate needs no new approval.
- Ask the design approval holder. Request the source-control data, written equivalence, or addition of the alternative source to the approved data. Document a refusal.
- Raise a design change. Via a Part-21J DOA (or EASA/ADOA): a 21.A.95 minor change adding the alternate to the approved data, backed by an identicality/equivalence file — dimensions, material, class, load rating, lubricant/seal, corrosion protection, acceptance criteria. Critical applications escalate to major change/STC.
- FAA-PMA / BASA path. Where the product is also FAA-certificated: PMA parts reach EASA aircraft under the BASA/TIP (non-critical directly; critical via EASA-validated STC).
- Production, release, traceability. Approved parts are produced under a POA, released on an EASA Form 1 (marked EPA where applicable), with EN/AS 9120-grade traceability into Part-145/CAMO acceptance.
Stage 1(a): we assemble the equivalence/identicality starter file — the cited evidence this graph holds, shaped for your DOA or compliance department to take forward. See pricing.
Regulatory explainer, not legal advice: paragraph numbers, derogations and the BASA/TIP revision change — verify against the current consolidated Regulation (EU) 748/2012, the EASA Easy Access Rules and the current TIP, and engage your DOA and competent authority early.
This crosswalk identifies candidate equivalents with cited evidence. It is not an airworthiness approval. Substitution decisions remain subject to your organisation’s procurement and engineering approval process and the governing maintenance data (AMM/CMM/SRM/CML/OMAT).